Abstract: 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

Key words: optical path switching assembly, random vibration, spectral density response, spectral shape parameters, finite element method