The Experts below are selected from a list of 309 Experts worldwide ranked by ideXlab platform
Zhaohua Yang - One of the best experts on this subject based on the ideXlab platform.
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a modified adaptive backstepping method for shaft deflection tracking control of magnetically suspended Momentum Wheel with nonlinear magnetic torque
Journal of The Franklin Institute-engineering and Applied Mathematics, 2018Co-Authors: Xinwei Wang, Yuanjin Yu, Zhaohua YangAbstract:Abstract A modified adaptive backstepping tracking method is proposed to improve the tracking performance of the magnetic bearing system with nonlinear magnetic toque. For a magnetically suspended Momentum Wheel, two dimensional gyroscopic torque can be produced when the rotor shaft is actively deflected by the active magnetic bearing. High precision rapid tracking control of shaft deflection is desiderated to provide high precision and wide bandwidth outputting torque. The nonlinearity of magnetic bearing is analyzed initially, and the stiffness coefficients of magnetic bearing can be treated as bounded continuous functions with respect to deflection angles. A fuzzy function based adaptive law is proposed to estimate the stiffness coefficients. Combining with a modified backstepping method, the proposed control strategy can deal with the nonlinearity efficiently when the shaft deflects rapidly, and its stability is proved by Lyapunov stability theory. To validate the effectiveness of this method, numerous simulations are performed and the results indicate that this method improves the tracking precision when tracking high frequency reference deflection angles.
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Fuzzy Adaptive Back-Stepping Sliding Mode Controller for High-Precision Deflection Control of the Magnetically Suspended Momentum Wheel
IEEE Transactions on Industrial Electronics, 2018Co-Authors: Yuanjin Yu, Zhaohua YangAbstract:In the magnetically suspended Momentum Wheel, the orientation of the rotor shaft can be actively changed to generate 2-D torques. An adaptive back-stepping sliding mode control (SMC) method is proposed to precisely control the deflection angles. First, the magnetic torques generated by the magnetic bearings are analyzed. According to the magnetic torques, coupled torques exist and influence the tracking control of the deflection angles. It is difficult to model the coupled torque disturbances because their relationship with translations, deflection angles, currents, and other parameters is complex. By analyzing the dynamics and the magnetic torques, the tracking error dynamic is modeled as a system with unmodeled disturbances and parameter uncertainties. A back-stepping integral sliding mode controller whose sliding surface considers the integrals of the angle error and the tracking error is designed for this system. The switching gain should be relatively large to ensure system stability. This will induce severe chattering, which hinders the precision of the deflection angle. A fuzzy algorithm whose inputs include the sliding value and deflection angle is designed to adaptively tune the switching gain of the sliding mode method. According to the simulation and experimental results, the proposed method improves tracking performances and reduces chattering.
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a non saturated sliding mode control of shaft deflection for magnetically suspended Momentum Wheel with coupled disturbance and saturated amplifier
Acta Astronautica, 2017Co-Authors: Xinwei Wang, Yuanjin Yu, Zhaohua YangAbstract:Abstract The magnetically suspended Momentum Wheel (MSMW) expands its fresh functions through deflecting the rotary shaft. An improved nonsingular terminal sliding-mode control (NTSMC) method is proposed to achieve high precision tracking of shaft deflection for the MSMW under coupled disturbance and saturated amplifier. A novel structure designed for this MSMW is introduced initially. Its magnetic torque model and coupled disturbance are analyzed, and a tracking error dynamic model is established. Then a NTSMC method is applied to shaft tracking control. As the saturation of amplifier influences tracking performances, an improved NTSMC is designed to deal with saturation problem. Finally, several simulations are performed to validate the effectiveness of the proposed method. The results indicate the proposed method improves the tracking precision and velocity compared with the conventional integral sliding-mode method, and solves the saturation problem compared with existing NTSMC method.
Yuanjin Yu - One of the best experts on this subject based on the ideXlab platform.
