故障诊断中非线性耦合特征提取的研究

Nonlinear Coupling Signature Extracting in Fault Diagnosis

从高阶谱分析的角度，通过检测信号频率成分间的非线性耦合特征来对故障信号进行检测．分析了耦合产生的机理、模式，建立了非线性耦合模型，在此基础上，在高阶域进行非线性耦合特征描述。

Higher order spectra are used to analyze the nonlinear coupling phenomena in condition monitoring and fault diagnosis. Instead of detecting the signal frequency, bicoherence is used as a signature to detect the nonlinear coupling. It reveals that the fault can be detected and located in the low frequency range with low SNR (Signal Noise Ratio).