基于刚挠背板的模态分析与抗振优化设计

研究了通信整机中刚挠背板互联结构的动态特性,并对其进行了抗振优化设计.在有限元软件中建立模型,通过模态分析获得其固有频率和振型,找出抗振薄弱环节;采用多种优化方法进行抗振优化设计.结果表明,刚挠背板互联结构的一阶固有频率为188Hz,振型主要为刚性背板部分的弯折变形及挠性部分的弯折扭曲,刚性背板部分及刚挠接口属薄弱环节;采用带加强筋的加强铝板对刚性背板进行抗振优化,可显著降低背板振幅,提高固有频率;改变安装方式,增加紧固点,整体一阶固有频率可升至1 179Hz,显著提高其抗振性.

Modal Analysis and Anti-vibration Optimization Based on Rigid-Flex Backplane

Dynamic characteristic of the rigid-flex backplane interconnect structure was studied and anti-vibration optimization was completed.The finite element analysis model(FEM) was set up.To find the weak-areas on vibration resistance,the fundamental resonant frequency and vibration modes were obtained through modal analysis.Several optimal methods were used to anti-vibration optimization.The results of this study show that one-step fundamental resonant frequency of this structure is 188Hz.The modes of vibration are mainly the bending of the rigid part and the twisting of the flexible part.The rigid part and the interface of the rigid and the flexible one are weak-areas.The rigid backplane part was optimized by using aluminum sheet with reinforcing rib,so that the amplitude of vibration may be lowered significantly and the fundamental resonant frequency be risen.One-step natural frequency reached 1 179Hz by changing the method of installation and adding restriction points,which can increase the vibration resistance.