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Jawaid I. Inayat-hussain - One of the best experts on this subject based on the ideXlab platform.
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Fuzzy control scheme for dual-acting magnetic bearing Actuator System
IEEE Conference on Robotics Automation and Mechatronics 2004., 2004Co-Authors: M.k. Habib, Jawaid I. Inayat-hussainAbstract:Active magnetic bearings are increasingly being utilized in rotating machinery applications as an alternative to the conventional rolling-clement and fluid-film bearing types. Magnetic bearing is an open-loop unstable System, and in most practical applications, a PID controller is utilized to ensure stable operation of the rotating machinery. The PID controller, however, becomes ineffective when the machine operates in highly nonlinear regimes. This paper develops a fuzzy logic control scheme to improve the performance of a dual-acting magnetic bearing Actuator System operating in nonlinear regimes. The nonlinearity in this System is due to the relationship between the forces generated in the electromagnetic Actuator and the coil current and the air gap between the rotor and the stator. The dynamic response of the magnetic bearing Actuator System based on the fuzzy logic scheme proposed in this work was found to be much better as compared to the response of the System based on the conventional PD controller. The fuzzy logic control scheme presented in this work may be used for the nonlinear control of Systems that operates in nonlinear regimes.
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Control of dual acting magnetic bearing Actuator System using fuzzy logic
Proceedings 2003 IEEE International Symposium on Computational Intelligence in Robotics and Automation. Computational Intelligence in Robotics and Aut, 2003Co-Authors: M.k. Habib, Jawaid I. Inayat-hussainAbstract:In this paper, a fuzzy logic scheme is developed to improve the performance of a magnetic bearing control System. The developed fuzzy logic strategy is utilized in the non-linear control of a dual-acting magnetic bearing Actuator System. The mathematical model of a dual acting magnetic bearing axis has been developed. The non-linearity in this System is due to the relationship between the forces generated in the electromagnetic Actuator and the coil current and the air gap between the rotor and the stator. Non-linearities in magnetic bearing Systems limit the control effectiveness and the region of stable performance. The model is used for dynamic simulation purposes and it is not directly used in the fuzzy controller design. Active magnetic bearing with adaptive fuzzy control showed a good improvement in step response compared to a linear PID or a steady state controller. With the presented fuzzy logic based strategy, nonlinear controllers for nonlinear applications can be designed with little effort.
M.k. Habib - One of the best experts on this subject based on the ideXlab platform.
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Fuzzy control scheme for dual-acting magnetic bearing Actuator System
IEEE Conference on Robotics Automation and Mechatronics 2004., 2004Co-Authors: M.k. Habib, Jawaid I. Inayat-hussainAbstract:Active magnetic bearings are increasingly being utilized in rotating machinery applications as an alternative to the conventional rolling-clement and fluid-film bearing types. Magnetic bearing is an open-loop unstable System, and in most practical applications, a PID controller is utilized to ensure stable operation of the rotating machinery. The PID controller, however, becomes ineffective when the machine operates in highly nonlinear regimes. This paper develops a fuzzy logic control scheme to improve the performance of a dual-acting magnetic bearing Actuator System operating in nonlinear regimes. The nonlinearity in this System is due to the relationship between the forces generated in the electromagnetic Actuator and the coil current and the air gap between the rotor and the stator. The dynamic response of the magnetic bearing Actuator System based on the fuzzy logic scheme proposed in this work was found to be much better as compared to the response of the System based on the conventional PD controller. The fuzzy logic control scheme presented in this work may be used for the nonlinear control of Systems that operates in nonlinear regimes.
