This document presents a numerical simulation of flow and pressure rise in a ducted axial fan. It develops equations to model three-dimensional and one-dimensional flow. MATLAB code is used to implement Simpson's 1/3rd rule for numerical integration of the equations. The code computes pressure rise values for varying fan parameters like inlet velocity, whirl velocity, rotor speed, and blade diameter. The simulation aims to optimize pressure rise in the ducted axial fan.
Modeling and simulation of ducted axial fan for one dimensional flowiaemedu
The document summarizes research on modeling and simulating a ducted axial fan for one-dimensional flow. It presents the governing continuity, momentum, and energy equations. It then derives the radial equilibrium concept for axial flow, showing that pressure change is proportional to the square of whirl velocity over radius. The paper describes a ducted axial fan test rig and instrumentation. It aims to compute pressure rise by varying parameters like inlet velocity, whirl velocity, rotor speed, and blade diameter using Simulink.
Modeling and simulation of ducted axial fan for one dimensional flow no restr...iaemedu
This document describes modeling and simulation of a ducted axial fan for one-dimensional flow. It presents the governing continuity, momentum and energy equations. It derives the flow model using radial equilibrium concepts to compute pressure rise as a function of whirl velocity, rotor speed and blade diameter. A Simulink model is developed using typical blocks to simulate the one-dimensional flow model. Results show that maximum pressure rise occurs at higher rotor speeds, pressure ratios and larger blade diameters. Flow modeling and simulation helps optimize pressure rise for different operating parameters of the ducted axial fan.
Analysis of Material Discharge Rate of Pneumatic Conveying System using Genet...Yassin Alkassar
This document discusses using genetic algorithms to optimize parameters in a pneumatic conveying system. A pneumatic conveying system uses compressed air to transfer materials through pipes. The researcher developed an experimental setup and used genetic algorithms to optimize four parameters: blower speed, venturi feeder, rotary valve, and bend angles. Regression analysis was performed to develop an equation to predict material discharge rates based on these parameters. The genetic algorithm and regression equation can identify optimal parameter conditions for maximum material transfer efficiency and cost effectiveness in pneumatic conveying systems.
IRJET- A Review on Design Analysis and Optimization of Centrifugal BlowerIRJET Journal
This document reviews the design, analysis, and optimization of centrifugal blowers. It discusses how computational fluid dynamics (CFD) can be used to optimize blower design parameters like impeller dimensions and blade angles. The document outlines a 4-phase design process: (1) selecting a blower type, (2) parametric studies to determine key design factors, (3) CFD analysis to improve pressure and efficiency, and (4) design of experiments to further optimize the housing design. CFD and experiments show designs with larger impellers increase flow rate and pressure but decrease efficiency. Blade and tip clearances also impact performance.
The document summarizes a study on developing an active control system for pantographs on high-speed railway vehicles. It discusses:
1) Issues with current collection stability at high speeds due to contact force variation from vertical body vibration and contact wire irregularities.
2) A model is developed using multi-body dynamics to simulate the flexible contact wire and pantograph interaction.
3) An active control approach is proposed that applies a cancellation force based on the vertical body vibration input to minimize variation in the contact force between the pantograph and overhead wire. Transfer functions are derived and used to design a controller to provide the cancellation force.
Analysis and simulation of rayleigh fading channel in digital communicationeSAT Journals
This document analyzes and simulates Rayleigh fading channels for digital communication systems using various modulation techniques. It begins by introducing Rayleigh fading channels and describing how they are modeled. It then analyzes the probability of bit error for digital modulation schemes like BPSK, QPSK, MPSK, and MQAM in Rayleigh fading channels. MATLAB simulations are used to plot constellations and signal power for M-QAM modulation. The document also analyzes the Joint Tactical Information Distribution System (JTIDS) and simulates its performance over Rayleigh fading channels. It concludes by discussing the results and potential for future work analyzing additional modulation techniques.
Model predictive-fuzzy-control-of-air-ratio-for-automotive-enginespace130557
Automotive engine air-ratio plays an important role of
emissions and fuel consumption reduction while maintains
satisfactory engine power among all of the engine control variables.
This document summarizes multi-objective optimization of a Tricept parallel manipulator using an evolutionary algorithm. It discusses using a particle swarm optimization (PSO) technique to optimize the manipulator's conditioning index, workspace volume, and global conditioning index (GCI) simultaneously. The methodology involves calculating inverse kinematics and the Jacobian to determine performance parameters. Single-objective PSO is used to optimize the conditioning index alone. Results show the minimum conditioning index and corresponding design variables. PSO also optimizes the workspace volume alone. A multi-objective PSO with a weighted sum strategy then optimizes all parameters simultaneously, showing their relationships and validating results against single-objective optimization.
Modeling and simulation of ducted axial fan for one dimensional flowiaemedu
The document summarizes research on modeling and simulating a ducted axial fan for one-dimensional flow. It presents the governing continuity, momentum, and energy equations. It then derives the radial equilibrium concept for axial flow, showing that pressure change is proportional to the square of whirl velocity over radius. The paper describes a ducted axial fan test rig and instrumentation. It aims to compute pressure rise by varying parameters like inlet velocity, whirl velocity, rotor speed, and blade diameter using Simulink.
Modeling and simulation of ducted axial fan for one dimensional flow no restr...iaemedu
This document describes modeling and simulation of a ducted axial fan for one-dimensional flow. It presents the governing continuity, momentum and energy equations. It derives the flow model using radial equilibrium concepts to compute pressure rise as a function of whirl velocity, rotor speed and blade diameter. A Simulink model is developed using typical blocks to simulate the one-dimensional flow model. Results show that maximum pressure rise occurs at higher rotor speeds, pressure ratios and larger blade diameters. Flow modeling and simulation helps optimize pressure rise for different operating parameters of the ducted axial fan.
Analysis of Material Discharge Rate of Pneumatic Conveying System using Genet...Yassin Alkassar
This document discusses using genetic algorithms to optimize parameters in a pneumatic conveying system. A pneumatic conveying system uses compressed air to transfer materials through pipes. The researcher developed an experimental setup and used genetic algorithms to optimize four parameters: blower speed, venturi feeder, rotary valve, and bend angles. Regression analysis was performed to develop an equation to predict material discharge rates based on these parameters. The genetic algorithm and regression equation can identify optimal parameter conditions for maximum material transfer efficiency and cost effectiveness in pneumatic conveying systems.
IRJET- A Review on Design Analysis and Optimization of Centrifugal BlowerIRJET Journal
This document reviews the design, analysis, and optimization of centrifugal blowers. It discusses how computational fluid dynamics (CFD) can be used to optimize blower design parameters like impeller dimensions and blade angles. The document outlines a 4-phase design process: (1) selecting a blower type, (2) parametric studies to determine key design factors, (3) CFD analysis to improve pressure and efficiency, and (4) design of experiments to further optimize the housing design. CFD and experiments show designs with larger impellers increase flow rate and pressure but decrease efficiency. Blade and tip clearances also impact performance.
The document summarizes a study on developing an active control system for pantographs on high-speed railway vehicles. It discusses:
1) Issues with current collection stability at high speeds due to contact force variation from vertical body vibration and contact wire irregularities.
2) A model is developed using multi-body dynamics to simulate the flexible contact wire and pantograph interaction.
3) An active control approach is proposed that applies a cancellation force based on the vertical body vibration input to minimize variation in the contact force between the pantograph and overhead wire. Transfer functions are derived and used to design a controller to provide the cancellation force.
Analysis and simulation of rayleigh fading channel in digital communicationeSAT Journals
This document analyzes and simulates Rayleigh fading channels for digital communication systems using various modulation techniques. It begins by introducing Rayleigh fading channels and describing how they are modeled. It then analyzes the probability of bit error for digital modulation schemes like BPSK, QPSK, MPSK, and MQAM in Rayleigh fading channels. MATLAB simulations are used to plot constellations and signal power for M-QAM modulation. The document also analyzes the Joint Tactical Information Distribution System (JTIDS) and simulates its performance over Rayleigh fading channels. It concludes by discussing the results and potential for future work analyzing additional modulation techniques.
