统计能量分析参数获取技术的应用

摘要

The hybrid FE-SEA method is widely applied for the mid-frequency mechanical environment predication of spacecraft. But the predication precision of the vibro-acoustic response mainly depends on the SEA parameters, such as the modal density, the damping loss factor and the coupling loss factor. The lack of SEA parameters will make the structure and load design of spacecraft difficult. In this paper, the method for acquiring the SEA parameters is applied. The SEA parameters for several typical structures under different boundary conditions are obtained by tests, which provide plenty of data for the parameter library, as well as provide data for the precise vibro-acoustic response predication of the structure.%目前飞行器高频力学环境预示主要采用有限元-统计能量混合方法,但由于缺乏模态密度、内损耗因子、耦合损耗因子等统计能量分析参数,导致声振响应预示结果不够准确,给结构和载荷设计带来了困难.文章将已有的统计能量参数获取技术应用于工程实际,通过试验获取了几种典型结构在不同安装边界下的统计能量分析参数,积累了相关的数据,为结构的精细化声振响应预示提供了输入.