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Control of dual acting magnetic bearing Actuator System using fuzzy logic
Proceedings 2003 IEEE International Symposium on Computational Intelligence in Robotics and Automation. Computational Intelligence in Robotics and Aut, 2003Co-Authors: M.k. Habib, Jawaid I. Inayat-hussainAbstract:In this paper, a fuzzy logic scheme is developed to improve the performance of a magnetic bearing control System. The developed fuzzy logic strategy is utilized in the non-linear control of a dual-acting magnetic bearing Actuator System. The mathematical model of a dual acting magnetic bearing axis has been developed. The non-linearity in this System is due to the relationship between the forces generated in the electromagnetic Actuator and the coil current and the air gap between the rotor and the stator. Non-linearities in magnetic bearing Systems limit the control effectiveness and the region of stable performance. The model is used for dynamic simulation purposes and it is not directly used in the fuzzy controller design. Active magnetic bearing with adaptive fuzzy control showed a good improvement in step response compared to a linear PID or a steady state controller. With the presented fuzzy logic based strategy, nonlinear controllers for nonlinear applications can be designed with little effort.
Mohd Fuaa'd Rahmat - One of the best experts on this subject based on the ideXlab platform.
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Optimization of Modified Sliding Mode Control for an Electro-Hydraulic Actuator System with Mismatched Disturbance
2018 5th International Conference on Electrical Engineering Computer Science and Informatics (EECSI), 2018Co-Authors: Mohd Fuaa'd Rahmat, Siti Marhainis Othman, S. Md RozaliAbstract:This paper presents a modified sliding mode controller (MSMC) for tracking purpose of electro-hydraulic Actuator System with mismatched disturbance. The main contribution of this study is in attempting to find the optimal tuning of sliding surface parameters in the MSMC using a hybrid algorithm of particle swarm optimization (PSO) and gravitational search algorithms (GSA), in order to produce the best System performance and reduce the chattering effects. In this regard, Sum square error (SSE) has been used as the objective function of the hybrid algorithm. The performance was evaluated based on the tracking error identified between reference input and the System output. In addition, the efficiency of the designed controller was verified within a simulation environment under various values of external disturbances. Upon drawing a comparison of PSOGSA with PSO and GSA alone, it was learnt that the proposed controller MSMC, which had been integrated with PSOGSA was capable of performing more efficiently in trajectory control and was able to reduce the chattering effects of MSMC significantly compared to MSMC-PSO and MSMC-GSA, respectively when the highest external disturbance, 10500N being injected into the System's Actuator.
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Disturbance rejection using Model Predictive control for pneumatic Actuator System
2016 IEEE 12th International Colloquium on Signal Processing & Its Applications (CSPA), 2016Co-Authors: Siti Fatimah Sulaiman, Mohd Fuaa'd Rahmat, Ahmad 'athif Mohd Faudzi, Khairuddin OsmanAbstract:`Disturbance' is one of the main reasons why the position control in pneumatic System is difficult to achieve. Disturbance can cause the process (controlled variable) to deviate from their respective set-point and at the same time tracking the set-point is quite impossible. The controller is said to be good if it has the ability to reject the disturbance, as this will ensure the stability of the controller itself. This paper presents the performance analysis of Model Predictive Controller (MPC) to reject the disturbance added into the System while controlling the position of cylinder's stroke for pneumatic Actuator System. The disturbance was added into the System in order to test the performance of the controllers in rejecting the disturbance. The input constraint was also applied to the MPC algorithm to make the controller operates closer to the limits. In this paper, the performance of MPC in rejecting the disturbance as well as controlling the position of the pneumatic Actuator System was compared with Proportional-Integral (PI) controller. Simulation results show the constrained MPC is more effective than unconstrained MPC and PI controller in producing better transient response and minimizing error.
