大孔径反射镜组件随机振动响应分析与试验

董得义;;辛宏伟;杨利伟;李志来;关英俊

振动与冲击 ›› 2011, Vol. 30 ›› Issue (11) : 74-78.

PDF(2152 KB)
PDF(2152 KB)
振动与冲击 ›› 2011, Vol. 30 ›› Issue (11) : 74-78.
论文

大孔径反射镜组件随机振动响应分析与试验

  • 董得义1,2 ;辛宏伟1 ;杨利伟1 ;李志来1;关英俊3
作者信息 +

Random vibration analysis and verification for large aperture mirror component

  • Dong De-yi1,2 ; Xin Hong-wei1 ; Yang Li-Wei1 ; Li Zhi-lai1 ; Guan Ying-Jun3
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文章历史 +

摘要

大孔径反射镜的柔性支撑在随机振动试验中应力响应较大,可能产生残余应变进而导致空间光学遥感器成像质量下降,因此,对大孔径反射镜组件进行随机振动响应分析尤为必要。阐述了随机振动分析的基本原理及其有限元实现。建立了反射镜组件的有限元模型,对其进行了随机振动响应分析,得出了反射镜的加速度均方根响应和柔性支撑的均值应力响应。分析结果表明:反射镜加速度响应均方根为16.3Grms;柔性支撑的均值应力响应为34.9MPa。随后进行了随机振动试验验证,结果表明:反射镜组件均方根加速度响应为16.0Grms;均值应力响应为30.3MPa。均方根加速度响应分析误差为1.8%,均值应力分析误差为13.2%,满足精度要求,验证了该方法的正确性。

Abstract

As its stress is usually very high during random vibration, which leads to remained strain causing decrease of imaging quality, random vibration response of large aperture mirror component was analyzed. The theory of random vibration analysis and its finite element implementation were discussed. According to its design feature and stress transfer path, the mirror component’s finite element model was built and its random response was analyzed. The root mean square (RMS) acceleration and cumulative mean square (CMS) stress were obtained. Analysis shows that the RMS acceleration of the mirror is 16.3Grms and the RMS stress of the flexible support is 34.9MPa. Meanwhile, random vibration test was done for verification. Test shows that the mirror’s RMS acceleration is 16.3Grms and the flexible support’s RMS stress is 30.3MPa, indicating the error of 1.8% and 13.2% respectively, which satisfies the accuracy requirements and verifies the validity of presented numerical method.

关键词

大孔径反射镜 / 柔性支撑 / 随机振动 / 试验验证

Key words

large aperture mirror / flexible support / random vibration / test verification

引用本文

导出引用
董得义;;辛宏伟;杨利伟;李志来;关英俊. 大孔径反射镜组件随机振动响应分析与试验[J]. 振动与冲击, 2011, 30(11): 74-78
Dong De-yi;;Xin Hong-wei;Yang Li-Wei;Li Zhi-lai;Guan Ying-Jun. Random vibration analysis and verification for large aperture mirror component[J]. Journal of Vibration and Shock, 2011, 30(11): 74-78

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