Simultaneous Precision Positioning and Vibration Control for on-Orbit Optical Payloads: An Integrated Actuator Developme
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ORIGINAL PAPER
Simultaneous Precision Positioning and Vibration Control for on‑Orbit Optical Payloads: An Integrated Actuator Development and Analysis Xiaoqing Sun1 · Bintang Yang2 · Wei Hu3 · Zhuan Bai1 Received: 7 August 2020 / Revised: 29 August 2020 / Accepted: 2 September 2020 © Krishtel eMaging Solutions Private Limited 2020
Abstract Background A lot of efforts have been devoted to the instrument development of simultaneous precision positioning and vibration control for on-orbit optical payloads. However, only series schemes with two active elements which, in fact, are coarse and fine hybrid mechanisms, are researched in despite of adverse impacts on the whole mass and dimensions, control strategy and energy usage. Thus, a new magnetostrictive integrated actuator with just one single active element is proposed to realize those two functions together. Methods The detailed scheme is introduced, and the selection of some key parameters are explained first. Then, the explicit expressions are derived and the performances are preliminarily studied by numerical simulations. Finally, a prototype is fabricated, and experimental tests are carried out in view of external disturbances with different frequencies. Conclusions The results indicate that the developed actuator can not only actively control the low-frequency disturbances but also can passively suppress the middle-high frequency micro-vibrations during precision positioning. Keywords On-orbit optical payloads · Giant magnetostrictive actuator · Precision positioning · Vibration control · Compliant mechanism
Introduction Although the on-orbit optical payloads have grown exponentially due to the evolution of various new techniques in recent years, the realization of higher observation precision still presents itself as a major challenge for current engineering [1]. On the one hand, it means that its driving component should possess a high positioning accuracy for aligning the target. On the other hand, as to the undesirable micro-vibrations such as the ultra-low frequency disturbances from flexible appendages and the middle-high frequency harmonic disturbances from control moment gyroscopes (CMG), flywheels, etc., it also should have potential to control for reducing image jitters [2–5]. Nowadays, a compact driving * Xiaoqing Sun [email protected] 1
Department of Mechanical Engineering, Donghua University, Shanghai 201620, China
2
State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University, Shanghai 200240, China
3
Shanghai Aerospace Control Technology Institute, Shanghai 201109, China
component that can realize those two functions simultaneously is eagerly desired with the development trend of miniaturization and integration of the optical payloads [6]. Thus, the development of such driving component that we name integrated actuator is very important. The conception of simultaneous positioning and vibration control is initially proposed from engineering control-theoretic perspective. Prof. Ma and Ghasemi-Nejhad
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