The development method of pneumatic impact response spectrum test bench based on design test optimization has the problems of long test cycle and high improvement cost due to insufficient reliability.Finite element analysis can simulate the system impact process in the design stage to shorten the development cycle.In order to meet the shock response spectrum test specifications of a rising slope of 9 dB/Oct,a turning point frequency of 1 000 Hz,and a test magnitude of 4 000 g,a pneumatic shock response spectrum test system was designed in this article.This article first establishes a finite element model of the pneumatic impact response spectrum test bench,and then compares the time-domain and frequency-domain characteristics of the simulated and measured acceleration curves.Finally,it shows that both the simulated and measured acceleration curves exhibit complex attenuation oscillations;The simulated and measured rising slopes are both close to 9 dB/Oct;The simulated inflection point frequency is around 1 080 Hz,and the measured inflection point frequency is around 1 130 Hz.This shock response spectrum test bench can meet the above shock response spectrum test specifications and verify the accuracy of the simulation results.
关键词
冲击响应谱/上升斜率/拐点频率/有限元法
Key words
shock response spectrum/rising slope/inflection point frequency/finite element method
维普
万方数据