摘要
为了研究某种空间遥感器调焦机构组件的动特性,对其进行了锤击法模态试验。通过采用有限元分析软件MSC/NASTRAN对空间遥感器调焦机构组件进行模态分析,得到了空间遥感器调焦机构组件的低阶固有振动频率和主振型。对空间遥感器调焦机构组件试验模态与计算模态进行了对比,并进行了相关性分析和评估。通过空间遥感器调焦机构组件试验模态与计算模态的对比可知:前四阶的固有频率相对误差均在5%以内;模态置信准则判据(MAC)的值均在0.95左右;模态贡献因子(MPF)的值均在0.9左右。说明空间遥感器调焦机构组件计算模态与试验模态具有比较好的相关性,有限元模型比较准确地反映了实际的空间遥感器调焦机构组件的动特性,并为空间遥感器调焦机构的进一步设计提供了依据。
The finite-element method （FEM） and modal analysis are used for vibration prediction in space remote sensor domains. In order to get the dynamic performance on the focusing mechanism component of the space remote sensor, the analysis of FEM modal are compared with the test modal analysis. The correlations of the tested and calculated modes of the focusing mechanism component are studied. Compare on the tested and calculated modes shows that the first four nature frequencies are within 5%. It shows that the MAC are about 0.95, and the MPF are about 0.9. The final correlation is satisfactory, and the finite element model of the focusing mechanism component can be used in the design of focusing mechanism systems.
出处
《光学技术》
CAS
CSCD
北大核心
2009年第2期235-238,243,共5页
Optical Technique
基金
国家863计划资助项目(863-2-5-1-13B)
关键词
空间遥感器
调焦机构
模态分析
相关性分析
有限元分析
space remote sensor
focusing mechanism component
modal analysis
finite dement analysis
