基于局域波法的非线性系统模态参数识别研究  

Study of modal parameter identification of nonlinear system based on local wave method

作　　者：王凤利[1] 赵德有[2] 

机构地区：[1]大连海事大学轮机工程学院,辽宁大连116026 [2]大连理工大学船舶工程学院,辽宁大连116024

出　　处：《大连理工大学学报》2011年第1期56-60,共5页Journal of Dalian University of Technology

基　　金：国家自然科学基金资助项目(50475155);中央高校基本科研业务费专项资金资助项目(2009JC14)

摘　　要：研究基于局域波分析的非线性系统模态参数识别方法.首先在非线性系统响应局域波分解的基础上得到了等效线性系统,然后通过Hilbert变换识别系统的瞬时固有频率和瞬时阻尼系数.针对非线性转子系统的模态参数测试识别问题,提出测取转子系统在降速过程非稳定运行工况下的振动响应,并应用提出的模态参数识别方法来识别转子系统的瞬时固有频率和瞬时阻尼系数.对立方刚度非线性系统的仿真分析和实测的非线性转子系统模态参数的辨识,验证了方法的有效性.A parameter identification method based on local wave analysis is proposed to identify nonlinear structures.Firstly,the equivalent linear system is obtained through the local wave decomposition on a response signal of a nonlinear system.Then,Hilbert transform is applied to modal response,and the instantaneous frequency and the instantaneous damping are identified.For the parameter identification of nonlinear rotor system,the instantaneous frequency and the instantaneous damping can be obtained by using the proposed method on the measuring vibration response in non-stationary running condition.The results of simulation and experiments for cubic stiffness nonlinear system show that the presented method has high precision of parameter identification.

关 键 词：局域波法 非线性系统 模态分析 转子系统 

分 类 号：TP306[自动化与计算机技术—计算机系统结构]