Model predictive-fuzzy-control-of-air-ratio-for-automotive-enginespace130557
Automotive engine air-ratio plays an important role of
emissions and fuel consumption reduction while maintains
satisfactory engine power among all of the engine control variables.
This document summarizes multi-objective optimization of a Tricept parallel manipulator using an evolutionary algorithm. It discusses using a particle swarm optimization (PSO) technique to optimize the manipulator's conditioning index, workspace volume, and global conditioning index (GCI) simultaneously. The methodology involves calculating inverse kinematics and the Jacobian to determine performance parameters. Single-objective PSO is used to optimize the conditioning index alone. Results show the minimum conditioning index and corresponding design variables. PSO also optimizes the workspace volume alone. A multi-objective PSO with a weighted sum strategy then optimizes all parameters simultaneously, showing their relationships and validating results against single-objective optimization.
Performance prediction of a turboshaft engine by using of one dimensional ana...ijmech
Performance estimation of the axial flow gas turbines under variety of operating conditions like different speeds and pressure ratios has been hampered by lack of reliable experimental data and experiments cost.Simulation of gas turbine is a simple way to reduce testing costs and complexity.One-dimensional (1D).Simulation is a simple, fast and accurate method for performance prediction of turbine with different geometries. In this approach, inlet flow conditions and turbine geometry are known and by considering loss model, the turbine performance characteristics are predicted. In following work, that is based on one dimensional modelling method, after the presentation of solution algorithm by trial and error method and introduction of different loss models for modelling, this method were examined for a turbo shaft engine and
compared with experimental results. Comparison of the results with experimental data shows so good adaptation. Also according to these results, Kacker and Okapuu’s developed model gave the closest results to the reference data.
Analytical Evaluation of Generalized Predictive Control Algorithms Using a Fu...inventy
Research Inventy : International Journal of Engineering and Science is published by the group of young academic and industrial researchers with 12 Issues per year. It is an online as well as print version open access journal that provides rapid publication (monthly) of articles in all areas of the subject such as: civil, mechanical, chemical, electronic and computer engineering as well as production and information technology. The Journal welcomes the submission of manuscripts that meet the general criteria of significance and scientific excellence. Papers will be published by rapid process within 20 days after acceptance and peer review process takes only 7 days. All articles published in Research Inventy will be peer-reviewed.
Formulation of data based ann model for human powered oil pressIAEME Publication
This document describes the formulation of an artificial neural network (ANN) model for a human-powered oil press. The researchers conducted experiments to collect data on the oil press's input and output parameters. They developed mathematical models to relate the parameters but also created an ANN model to better handle the complex, nonlinear relationships. The ANN was trained on the experimental data and can now predict the output values corresponding to given input values, providing a "best fit" model for the oil press system. The ANN model allows entrepreneurs to select optimal input combinations to maximize oil extraction and minimize torque/velocity, improving productivity.
The document describes an experiment on flow system control using a PID controller. The objectives are to obtain the system characteristics like overshoot, rise time, settling time, period, and transport delay. It introduces PID controllers and how they work in a closed loop system using proportional, integral, and derivative modes. The apparatus section outlines the experimental setup, which uses a flow system with a square wave input and adjustable setpoint and proportional gain. Calculations are shown for analyzing the system response based on these parameters.
This document summarizes an optimization study to maximize the power output of a ducted vertical axis wind turbine. The study uses computational fluid dynamics (CFD) simulations coupled with a genetic algorithm to optimize the geometry of the duct surrounding the turbine. The duct geometry is defined by 7 curvature points and optimized at 3 positions relative to the turbine center. The optimized duct configuration resulted in a 20° convergence angle with the throat at the turbine center. This optimized duct increased the tip speed ratio and power coefficient at maximum power output and decreased the torque ripple factor compared to an un-ducted turbine.
Comparitive analysis of doa and beamforming algorithms for smart antenna systemseSAT Journals
Abstract This paper revolves around the implementation of Direction of arrival and Adaptive beam-forming algorithms for Smart Antenna Systems. This paper also investigates the implementation of algorithms on various planner array geometries viz. circular and rectangular. Music algorithm is primarily finds the possible location of desired user and adaptive beam-forming algorithms such as LMS, RLS and CMA algorithms adapts the weights of the array. DOA estimation gives the maximum peak of spectrum with respect to angle of arrival where the desired user is supposed to exist. After DOA estimation weights of array antenna are changed with the changing received signal. This methodology is called as Spectral estimation, which allows the antenna pattern to steer in desired direction estimated by DOA and simultaneously null out the interfering signals. Rate of convergence is the major criterion for comparison for adaptive beam-forming algorithms. Keywords: DOA, MUSIC, LMS, RLS, CMA, SAS.
Development of Mathematical Model for Vacuum Damped Recoil SystemIRJET Journal
This document presents a mathematical model for analyzing the behavior of a vacuum damped recoil system. It begins by describing the components of an experimental vacuum damped recoil system model, including a pneumatic cylinder, vacuum gauge, barrel, load cell, and indicator. It then identifies the key variables that define the system: recoil time, force, recoil length, vacuum pressure, cylinder diameter, and barrel weight. Using Buckingham's theorem of dimensional analysis, the document develops equations to calculate recoil time and force as functions of the other variables. Constant values k1 and k2 are determined from experimental data and applied to the equations. The mathematical model allows prediction of recoil time and force based on the system's vacuum pressure
OPTIMIZATION OF COST 231 MODEL FOR 3G WIRELESS COMMUNICATION SIGNAL IN SUBURB...Onyebuchi nosiri
This document describes the optimization of the Cost 231 model for 3G wireless communication signals in a suburban area of Port Harcourt, Nigeria. Field measurements were taken using drive testing equipment. The least squares algorithm was used to optimize parameters in the Cost 231 model based on the measured data. This reduced the mean absolute deviation from 1.196 to 1.179 and the mean squared deviation from 2.01 to 1.94, showing better prediction accuracy of the optimized model compared to the original Cost 231 model for the environment.
An improved tabular technique for presenting the variousAlexander Decker
This document presents an improved tabular technique for showing the algorithms to find initial basic feasible solutions to transportation problems using the Northwest Corner method, Least Cost method, and Vogel Approximation method. The technique uses a single comprehensive table with additional rows and columns ("stages") to sequentially display each step of the algorithms. The document illustrates the technique using a sample transportation problem, presenting the solution processes through stages in multiple tables. It aims to provide a clearer presentation method than previous techniques using multiple separate tables.
Optimization of design of mixed flow centrifugal pump impeller using cfdeSAT Journals
Abstract
Centrifugal pumps are widely used hydraulic machines, irrespective of the fact that their performance is generally not very good. So, turning them into more efficient machines is quite a challenge. The performance of a centrifugal pump is highly dependent on its geometrical parameters and its vane profile. In order to analyze the flow through complex systems like centrifugal pumps, Computation fluid dynamics (CFD) has been used. This work aims to study the performance analysis of a centrifugal mixed flow pump designed to deliver 0.25 m3/s of water with a head of 20 m at a speed of 1450 rpm using ANSYS CFX (ver.14.0). PTC Creo (ver. 2.0) has been used to model the pump unit. The performance of the pump was first determined using the existing vane angles and thickness of the blade then, the inlet vane angle, the outlet vane angle along with the thickness of the blade has been varied to analyze the pump’s performance . The results show that for an initial inlet angle 21.08˚, outlet angle 16.28˚ and blade thickness as 10mm, the efficiency of the pump was 84%. However, the efficiency of pump rises to 89.19% for the optimized angles and blade thickness.
