The Experts below are selected from a list of 17907 Experts worldwide ranked by ideXlab platform
Fengming Li - One of the best experts on this subject based on the ideXlab platform.
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Recent advances in micro-Vibration Isolation
Mechanical Systems and Signal Processing, 2015Co-Authors: Chunchuan Liu, Xingjian Jing, Steve Daley, Fengming LiAbstract:Micro-Vibration caused by disturbance sources onboard spacecraft can severely degrade the working environment of sensitive payloads. Some notable Vibration control methods have been developed particularly for the suppression or Isolation of micro-Vibration over recent decades. Usually, passive Isolation techniques are deployed in aerospace engineering. Active isolators, however, are often proposed to deal with the low frequency Vibration that is common in spacecraft. Active/passive hybrid Isolation has also been effectively used in some spacecraft structures for a number of years. In semi-active Isolation systems, the inherent structural performance can be adjusted to deal with variation in the aerospace environment. This latter approach is potentially one of the most practical Isolation techniques for micro-Vibration Isolation tasks. Some emerging advanced Vibration Isolation methods that exploit the benefits of nonlinearity have also been reported in the literature. This represents an interesting and highly promising approach for solving some challenging problems in the area. This paper serves as a state-of-the-art review of the Vibration Isolation theory and/or methods which were developed, mainly over the last decade, specifically for or potentially could be used for, micro-Vibration control.
Yao Zhang - One of the best experts on this subject based on the ideXlab platform.
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A novel Vibration Isolation system for reaction wheel on space telescopes
Acta Astronautica, 2014Co-Authors: Yao Zhang, Zixi Guo, He Huidong, Jingrui Zhang, Min Liu, Zhicheng ZhouAbstract:Abstract A reaction wheel (RW) is commonly used as an actuator for attitude control on space telescopes. The RW can also produce tonal disturbances and broadband noises when the wheel spins. In this work, a novel Vibration Isolation system is proposed to attenuate the disturbances caused by the RW. This novel Vibration Isolation system includes a multi-strut Vibration Isolation platform and multiple tuned-mass dampers, and each strut of the Vibration Isolation platform includes a negative stiffness structure in parallel with a positive stiffness structure. This study aims to validate the feasibility and effectiveness of this new Vibration Isolation system from a theoretical perspective. First, the integrated satellite dynamic model is constructed, including the RWs and the Vibration Isolation systems. Next, its frequency domain characteristics are described, and the application of the Vibration Isolation system for RWs is presented. Finally, the effective attenuation of RW disturbances is illustrated via the new Vibration Isolation system, and its safety performance is verified with numerical simulations.
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Vibration Isolation Platform with Multiple Tuned Mass Dampers for Reaction Wheel on Satellites
Mathematical Problems in Engineering, 2013Co-Authors: Yao Zhang, Jingrui Zhang, Zhai GuangAbstract:Vibration Isolation is a direct and effective approach to improve the ultraprecise pointing capability of an imaging satellite. To have a good trade-off between the resonance amplitude and the high frequency attenuation for the original Vibration Isolation platform, a novel Vibration Isolation system for reaction wheel (RW), including a multistrut Vibration Isolation platform and multiple tuned mass dampers, is proposed. The first step constructs the integrated satellite dynamic model including the RWs and the Vibration Isolation systems, while the static and dynamic imbalances of the rotor and base movements are considered in the modeling process. The transmissibility matrix of the Vibration Isolation system is then obtained, and its frequency domain characteristics are described. The third part presents the application of the Vibration Isolation system for RWs. The effective attenuation of RW disturbances by the new Vibration Isolation system is illustrated, and its safety performance is also verified. Finally, using the reasonable parameters of the Vibration Isolation system, its performance on the satellite is testified by numerical simulations. The study shows that the novel Vibration Isolation system presented cannot only be successfully applied to a satellite but also improve the attitude stability.
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Vibration Isolation Platform for Control Moment Gyroscopes on Satellites
Journal of Aerospace Engineering, 2012Co-Authors: Yao ZhangAbstract:AbstractThe Vibration Isolation platform of control moment gyroscopes (CMGs) on satellites is discussed. First, the theory of single-axis Vibration Isolation is presented and an Isolation scheme for CMGs is put forward and applied to a satellite, which can provide an ultraquiet environment for optical payloads. Second, an integrated satellite dynamic model including the Vibration Isolation platform and pyramid configuration of the CMGs is built. The validity of this dynamic model is then verified by ADAMS. Third, the influence of the Vibration Isolation system on the attitude control system of the satellite is analyzed in detail and the appropriate parameters of the proportional-integral-derivative (PID) controller are selected. Finally, the attitude stabilization performance with the Vibration Isolation system is predicted by integrated simulation. The analysis and simulation results show that the Vibration Isolation platform can attenuate the disturbances to a certain extent—thus, improving the attitude...
