Design of a Vibration Isolation System for the Space Telescope

Yang, Jianfeng; Xu, Zhenbang; Wu, Qingwen; Wang, Zhongsu; Li, Hang; He, Shuai

doi:10.2514/1.g001221

Cited by 21 publications

(7 citation statements)

References 33 publications

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“…Some similar active vibration isolation systems have been developed within recent years, 24 including STABLE, 25 g-LIMIT, 26 MIM and MIM-2, 27 MVIS, 28 and ARIS, 29 that have been tested on MSL, Space Shuttle, or ISS. Other space optical systems, 30,31 such as SUITE, 32 VISS, 33 and DFP, 34 also used similar technology for low-frequency mechanical vibration control.…”

Section: Methodsmentioning

confidence: 99%

Microgravity disturbance analysis on Chinese space laboratory

et al. 2019

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Many scientific experiments are conducted in space; therefore, it is critical to understand the microgravity environment of a space laboratory. The first Chinese cargo ship, Tianzhou-1 (TZ-1), entered space on 20 April, 2017 and later joined with the Tiangong-2 (TG-2) Chinese space laboratory. TZ-1 carried a high-precision electrostatic suspension accelerometer system (ES-ACC) for measuring the microgravity acceleration on the spacecraft and a microgravity-active vibration system (MAIS), which contained flexible quartz accelerometers (Q-ACC). The ES-ACC was able to provide a reduced-disturbance environment for the MAIS. The purpose of these two instruments was to validate novel technologies and as an opportunity to record the microgravity acceleration of TZ-1 and TG-2 in detail during spacecraft operation in different flight modes, with or without vibration isolation. The acceleration data were analyzed comprehensively in a time–frequency–amplitude spectrogram. Some periodical disturbances with orbital period and irregular signals related to certain in-orbit events were observed. After reducing those disturbances, the microgravity levels on TZ-1 and TG-2 could be resolved to better than 10 −6 m/s 2 in the root mean square in the frequency of 0.01–10 Hz. These accurate measurements aboard the Chinese space laboratory will provide valuable information to optimize working conditions for scientific experiments.

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Section: Methodsmentioning

confidence: 99%

Microgravity disturbance analysis on Chinese space laboratory

et al. 2019

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“…It leads to the dynamic characteristics of lower frequencies and lower attenuations for these appendages (Hu, 2012). The long-term continuous vibration of appendages may easily lead to fatigue and affect the performance of high-precision payloads (Cao and Hang, 2020; Dong et al, 2018; Yang et al, 2015). Thus great attentions have been paid to the dynamic features of these appendages, for example, natural frequencies, modal damping, modal vectors, coupling coefficients, and so forth, not only during the design stage on the ground (Boni et al, 2017; Ha et al, 2013; Ha et al, 2015), but also during the working stage on the orbit.…”

Section: Introductionmentioning

confidence: 99%

Configuration optimization of photogrammetry system based on spectral radius for on-orbit measurement

Wang

Pan²,

et al. 2021

Transactions of the Institute of Measurement and Control

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Non-contact optical measurement is a potential approach to on-orbit vibration measurement for flexible appendages, providing dynamic information for spacecraft control system. Binocular photogrammetry system is a practical configuration to achieve this measurement. In this paper, optimization approach and strategy for configuration parameters of this system are raised. Measurement matrix is specially defined to obtain the objective function for the optimization. Successive linear programming algorithm is used for optimization iteration. Transient responses of flexible appendages calculated by finite element model and corresponding images generated by OpenGL help to achieve this simulation-based optimization. The feasibility and effectiveness of the optimization are verified both by numerical study and experiment. Error analysis of the optimal system reveals great improvement in accuracy and robustness after optimization. This optimization is a promising approach to designing the configuration of binocular photogrammetry system and helping to achieve reliable on-orbit dynamic measurement results.

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“…[8][9][10] Passive vibration isolation is often used because of the issues such as reliability and low maintenance cost. [11][12][13][14] Owing to the large aperture, space limitations in the launch vehicle, and deployment mechanism, the TALC is bound to be more flexible than the previous telescopes. TALC comprises long cables in the vacuum and long masts that are not easily passively damped in the vacuum.…”

Section: Introductionmentioning

confidence: 99%

Dynamic stabilization of thin aperture light collector space telescope using active rods

Verma

Pece

Hellegouarch

et al. 2020

J. Astron. Telesc. Instrum. Syst.

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Thin aperture light collector (TALC) is the next generation of telescopes for space exploration. TALC consists of deployable annular segmented mirrors supported on a central mast with the help of cables. The dynamic stability of the telescope is of immense importance in order to make sure that the telescope is pointing in the right direction during the observation period. We present a control strategy for the dynamic stabilization of the segmented TALC structure using active rods. The active rods consist of collocated pairs of piezoelectric stack actuators and sensors. Decentralized integral force feedback is proposed to enhance the dynamic stability of the TALC. The effectiveness of the strategy is demonstrated on a 1/10th scaled mock-up model of the TALC. For numerical investigation, finite element analysis of the TALC is carried out and a reduced order model is extracted using the Craig-Bampton method. This reduced order model is then used for the design and numerical validation of the controller. Experiments are conducted on the mock-up model of the TALC to evaluate the performance of the proposed strategy. It is found that the proposed strategy is quite effective for dynamic stabilization of TALC. It is found to reduce both steady state and transient responses of the TALC.

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Design of a Vibration Isolation System for the Space Telescope

Cited by 21 publications

References 33 publications

Microgravity disturbance analysis on Chinese space laboratory

Microgravity disturbance analysis on Chinese space laboratory

Configuration optimization of photogrammetry system based on spectral radius for on-orbit measurement

Dynamic stabilization of thin aperture light collector space telescope using active rods

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