Adaptive pi based on direct synthesis nishantNishant Parikh
This document describes an adaptive proportional-integral (PI) controller for a laboratory level control system. The system consists of two interconnected tanks where the level of the second tank is controlled. Due to changes in plant dynamics over time, an adaptive controller is used. The plant parameters are estimated online using recursive least squares estimation based on input and output signals. The estimated parameters are then used to calculate PI controller parameters to achieve the desired closed-loop response. Experimental results show the controller can maintain level control even after changes in plant dynamics without needing re-calibration.
AIROPT: A Multi-Objective Evolutionary Algorithm based Aerodynamic Shape Opti...Abhishek Jain
Above Research Paper can be downloaded from www.zeusnumerix.com
The paper aims to optimize an airfoil shape for minimum drag and maximum lift to drag ratio. Multi-objective evolutionary algorithm based modular optimization framework is used for shape optimization. The airfoil geometry has been parametrized using Bézier curves for generating the camber and thickness surfaces. XFOIL has been used to estimate the pressure and boundary layer edge velocity distributions. Pareto plots for objectives are shown for both the objectives. Authors - Sandeep S (Zeus Numerix), S Rangasamy (T Cube), S Raghunath (Univ of Queensland)
This document discusses various aerodynamic models used to predict the performance of straight-bladed vertical axis wind turbines (VAWTs). It first describes momentum models, including the rotor blade model and single streamtube model. The rotor blade model calculates forces on blade sections, while the streamtube model represents the turbine as an actuator disk. It then introduces the double-multiple streamtube model which divides the swept volume into streamtubes and calculates upstream and downstream induced velocities. The document also discusses experimental wind tunnel tests using laser Doppler velocimetry and pressure sensors on turbine blades to measure velocities and pressures and validate the momentum model calculations.
Multi objective-optimization-with-fuzzy-based-ranking-for-tcsc-supplementary-...Cemal Ardil
This document summarizes a research paper that investigates using multi-objective optimization and genetic algorithms to design a thyristor controlled series compensator (TCSC) controller to improve both rotor angle stability and voltage stability in a power system. The researchers formulate the controller design as a multi-objective optimization problem with the objectives of improving oscillatory stability and voltage profile. A genetic algorithm is used to generate a Pareto set of optimal solutions. A fuzzy-based method is then employed to select the best compromise solution from the Pareto set. Simulation results demonstrate the effectiveness of the proposed approach.
Time domain sound spectrum measurements in ducted axial fan under stable regi...iaemedu
This document summarizes research on measuring time domain sound spectra in a ducted axial fan under stable operating conditions. The fan test setup and instrumentation are described, including a microphone to capture sound signals, data acquisition system, and LabVIEW software to analyze spectra. Experiments were conducted at varying rotor speeds from 2400-3600 rpm with a throttle position of 6 cm. Results showed that sound pressure amplitude generally increased with rotor speed and fluctuated periodically, with maximum amplitudes ranging from 16-36 dB depending on speed. The time domain spectra provide insights into fan acoustics and stability characteristics under different operating conditions.
This document describes the design and construction of a one-man powered hang glider. It consists of a lightweight trike frame, wings made of fabric stretched over an aluminum skeleton, and a 125cc rear-mounted engine. The total cost to build the hang glider was Rs. 46,952 (approximately $650). Pictures show the various construction steps, including fabricating the trike frame, assembling the wing skeleton, attaching the wings, and test flights of the completed aircraft.
1. The document discusses nanotechnology and its applications in food science and nutrition.
2. It provides background on nanotechnology, including definitions, a brief history, and examples of nano-sized particles commonly found in foods.
3. The document also describes potential applications of nanotechnology in food processing, packaging, and safety, such as using nanosensors to detect pathogens and nanomaterials to enhance flavors or nutrient absorption.
DESIGN AND ANALYSIS OF HEAVY VEHICLE CHASSIS USING HONEY COMB STRUCTUREIjripublishers Ijri
Automotive chassis is a skeletal frame on which various mechanical parts like engine, tires, axle assemblies, brakes,
steering etc. are bolted. The chassis is considered to be the most significant component of an automobile. It is the most
crucial element that gives strength and stability to the vehicle under different conditions.
This thesis deals with the design optimization and material suggestion for heavy vehicle chassis (container vehicle).
In the first step literature survey will be conducted for further processes (for the selection of material and geometric
selection).
In the next step modeling will be done to carry out the analysis. Structural Analysis will be conducted using traditional
material M.S; Composite materials FRP (E-glass)& Carbon epoxy (S-2 glass), also analysis will be conducted on present
and updated models.
In the next step impact test and fatigue analysis will be conducted on same to find impact and fatigue characteristics.
Objective: By doing this project chassis manufacturing company can save time & efforts because of easy manufacturing
method. End user can save money on chassis purchase and savings on reduced fuel consumption due to low weight of
chassis with composites
This document provides an overview of instrumentation theory and basic instruments. It discusses process variables like flow, pressure, temperature, and level. It describes common primary elements used to measure these variables, such as orifice plates, pressure gauges, and level measurement techniques. It also covers topics like transmitters, manometers, and control loops.
The document summarizes information about orifice plates used for flow measurement. It describes the basic principles of how orifice plates work using Bernoulli's principle to create a pressure drop for measurement. It provides details on different types of orifice plates as well as factors to consider in design. Orifice plates offer benefits of being cheap and reliable but have limitations for clean fluids only and require maintenance. The company discussed provides custom orifice plate solutions and has supplied plates to major oil and gas companies in India.
The document provides an overview of four-stroke engines, including:
- The four strokes that make up the combustion cycle: intake, compression, power/ignition, and exhaust.
- Key components of four-stroke engines like the intake/exhaust valves, piston, crankshaft, and spark plug.
- The basic operation of a four-stroke petrol/gasoline engine, which draws in an air-fuel mixture, compresses it, ignites it with a spark plug, and exhausts the gases.
The document discusses the history of tire technology, from early solid wheels to modern radial tires. It explains that radial tires, invented in the 1940s, provide major improvements over previous bias ply construction, including lower rolling resistance and improved traction. However, it notes that many in the transport industry have not adopted the tire manufacturer's recommended inflation pressures for radial tires, resulting in wasted money, safety issues, and environmental damage. The optimal tire pressure is needed to achieve the best footprint and balance of tread life, rolling resistance, traction, and vehicle handling.
Performance prediction of a turboshaft engine by using of one dimensional ana...ijmech
Performance estimation of the axial flow gas turbines under variety of operating conditions like different speeds and pressure ratios has been hampered by lack of reliable experimental data and experiments cost.Simulation of gas turbine is a simple way to reduce testing costs and complexity.One-dimensional (1D).Simulation is a simple, fast and accurate method for performance prediction of turbine with different geometries. In this approach, inlet flow conditions and turbine geometry are known and by considering loss model, the turbine performance characteristics are predicted. In following work, that is based on one dimensional modelling method, after the presentation of solution algorithm by trial and error method and introduction of different loss models for modelling, this method were examined for a turbo shaft engine and
compared with experimental results. Comparison of the results with experimental data shows so good adaptation. Also according to these results, Kacker and Okapuu’s developed model gave the closest results to the reference data.
Analytical Evaluation of Generalized Predictive Control Algorithms Using a Fu...inventy
Research Inventy : International Journal of Engineering and Science is published by the group of young academic and industrial researchers with 12 Issues per year. It is an online as well as print version open access journal that provides rapid publication (monthly) of articles in all areas of the subject such as: civil, mechanical, chemical, electronic and computer engineering as well as production and information technology. The Journal welcomes the submission of manuscripts that meet the general criteria of significance and scientific excellence. Papers will be published by rapid process within 20 days after acceptance and peer review process takes only 7 days. All articles published in Research Inventy will be peer-reviewed.