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a modified adaptive backstepping method for shaft deflection tracking control of magnetically suspended Momentum Wheel with nonlinear magnetic torque
Journal of The Franklin Institute-engineering and Applied Mathematics, 2018Co-Authors: Xinwei Wang, Yuanjin Yu, Zhaohua YangAbstract:Abstract A modified adaptive backstepping tracking method is proposed to improve the tracking performance of the magnetic bearing system with nonlinear magnetic toque. For a magnetically suspended Momentum Wheel, two dimensional gyroscopic torque can be produced when the rotor shaft is actively deflected by the active magnetic bearing. High precision rapid tracking control of shaft deflection is desiderated to provide high precision and wide bandwidth outputting torque. The nonlinearity of magnetic bearing is analyzed initially, and the stiffness coefficients of magnetic bearing can be treated as bounded continuous functions with respect to deflection angles. A fuzzy function based adaptive law is proposed to estimate the stiffness coefficients. Combining with a modified backstepping method, the proposed control strategy can deal with the nonlinearity efficiently when the shaft deflects rapidly, and its stability is proved by Lyapunov stability theory. To validate the effectiveness of this method, numerous simulations are performed and the results indicate that this method improves the tracking precision when tracking high frequency reference deflection angles.
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Fuzzy Adaptive Back-Stepping Sliding Mode Controller for High-Precision Deflection Control of the Magnetically Suspended Momentum Wheel
IEEE Transactions on Industrial Electronics, 2018Co-Authors: Yuanjin Yu, Zhaohua YangAbstract:In the magnetically suspended Momentum Wheel, the orientation of the rotor shaft can be actively changed to generate 2-D torques. An adaptive back-stepping sliding mode control (SMC) method is proposed to precisely control the deflection angles. First, the magnetic torques generated by the magnetic bearings are analyzed. According to the magnetic torques, coupled torques exist and influence the tracking control of the deflection angles. It is difficult to model the coupled torque disturbances because their relationship with translations, deflection angles, currents, and other parameters is complex. By analyzing the dynamics and the magnetic torques, the tracking error dynamic is modeled as a system with unmodeled disturbances and parameter uncertainties. A back-stepping integral sliding mode controller whose sliding surface considers the integrals of the angle error and the tracking error is designed for this system. The switching gain should be relatively large to ensure system stability. This will induce severe chattering, which hinders the precision of the deflection angle. A fuzzy algorithm whose inputs include the sliding value and deflection angle is designed to adaptively tune the switching gain of the sliding mode method. According to the simulation and experimental results, the proposed method improves tracking performances and reduces chattering.
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a non saturated sliding mode control of shaft deflection for magnetically suspended Momentum Wheel with coupled disturbance and saturated amplifier
Acta Astronautica, 2017Co-Authors: Xinwei Wang, Yuanjin Yu, Zhaohua YangAbstract:Abstract The magnetically suspended Momentum Wheel (MSMW) expands its fresh functions through deflecting the rotary shaft. An improved nonsingular terminal sliding-mode control (NTSMC) method is proposed to achieve high precision tracking of shaft deflection for the MSMW under coupled disturbance and saturated amplifier. A novel structure designed for this MSMW is introduced initially. Its magnetic torque model and coupled disturbance are analyzed, and a tracking error dynamic model is established. Then a NTSMC method is applied to shaft tracking control. As the saturation of amplifier influences tracking performances, an improved NTSMC is designed to deal with saturation problem. Finally, several simulations are performed to validate the effectiveness of the proposed method. The results indicate the proposed method improves the tracking precision and velocity compared with the conventional integral sliding-mode method, and solves the saturation problem compared with existing NTSMC method.
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Adaptive back-stepping tracking control for rotor shaft tilting of active magnetically suspended Momentum Wheel
Isa Transactions, 2014Co-Authors: Yuanjin Yu, Biao Xiang, Jiancheng Fang, Chun-e WangAbstract:Two-dimensional gyroscopic torque can be produced by tilting the rotor shaft of the active magnetically suspended Momentum Wheel. The nonlinear magnetic torque is analyzed and then an adaptive back-stepping tracking method is proposed to deal with the nonlinearity and uncertainty. The nonlinearity of magnetic torque is represented as bounded unknown uncertainty stiffness, and an adaptive law is proposed to estimate the stiffness. Combined with back-stepping method, the proposed method can deal with the uncertainty. This method is designed by Lyapunov stability theory to ensure the stability, and its effectiveness is validated by simulations and experiments. These results indicate that this method can realize higher tracking precision and faster tracking velocity than the conventional cross feedback method to provide high precision and wide bandwidth outputting torque.
