The Experts below are selected from a list of 55296 Experts worldwide ranked by ideXlab platform
Norbert C. Cheung - One of the best experts on this subject based on the ideXlab platform.
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An Adaptive High-Precision Tracking Controller for the Coupled Switched Reluctance Two-Finger Gripper
IEEE Transactions on Magnetics, 2015Co-Authors: Yu Zou, Norbert C. Cheung, J. F. PanAbstract:An adaptive high-precision position control algorithm with online system identification is implemented onto the switched reluctance, two-finger gripper with coupled magnetic paths. Theoretical investigation proves that the magnetic paths from the two fingers are highly coupled. Without the introduction of any decoupling scheme, the position control performance under the proportional integral differential controller and the adaptive controller is inspected and the control results are compared. Experimental results verify that, without introducing any decoupling mechanism, the adaptive controller is capable of independent control of each finger with a high-precision and uniform position control performance.
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Performance Analysis and Decoupling Control of an Integrated Rotary–Linear Machine With Coupled Magnetic Paths
IEEE Transactions on Magnetics, 2014Co-Authors: Norbert C. CheungAbstract:An integrated rotary-linear machine based on switched reluctance principle is investigated. The characteristics of the motor are analyzed by finite-element methods, with particular emphasis on the coupled magnetic paths. Results from numerical calculation are verified by the hardware experiment. The simple yet effective decoupling algorithm for the independent position control of both rotary and linear axes is proposed. Implemented with the proportional-integral-differential algorithm, the motor is capable of high-precision rotary and linear position tracking with the steady error within 0.3 ° and 10 μm, respectively.
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Performance Analysis and Decoupling Control of an Integrated Rotary–Linear Machine With Coupled Magnetic Paths
IEEE Transactions on Magnetics, 2014Co-Authors: J. F. Pan, Yu Zou, Norbert C. CheungAbstract:An integrated rotary-linear machine based on switched reluctance principle is investigated. The characteristics of the motor are analyzed by finite-element methods, with particular emphasis on the coupled magnetic paths. Results from numerical calculation are verified by the hardware experiment. The simple yet effective decoupling algorithm for the independent position control of both rotary and linear axes is proposed. Implemented with the proportional-integral- differential algorithm, the motor is capable of high-precision rotary and linear position tracking with the steady error within 0.3̂ and 10 μ m, respectively.Department of Electrical Engineerin
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Fuzzy PID control for the linear switched reluctance machine
2013 5th International Conference on Power Electronics Systems and Applications(PESA), 2013Co-Authors: J. F. Pan, F. J. Meng, Wanlai Jiang, Norbert C. CheungAbstract:This paper investigates the fuzzy control method for the linear switched reluctance motor (LSRM) drive system. Modeling of the LSRM is constructed based on the finite element method (FEM) environment Maxwell and the control system is analyzed by the co-simulation environment with Simplorer. Both the performance of the fuzzy proportional integral differential (PID) controller and the traditional PID controller are compared. The simulation results prove that the fuzzy PID controller yields faster rising time and smaller overshoot, compared with the traditional PID controller.Department of Electrical EngineeringRefereed conference pape
Haecheon Choi - One of the best experts on this subject based on the ideXlab platform.
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Iterative Feedback Tuning of the proportional-integral-differential Control of Flow Over a Circular Cylinder
IEEE Transactions on Control Systems Technology, 2019Co-Authors: Donggun Son, Haecheon ChoiAbstract:In this paper, we numerically perform a feedback gain optimization of the proportional-integral-differential (PID) control of flows over a circular cylinder at Re = 60 and 100. We measure the transverse velocity at a centerline location in the wake as a sensing variable and provide blowing and suction at the upper and lower slots on the cylinder surface as an actuation based on the PID control. The PID control gains are optimized by an iterative feedback tuning method that is one of the typical model-free gain optimization methods. For the feedback tuning, the cost function $J$ is constructed such that the optimal control gains minimize the sensing velocity fluctuations. The control gains are iteratively updated using the gradient of the cost function until the control system satisfies a stopping criterion. For various sensing locations, the present control with optimal control gains successfully reduces the sensing velocity fluctuations and attenuates or annihilates vortex shedding in the wake, resulting in the reduction of the mean drag and lift fluctuations. It is also shown that the optimal actuation velocities obtained from different sensing locations have nearly the same phase in time. Finally, the occurrence of the integral windup and differential oscillations during PID controls is discussed.
