基于正交试验的弹载电子设备机箱抗振性研究

The vibration analysis of the aerospace electronic equipment cabinet based on orthogonal test

为了提高弹载电子设备的工作性能和可靠性,本文通过正交试验设计与有限元仿真分析相结合的方法,分别从模态分析和随机振动响应分析两个方面探究弹载设备机箱结构设计参数对结构抗振性能的影响,为弹载电子设备抗振性设计提供了基础。结果表明:1)在六个设计参数中,材料弹性模量和印制板连接钉个数是结构固有频率的显著影响因子;长宽比、材料弹性模量和印制板连接钉个数是随机振动加速度响应的显著影响因子;2)对于结构固有频率而言,印制板连接钉个数影响最大,在分析水平范围内,结构固有频率随连接钉个数变化呈递增趋势;对于加速度响应而言,长宽比影响最大;在分析水平范围内,加速度响应随长宽比变化呈递减趋势。

To improve the performance and reliability of the aerospace electronic equipment,this paper investigated how equipment design parameters influence the structural seismic performance from2aspects respectively:modal analysis and random response analysis.Two approaches,orthogonal experimental design and finite element simulation,were applied to this research,which made more reference for aerospace electronic equipment design work.Two key conclusions are:The elasticity modulus of materials and the number of connecting screws make major impact on natural frequency of the electronic equipment cabinet;for the acceleration response of the electronic equipment cabinet,the major impact factors are elasticity modulus of materials,number of connecting screws,length-to-width ratio.In the modal analysis,we see,natural frequency of the electronic equipment cabinet shows a rising trend with the increasing of number of connecting screws,which is the biggest influencing factor;from random response analysis,the acceleration response shows a descending trend with the increasing of length-to-width ratio,which is the biggest influencing factor.