Keiken Ninomiya - One of the best experts on this subject based on the ideXlab platform.
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Design of H∞ Attitude Controllers for Spacecraft Using a Magnetically Suspended Momentum Wheel
European Journal of Control, 1997Co-Authors: Tatsuaki Hashimoto, Keiken NinomiyaAbstract:This paper suggests a method to design a H ∞ attitude controller for a three-axis-stabilised satellite using a magnetic bearing Momentum Wheel (MBMW) with gimballing capability. According to our method, we can explicitly take into account non-linearity of the actuator and flexibility of appendages in order to design a high performance attitude control system. A double loops control scheme, consisting of the Wheel control loop and the satellite control loop, is adopted as a method to solve problems on controllability and observability occurring in the system model. In the design of the Wheel control loop, the magnetic bearing non-linearity is modelled by parameter variations and equivalent disturbances, and a structured model uncertainty matrix is used. In the satellite control loop, structural flexibility resulting from appendages attached to the satellite's main body, such as solar paddles, is considered as a model uncertainty factor causing the satellite's inertia tensor to vary in frequency domain, and an unstructured model uncertainty matrix is used. The effectiveness of the designed H ∞ controllers in improving the control performance is confirmed through computer simulations.
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design of h attitude controllers for spacecraft using a magnetically suspended Momentum Wheel
European Journal of Control, 1997Co-Authors: Tatsuaki Hashimoto, Keiken NinomiyaAbstract:This paper suggests a method to design a H ∞ attitude controller for a three-axis-stabilised satellite using a magnetic bearing Momentum Wheel (MBMW) with gimballing capability. According to our method, we can explicitly take into account non-linearity of the actuator and flexibility of appendages in order to design a high performance attitude control system. A double loops control scheme, consisting of the Wheel control loop and the satellite control loop, is adopted as a method to solve problems on controllability and observability occurring in the system model. In the design of the Wheel control loop, the magnetic bearing non-linearity is modelled by parameter variations and equivalent disturbances, and a structured model uncertainty matrix is used. In the satellite control loop, structural flexibility resulting from appendages attached to the satellite's main body, such as solar paddles, is considered as a model uncertainty factor causing the satellite's inertia tensor to vary in frequency domain, and an unstructured model uncertainty matrix is used. The effectiveness of the designed H ∞ controllers in improving the control performance is confirmed through computer simulations.
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Control system design to cope with non-linearities of a magnetically suspended Momentum Wheel for satellites
1994Co-Authors: Tatsuaki Hashimoto, Keiken NinomiyaAbstract:Attitude control system for a satellite using a magnetic bearing Momentum Wheel (MBMW) with gimballing capability involves double control loops: the inner loop to control the Wheel`s gimballing to be stable while it is exchanging the angular Momentum with the spacecraft main body, and the outer loop for controlling satellite`s attitude. To cope with the magnetic bearing`s nonlinearity in the inner control loop, a sliding-mode controller is proposed. which is usually known to have simple control structure as well as anti-disturbance robustness. In this case, moreover, the sliding mode controller particularly provides the merit to feedback the Wheel`s rotational velocity automatically into the gim-balling control. The designed controller`s performance is validated by numerical simulation. Additionally, a simple analytical form of the closed servo loop transfer function of the inner loop, which is necessary for the outer loop design, is proposed based upon numerical simulations on the system response.
Ebrahim Esmailzadeh - One of the best experts on this subject based on the ideXlab platform.
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experimental investigation of active yaw moment control system using a Momentum Wheel
Systems Science & Control Engineering, 2017Co-Authors: Ankur Arora, Fereydoon Diba, Ebrahim EsmailzadehAbstract:ABSTRACTActive yaw moment control is one of the most effective methods to improve the lateral stability and safety of vehicle. In this method, the overall yaw moment of the vehicle is modified by applying the corrective yaw moment generated by the systems that are mostly dependent on the tyre and road interaction. A unique technique to generate the corrective yaw moment has been considered and experimentally analysed in this work. This system utilizes a Momentum Wheel to generate the corrective yaw moment, which is independent of the tyre/road interaction, and is not limited by the adhesion between the tyre and road. A prototype model has been designed and developed to conduct the experimental tests and also to analyse the vehicle dynamics responses and examine the effectiveness of the designed controller. A microcontroller along with the essential sensors has been employed in the prototype to execute the embedded control system, which consists of the control algorithms, states estimator and the Kalman fi...