Formulation of data based ann model for human powered oil pressIAEME Publication
This document describes the formulation of an artificial neural network (ANN) model for a human-powered oil press. The researchers conducted experiments to collect data on the oil press's input and output parameters. They developed mathematical models to relate the parameters but also created an ANN model to better handle the complex, nonlinear relationships. The ANN was trained on the experimental data and can now predict the output values corresponding to given input values, providing a "best fit" model for the oil press system. The ANN model allows entrepreneurs to select optimal input combinations to maximize oil extraction and minimize torque/velocity, improving productivity.
The document describes an experiment on flow system control using a PID controller. The objectives are to obtain the system characteristics like overshoot, rise time, settling time, period, and transport delay. It introduces PID controllers and how they work in a closed loop system using proportional, integral, and derivative modes. The apparatus section outlines the experimental setup, which uses a flow system with a square wave input and adjustable setpoint and proportional gain. Calculations are shown for analyzing the system response based on these parameters.
This document summarizes an optimization study to maximize the power output of a ducted vertical axis wind turbine. The study uses computational fluid dynamics (CFD) simulations coupled with a genetic algorithm to optimize the geometry of the duct surrounding the turbine. The duct geometry is defined by 7 curvature points and optimized at 3 positions relative to the turbine center. The optimized duct configuration resulted in a 20° convergence angle with the throat at the turbine center. This optimized duct increased the tip speed ratio and power coefficient at maximum power output and decreased the torque ripple factor compared to an un-ducted turbine.
Comparitive analysis of doa and beamforming algorithms for smart antenna systemseSAT Journals
Abstract This paper revolves around the implementation of Direction of arrival and Adaptive beam-forming algorithms for Smart Antenna Systems. This paper also investigates the implementation of algorithms on various planner array geometries viz. circular and rectangular. Music algorithm is primarily finds the possible location of desired user and adaptive beam-forming algorithms such as LMS, RLS and CMA algorithms adapts the weights of the array. DOA estimation gives the maximum peak of spectrum with respect to angle of arrival where the desired user is supposed to exist. After DOA estimation weights of array antenna are changed with the changing received signal. This methodology is called as Spectral estimation, which allows the antenna pattern to steer in desired direction estimated by DOA and simultaneously null out the interfering signals. Rate of convergence is the major criterion for comparison for adaptive beam-forming algorithms. Keywords: DOA, MUSIC, LMS, RLS, CMA, SAS.
Development of Mathematical Model for Vacuum Damped Recoil SystemIRJET Journal
This document presents a mathematical model for analyzing the behavior of a vacuum damped recoil system. It begins by describing the components of an experimental vacuum damped recoil system model, including a pneumatic cylinder, vacuum gauge, barrel, load cell, and indicator. It then identifies the key variables that define the system: recoil time, force, recoil length, vacuum pressure, cylinder diameter, and barrel weight. Using Buckingham's theorem of dimensional analysis, the document develops equations to calculate recoil time and force as functions of the other variables. Constant values k1 and k2 are determined from experimental data and applied to the equations. The mathematical model allows prediction of recoil time and force based on the system's vacuum pressure
OPTIMIZATION OF COST 231 MODEL FOR 3G WIRELESS COMMUNICATION SIGNAL IN SUBURB...Onyebuchi nosiri
This document describes the optimization of the Cost 231 model for 3G wireless communication signals in a suburban area of Port Harcourt, Nigeria. Field measurements were taken using drive testing equipment. The least squares algorithm was used to optimize parameters in the Cost 231 model based on the measured data. This reduced the mean absolute deviation from 1.196 to 1.179 and the mean squared deviation from 2.01 to 1.94, showing better prediction accuracy of the optimized model compared to the original Cost 231 model for the environment.
An improved tabular technique for presenting the variousAlexander Decker
This document presents an improved tabular technique for showing the algorithms to find initial basic feasible solutions to transportation problems using the Northwest Corner method, Least Cost method, and Vogel Approximation method. The technique uses a single comprehensive table with additional rows and columns ("stages") to sequentially display each step of the algorithms. The document illustrates the technique using a sample transportation problem, presenting the solution processes through stages in multiple tables. It aims to provide a clearer presentation method than previous techniques using multiple separate tables.
Optimization of design of mixed flow centrifugal pump impeller using cfdeSAT Journals
Abstract
Centrifugal pumps are widely used hydraulic machines, irrespective of the fact that their performance is generally not very good. So, turning them into more efficient machines is quite a challenge. The performance of a centrifugal pump is highly dependent on its geometrical parameters and its vane profile. In order to analyze the flow through complex systems like centrifugal pumps, Computation fluid dynamics (CFD) has been used. This work aims to study the performance analysis of a centrifugal mixed flow pump designed to deliver 0.25 m3/s of water with a head of 20 m at a speed of 1450 rpm using ANSYS CFX (ver.14.0). PTC Creo (ver. 2.0) has been used to model the pump unit. The performance of the pump was first determined using the existing vane angles and thickness of the blade then, the inlet vane angle, the outlet vane angle along with the thickness of the blade has been varied to analyze the pump’s performance . The results show that for an initial inlet angle 21.08˚, outlet angle 16.28˚ and blade thickness as 10mm, the efficiency of the pump was 84%. However, the efficiency of pump rises to 89.19% for the optimized angles and blade thickness.
Adaptive pi based on direct synthesis nishantNishant Parikh
This document describes an adaptive proportional-integral (PI) controller for a laboratory level control system. The system consists of two interconnected tanks where the level of the second tank is controlled. Due to changes in plant dynamics over time, an adaptive controller is used. The plant parameters are estimated online using recursive least squares estimation based on input and output signals. The estimated parameters are then used to calculate PI controller parameters to achieve the desired closed-loop response. Experimental results show the controller can maintain level control even after changes in plant dynamics without needing re-calibration.
AIROPT: A Multi-Objective Evolutionary Algorithm based Aerodynamic Shape Opti...Abhishek Jain
Above Research Paper can be downloaded from www.zeusnumerix.com
The paper aims to optimize an airfoil shape for minimum drag and maximum lift to drag ratio. Multi-objective evolutionary algorithm based modular optimization framework is used for shape optimization. The airfoil geometry has been parametrized using Bézier curves for generating the camber and thickness surfaces. XFOIL has been used to estimate the pressure and boundary layer edge velocity distributions. Pareto plots for objectives are shown for both the objectives. Authors - Sandeep S (Zeus Numerix), S Rangasamy (T Cube), S Raghunath (Univ of Queensland)
This document discusses various aerodynamic models used to predict the performance of straight-bladed vertical axis wind turbines (VAWTs). It first describes momentum models, including the rotor blade model and single streamtube model. The rotor blade model calculates forces on blade sections, while the streamtube model represents the turbine as an actuator disk. It then introduces the double-multiple streamtube model which divides the swept volume into streamtubes and calculates upstream and downstream induced velocities. The document also discusses experimental wind tunnel tests using laser Doppler velocimetry and pressure sensors on turbine blades to measure velocities and pressures and validate the momentum model calculations.
Multi objective-optimization-with-fuzzy-based-ranking-for-tcsc-supplementary-...Cemal Ardil
This document summarizes a research paper that investigates using multi-objective optimization and genetic algorithms to design a thyristor controlled series compensator (TCSC) controller to improve both rotor angle stability and voltage stability in a power system. The researchers formulate the controller design as a multi-objective optimization problem with the objectives of improving oscillatory stability and voltage profile. A genetic algorithm is used to generate a Pareto set of optimal solutions. A fuzzy-based method is then employed to select the best compromise solution from the Pareto set. Simulation results demonstrate the effectiveness of the proposed approach.