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A proportional–integral–differential control of flow over a circular cylinder
Philosophical transactions. Series A Mathematical physical and engineering sciences, 2011Co-Authors: Donggun Son, Seung Jeon, Haecheon ChoiAbstract:In the present study, we apply proportional (P), proportional–integral (PI) and proportional–differential (PD) feedback controls to flow over a circular cylinder at Re = 60 and 100 for suppression of vortex shedding in the wake. The transverse velocity at a centreline location in the wake is measured and used for the feedback control. The actuation (blowing/suction) is provided to the flow at the upper and lower slots on the cylinder surface near the separation point based on the P, PI or PD control. The sensing location is varied from 1d to 4d from the centre of the cylinder. Given each sensing location, the optimal proportional gain in the sense of minimizing the sensing velocity fluctuations is obtained for the P control. The addition of I and D controls to the P control certainly increases the control performance and broadens the effective sensing location. The P, PI and PD controls successfully reduce the velocity fluctuations at sensing locations and attenuate vortex shedding in the wake, resulting in reductions in the mean drag and lift fluctuations. Finally, P controls with phase shift are constructed from successful PI controls. These phase-shifted P controls also reduce the strength of vortex shedding, but their results are not as good as those from the corresponding PI controls.
J. F. Pan - One of the best experts on this subject based on the ideXlab platform.
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An Adaptive High-Precision Tracking Controller for the Coupled Switched Reluctance Two-Finger Gripper
IEEE Transactions on Magnetics, 2015Co-Authors: Yu Zou, Norbert C. Cheung, J. F. PanAbstract:An adaptive high-precision position control algorithm with online system identification is implemented onto the switched reluctance, two-finger gripper with coupled magnetic paths. Theoretical investigation proves that the magnetic paths from the two fingers are highly coupled. Without the introduction of any decoupling scheme, the position control performance under the proportional integral differential controller and the adaptive controller is inspected and the control results are compared. Experimental results verify that, without introducing any decoupling mechanism, the adaptive controller is capable of independent control of each finger with a high-precision and uniform position control performance.
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Performance Analysis and Decoupling Control of an Integrated Rotary–Linear Machine With Coupled Magnetic Paths
IEEE Transactions on Magnetics, 2014Co-Authors: J. F. Pan, Yu Zou, Norbert C. CheungAbstract:An integrated rotary-linear machine based on switched reluctance principle is investigated. The characteristics of the motor are analyzed by finite-element methods, with particular emphasis on the coupled magnetic paths. Results from numerical calculation are verified by the hardware experiment. The simple yet effective decoupling algorithm for the independent position control of both rotary and linear axes is proposed. Implemented with the proportional-integral- differential algorithm, the motor is capable of high-precision rotary and linear position tracking with the steady error within 0.3̂ and 10 μ m, respectively.Department of Electrical Engineerin
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Fuzzy PID control for the linear switched reluctance machine
2013 5th International Conference on Power Electronics Systems and Applications(PESA), 2013Co-Authors: J. F. Pan, F. J. Meng, Wanlai Jiang, Norbert C. CheungAbstract:This paper investigates the fuzzy control method for the linear switched reluctance motor (LSRM) drive system. Modeling of the LSRM is constructed based on the finite element method (FEM) environment Maxwell and the control system is analyzed by the co-simulation environment with Simplorer. Both the performance of the fuzzy proportional integral differential (PID) controller and the traditional PID controller are compared. The simulation results prove that the fuzzy PID controller yields faster rising time and smaller overshoot, compared with the traditional PID controller.Department of Electrical EngineeringRefereed conference pape
Ilya V. Burkov - One of the best experts on this subject based on the ideXlab platform.
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Discussion on: “Robustness of PID-controlled Manipulators vis-à-vis Actuator Dynamics and External Disturbances”
European Journal of Control, 2007Co-Authors: Leonid B. Freidovich, Ilya V. BurkovAbstract:The paper by Chaillet, Loria, and Kelly is devoted to study robustness of mechanical systems controlled by proportional integral-differential (PID) regulators. These control strategies are classical and are the most frequently used in industrial applications of robotic manipulators despite various other available techniques. There is a number of results on properties of PID-controlled mechanical systems, see references in the paper and [1,2,5–7,11–13] to mention a few.
Toyohiko J. Konno - One of the best experts on this subject based on the ideXlab platform.
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Evaluation of spatial and temporal resolution on in situ annealing aberration-corrected transmission electron microscopy with proportional-integral-differential controller.
Microscopy (Oxford England), 2019Co-Authors: Yusuke Shimada, Kenta Yoshida, Koji Inoue, Takahisa Shiraishi, Takanori Kiguchi, Yasuyoshi Nagai, Toyohiko J. KonnoAbstract:The in situ annealing observation in transmission electron microscope (TEM) is one of the effective methods for imaging thermally induced microstructural changes. For applying this dynamical characterization to bulk samples fabricated by ion-milling, electro-polishing or focused ion beam (FIB) mill, it is generally needed to use a heating-pot type system. We here report an initial trial to improve the spatial and temporal resolution during the in-situ annealing observation of bulk samples using a spherical aberration corrected (AC) TEM with a new thermal control unit. The information limit of 1.5 A and the point resolution of 2.0 A are achieved under isothermal annealing at 350°C, which is the same resolution at room temperature, and it is affected strongly of sample drift by the temperature variation. The sample is heated at a heating rate of +1.0°C/s, the drift distance observed by a TV readout speed CCD camera is less than 2.0 A/s.
