火箭推进2018，Vol.44Issue(2)：46-54,9.
基于模态法L形工装结构冲击动力学仿真分析
Simulation analysis of impact dynamics of L-shaped fixture based on modal method
摘要
Abstract
L-shaped fixture is used to connect the structure under test to achieve different direction impact and vibration test.The modal frequency,modal shape and modal damping ratio of L-shaped fix-ture fixed to a vibrostand are obtained by a modal test,and then the finite element dynamic model of L-shaped fixture is established and corrected.On this basis,the shock response spectrum(SRS)test of the L-shaped fixture is simulated by modal method,and the further adjustment of the modal damping ratio is made according to the difference between the simulation result and the experimental data.It is found,by means of the comparison between the calculated values of accelerated response and the experimental val-ues of the SRS test in the modified model impact environment,that the modified model can predict the re-sponse of the SRS test accurately.According to the impact simulation analysis of the L-shaped fixture in-stalled in different positions, the conclusions were achieved as follows: it is recommended to move the control point to the subjects structure installation position to avoid over-test and under-test, ensure that the impact response spectrum of the subject structure is consistent with the test condition.关键词
模态法/L形工装/模态阻尼比/冲击响应谱Key words
modal method/L-shaped fixture/modal damping ratio/shock response spectrum分类
航空航天引用本文复制引用
薛杰,许红卫,杜大华,何志勇,李锋..基于模态法L形工装结构冲击动力学仿真分析[J].火箭推进,2018,44(2):46-54,9.基金项目
国家自然科学基金青年基金(11702204),装备预研共用技术和应用基础(2017ZZB-YY4001) （11702204）