Time domain sound spectrum measurements in ducted axial fan under stable regi...iaemedu
This document summarizes research on measuring time domain sound spectra in a ducted axial fan under stable operating conditions. The fan test setup and instrumentation are described, including a microphone to capture sound signals, data acquisition system, and LabVIEW software to analyze spectra. Experiments were conducted at varying rotor speeds from 2400-3600 rpm with a throttle position of 6 cm. Results showed that sound pressure amplitude generally increased with rotor speed and fluctuated periodically, with maximum amplitudes ranging from 16-36 dB depending on speed. The time domain spectra provide insights into fan acoustics and stability characteristics under different operating conditions.
This document describes the design and construction of a one-man powered hang glider. It consists of a lightweight trike frame, wings made of fabric stretched over an aluminum skeleton, and a 125cc rear-mounted engine. The total cost to build the hang glider was Rs. 46,952 (approximately $650). Pictures show the various construction steps, including fabricating the trike frame, assembling the wing skeleton, attaching the wings, and test flights of the completed aircraft.
1. The document discusses nanotechnology and its applications in food science and nutrition.
2. It provides background on nanotechnology, including definitions, a brief history, and examples of nano-sized particles commonly found in foods.
3. The document also describes potential applications of nanotechnology in food processing, packaging, and safety, such as using nanosensors to detect pathogens and nanomaterials to enhance flavors or nutrient absorption.
DESIGN AND ANALYSIS OF HEAVY VEHICLE CHASSIS USING HONEY COMB STRUCTUREIjripublishers Ijri
Automotive chassis is a skeletal frame on which various mechanical parts like engine, tires, axle assemblies, brakes,
steering etc. are bolted. The chassis is considered to be the most significant component of an automobile. It is the most
crucial element that gives strength and stability to the vehicle under different conditions.
This thesis deals with the design optimization and material suggestion for heavy vehicle chassis (container vehicle).
In the first step literature survey will be conducted for further processes (for the selection of material and geometric
selection).
In the next step modeling will be done to carry out the analysis. Structural Analysis will be conducted using traditional
material M.S; Composite materials FRP (E-glass)& Carbon epoxy (S-2 glass), also analysis will be conducted on present
and updated models.
In the next step impact test and fatigue analysis will be conducted on same to find impact and fatigue characteristics.
Objective: By doing this project chassis manufacturing company can save time & efforts because of easy manufacturing
method. End user can save money on chassis purchase and savings on reduced fuel consumption due to low weight of
chassis with composites
This document provides an overview of instrumentation theory and basic instruments. It discusses process variables like flow, pressure, temperature, and level. It describes common primary elements used to measure these variables, such as orifice plates, pressure gauges, and level measurement techniques. It also covers topics like transmitters, manometers, and control loops.
The document summarizes information about orifice plates used for flow measurement. It describes the basic principles of how orifice plates work using Bernoulli's principle to create a pressure drop for measurement. It provides details on different types of orifice plates as well as factors to consider in design. Orifice plates offer benefits of being cheap and reliable but have limitations for clean fluids only and require maintenance. The company discussed provides custom orifice plate solutions and has supplied plates to major oil and gas companies in India.
The document provides an overview of four-stroke engines, including:
- The four strokes that make up the combustion cycle: intake, compression, power/ignition, and exhaust.
- Key components of four-stroke engines like the intake/exhaust valves, piston, crankshaft, and spark plug.
- The basic operation of a four-stroke petrol/gasoline engine, which draws in an air-fuel mixture, compresses it, ignites it with a spark plug, and exhausts the gases.
The document discusses the history of tire technology, from early solid wheels to modern radial tires. It explains that radial tires, invented in the 1940s, provide major improvements over previous bias ply construction, including lower rolling resistance and improved traction. However, it notes that many in the transport industry have not adopted the tire manufacturer's recommended inflation pressures for radial tires, resulting in wasted money, safety issues, and environmental damage. The optimal tire pressure is needed to achieve the best footprint and balance of tread life, rolling resistance, traction, and vehicle handling.
This document describes an experimental study on modifying axial fan blade tips with shaped end plates to reduce noise. It motivates the research by explaining how tip leakage flows contribute significantly to fan noise. The study aims to develop passive flow control strategies using end plate designs that reduce noise without hurting efficiency. It reviews previous tip treatment techniques and presents initial results from a conventional square end plate design, finding it controls the tip leakage vortex but causes early breakdown. The goals of further designs are to control the vortex swirl level through variations in end plate thickness with the goal of reducing fan noise.
Sonic soot blowing is presented as an effective and low-cost method for cleaning boiler tubes in pulp and paper plants. It operates by sending compressed air and sound waves into boiler tubes to fluidize and remove ash deposits. This allows for continuous cleaning in short cycles, keeping surfaces clean and improving heat absorption. Case studies show sonic soot blowing can reduce unscheduled outages, lower energy consumption, and pay for itself within two years through improved boiler efficiency and performance.
Stress Analysis of a heavy duty vehicle chassis by using FEADigitech Rathod
This document summarizes a seminar presentation on stress analysis of a heavy duty vehicle chassis using finite element analysis (FEA). The presentation covers the methodology used, which includes modeling the full-scale chassis in CATIA, applying a uniform load distribution in ANSYS, and analyzing stress distributions and deformations. The results show maximum von Mises stresses of 200.67 MPa and deformations of 8.15mm between frame members. Modifications to the cross-section dimensions and connections are suggested to reduce stresses and deformations at critical points and increase chassis life.
The document summarizes the design of an axial fan with a mass flow rate of 1 kg/s and pressure change of 3000Pa. It describes the steps taken, which included mean line analysis, calculation of losses, and CAD design. Iterative calculations were done in MATLAB to determine design parameters like velocities and flow angles. The analysis found the slip factor to be 0.78, leading to an efficiency reduction, while leakage losses were negligible. Dimensions and a 3D model of the designed fan are also presented.
Differential and Rear Axle Drives, by Jeevan B MJeevan B M
A differential is a device capable of transmitting torque and rotation through three shafts, almost always used in one of two ways.
Rear axle drives are the drives which employed for the rear axle the spring take the weight of the body.
This document provides an introduction and overview of Sundek International Decorative Laminate. It discusses Sundek's history and facilities, vision, quality policies, environmental policies, human resources policies, and corporate social responsibility activities. It also outlines why customers should choose Sundek, including their unique anti-aging formula, large design selection, focus on relationships over profits, excellent customer service, stringent quality control, and goal of being a total interior solutions provider.
This document summarizes the design and construction of an axial flow fan testing rig. It includes sections on the introduction to axial fans and their components, literature review on previous fan studies, the three stage design process for the testing rig, experiments conducted with different fan positions and tip clearances, results and discussion of flow rates and efficiencies at various RPMs, and recommendations for future improvements. The overall goal was to design and build a rig to experimentally test the performance of axial fans under different operating conditions.
The document describes a presentation on four-stroke petrol engines. It includes sections on the introduction, construction, working principle, applications, and lubrication of four-stroke petrol engines. The key points are:
1. A four-stroke petrol engine completes its cycle over four strokes of the piston and two revolutions of the crankshaft. It was invented by Nikolaus Otto in 1876.
2. The main parts include the piston, connecting rod, crankshaft, inlet and exhaust valves, spark plug, and carburetor.
3. The four strokes are intake, compression, power, and exhaust. During intake the mixture is drawn in, compression compresses it, combustion powers
KMML is a state-owned company located in Kerala that produces titanium dioxide and other mineral products. It has a worldwide reputation as a socially responsible and eco-friendly company. KMML was established in 1967 to process mineral deposits found along the coast of Kerala. It is fully owned by the Kerala government and has around 2000 employees. The company has a long history dating back to 1909 when German scientist first discovered mineral deposits in the region.
Report on Airless Tyre or Non-Pneumatic tyrePermi Jagadish
1) The document discusses the development of airless tires, also called non-pneumatic tires or Tweels. Several tire companies have experimented with airless tire designs but none have reached mass production yet.
