On active acceleration control of vibration isolation systems |
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| Affiliation: | 1. State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace, Xi’an Jiaotong University, Xi’an 710049, PR China;2. Technology and Engineering Center for Space Utilization, Chinese Academy of Sciences, 100094 Beijing, PR China;1. State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082, PR China;2. Department of Mathematics, University College London, Gower Street, London WC1E 6BT, UK;1. Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hong Kong, PR China;2. School of Aerospace Engineering and Applied Mechanics, Tongji University, Shanghai, PR China;3. Hong Kong Polytechnic University Shenzhen Research Institute, PR China;1. School of Traffic and Transportation Engineering, Central South University, Changsha, Hunan 410075, PR China;2. State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, College of Mechanical and Vehicle Engineering, Hunan University, Changsha, Hunan 410082, PR China;1. Department of Mechanical Engineering, Hong Kong Polytechnic University, H.K. PR China;2. Hong Kong Polytechnic University Shenzhen Research Institute, Shenzhen, PR China;3. The Institute of Sound and Vibration Research, University of Southampton, UK;4. School of Mechanical Engineering, Beijing University of Technology, Beijing, PR China |
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| Abstract: | Active vibration isolation systems (VIS) have been widely used from the space shuttle applications to the ground vehicle suspensions. The main control objective is to achieve the minimum vibrations at the flotor for given vibrations at the stator. With respect to a fundamental limitation of using the PD type flotor acceleration controller, an I (integral) and II (double integral) type flotor acceleration controller is proposed in this paper. By incorporating the feedforward compensation of the umbilical dynamics, the proposed acceleration controller is able to experimentally push down the lowest isolation frequency from 1.4 Hz (when PID control is used) to 0.03 Hz with a sufficiently improved vibration isolation performance up to 10 Hz, with respect to a MIM (Microgravity Vibration Isolation Mount) system tested on the ground. A unique frequency selective filter (FSF) is also proposed, which experimentally suppresses a fixed-frequency umbilical resonant mode at 22.2 Hz with an attenuation of 20 dB. |
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