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Application of Draw Wire Sensor in the Tracking Control of An Electro Hydraulic Actuator System
Jurnal Teknologi, 2015Co-Authors: Sazilah Salleh, Mohd Fuaa'd Rahmat, Siti Marhainis Othman, Hafilah Zainal AbidinAbstract:A draw wire sensor is considered as a contact measurement method. It is normally used to measure the speed and position of a System. A draw wire sensor is convenient especially when a low cost solution and a small sensor dimension are desired. The objective of this paper is to describe the application of draw wire sensor in control tracking of electro hydraulic Actuator System. This research started with the modelling of electro hydraulic Actuator System by using System identification approach. During the data taking process, an experiment is conducted using electro hydraulic Actuator test bed. A draw wire sensor is attached to the load of electro hydraulic Actuator System to measure the output displacement when the System is injected with the desired input signal. Draw wire sensor is measuring the output displacement in millimeters and then the signal is converted to voltage reading regarding to the given input signal. The input and output signal is collected and is used in System identification technique to obtain the best mathematical model that can represent the electro hydraulic Actuator System. Once a model is obtained, a Self Tuning Controller (STC) with Generalize Minimum Variance Control (GMVC) strategy is designed to control the tracking performance of the electro hydraulic Actuator System. The designed controller is tested in simulation and experiment mode. Then, the output result from both modes is compared. The results show that the output performance from both modes are almost similar. Thus, this research had shown that a draw wire sensor has a significant role in capturing an accurate output data from electro hydraulic Actuator System even with or without the controller.
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Review on modeling and controller design of hydraulic Actuator Systems
International Journal on Smart Sensing and Intelligent Systems, 2015Co-Authors: S. Salleh, S. M. Othman, Mohd Fuaa'd Rahmat, K. A. DanapalasingamAbstract:The purpose of this paper is to review the literature on modeling and previous control strategies of the hydraulic Actuator System proposed by most of the researchers around the world. Before comes to the main discussion, some background information related to hydraulic Actuator will be presented. This review includes a short summary and conclusion for hydraulic Actuator System. The repercussion of this review is for future inventions of a better and robust hydraulic Actuator System.
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Design of unconstrained and constrained model predictive control for pneumatic Actuator System: Set-point tracking
2015 IEEE Conference on Systems Process and Control (ICSPC), 2015Co-Authors: Siti Fatimah Sulaiman, Mohd Fuaa'd Rahmat, Ahmad 'athif Mohd Faudzi, Khairuddin OsmanAbstract:This paper presents the performance analysis of Model Predictive Controller (MPC) for the controlling of position of cylinder's stroke for pneumatic Actuator System. The mathematical model of the System was obtained using System Identification (SI) technique and the linear approach using AutoRegressive with Exogenous Input (ARX) was chosen as a model structure to describe the dynamic behavior and characteristics of the System. The input constraints were applied to the MPC algorithm to make the controller operates closer to the limits. In this paper, the performance of MPC in controlling the position of the pneumatic Actuator System as well as tracking the set-point was compared with Proportional-Integral (PI) controller. The performance of the controllers were assessed by taking into account the percentage overshoot (%OS), settling time (ts), rise time (tr), and steady-state error (SSE) of the responses. Simulation results show the effectiveness of the MPC with constrained input in producing better transient response and minimizing SSE.
Seibum B. Choi - One of the best experts on this subject based on the ideXlab platform.
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Adaptive Engagement Control of a Self-Energizing Clutch Actuator System Based on Robust Position Tracking
IEEE ASME Transactions on Mechatronics, 2018Co-Authors: Seibum B. Choi, Jiwon J. OhAbstract:This paper considers the problem of designing an engagement controller for a clutch Actuator System having a self-energizing mechanism. Since such a System includes a torque amplification mechanism, parametric uncertainties in the model may lead to large erroneous results in the clutch torque controller. To compensate this undesirable effect, adaptive sliding-mode control is applied based on the Actuator position tracking. Estimations of the disk friction coefficient and Actuator motion parameters are employed to control the engagement torque properly. The disk friction coefficient adaptation provides online stiffness inference for the engagement force while in contact. Moreover, the unstructured disturbance is also compensated by a disturbance observer. Experimental verifications show the improved performance of the developed control method.
