基于FE-SEA方法的卫星部组件随机振动条件研究

卫星部组件的随机振动试验条件确定是较为困难的,通常依据以往试验结果和经验给出。文章尝试应用混合有限元-统计能量分析方法(FE-SEA方法)预示卫星部组件的随机振动环境,以此确定星上部组件的随机振动试验条件。文章首先介绍了该方法的基本理论;随后,用该方法对卫星部组件在星箭界面基础激励和外场声激励联合作用下的加速度响应进行了分析;最后,在综合考虑预示结果和工艺检验要求的基础上,探讨了部组件随机振动条件的确定方法。研究结果表明:FE-SEA方法建模简便,适用于组合载荷作用下的宽频随机振动响应预示,并且,可以较为方便地确定部组件随机振动条件。

Random vibration specification for spacecraft components based on the hybrid FE-SEA method

It is very difficult to specify appropriate random vibration test inputs for spacecraft components, which are usually given in terms of test results or experiences. In this paper, a new technique based on the hybrid FE-SEA method is applied to the prediction of the random vibration environment, and the random vibration as specified by the predictive results is studied. Firstly, the formulation of the hybrid FE-SEA method is briefly discussed. Then, the acceleration power spectral densities for components are computed by the FE-SEA method under the combined loads of the external acoustic loads and the direct mechanical vibration inputs from the interface between the launch vehicle and the spacecraft. Finally, an approach is proposed to specify random vibration test inputs for components in consideration of the predictive results and the technical inspection requirements. It is concluded that FE-SEA is efficient in the modeling work, is especially suitable for the prediction of component responses under combined loads, and is convenient to be applied in specifying the random vibration inputs.