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Cong Peng - One of the best experts on this subject based on the ideXlab platform.
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a two stage Synchronous Vibration control for magnetically suspended rotor system in the full speed range
IEEE Transactions on Industrial Electronics, 2020Co-Authors: Cong Peng, Mengting Zhu, Kun Wang, Yuan Ren, Zhiquan DengAbstract:The Vibration suppression in the presence of gyroscopic effects is an important issue for safe operations in magnetic bearing levitated varying speed rotor system. This paper proposes a Synchronous Vibration control method with a two-stage notch filter for the magnetically suspended rotor system with strong gyroscopic effects. First, the dynamics of the magnetically suspended rotor system with Synchronous Vibrations in the rotational motion is modeled. Then the proposed two-stage notch filter is designed and the solution of the two-stage switching point is derived to distinguish low speed and high speed. Stability analysis is also presented in the low-speed region and the high-speed region, respectively. Finally, simulation results demonstrate that the stability can be guaranteed by adjusting the phase shift angle of the notch filter over the entire speed range. Further experimental results confirm the effectiveness of the proposed suppression method.
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Vibration Torque Suppression for Magnetically Suspended Flywheel Using Improved Synchronous Rotating Frame Transformation
Hindawi Limited, 2019Co-Authors: Cong Peng, Kaiwen Cai, Zhiquan DengAbstract:Synchronous Vibration, a common issue in active magnetic bearing (AMB) system, is mainly caused by mass imbalance of the rotor. It comes with high-power consumption and serious impact on the housing base, dramatically degrading the performance of AMB. Magnetically suspended flywheel (MSFW), which owns a flat rotor and consequently shows strong gyroscopic effects even at low operating speed, requires additional attention not only for suppressing the Synchronous Vibration but also for maintaining the overall stability faced with the coupled dynamics. In this work, in order to suppress the Vibration torques in MSFW with significant gyroscopic effects, an improved Synchronous rotating frame- (SRF-) based control method is proposed. The proposed method introduces the compensation phase for stability adjustment and aims at simultaneously suppressing the Synchronous components in the coupled axes. Firstly, the Vibration torque model of MSFW is established, and the baseline control strategy for suspension and gyroscopic effects restrain is derived. Then, the principle and implementation of the improved SRF-based Vibration torque method are analyzed, which aims at suppressing the Synchronous Vibration torques through attenuating Synchronous components in coil currents. Moreover, the stability of the overall closed-loop system is analyzed. Finally, the effectiveness of the proposed method is verified through simulation and experimental results
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complete Synchronous Vibration suppression for a variable speed magnetically suspended flywheel using phase lead compensation
IEEE Transactions on Industrial Electronics, 2018Co-Authors: Cong Peng, Shiqiang Zheng, Ziyuan Huang, Xinxiu ZhouAbstract:The Synchronous Vibration rising from the magnetically suspended flywheel (MSFW) will drastically reduce the pointing precision of the satellites. In this paper, the high precision suppression for the frequency-varying Synchronous Vibration forces in the permanent-magnet-biased hybrid MSFW is investigated. First, the Synchronous Vibration forces generated in the permanent-magnet-biased hybrid magnetic bearing are modeled and analyzed. Then, a practical and effective Synchronous Vibration suppression method is proposed to plug into the baseline magnetic suspension system. The proposed method ascertains the overall system stability over the entire speed range by an adjustable phase angle. Moreover, it eliminates the residual Synchronous Vibration forces in the negative displacement stiffness by considering phase-lag influence of the power amplifier. The direct testing for the Synchronous Vibration forces proves the feasibility of the proposed suppression method.
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a novel cross feedback notch filter for Synchronous Vibration suppression of an msfw with significant gyroscopic effects
IEEE Transactions on Industrial Electronics, 2017Co-Authors: Cong Peng, Jinji Sun, Cunxiao Miao, Jiancheng FangAbstract:To effectively suppress the Synchronous Vibration torques for a magnetically suspended rotor (MSR) with significant gyroscopic effects and serious coupling dynamics, a novel cross-feedback notch filter is proposed in this paper. First, the coupled multi-input-multi-output active magnetic bearing rotor system is converted into an equivalent complex single-input single-output (SISO) system. The equivalent transformation aims at easing the controller design and extending the classical stability criterion to the complex coefficient frequency domain. Then, the principle and implementation of the proposed scheme used for Synchronous Vibration suppression over an entire rotational speed range is analyzed in details. The performance compared with the conventional decentralized notch filter is investigated. Moreover, the closed-loop stability, which based on the equivalent complex SISO system and complex-coefficient stability criterion is given. Experimental results on a magnetically suspended flywheel demonstrate the significant effect of the proposed method on both Synchronous Vibration suppression and stability preservation.
