微尺度力敏器件力学特性及随机响应抑制研究

李林; 王晓燕; 钟俊; 隋杰; 刘婧; 陈建峰; 左富昌

doi:doi:10.3788/ope.20192707.1561

光学精密工程, 2019, 27 (7): 1561, 网络出版: 2019-09-02

微尺度力敏器件力学特性及随机响应抑制研究

Study on mechanical properties and random response suppression of micro-scale mechanical-sensitive component

论文大纲

李林王晓燕钟俊隋杰刘婧陈建峰左富昌

作者单位

北京控制工程研究所, 北京 100190

微尺度精细化建模随机响应光学仪器力敏器件振动抑制 micro-scale fine modeling random response optical instrument mechanical-sensitive component

摘要

针对空间站用光学仪器上微尺度力学敏感器件随机振动响应值过大的问题, 对该器件进行微尺度、精细化建模, 研究其力学特性, 并对其随机响应采取有效抑制措施。首先, 探讨了微尺度模型边界协调和微尺度有限元变分问题, 根据微尺度结构特点, 建立4种模型, 在整机中进行系统级随机振动仿真分析, 研究了4种模型微尺度结构的力学特性。接着, 在分析比较随机加速度响应值、位移响应值与应力响应值的基础上, 对力敏器件微尺度建模方法进行了深入讨论。然后, 对力学敏感器件采取了随机响应抑制措施, 并进行了仿真分析。最后, 对该光学仪器进行了力学试验、热试验和测试试验。结果表明, 该光学仪器功能正常, 微尺度结构随机加速度响应RMS值最大降低42.4%, 随机应力响应降低均在20%以上, 应力安全裕度均远大于零; 仿真与试验加速度响应结果最大相对误差均在10%以内。证明了所提出的微尺度结构截面四单元建模方法精准、可靠。

Abstract

To solve the problem of excessive random vibration response of a micro-scale mechanical-sensitive component of an optical instrument for a space station, micro-scale and fine modeling of the component was conducted, its mechanical properties were studied, and effective measures were adopted to suppress its random response. First, the boundary coordination of the micro-scale model and the variation problem of the micro-scale finite element were discussed. On this basis and according to the characteristics of the micro-scale structure, four models were established. A system-level random vibration simulation was performed, and the characteristics of the four micro-scale models were studied. Following analysis and comparison of the random response, including the acceleration, displacement, and stress, the micro-scale modeling method was discussed in-depth. Then, random vibration response suppression and a simulation were separately conducted. Finally, mechanical and thermal tests and a testing experiment were performed. Results reveal that the optical instrument has normal functions, the root mean square of the acceleration response of the micro-scale structure is reduced by 42.4%, the stress is reduced by more than 20%, and the stress safety margin is far greater than zero. The maximum relative error of acceleration response for the simulation and test is within 10%. The study thus showes that the proposed four-element modeling method for a cross-section of a micro-scale structure is accurate and reliable.

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李林, 王晓燕, 钟俊, 隋杰, 刘婧, 陈建峰, 左富昌. 微尺度力敏器件力学特性及随机响应抑制研究[J]. 光学精密工程, 2019, 27(7): 1561. LI Lin, WANG Xiao-yan, ZHONG Jun, SUI Jie, LIU Jing, CHEN Jian-feng, ZUO Fu-chang. Study on mechanical properties and random response suppression of micro-scale mechanical-sensitive component[J]. Optics and Precision Engineering, 2019, 27(7): 1561.

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