The Experts below are selected from a list of 5049 Experts worldwide ranked by ideXlab platform
W Panusittikorn - One of the best experts on this subject based on the ideXlab platform.
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modeling and control of a magnetostrictive tool Servo system
American Control Conference, 2004Co-Authors: W PanusittikornAbstract:This paper addresses the modeling and development of a nonlinear control methodology for a magnetostrictive system. As an Application of smart materials, magnetostrictive transducers can generate high mechanical strain with a broadband response and provide accurate positioning. Even though these properties characterize a good tool Servo Application in precision machining, the actuators contain significant magnetic hysteresis and are highly nonlinear when combined with 2/sup nd/ order dynamics of a tool fixture. Full utilization of these transducers generally requires an advanced controller as well as accurate model of the transducer dynamics in response to various inputs. At moderate to high drives, the magnetostrictive actuator develops highly significant hysteresis on top of the dynamics of a tool fixture. Many sophisticated control schemes have been proposed to deal with this nonlinearity. This paper presents the development of a sliding mode controller to control a tool Servo system for various inputs in the presence of highly nonlinear dynamics.
Matti Vilenius - One of the best experts on this subject based on the ideXlab platform.
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on the damping of water hydraulic cylinder drives
Proceedings of the JFPS International Symposium on Fluid Power, 1999Co-Authors: T. Virvalo, Esa Makinen, Matti VileniusAbstract:The main aim when designing a controller for a demanding water hydraulic Servo Application is to find a good and practical method for increasing system damping. The low natural damping of water hydraulic cylinder drives has to be carefully considered also in open loop control Applications. The damping of a cylinder drive depends on many factors. Traditionally, mainly based on the linear model, damping is considered to result from viscous friction force. However, if viscous friction force were the only factor achiving damping of a system, it should have to be unpractically great. In this paper the effects of the main factors influencing the damping of water hydraulic cylinder drives are studied on the basis of experimental data and simulation. The individual effects of these factors are studied by comparing simulation results with experimental open loop velocity and pressure measurements.
T. Virvalo - One of the best experts on this subject based on the ideXlab platform.
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on the damping of water hydraulic cylinder drives
Proceedings of the JFPS International Symposium on Fluid Power, 1999Co-Authors: T. Virvalo, Esa Makinen, Matti VileniusAbstract:The main aim when designing a controller for a demanding water hydraulic Servo Application is to find a good and practical method for increasing system damping. The low natural damping of water hydraulic cylinder drives has to be carefully considered also in open loop control Applications. The damping of a cylinder drive depends on many factors. Traditionally, mainly based on the linear model, damping is considered to result from viscous friction force. However, if viscous friction force were the only factor achiving damping of a system, it should have to be unpractically great. In this paper the effects of the main factors influencing the damping of water hydraulic cylinder drives are studied on the basis of experimental data and simulation. The individual effects of these factors are studied by comparing simulation results with experimental open loop velocity and pressure measurements.
Esa Makinen - One of the best experts on this subject based on the ideXlab platform.
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on the damping of water hydraulic cylinder drives
Proceedings of the JFPS International Symposium on Fluid Power, 1999Co-Authors: T. Virvalo, Esa Makinen, Matti VileniusAbstract:The main aim when designing a controller for a demanding water hydraulic Servo Application is to find a good and practical method for increasing system damping. The low natural damping of water hydraulic cylinder drives has to be carefully considered also in open loop control Applications. The damping of a cylinder drive depends on many factors. Traditionally, mainly based on the linear model, damping is considered to result from viscous friction force. However, if viscous friction force were the only factor achiving damping of a system, it should have to be unpractically great. In this paper the effects of the main factors influencing the damping of water hydraulic cylinder drives are studied on the basis of experimental data and simulation. The individual effects of these factors are studied by comparing simulation results with experimental open loop velocity and pressure measurements.
Wan Ismail - One of the best experts on this subject based on the ideXlab platform.
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torque ripple reduction in proportional integral pi control of direct current dc motor drives
2006Co-Authors: Wan Robiah, Wan IsmailAbstract:The used of DC motor these recent years has been increased due to the human needs that been applied to the robotic, machine and others. In this project, the classical technique control which is PI controller has been studied for Servo Application to drive the system or loads to control speed and torque. The main objective of this project is to reduce the torque ripple in DC motor drives by using unipolar switching scheme instead of bipolar switching scheme. Besides, this project objective is also to obtain good performances of the DC motor drives which are minimum of overshoot and fast transient response. To design this controller, the cascade control structure has been applied. In this report, the torque and speed control will be discussed. In the first stage, the PI controller is designed to get the proper value of gain Kp and Ki for speed and torque controller by using linear theory analysis. Then the PI values of the torque and speed will be evaluated under a large signal analysis using Simulink Matlab. Finally, the torque control to observe the torque ripple reduction using unipolar switching scheme of DC motor drives has been constructed and simulated using ORCAD PSPICE (the schematic circuit can be presented as practical experimental set-up).