三单元细化准则在随机振动分析中的应用

Analysis on Random Vibration Response for Electronic Equipment of Satellite

从弹性波波动理论出发,提出了一种新的有限元网格细化准则——三单元细化准则,可以解释模态数细化准则实施过程中出现的模态数突变现象。对于以封闭式盒段组合结构为特征的卫星电子设备,讨论了其有限元模型的简化建模方法。利用三单元细化准则,验证了某卫星电子设备随机振动加速度响应的NASTRAN软件分析结果满足工程计算精度的要求。

According to the elastic wave motion theory, a new finite element mesh size criterion called three-element mesh size criterion （TMSC） is presented. TMSC can explain the abrupt change of mode number existing in the implementation of mode number mesh size criterion （MNMSC）. The discussions of the simplified finite element modeling method of the satellite electronic equipments with closed box segment combination structure are given. It is verified that the NASTRAN numerical results of random vibration acceleration response of the electronic equipments of satellite by using TMSC satisfy the requirement of engineering calculation precision.