Chunchuan Liu - One of the best experts on this subject based on the ideXlab platform.
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Recent advances in micro-Vibration Isolation
Mechanical Systems and Signal Processing, 2015Co-Authors: Chunchuan Liu, Xingjian Jing, Steve Daley, Fengming LiAbstract:Micro-Vibration caused by disturbance sources onboard spacecraft can severely degrade the working environment of sensitive payloads. Some notable Vibration control methods have been developed particularly for the suppression or Isolation of micro-Vibration over recent decades. Usually, passive Isolation techniques are deployed in aerospace engineering. Active isolators, however, are often proposed to deal with the low frequency Vibration that is common in spacecraft. Active/passive hybrid Isolation has also been effectively used in some spacecraft structures for a number of years. In semi-active Isolation systems, the inherent structural performance can be adjusted to deal with variation in the aerospace environment. This latter approach is potentially one of the most practical Isolation techniques for micro-Vibration Isolation tasks. Some emerging advanced Vibration Isolation methods that exploit the benefits of nonlinearity have also been reported in the literature. This represents an interesting and highly promising approach for solving some challenging problems in the area. This paper serves as a state-of-the-art review of the Vibration Isolation theory and/or methods which were developed, mainly over the last decade, specifically for or potentially could be used for, micro-Vibration control.
Xuezeng Zhao - One of the best experts on this subject based on the ideXlab platform.
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Design and analysis of a GMM actuator for active Vibration Isolation
2015 IEEE International Conference on Mechatronics and Automation (ICMA), 2015Co-Authors: Xuezeng ZhaoAbstract:Vibration Isolation system is always required to reduce the affected interference in a very short time. More specifically, the high-frequency interference can be effectively reduced by means of passive Vibration Isolation, while low-frequency interference needs prevent inhibition by applying active Vibration Isolation. The key components of active seismic Isolation system include sensor and actuator, among which the actuator will obtain a sound Vibration Isolation effect only if larger output force and faster response speed are acquired. In this paper, a giant magnetostrictive actuator is designed; the performance parameters and dynamic hysteresis response characteristics are analyzed.
Jinsiang Shaw - One of the best experts on this subject based on the ideXlab platform.
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Active Vibration Isolation by adaptive control
JVC Journal of Vibration and Control, 2001Co-Authors: Jinsiang ShawAbstract:In this paper, an adaptive controller known as a self-tuning regulator (STR) is employed for active Vibration Isolation. Numerical simulation of the developed STR for active Vibration Isolation of a simple two- degree-of-freedom mechanical system subject to external disturbances is carried out. Experimental studies of Vibration Isolation using a magnetostrictive actuator with Terfenol-D rod are also presented. Both studies demonstrate the validity and effectiveness of the STR for active Vibration Isolation when the system is dis turbed by an unknown source. The unknown disturbance in the study includes a pure harmonic, a two-mode harmonic, a normally distributed random noise, and a band-limited random noise. In addition, a comparative study of the STR with a previously developed plant disturbance canceler (PDC) for active Vibration Isolation is conducted. Performance of the STR is shown to be superior to that of the PDC in both the numerical and experimental investigations.
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Active Vibration Isolation by adaptive control
Proceedings of the 1999 IEEE International Conference on Control Applications (Cat. No.99CH36328), 1999Co-Authors: Jinsiang ShawAbstract:An adaptive controller known as the self-tuning regulator (STR) is employed for actively controlling an actuator for Vibration Isolation. Numerical simulations of the developed STR for active Vibration Isolation of a simple mass-spring-damper system of two-degree-of-freedom subject to external disturbances are carried out. Experimental studies of Vibration Isolation by using a magnetostrictive actuator with a Terfenol-D rod are also presented. Both studies demonstrate the validity and effectiveness of the STR for active Vibration Isolation when the system is disturbed by a pure harmonic, two-modes harmonic, random, or even band-limited white noise excitation. In addition, the results are shown to be superior in terms of faster convergence and more Vibration attenuation to those obtained by using a previously developed adaptive plant disturbance canceler.