在时域中单独利用响应数据进行模态分析  

Time-domain Modal Analysis from Response-only

作　　者：郑敏[1] 申凡[2] 鲍明[2] 

机构地区：[1]南京航空航天大学民航学院,南京市210016 [2]南京航空航天大学振动工程研究所

出　　处：《中国机械工程》2003年第5期399-402,共4页China Mechanical Engineering

基　　金：航空工业总公司"九五"规划项目 ( 62 .2 .2 .1)

摘　　要：对于工程中的一些大型结构 ,很难测得激励信号 ,这时就只能单独利用实测响应数据对结构进行动态特性分析。针对这一情况 ,推导出互相关复指数法和互相关差分模型两种多参考点时域法 ,然后将它们应用于一飞机模型进行模态识别。试验结果表明 ,互相关复指数法比互相关差分模型能够更精确地单独从实测响应数据提取结构的模态参数。It is very difficult for some large-scale structures to measure excitation, so the dynamic characteristics must be analyzed from measured response-only. Two kinds of poly-reference time-domain modal identifications including complex exponential method and difference model with cross-correlation functions are derived in this paper. Then an experiment on an aircraft model is carried out to verify the validity of the proposed methods. And the results show that the proposed complex exponential method is more accurate than the proposed difference model for the modal identification from response-only.

关 键 词：机械振动 模态识别 工作状态 时域分析 

分 类 号：TH113.1[机械工程—机械设计及理论]