星载光谱仪光路切换组件振动特性仿真分析

Simulation analysis for vibration characteristics of optical path switching assembly of space-borne spectrometer

为研究星载设备在复杂力学环境下的振动响应特性,利用有限元分析软件对光谱仪光路切换组件进行仿真分析。首先根据星上载荷的力学环境试验条件,通过谱形参数计算方法建立星上载荷输入谱密度激励曲线图。随后,对光路切换组件进行模态分析和随机振动分析,得到激励谱条件下组件的振动响应结果和最大等效应力。强度校核计算结果显示组件安全裕度为1.57,满足刚度和强度要求。最后,对整机振动进行试验验证,验证结果显示组件结构完好,且光学性能比照试验结果显示振动前后,三个通道的卤素灯图像的成像范围、光谱强度特性等基本一致,光路切换组件无异常变化,验证了仿真分析的可靠性。

In order to study the vibration response characteristics of space-borne equipment in complex mechanical environment,simulation analysis of the optical path switching assembly is carried out by using finite element analysis software.Firstly,according to the mechanical environment of onboard load,the excitation curve of the input spectral density of onboard load is established through the calculation method of spectral shape parameters.Then,the modal analysis and random vibration analysis of the optical path switching assembly are carried out,and the vibration response results and the maximum equivalent stress of the assembly are obtained under the excitation spectrum condition.The calculation results of strength check show that the safety margin is 1.57,which meets the requirements of stiffness and strength.Finally,the vibration of the whole machine is tested and verified.The verification results show that the structure of the module is in good condition,and the optical performance comparison test results show that the imaging range and spectral intensity characteristics of the three channels of the halogen lamp are basically the same before and after the vibration,and the optical path switching components have no abnormal changes,which verifies the reliability of the simulation analysis.