双谱分析及其在机械诊断中的应用

提出基于双谱分析的机械故障诊断方法。分析双谱的性质和物理意义 ,探讨双谱抑制噪声和提取故障信息的能力。利用双谱分析 2种典型的机械故障 ,结果显示 ,双谱分析与传统的基于 FFT的频谱分析方法相比 ,能更加有效地提取故障征兆。

Bispectral Analysis and Its Application in Machinery Diagnosis

A method based on bispectral analysis is introduced for machinery fault diagnosis. A brief review of bispectrum is presented, while most emphasis is placed on the ability of bispectrum to suppress noise and extract diagnostic information from fault signals. Furthermore, by use of the algorithm of bispectrum, two kind of typical mechanical faults are analyzed. Results show that bispectral analysis is a more efficient method in machinery diagnosis compared with FFT-based spectral analysis.