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integrated Momentum Wheel and differential braking control to improve vehicle dynamic performance
Proceedings of the Institution of Mechanical Engineers Part I: Journal of Systems and Control Engineering, 2013Co-Authors: Fereydoon Diba, Ebrahim EsmailzadehAbstract:Recent studies showed that active yaw moment control is the most effective method to improve the stability and road handling of vehicles. Corrective yaw moment action should be applied to a vehicle in order to improve the vehicle dynamic performance. The corrective yaw moment is directly related to the interaction between the tires and road, which could either be generated directly or indirectly. Subsequently, the performance of the yaw moment control system, in low-friction road conditions, would noticeably be reduced. An innovative method is proposed to generate the corrective yaw moment by utilizing a Momentum Wheel that works independent of the tire/road interaction. A comprehensive dynamic analysis of this model, when is integrated with a direct yaw moment control system, has been carried out. Computer simulation results for the vehicle model combined with an integrated Momentum Wheel and differential braking, under different road conditions, are presented. Language: en
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Dynamic performance enhancement of vehicles with controlled Momentum Wheel system
2012 American Control Conference (ACC), 2012Co-Authors: Fereydoon Diba, Ebrahim EsmailzadehAbstract:Active yaw moment control is one the method in order to control the vehicle stability and improve its handling. In this method, a corrective yaw moment would be applied to the vehicle which can modify the dynamic behavior of the vehicle. This corrective yaw moment could be generated directly or indirectly and it would be a function of friction between tire and road. Therefore in low friction conditions, like icy roads, the ordinary yaw moment control system couldn't produce sufficient corrective yaw moment. In this paper a new approach which is inspired from aerospace technology is introduced to control the vehicle handling and stability. This innovative method uses a Momentum Wheel to produce corrective yaw moment which is independent from tire road interaction. The dynamic analysis of the model has been performed and computer simulation results for different road conditions are presented.
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ACC - Dynamic performance enhancement of vehicles with controlled Momentum Wheel system
2012 American Control Conference (ACC), 2012Co-Authors: Fereydoon Diba, Ebrahim EsmailzadehAbstract:Active yaw moment control is one the method in order to control the vehicle stability and improve its handling. In this method, a corrective yaw moment would be applied to the vehicle which can modify the dynamic behavior of the vehicle. This corrective yaw moment could be generated directly or indirectly and it would be a function of friction between tire and road. Therefore in low friction conditions, like icy roads, the ordinary yaw moment control system couldn't produce sufficient corrective yaw moment. In this paper a new approach which is inspired from aerospace technology is introduced to control the vehicle handling and stability. This innovative method uses a Momentum Wheel to produce corrective yaw moment which is independent from tire road interaction. The dynamic analysis of the model has been performed and computer simulation results for different road conditions are presented.
Dongxu Li - One of the best experts on this subject based on the ideXlab platform.
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Improving Performance of Cantilevered Momentum Wheel Assemblies by Soft Suspension Support
Shock and Vibration, 2020Co-Authors: Weiyong Zhou, Dongxu LiAbstract:This paper focuses on improving the performance of the rigid support cantilevered Momentum Wheel assemblies (CMWA) by soft suspension support. A CMWA, supported by two angular contact ball bearings, was modeled as a Jeffcott rotor. The support stiffness, before and after in series with a linear soft suspension support, were simplified as two Duffing's type springs respectively. The result shows that the rigid support CMWA produces large disturbance force at the resonance speed range. The soft suspension CMWA can effectively reduce the force on the bearing (also disturbance forces produced by the CMWA) at high rotational speed, and also reduce the nonlinear characteristic of the stiffness. However, the instability of the soft suspension CMWA will limit the maximum rotational speed of the CMWA. Thus, a "proper" stiffness of the soft suspension system is a trade-off strategy between reduction of the force and extension of the speed range simultaneously.
