基于分数阶Wigner分布的机械故障诊断方法研究

Fault Diagnosis of Machinery Based on Fractional-Order Wigner Distribution

为采用分数阶Wigner分布的机械故障诊断新方法,讨论了分数阶Wigner分布中最优分数阶的选择。仿真研究表明,分数阶Wigner分布优于传统的Wigner分布,分数阶Wigner分布能有效地抑制交叉项干扰。将提出的方法应用到轴承故障诊断中,实验结果验证了提出的方法的有效性。

The definition and algorithm of fractional-order Wigner distribution is introduced. A new machinery fault diagnosis method based on the fractional-order Wigner distribution is proposed. The choice of the optimal fractional order is discussed. The simulation result shows that the fractional-order Wigner distribution is superior to the traditional Wigner distribution, and can effectively suppress the interference from the intersect terms in the Wigner distribution. Finally, the proposed method is successfu-lly applied to the fault diagnosis of bearings. Experimental result also verifies the validity of the proposed method.