2) Airless tires provide safety benefits like eliminating blowouts and punctures. They also have environmental benefits since they never go flat and can be retreaded, reducing landfill waste.
3) Different airless tire designs take different approaches to replacing the air cushion in traditional tires. Designs include spokes made of polyurethane or composite materials arranged in patterns to absorb impacts.
Modeling and Structural Analysis of Ladder Type Heavy Vehicle FrameIJMER
This document summarizes the modeling and structural analysis of a ladder-type heavy vehicle frame. The authors modeled the frame of a TATA 1109 EX2 heavy vehicle in SOLIDWORKS 2011 using 'C' cross sections. They then imported the model into ANSYS 13.0 to conduct structural analysis with three composite materials - carbon/epoxy, E-glass/epoxy, and S-glass/epoxy - subjected to the same pressures as a steel frame. The results were compared to determine the best composite material for reducing weight while meeting stress and deformation constraints.
This document provides an overview of the contents of a textbook on automobile chassis and body engineering. The textbook covers topics such as chassis frames, steering systems, braking systems, suspension systems, and seats, doors and windows. It also addresses legal aspects of motor vehicles, automobile pollution, and painting of automobiles. The textbook is intended for vocational and diploma students of mechanical engineering. It includes chapters on chassis frames and bodies, steering systems, braking systems, and suspension systems. Each chapter provides explanations of the components, functions, requirements and types within each system.
Design and implementation of antenna control servo system for satellite grouIAEME Publication
This document summarizes the design and implementation of an antenna control servo system for a satellite ground station. It describes the modeling and analysis of the system both theoretically and experimentally. Key aspects include designing the drive control system for the antenna, integrating drive chains for elevation and azimuth axes, optimizing the system through mathematical modeling and simulation, and testing the operational system by tracking real satellite passes. Both simulation and experimental results showed the system providing stable and accurate antenna positioning to receive satellite data as required.
Performance improvement by reducing compressor work of r 134 a and r22 used r...IAEME Publication
This document describes a simulation study comparing the performance of a basic vapor compression refrigeration system to one using a two-phase ejector. The study found that using an ejector with R-134a as the working fluid and optimal ejector geometry parameters increased the system COP by 19.7% compared to the basic system. Key findings included that maximum COP occurred at an ejector area ratio of 14 and entrainment ratio of 0.53. The ejector system performance depended mainly on diffuser efficiency, as higher diffuser efficiency increased pressure and decreased compressor work, thereby increasing COP. Nozzle efficiency also impacted performance, but to a lesser degree.
Pid output fuzzified water level control in mimo coupled tank systemIAEME Publication
This document summarizes the mathematical modeling and control system design of a coupled tank system. It presents the following:
1) A nonlinear model is derived to describe the dynamics of the coupled tank system based on mass balance equations and Bernoulli's equation.
2) The nonlinear model is linearized around an operating point to obtain a linear state space model of the system with state variables representing small perturbations in tank levels.
3) The linearized model reveals that the system is MIMO (multi-input multi-output) with the tank levels dependent on both inflow rates and the differential between tank levels.
Octave wave sound signal measurements in ducted axial fan under stall region ...iaemedu
The document discusses measurements of octave wave sound signals in a ducted axial fan under stall conditions. Experiments were conducted to measure sound pressure levels in the frequency range of 11 Hz to 11100 Hz at different rotor speeds from 2400 to 3600 rpm with the throttle position fixed at 4 cm. Graphs of the results show that sound pressure levels increased with rotor speed and were highest in the stall region, reaching up to 115 dB. The document provides background on axial fan performance, describes the experimental setup and instrumentation used, and analyzes the nature and characteristics of sound signals measured under stall conditions at different rotor speeds.
Octave wave sound signal measurements in ducted axial fan under stall region ...iaemedu
The document discusses measurements of octave wave sound signals in a ducted axial fan under stall conditions. Experiments were conducted to measure sound pressure levels in the frequency range of 11 Hz to 11100 Hz at different rotor speeds from 2400 to 3600 rpm with the throttle position fixed at 4 cm. Graphs of the results show that sound pressure levels increased with rotor speed and were highest in the stall region, reaching up to 115 dB. The document provides background on axial fan performance, describes the experimental setup and instrumentation used, and analyzes the nature and characteristics of sound signals observed under stall conditions.
Octave wave sound signal measurements in ducted axial fan under stall region ...iaemedu
This document discusses measurements of octave wave sound signals in a ducted axial fan under stall conditions at different rotor speeds. It describes the experimental setup, which includes a ducted axial fan rig with variable speed control and a throttle controller. Sound from the fan is measured using a microphone connected to a data acquisition system and sound spectrum analyzer software. The document provides background on sound measurement techniques, defining concepts like frequency, wavelength, velocity and how the spectrum analyzer system works. Graphs of sound level in decibels are presented for different frequencies at the stall region and throttle position of 4 cm from the casing.
Octave wave sound signal measurements in ducted axial fan under stall region ...IAEME Publication
This document discusses measurements of octave wave sound signals in a ducted axial fan under stall conditions at different rotor speeds. It describes the experimental setup, which includes a ducted axial fan rig with variable speed control and a throttle controller. Sound from the fan is measured using a microphone connected to a data acquisition system and sound spectrum analyzer software. The document provides background on sound measurement techniques, defining concepts like frequency, wavelength, velocity and how the spectrum analyzer system works. Graphs of sound levels across the frequency range from 11Hz to 11100Hz are presented for different rotor speeds under stalled conditions at a throttle position of 4cm from the casing.
Octave wave sound signal measurements in ducted axial fan under stall region ...iaemedu
The document discusses measurements of octave wave sound signals in a ducted axial fan under stall conditions. Experiments were conducted to measure sound pressure levels in the frequency range of 11 Hz to 11100 Hz at different rotor speeds from 2400 to 3600 rpm with the throttle position fixed at 4 cm. Graphs of the results show that sound pressure levels increased with rotor speed and were highest in the stall region, reaching up to 115 dB. The document aims to analyze sound characteristics in a ducted axial fan under stall conditions using sound spectrum analysis to better understand fan instability phenomena like rotating stall and surge.
Octave wave sound signal measurements in ducted axial fan under stable region...iaemedu
The document discusses measurements of octave wave sound signals in a ducted axial fan under stable operating conditions. Experiments were conducted to analyze sound pressure level variations at different rotor speeds between 2400-3600 RPM with the throttle position fixed at 7 cm. Microphones were used to measure sound levels from 11Hz to 11100Hz in decibels. The results showed that sound pressure levels generally increased with rotor speed, ranging from 79-105 dB. Higher pressures and amplitudes correlated with increased sound levels. The experiments provide insight into fan acoustics under stable flow conditions.
Octave wave sound signal measurements in ducted axial fan under stable region...iaemedu
This document summarizes a study that measured octave wave sound signals in a ducted axial fan under stable operating conditions. The fan test setup included a variable speed motor, throttle controller, and instrumentation to measure sound levels. Microphones were used to capture sound pressure fluctuations, which were analyzed using a spectrum analyzer. The document describes sound propagation fundamentals and defines key terms like frequency, wavelength, and velocity. Graphs of sound levels across the frequency range were obtained for different rotor speeds and throttle positions in the stable operating region.
Octave wave sound signal measurements in ducted axial fan under stable region...iaemedu
The document discusses measurements of octave wave sound signals in a ducted axial fan under stable operating conditions. Experiments were conducted to analyze sound pressure level variations at different rotor speeds between 2400-3600 RPM with the throttle position fixed at 7 cm. Microphones were used to measure sound levels from 11Hz to 11100Hz in decibels. The results showed that sound pressure levels generally increased with rotor speed, ranging from 79-105 dB. Higher pressures and amplitudes correlated with increased sound levels. The experiments provide insight into fan acoustics under stable flow conditions.
