The vibration fixture is designed to meet the vibration test requirements of cool planet imaging coronagraph in space survey telescope.Firstly,the modal simulation calculation was carried out for the preliminary design of the vibration fixture.According to the modal analysis results,the weaknesses were identified and the design of vibration fixture was improved.By analysis calculation,the fixture after design improvement can meet the design requirement of frequency.Then the sinusoidal vibration and random vibration dynamics were analyzed.Sinusoidal sweep test of the fixture was carried out on the shaking table in order to verify the rationality of the design.The first-order mode simulation result of fixture is 342.6 Hz,and the first-order mode of vibration test analysis is 329 Hz.There was an error of 4％between the natural frequency test result of the fixture and simulation calculation.The simulation results are verified by experiments.The objective is attained for the fundamental frequency of the vibration fixture is 3 times greater than the tested object,and the design of vibration fixture is reasonable.The fixture can meet the requirements of mechanical environment test of the cool planet imaging coronagraph for space survey telescope.
关键词
夹具设计/模态分析/正弦振动/随机振动/振动试验
Key words
fixture design/modal analysis/sinusoidal vibration/random vibration/vibration test
维普
万方数据