Wigner分布的改进及其在非平稳振动分析及诊断中的应用

Some Modifieations on the Wigner Distribution and Applications in the Nonstationary Vibration's Analysis and Diagnosis

Wigner分布是近年来应用于非平稳信号处理的新方法，但沿用的基于Classen定义的方法存在着频率混叠等缺陷和不足，本文通过对Wigner分布的物理意义及主要性质的讨论，推导并验证了Wigner分布的两种改进形式—基于Peyrin定义的的PWVD和移动AR－PWVD．在柴油机振动分析及诊断的应用中证明了以上方法的工程实用性和有效性．

The wigner-Ville Distribution(WVD) is a new processing methods for nonstationary Signals developed recently.But its often-used Classen's defination have some disadvantages such as the frequency aliasing etc., With the brief discussion about the WVD's physical implications and properties,two medifications about the WVD-PWVD based on the Peyrin's definition and the moving AR-PWVD are deduced and verified by analytic and experimental research,in this paper, Actural effectiveness for engineering applications are proved by the application on the diesel engines time-varying vibration's analysis and diagnosis.