Octave wave sound signal measurements in ducted axial fan under stable region...iaemedu
The document discusses measurements of octave wave sound signals in a ducted axial fan under stable operating conditions. Experiments were conducted to analyze sound pressure level variations at different rotor speeds between 2400-3600 RPM with the throttle position fixed at 7 cm. Microphones were used to measure sound levels from 11Hz to 11100Hz in decibels. The results showed that sound pressure levels generally increased with rotor speed, ranging from 79-105 dB. Higher pressures and amplitudes correlated with increased sound levels. The experiments provide insight into fan acoustics under stable flow conditions.
This document describes an experiment using a least squares method to identify the dynamic model of a level control system in a didactic plant. The plant uses a Foundation Fieldbus communication protocol. The experiment applies a PRBS signal to excite the system and records the input and output signals. It then uses a non-recursive least squares estimator to identify the system and approximate its behavior with a second order transfer function. The results showed that the identification technique was able to accurately model the dynamic response of the level control loop.
Experimental dataset to develop a parametric model based of DC geared motor i...IJECEIAES
This paper presents the application of a System Identification based on Particle Swarm Optimization (PSO) technique to develop parametric model of experimental dataset of DC Geared motor in feeder machine. The experimental was conducted to measure the input (voltage) and output (speed) data. The actual data is used to be optimized using PSO algorithm. The parameter emphasized is Time, Man Square Error (MSE) and Average Time. One of the best model has been chosen based on the optimum parameters.
Time domain sound spectrum measurements in ducted axial fan under stable regi...iaemedu
This document summarizes research on measuring time domain sound spectra in a ducted axial fan under stable operating conditions. The fan test setup and instrumentation are described, including a microphone to capture sound signals, data acquisition system, and LabVIEW software to analyze spectra. Experiments were conducted at varying rotor speeds from 2400-3600 rpm with a throttle position of 6 cm. Results showed that sound pressure amplitude generally increased with rotor speed and fluctuated periodically due to fan blade passage. Maximum amplitudes ranged from 16-36 dB depending on rotor speed. The time domain spectra measurements provide insights into fan acoustics and stability characteristics.
Time domain sound spectrum measurements in ducted axial fan under stable regi...iaemedu
This document discusses time domain sound spectrum measurements in a ducted axial fan under stable operating conditions. It describes the experimental setup used, which includes a ducted axial fan rig, variable frequency drive for speed control, and automatic throttle controller. Sound is measured using a microphone connected to a data acquisition system and analyzed using LABVIEW software. Different time domain sound signals are measured at various rotor speeds and throttle positions to understand the fan's sound characteristics under stable operation. Formulas related to sound wave propagation speed, wavelength, frequency, and pressure variation with time are also presented.
Time domain sound spectrum measurements in ducted axial fan under stable regi...iaemedu
This document summarizes research on measuring time domain sound spectra in a ducted axial fan under stable operating conditions. The fan test setup and instrumentation are described, including a microphone to capture sound signals, data acquisition system, and LabVIEW software to analyze spectra. Experiments were conducted at varying rotor speeds from 2400-3600 rpm with a throttle position of 6 cm. Results showed that sound pressure amplitude generally increased with rotor speed and fluctuated periodically due to fan blade passage. Maximum amplitudes ranged from 16-36 dB depending on rotor speed. The time domain spectra measurements provide insights into fan acoustics and stability characteristics.
This document describes a lab experiment where students modeled a motor/flywheel system using LabVIEW. They collected data for sinusoidal and square voltage waveforms and compared the experimental model to a theoretical model based on motor specifications. Key aspects of the comparison included transfer functions, step responses, and Bode plots. Students determined parameter values, created VIs to collect experimental data, and analyzed results to compare experimental and theoretical models.
Hopfield neural network based selective harmonic elimination for h bridgeIAEME Publication
This document summarizes a research paper that proposes using a Hopfield neural network to generate switching angles for selective harmonic elimination (SHE) in an H-bridge inverter. The paper first describes the conventional Newton-Raphson method for calculating switching angles to eliminate specific harmonics. It then introduces using a Hopfield neural network as an alternative method that has advantages like faster response time and ability to dynamically adjust the switching angles. The paper outlines the Hopfield neural network algorithm and compares simulation results between the two methods, showing the neural network approach produces switching angles that achieve similar harmonic elimination as the conventional method.
Dynamic behaviour of hydraulic pressure relief valveIAEME Publication
1) The document analyzes the dynamic behavior of a direct spring-operated pressure relief valve and the influence of the poppet's radial clearance on that behavior.
2) A mathematical model is developed and represented in MATLAB/Simulink. Simulation results show that smaller radial clearances lead to longer opening times and greater pressure overshoots, while larger clearances result in shorter opening times and smaller overshoots.
3) An optimal poppet radial clearance is estimated that provides a settling time of 0.02 seconds and minimizes pressure overshoot. The model can predict valve behavior and help select optimal settings.
Similar to Numerical simulation of flow modeling in ducted axial fan using simpson’s 13rd rule (20)
Tech transfer making it as a risk free approach in pharmaceutical and biotech iniaemedu
Tech transfer is a common methodology for transferring new products or an existing
commercial product to R&D or to another manufacturing site. Transferring product knowledge to the
manufacturing floor is crucial and it is an ongoing approach in the pharmaceutical and biotech
industry. Without adopting this process, no company can manufacture its niche products, let alone
market them. Technology transfer is a complicated, process because it is highly cross functional. Due
to its cross functional dependence, these projects face numerous risks and failure. If anidea cannot be
successfully brought out in the form of a product, there is no customer benefit, or satisfaction.
Moreover, high emphasis is in sustaining manufacturing with highest quality each and every time. It
is vital that tech transfer projects need to be executed flawlessly. To accomplish this goal, risk
management is crucial and project team needs to use the risk management approach seamlessly.
Integration of feature sets with machine learning techniquesiaemedu
This document summarizes a research paper that proposes a novel approach for spam filtering using selective feature sets combined with machine learning techniques. The paper presents an algorithm and system architecture that extracts feature sets from emails and uses machine learning to classify emails and generate rules to identify spam. Several metrics are identified to evaluate the efficiency of the feature sets, including false positive rate. An experiment is described that uses keyword lists as feature sets to train filters and compares the proposed approach to other spam filtering methods.
Effective broadcasting in mobile ad hoc networks using gridiaemedu
This document summarizes a research paper that proposes a new grid-based broadcasting mechanism for mobile ad hoc networks. The paper argues that flooding approaches to broadcasting are inefficient and cause network congestion. The proposed approach divides the network into a hierarchical grid structure. When a node needs to broadcast a message, it sends the message to the first node in the appropriate grid, which is then responsible for updating and forwarding the message within that grid. Simulation results showed the grid-based approach outperformed other broadcasting protocols and was more reliable, efficient and scalable.
Effect of scenario environment on the performance of mane ts routingiaemedu
The document analyzes the effect of scenario environment on the performance of the AODV routing protocol in mobile ad hoc networks (MANETs). It studies AODV performance under different scenarios varying network size, maximum node speed, and pause time. The performance is evaluated based on packet delivery ratio, throughput, and end-to-end delay. The results show that AODV performs best in some scenarios and worse in others, indicating that scenario parameters significantly impact routing protocol performance in MANETs.
Adaptive job scheduling with load balancing for workflow applicationiaemedu
This document discusses adaptive job scheduling with load balancing for workflow applications in a grid platform. It begins with an abstract that describes grid computing and how scheduling plays a key role in performance for grid workflow applications. Both static and dynamic scheduling strategies are discussed, but they require high scheduling costs and may not produce good schedules. The paper then proposes a novel semi-dynamic algorithm that allows the schedule to adapt to changes in the dynamic grid environment through both static and dynamic scheduling. Load balancing is incorporated to handle situations where jobs are delayed due to resource fluctuations or overloading of processors. The rest of the paper outlines the related works, proposed scheduling algorithm, system model, and evaluation of the approach.
