裂纹转子识别中Wigner-Ville分布与小波变换的比较  

COMPARISION WIGNER-VILLE DISTRIBUTION WITH WAVELET TRANSFORM IN IDENTIFICATION OF CRACKED ROTOR

作　　者：邹剑[1] 陈进[1] 董广明[1] 

机构地区：[1]上海交通大学振动,冲击,噪声国家重点实验室,上海200030

出　　处：《机械强度》2003年第6期591-595,共5页Journal of Mechanical Strength

基　　金：国家973重点基础研究规划项目(G1998020321);国家自然科学基金(10176014);振动;冲击;噪声国家重点实验室开放基金(VSN-2002-03)资助项目~~

摘　　要：建立基于简单铰链裂纹模型的裂纹转子瞬态响应的动力学模型 ,得到裂纹转子与无裂纹转子的数值仿真解 ,比较裂纹转子与无裂纹转子Wigner Ville分布和小波变换时频特性的不同。数值仿真进一步对比研究Wigner Ville分布和小波变换对刚度变化的敏感性 ,并讨论质量偏心和质量偏心角对Wigner Ville时频特性与小波时频特性的影响 ,为工程实际中裂纹转子的识别提供依据。Based on the simple hinge crack model, the dynamic equation of transient response in a cracked rotor is modelled. The numerical simulation solutions of the uncracked rotor and the cracked rotor are obtained from the model. Using Wigner-Ville distribution and Wavelet transform, the time-frequency features of the cracked rotor and the uncracked rotor are compared. By simulation research, the sensitivity of Wigner-Ville distribution and Wavelet transform to the stiffness variation is investigated; and the influence of the unbalance and the inhabiting angle on the time-frequency feature is discussed. The time-frequency feature can be used as the criterion for identification of cracked rotor in engineering practices.

关 键 词：裂纹 转子 时频特性 Wigner-Vine分布 小波变换 瞬态响应 刚度 敏感性 动力学 

分 类 号：TH113[机械工程—机械设计及理论] O346[理学—固体力学]