Jiancheng Fang - One of the best experts on this subject based on the ideXlab platform.
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a novel cross feedback notch filter for Synchronous Vibration suppression of an msfw with significant gyroscopic effects
IEEE Transactions on Industrial Electronics, 2017Co-Authors: Cong Peng, Jinji Sun, Cunxiao Miao, Jiancheng FangAbstract:To effectively suppress the Synchronous Vibration torques for a magnetically suspended rotor (MSR) with significant gyroscopic effects and serious coupling dynamics, a novel cross-feedback notch filter is proposed in this paper. First, the coupled multi-input-multi-output active magnetic bearing rotor system is converted into an equivalent complex single-input single-output (SISO) system. The equivalent transformation aims at easing the controller design and extending the classical stability criterion to the complex coefficient frequency domain. Then, the principle and implementation of the proposed scheme used for Synchronous Vibration suppression over an entire rotational speed range is analyzed in details. The performance compared with the conventional decentralized notch filter is investigated. Moreover, the closed-loop stability, which based on the equivalent complex SISO system and complex-coefficient stability criterion is given. Experimental results on a magnetically suspended flywheel demonstrate the significant effect of the proposed method on both Synchronous Vibration suppression and stability preservation.
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Optimum Damping Control of the Flexible Rotor in High Energy Density Magnetically Suspended Motor
Journal of Engineering for Gas Turbines and Power-transactions of The Asme, 2015Co-Authors: Jiancheng Fang, Enqiong Tang, Shiqiang ZhengAbstract:The rated rotational speed of the magnetically suspended motor (MSM) is always above the bending critical speed to achieve high energy density. The rotor will have a dramatic resonance when it passes the critical speed. Then, the magnetic bearing has to provide large bearing force to suppress the Synchronous Vibration. However, the bearing force is always limited by magnetic saturation and power amplifier voltage saturation. This paper proposed an optimum damping control method which can make effective use of the limited bearing force to minimize the Synchronous Vibration amplitude of the rotor nearby the critical speed. The accurate rotor model is obtained by theoretical analysis and system identification. The unbalance force response of the bending mode of the rotor is analyzed. The small gain theorem is used to determine the range of the magnitude of the control system. Then, the relationship of the optimum damping varying with the magnitude and phase of the control system nearby the critical speed is analyzed. The run-up experiments are carried out in 315 kW MSM and the results show the effectiveness and superiority of the optimum damping control method.
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active Vibration control of rotor imbalance in active magnetic bearing systems
Journal of Vibration and Control, 2015Co-Authors: Jiancheng Fang, Xiangbo Xu, Jinjin XieAbstract:Rotor imbalance causes undesirable Synchronous Vibrations of displacement, force and torque. An active Vibration control (AVC) method achieving the minimum Vibration force and torque within a desired Vibration displacement is presented in an active magnetic bearing (AMB) system. First, the dynamics of the AMB system with static imbalance and dynamic imbalance are introduced, and the dimensional displacement relationships of the rotation, geometric and inertial axes of the rotor are described. Demands of the AVC are analyzed, and the results indicate that the rotation axis has to be controlled to move along the center line and the inclination direction of the geometric axis and the inertial axis, respectively. Then the Synchronous Vibration displacement is identified with a general notch filter, and a feedforward controller is designed to control the rotation axis by providing a Synchronous control current. A gain phase modifier (GPM) is proposed to achieve a precise Synchronous control current and to comp...
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adaptive complete suppression of imbalance Vibration in amb systems using gain phase modifier
Journal of Sound and Vibration, 2013Co-Authors: Jiancheng Fang, Jiqiang Tang, Hu LiuAbstract:Abstract Synchronous Vibration can be caused by rotor imbalance in high-speed rotors of momentum exchange devices, and the imbalance Vibration is the main disturbance for attitude control of spacecrafts. Active magnetic bearing (AMB) is widely used in momentum exchange devices due to its active Vibration control ability. To suppress the imbalance Vibration completely, an adaptive control approach based on the AMB is proposed. First, dynamics of the AMB rotor with both static imbalance and dynamic imbalance are introduced, and the model of power amplifier is particularly analyzed. Large temperature change range and overpowering cosmic ray will induce considerable errors and variations in parameters of the power amplifier, which has to work in space for about ten years. Therefore, adaptive compensation should be made for these errors and variations. Conditions, on which the imbalance Vibration can be completely suppressed, are analyzed, and the results show that these conditions can be satisfied with notch filters and feedforward compensations (FFCs). However, the FFC contains an inverse function of the power amplifier, whose errors and variations can result in gain and phase differences and changes between the output voltage of the controller and the actual output current of the power amplifier. Consequently, the FFC becomes inaccurate, and residual Vibration occurs. Finally, a gain phase modifier (GPM) is proposed to form two closed loops to tune the gain and phase of the FFC adaptively and precisely. The effectiveness of the proposed approach has been demonstrated by simulations and experiments. Compared with the existing methods, this method can achieve adaptive complete suppression of the imbalance Vibration unaffected by the errors and variations of the power amplifier.