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Design and Modeling of a Clutch Actuator System With Self-Energizing Mechanism
IEEE ASME Transactions on Mechatronics, 2011Co-Authors: Seibum B. ChoiAbstract:The engineering technology for automotive Systems is currently edging toward improving fuel economy. Transmission is one of the major parts to determine overall energy efficiency. The goal of this paper is to investigate the feasibility of a new clutch Actuator in order to increase power transmitting efficiency. The new clutch Actuator has self-energizing mechanism to amplify the normal force applied on the contact surfaces for the engagement. It allows the clutch module to consume less amount of energy for actuating the overall System. The equations of motion of the clutch mechanism coupled with a dc motor are represented to capture the essential dynamics. By using the proposed model, a model-based position-tracking controller is developed for the engagement of the clutch. Also, passivity analysis of the Actuator System is performed to prevent the clutch from being stuck. Finally, the self-energizing effect and torque transmissibility of the proposed System and motion controller are validated experimentally.
Takenori Atsumi - One of the best experts on this subject based on the ideXlab platform.
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Control System Improvement for Triple-Stage-Actuator System of Hard Disk Drive Using the RBode Plot
IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society, 2019Co-Authors: Hayato Kato, Takenori AtsumiAbstract:We present a control System design method for triple-stage-Actuator Systems of HDDs (Hard Disk Drives) with the Robust Bode (RBode) plot. The RBode plot represents robust performance criteria with the gray area on the Open-loop Bode plot. By using the RBode plot, we can design the controller which satisfy robust performance with visualized guidelines. This paper presents the adaptation method of RBode plot in Multi-Input-Single-Output System and then the design method of the control System for the triple-stage-Actuator Systems of HDDs. Simulation results show that the proposed method enables us to improve positioning error in the triple-stage Actuator System of HDDs.
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Triple-Stage-Actuator System of Head-Positioning Control in Hard Disk Drives
IEEE Transactions on Magnetics, 2013Co-Authors: Takenori Atsumi, S. Nakamura, M. Furukawa, I. Naniwa, J. XuAbstract:In this paper, we propose a triple-stage Actuator System with a thermal Actuator to increase a servo bandwidth of a head-positioning control System in hard disk drives. The thermal Actuator is good for control in high frequency range because it has little negative impact caused by mechanical resonances. Therefore, the proposed System with a thermal Actuator can control the head position beyond the major mechanical resonances caused by a voice coil motor (VCM) or piezoelectric (PZT) Actuator. As a result, the servo bandwidth of the proposed triple-stage Actuator System can be higher than that of the conventional dual-stage Actuator System which consists of the VCM and the PZT Actuators. Simulation results of sensitivity functions showed that the disturbance-compensation performance below 2 kHz will be improved by 6 dB with proposed control System.
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Quadruple-Stage Actuator System for Magnetic-Head Positioning System in HDDs
IEEE Transactions on Industrial Electronics, 1Co-Authors: Takenori Atsumi, Shota YabuiAbstract:In this paper, we present a magnetic-head positioning System in hard disk drives (HDDs) with a quadruple-stage Actuator System. The quadruple-stage Actuator System consists of a voice coil motor, a milli Actuator with two piezoelectric (PZT) elements, a micro Actuator with two PZT elements, and a thermal Actuator. The milli Actuator is the first generation of a secondary Actuator for a dual-stage Actuator in the HDDs and moves a sway mode of a suspension in a head-stack assembly. The micro Actuator is the second generation of the secondary Actuator for the dual-stage Actuator in the HDDs and moves a yaw mode of the suspension. The thermal Actuator is an Actuator in a development phase for future HDDs. It consists of heaters embedded in the magnetic head and move read/write elements in a horizontal direction with thermal expansion. The achievable disturbance-rejection performance of the quadruple-stage-Actuator System is higher than that of the conventional triple-stage Actuator System because the proposed System can decrease a negative impact caused by the stroke limitation of the thermal Actuator. As a result, the quadruple-stage-Actuator System enables us to improve the positioning accuracy under the external vibrations by about 48% from that with the triple-stage-Actuator System.
