振动诊断的理论基础

本文是“整机振动规范及信号分析技术研究”、“发动机台架振动监视预研”两个课题的总结。本文着重分析振动诊断的理论基础,从理论上总结研究中的经验。

THEORETICAL BASIS OF VIBRATION DIAGNOSIS

Three vibration diagnosis methods are discussed, which are normal spectrum analysis method, modal parameter recognition method and time series analysis method. It is demonstrated that the modal parameter recognition method is far from a practical one due to its threoretical shortcomings. The time series analysis method is promising to diagnose the machine defaults while ased as a tool to recognize the "input form filter". Therefore, this method is comparable with the maximum entropy spectrum analysis but performed in the time domain. A perfect diagnosis software should contain both the normal spectrum and time series analysis methods.