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design and test of a soft suspension system for cantilevered Momentum Wheel assembly
Proceedings of the Institution of Mechanical Engineers Part G: Journal of Aerospace Engineering, 2013Co-Authors: Weiyong Zhou, Dongxu Li, Jianping JiangAbstract:This article concentrates on design and test of a soft suspension system for cantilevered Momentum Wheel assembly. First, a soft suspension system consisting of four folded beams was designed via the finite element method. Next, a mathematical model was employed to investigate the performance of the soft suspension cantilevered Momentum Wheel assembly. Finally, the natural frequencies of the cantilevered Momentum Wheel assembly were verified by ‘hammering test’ and the microvibrations produced were measured by a force-acceleration measurement system consisting of a Kistler table and several accelerometers. The results show that the natural frequencies and critical speed obtained by the experiment coincided well with the mathematical model; the soft suspension system can effectively isolate the disturbances produced by the rotor when the cantilevered Momentum Wheel assembly operates above the critical speed; and the maximum rotational speed increases from 4900 to 6400 r/min when the vertical beam of the so...
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experimental research on a vibration isolation platform for Momentum Wheel assembly
Journal of Sound and Vibration, 2013Co-Authors: Weiyong Zhou, Dongxu LiAbstract:Abstract This paper focuses on experimental research on a vibration isolation platform for Momentum Wheel assembly (MWA). A vibration isolation platform, consisting of four folded beams, was designed to isolate the microvibrations produced by MWA during operation. The performance of the platform was investigated with an impact test to verify the natural frequencies and damping coefficients of the system when the MWA was at rest, and with a measurement system consisting of a Kistler table and an optical tabletop to monitor the microvibrations produced when the MWA operated at stable speed. The results show that although the sixth natural frequency of the system is 26.29 Hz (1577 rev/min) when the MWA is at rest, the critical speed occurs at 2600 rev/min due to the gyroscopic effect of the flyWheel, and that the platform can effectively isolate the high frequency disturbances in the 100–300 Hz range in all six degrees of freedom. Thus, the gyroscopic effect force deserves more attention in the design and analysis of vibration isolation platform for rotating Wheel assembly, and the platform in this paper is particularly effective for MWA, which generally operates at high rotating speed range.
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design and analysis of an intelligent vibration isolation platform for reaction Momentum Wheel assemblies
Journal of Sound and Vibration, 2012Co-Authors: Weiyong Zhou, Dongxu LiAbstract:Abstract This study focuses on design and analysis of an intelligent vibration isolation platform for reaction Wheel assemblies (RWAs) and Momentum Wheel assemblies (MWAs). A passive platform consisting of four folded beams is designed and analysed for MWAs. A simple and effective mathematical model is developed for the system consisting of the platform and MWAs, and this model is used to investigate the passive vibration isolation performance. Further development is performed to produce an intelligent platform for RWAs, with piezoelectric sensors and actuators bonded to the vertical beams. The flyWheel imbalance and impulse load are assumed to be input disturbances for the investigation of the active vibration isolation performance by the finite element method (FEM). The simulation results show that the passive vibration isolation platform is particularly effective for the suppression of a high frequency range vibration for MWAs, and the intelligent platform using velocity feedback control effectively attenuates the dynamic amplification of amplitude at resonance for RWAs. Thus, it is concluded that the passive platform can be used as a vibration isolation platform for MWAs and that the intelligent one can be used for RWAs.
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Design and analysis of an intelligent vibration isolation platform for reaction/Momentum Wheel assemblies
Journal of Sound and Vibration, 2012Co-Authors: Weiyong Zhou, Dongxu LiAbstract:Abstract This study focuses on design and analysis of an intelligent vibration isolation platform for reaction Wheel assemblies (RWAs) and Momentum Wheel assemblies (MWAs). A passive platform consisting of four folded beams is designed and analysed for MWAs. A simple and effective mathematical model is developed for the system consisting of the platform and MWAs, and this model is used to investigate the passive vibration isolation performance. Further development is performed to produce an intelligent platform for RWAs, with piezoelectric sensors and actuators bonded to the vertical beams. The flyWheel imbalance and impulse load are assumed to be input disturbances for the investigation of the active vibration isolation performance by the finite element method (FEM). The simulation results show that the passive vibration isolation platform is particularly effective for the suppression of a high frequency range vibration for MWAs, and the intelligent platform using velocity feedback control effectively attenuates the dynamic amplification of amplitude at resonance for RWAs. Thus, it is concluded that the passive platform can be used as a vibration isolation platform for MWAs and that the intelligent one can be used for RWAs.