小卫星非常规动力学分析与控制

Research on unconventional dynamic problems for small satellites

针对小卫星研制中出现的一些非常规动力学问题进行研究,并提出解决办法。针对小卫星组件最大冲击谱量级超出常规冲击试验规范谱的分析与验证困难,通过研究提出了能够分析评估组件高量级冲击的方法。针对小卫星随机振动下强度设计方法还存在较大误差,分析了系统模态质量比与模态频率在一定频段的影响规律,认为忽略模态质量耦合会带来误差,提出了考虑模态质量耦合的准静态载荷计算方法。最后,针对小卫星整星开展了减振研究,分析了正弦和随机减振效果,对于对称安装减振系统,提出了减振系统的主频率计算公式。

Some special dynamic problems encountered in small satellites were studied, and the corresponding solutions were developed. To solve the difficulties of analysis and test for high level shock much higher than the frequently-used shock test standard spectrum, a method was proposed to analyze the high level shock. As for problems in strength design under random vibration for small satellites, the influence of the modal effective mass ratios and modal frequencies on quasi-static load computation was studied. The analysis shows that neglecting the coupling of modal effective masses and the coupling of modal frequencies leads to large error in quasi-static load computation under random vibration. The method for quasi-static load computation with consideration of the coupling of modal effective masses was proposed. Finally, the study on vibration reduction was carried out for a small satellite, and the vibration reduction for sine vibration and random vibration was analyzed. The calculation method of the main frequency for vibration reduction system with symmetrical installation was given.