J P Dickey - One of the best experts on this subject based on the ideXlab platform.
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transmission of acceleration from a Synchronous Vibration exercise platform to the head during dynamic squats
Dose-response, 2019Co-Authors: R C Caryn, J P DickeyAbstract:Many research studies have evaluated the effects of whole-body Vibration exercise on muscular strength, standing balance, and bone density, but relatively few reports have evaluated safety issues f...
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transmission of acceleration from a Synchronous Vibration exercise platform to the head
International Journal of Sports Medicine, 2013Co-Authors: R C Caryn, Tom J Hazell, J P DickeyAbstract:Exercise Vibration platforms are becoming commonplace in homes and fitness centers. However, excessive mechanical energy transferred to the head and eye can cause injury. The purpose of this study was to evaluate how changes in platform frequency and knee flexion angle affect acceleration transmission to the head. Participants (N=12) stood on a whole-body Vibration platform with knee flexion angles of 0°, 20°, and 40° to evaluate how changes in knee flexion affected head acceleration. 7 specific platform frequencies were tested between 20–50 Hz at 2 peak-to-peak displacement settings (1 and 2 mm nominal). Accelerations were measured with triaxial accelerometers at the platform and head to generate transmissibility ratios. Platform-to-head transmissibility was not significantly different between the 2 platform peak-to-peak amplitudes (P>0.05). Transmissibility measures varied depending on platform frequency and knee angle (P
Shiqiang Zheng - One of the best experts on this subject based on the ideXlab platform.
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complete Synchronous Vibration suppression for a variable speed magnetically suspended flywheel using phase lead compensation
IEEE Transactions on Industrial Electronics, 2018Co-Authors: Cong Peng, Shiqiang Zheng, Ziyuan Huang, Xinxiu ZhouAbstract:The Synchronous Vibration rising from the magnetically suspended flywheel (MSFW) will drastically reduce the pointing precision of the satellites. In this paper, the high precision suppression for the frequency-varying Synchronous Vibration forces in the permanent-magnet-biased hybrid MSFW is investigated. First, the Synchronous Vibration forces generated in the permanent-magnet-biased hybrid magnetic bearing are modeled and analyzed. Then, a practical and effective Synchronous Vibration suppression method is proposed to plug into the baseline magnetic suspension system. The proposed method ascertains the overall system stability over the entire speed range by an adjustable phase angle. Moreover, it eliminates the residual Synchronous Vibration forces in the negative displacement stiffness by considering phase-lag influence of the power amplifier. The direct testing for the Synchronous Vibration forces proves the feasibility of the proposed suppression method.
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Optimum Damping Control of the Flexible Rotor in High Energy Density Magnetically Suspended Motor
Journal of Engineering for Gas Turbines and Power-transactions of The Asme, 2015Co-Authors: Jiancheng Fang, Enqiong Tang, Shiqiang ZhengAbstract:The rated rotational speed of the magnetically suspended motor (MSM) is always above the bending critical speed to achieve high energy density. The rotor will have a dramatic resonance when it passes the critical speed. Then, the magnetic bearing has to provide large bearing force to suppress the Synchronous Vibration. However, the bearing force is always limited by magnetic saturation and power amplifier voltage saturation. This paper proposed an optimum damping control method which can make effective use of the limited bearing force to minimize the Synchronous Vibration amplitude of the rotor nearby the critical speed. The accurate rotor model is obtained by theoretical analysis and system identification. The unbalance force response of the bending mode of the rotor is analyzed. The small gain theorem is used to determine the range of the magnitude of the control system. Then, the relationship of the optimum damping varying with the magnitude and phase of the control system nearby the critical speed is analyzed. The run-up experiments are carried out in 315 kW MSM and the results show the effectiveness and superiority of the optimum damping control method.
