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Design and optimization of the micro-vibration isolation system for large space telescope
Journal of Sound and Vibration ( IF 4.7 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.jsv.2020.115461
Chao Qin , Zhenbang Xu , Mingyi Xia , Shuai He , Jingxu Zhang

Abstract With increasing demands for better image quality, the aperture and size of a space telescope are becoming larger, and stability requirements are becoming more stringent. To reduce the influence of micro-vibrations on image quality from telescope platform, isolating vibrations of the whole telescope optical payload must be taken into account. To this end, a method to design and optimize a vibration isolation system (VIS) was developed. A dynamic model coupling the telescope optical payload and the platform in orbit was established to assist in the design and optimization of a configuration for the VIS, the objective being to minimize the frequency bandwidth of the integral modes of the telescope optical payload. Isolators with multidirectional elasticity were designed, and the frequency bandwidth of the integral modes was further narrowed by optimizing the structural parameters of the isolators. A viscous fluid damper was designed to suppress the VIS's resonance modes and its damping coefficients tested. Moreover, a micro-vibration integrated optomechanical analysis model was established. The influence of micro-vibration on line-of-sight of a space telescope with VIS was analyzed. The simulation results in the time and frequency domain show that the designed VIS can effectively attenuate the micro-vibrations transmitted to the telescope optical payload.

中文翻译:

大空间望远镜微隔振系统设计与优化

摘要 随着对更好图像质量的要求越来越高,空间望远镜的口径和尺寸越来越大,稳定性要求也越来越严格。为了减少微振动对望远镜平台图像质量的影响,必须考虑整个望远镜光学有效载荷的振动隔离。为此,开发了一种设计和优化隔振系统 (VIS) 的方法。建立了一个耦合望远镜光学有效载荷和在轨平台的动力学模型,以协助设计和优化 VIS 的配置,目的是最小化望远镜光学有效载荷积分模式的频率带宽。设计了具有多向弹性的隔离器,通过优化隔离器的结构参数,进一步缩小了积分模式的频带宽。设计了一个粘性流体阻尼器来抑制 VIS 的共振模式及其阻尼系数测试。此外,建立了微振动集成光机械分析模型。分析了微振动对可见光空间望远镜视距的影响。时域和频域的仿真结果表明,所设计的VIS可以有效地衰减传输到望远镜光学有效载荷的微振动。分析了微振动对可见光空间望远镜视距的影响。时域和频域的仿真结果表明,所设计的VIS可以有效地衰减传输到望远镜光学有效载荷的微振动。分析了微振动对可见光空间望远镜视距的影响。时域和频域的仿真结果表明,所设计的VIS可以有效地衰减传输到望远镜光学有效载荷的微振动。
更新日期:2020-09-01
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