计算机工程与应用Issue(14)：214-218,225,6.DOI:10.3778/j.issn.1002-8331.1311-0320
基于LMD的模态参数识别方法
Method of identifying analog parameters based on LMD
程军圣 1朱文峰 1李宝庆1
作者信息
- 1. 湖南大学 汽车车身先进制造国家重点实验室，长沙 410082
- 折叠
摘要
Abstract
This method, by adopting the LMD(Local Mean Decomposition), identifies the inherent frequency and damp-ing ratio of mechanical systems. The self-adapting Local Mean Composition(LMD)method can disintegrate a complex signal to several PF(Production Function)components. Using LMD method to decompose the acceleration response sig-nal of a mechanical system with pulsed excitation gets some PF components with physical significance. With each PF component corresponding to the signal’s vibration response of one mode, the method is able to distinguish the inherent frequency and damping ratio of the signal in the modes, by matching the curves of instaneous frequency and magnitude. In this thesis, it analyses the experimental data of the transient response of a girder by adopting the simulating signal (method), and by using LMD and EMD. The comparison of the results of the two methods shows that the LMD method is of more superiorities in analysing modes.关键词
局部均值分解(LMD)/瞬态响应/固有频率/阻尼比Key words
Local Mean Decomposition(LMD)/transient response/inherent frequency/damping ratio分类
信息技术与安全科学引用本文复制引用
程军圣,朱文峰,李宝庆..基于LMD的模态参数识别方法[J].计算机工程与应用,2015,(14):214-218,225,6.