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suppression of imbalance Vibration for ambs controlled driveline system using double loop structure
Journal of Sound and Vibration, 2015Co-Authors: Qi Chen, Shiqiang ZhengAbstract:Abstract Because of the couplings without off-line balancing and the uneven distribution of the rope, the equivalent residual unbalances in the active magnetic bearing (AMB) controlled driveline system are considerable. Therefore it is necessary to achieve suppressing the Synchronous Vibration force over the entire operating speed range. To completely achieve automatic balance of the rotor, a double-loop compensation design approach based on the AMB is proposed. Firstly, a dynamic model of the rotor with imbalance and the decentralized control system of magnetic bearing are established. Then the imbalance characteristic of the rotor system is identified by the generalized notch in which sign of the convergence coefficient needs to be changed according to the rotational speed. Finally, the second loop which is a simply feedforward loop at low speeds and switched to an adaptively tuning loop at high speeds is used to adjust the control current to achieve complete suppression of the imbalance Vibration force. The method can achieve automatic balancing within the entire operating speed range and the effectiveness is unaffected by the attenuation of power amplifier at high speeds. Simulation and experiment results well demonstrate effectiveness of the approach, and the stability of the whole system is guaranteed.
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Vibration Suppression Control for AMB-Supported Motor Driveline System Using Synchronous Rotating Frame Transformation
IEEE Transactions on Industrial Electronics, 2015Co-Authors: Shiqiang Zheng, Rui Feng, Yinxiao JiangAbstract:Synchronous Vibration is an obstacle to the performance improvement of a rotating shaft supported by active magnetic bearings (AMBs). This paper explores a novel autobalancing method for the magnetically suspended rotor in the motor driveline system based on the Synchronous rotating frame (SRF) transformation. The principle and structure of SRF transformation used for the online identification of the physical characteristics of rotor imbalance is given. A modeling and analysis method for the SRF transformation, using complex transfer functions, is presented. The convergence rate and computational complexity compared with the conventional generalized notch filter are further investigated. As well, we conduct the stability analysis of the proposed control system, which is incorporated into the SRF transformation. Simulation and experimental results on a motor driveline system demonstrate a significant effect on the Synchronous Vibration suppression of the magnetically suspended rotor.
Zhiquan Deng - One of the best experts on this subject based on the ideXlab platform.
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a two stage Synchronous Vibration control for magnetically suspended rotor system in the full speed range
IEEE Transactions on Industrial Electronics, 2020Co-Authors: Cong Peng, Mengting Zhu, Kun Wang, Yuan Ren, Zhiquan DengAbstract:The Vibration suppression in the presence of gyroscopic effects is an important issue for safe operations in magnetic bearing levitated varying speed rotor system. This paper proposes a Synchronous Vibration control method with a two-stage notch filter for the magnetically suspended rotor system with strong gyroscopic effects. First, the dynamics of the magnetically suspended rotor system with Synchronous Vibrations in the rotational motion is modeled. Then the proposed two-stage notch filter is designed and the solution of the two-stage switching point is derived to distinguish low speed and high speed. Stability analysis is also presented in the low-speed region and the high-speed region, respectively. Finally, simulation results demonstrate that the stability can be guaranteed by adjusting the phase shift angle of the notch filter over the entire speed range. Further experimental results confirm the effectiveness of the proposed suppression method.
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Vibration Torque Suppression for Magnetically Suspended Flywheel Using Improved Synchronous Rotating Frame Transformation
Hindawi Limited, 2019Co-Authors: Cong Peng, Kaiwen Cai, Zhiquan DengAbstract:Synchronous Vibration, a common issue in active magnetic bearing (AMB) system, is mainly caused by mass imbalance of the rotor. It comes with high-power consumption and serious impact on the housing base, dramatically degrading the performance of AMB. Magnetically suspended flywheel (MSFW), which owns a flat rotor and consequently shows strong gyroscopic effects even at low operating speed, requires additional attention not only for suppressing the Synchronous Vibration but also for maintaining the overall stability faced with the coupled dynamics. In this work, in order to suppress the Vibration torques in MSFW with significant gyroscopic effects, an improved Synchronous rotating frame- (SRF-) based control method is proposed. The proposed method introduces the compensation phase for stability adjustment and aims at simultaneously suppressing the Synchronous components in the coupled axes. Firstly, the Vibration torque model of MSFW is established, and the baseline control strategy for suspension and gyroscopic effects restrain is derived. Then, the principle and implementation of the improved SRF-based Vibration torque method are analyzed, which aims at suppressing the Synchronous Vibration torques through attenuating Synchronous components in coil currents. Moreover, the stability of the overall closed-loop system is analyzed. Finally, the effectiveness of the proposed method is verified through simulation and experimental results