This document summarizes research on transaction reordering techniques. It discusses transaction reordering approaches based on reducing resource conflicts and increasing resource sharing. Specifically, it covers:
1) A "steal-on-abort" technique that reorders an aborted transaction behind the transaction that caused the abort to avoid repeated conflicts.
2) A replication protocol that attempts to reorder transactions during certification to avoid aborts rather than restarting immediately.
3) Transaction reordering and grouping during continuous data loading to prevent deadlocks when loading data for materialized join views.
The document discusses semantic web services and their challenges. It provides an overview of semantic web technologies like WSDL, SOAP, UDDI, and OIL which are used to build semantic web services. The semantic web architecture adds semantics to web services through ontologies written in OWL and DAML+OIL. Key approaches to semantic web services include annotation, composition, and addressing privacy and security. However, semantic web services still face challenges in achieving their full potential due to issues in representation, reasoning, and a lack of real-world applications and data.
Website based patent information searching mechanismiaemedu
This document summarizes a research paper on developing a website-based patent information searching mechanism. It discusses how patent information can be used for technology development, rights acquisition and utilization, and management information. It describes different types of patent searches including novelty, validity, infringement, and state-of-the-art searches. It also evaluates and compares two major patent websites, Delphion and USPTO, in terms of their search capabilities and features.
Revisiting the experiment on detecting of replay and message modificationiaemedu
This document summarizes a research paper that proposes methods for detecting message modification and replay attacks in ad-hoc wireless networks. It begins with background on security issues in wireless networks and types of attacks. It then reviews existing intrusion detection systems and security techniques. Related work that detects attacks using features from the media access control layer or radio frequency fingerprinting is also discussed. The paper aims to present a simple, economical, and platform-independent system for detecting message modification, replay attacks, and unauthorized users in ad-hoc networks.
1) The document discusses the Cyclic Model Analysis (CMA) technique for sequential pattern mining which aims to predict customer purchasing behavior.
2) CMA calculates the Trend Distribution Function from sequential patterns to model purchasing trends over time. It then uses Generalized Periodicity Detection and Trend Modeling to identify periodic patterns and construct an approximating model.
3) The Cyclic Model Analysis algorithm is applied to further analyze the patterns, dividing the domain into segments where the distribution function is increasing or decreasing and applying the other techniques recursively to fully model the cyclic behavior.
Performance analysis of manet routing protocol in presenceiaemedu
This document analyzes the performance of different routing protocols in a mobile ad hoc network (MANET) under hybrid traffic conditions. It simulates a MANET with 50 nodes moving at speeds up to 20 m/s using the AODV, DSDV, and DSR routing protocols. Traffic included both constant bit rate and variable bit rate sources. Results found that AODV had lower average end-to-end delay and higher packet delivery ratios than DSDV and DSR as the percentage of variable bit rate traffic increased. AODV also performed comparably under both low and high node mobility scenarios with hybrid traffic.
Performance measurement of different requirements engineeringiaemedu
This document summarizes a research paper that compares the performance of different requirements engineering (RE) process models. It describes three RE process models - two existing linear models and the authors' iterative model. It also reviews literature on common RE activities and issues with descriptive models not reflecting real-world practices. The authors conducted interviews at two Indian companies to model their RE processes and compare them to the three models. They found the existing linear models did not fully capture the iterative nature of observed RE processes.
This document proposes a mobile safety system for automobiles that uses Android operating system. The system has two main components: a safety device and an automobile base unit. The safety device allows users to monitor the vehicle's location on a map, check its status, and control functions remotely. It communicates with the base unit in the vehicle using GPRS. The base unit collects data from sensors, determines the vehicle's GPS location, and can execute control commands like activating the brakes or switching off the engine. The document provides details on the design and algorithms of both components and includes examples of Java code implementation. The goal is to create an intelligent, secure and easy-to-use mobile safety system for vehicles using embedded systems and Android
Efficient text compression using special character replacementiaemedu
The document describes a proposed algorithm for efficient text compression using special character replacement and space removal. The algorithm replaces words with non-printable ASCII characters or combinations of characters to compress text files. It uses a dynamic dictionary to map words to their symbols. Spaces are removed from the compressed file in some cases to further reduce file size. Experimental results show the algorithm achieves better compression ratios than LZW, WinZip 10.0 and WinRAR 3.93 for various text file types while allowing lossless decompression.
The document discusses agile programming and proposes a new methodology. It provides an overview of existing agile methodologies like Scrum and Extreme Programming. Scrum uses short sprints to define tasks and deadlines. Extreme Programming focuses on practices like test-first development, pair programming, and continuous integration. The document notes drawbacks like an inability to support large or multi-site projects. It proposes designing a new methodology that combines the advantages of existing methods while overcoming their deficiencies.
Adaptive load balancing techniques in global scale grid environmentiaemedu
The document discusses various adaptive load balancing techniques for distributed applications in grid environments. It first describes adaptive mesh refinement algorithms that partition computational domains using space-filling curves or by distributing grids independently or at different levels. It also discusses dynamic load balancing using tiling and multi-criteria geometric partitioning. The document then covers repartitioning algorithms based on multilevel diffusion and the adaptive characteristics of structured adaptive mesh refinement applications. Finally, it discusses adaptive workload balancing on heterogeneous resources by benchmarking resource characteristics and estimating application parameters to find optimal load distribution.
A survey on the performance of job scheduling in workflow applicationiaemedu
This document summarizes a survey on job scheduling performance in workflow applications on grid platforms. It discusses an adaptive dual objective scheduling (ADOS) algorithm that takes both completion time and resource usage into account for measuring schedule performance. The study shows ADOS delivers good performance in completion time, resource usage, and robustness to changes in resource performance. It also describes the system architecture used, which includes a planner and executor component. The planner focuses on scheduling to minimize completion time while considering resource usage, and can reschedule if needed. The executor enacts the schedule on the grid resources.
A survey of mitigating routing misbehavior in mobile ad hoc networksiaemedu
This document summarizes existing methods to detect misbehavior in mobile ad hoc networks (MANETs). It discusses how routing protocols assume nodes will cooperate fully, but misbehavior like packet dropping can occur. It describes several techniques to detect misbehavior, including watchdog, ACK/SACK, TWOACK, S-TWOACK, and credit-based/reputation-based schemes. Credit-based schemes use virtual currencies to provide incentives for nodes to forward packets, while reputation-based schemes track nodes' past behaviors. The document aims to survey approaches for mitigating the impact of misbehaving nodes in MANET routing.
A novel approach for satellite imagery storage by classifyiaemedu
This document presents a novel approach for classifying and storing satellite imagery by detecting and storing only non-duplicate regions. It uses kernel principal component analysis to reduce the dimensionality and extract features of satellite images. Fuzzy N-means clustering is then used to segment the images into blocks. A duplication detection algorithm compares blocks to identify duplicate and non-duplicate regions. Only the non-duplicate regions are stored in the database, improving storage efficiency and updating speed compared to completely replacing existing images. Support vector machines are used to categorize the non-duplicate blocks into the appropriate classes in the existing images.
A self recovery approach using halftone images for medical imageryiaemedu
This document summarizes a proposed approach for securely transferring medical images over the internet using visual cryptography and halftone images. The approach uses error diffusion techniques to generate a halftone host image from the grayscale medical image. Shadow images are then created from the halftone host image using visual cryptography algorithms. When stacked together, the shadow images reveal the secret medical image. The halftone host image also contains an embedded logo that can be extracted to verify the integrity of the reconstructed image without a trusted third party.