统计能量分析参数获取技术的应用  

Application of the method for acquiring SEA parameters

作　　者：秦朝红[1] 任方[1] 张忠[1] 刘振皓[1] 原凯[1] 肖健[2] 张鹏飞[2] QIN Zhaohong;REN Fang;ZHANG Zhong;LIU Zhenhao;YUAN Kai;XIAO Jian;ZHANG Pengfei(Science and Technology on Reliability and Environment Engineering Laboratory,Beijing Institute of Structure and Environment Engineering;Beijing Institute of Structure and Environment Engineering: Beijing 100076, China)

机构地区：[1]北京强度环境研究所可靠性与环境工程技术重点实验室 [2]北京强度环境研究所,北京100076

出　　处：《航天器环境工程》2017年第1期8-14,共7页Spacecraft Environment Engineering

基　　金：国家自然科学基金项目(编号:11402028,1150203,11502024)

摘　　要：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。The hybrid FE-SEA method is widely applied for the mid-frequency mechanical environmentpredication of spacecraft.But the predication precision of the vibro-acoustic response mainly depends on theSEA parameters,such as the modal density,the damping loss factor and the coupling loss factor.The lack ofSEA parameters will make the structure and load design of spacecraft difficult.In this paper,the method foracquiring the SEA parameters is applied.The SEA parameters for several typical structures under differentboundary conditions are obtained by tests,which provide plenty of data for the parameter library,as well asprovide data for the precise vibro-acoustic response predication of the structure.

关 键 词：统计能量分析 模态密度 内损耗因子 耦合损耗因子 

分 类 号：O32[理学—一般力学与力学基础] O235[理学—力学]