基于Volterra频域核辨识的非线性模拟电路故障诊断

基于Volterra级数时域频域混合模型,提出了辨识非线性模拟电路频域核的故障诊断方法.利用混合模型辨识算法和范德蒙特法估计各种故障状态下电路响应的前3阶频域核,提取故障特征并与相应的故障模式一起构成特征样本集,借助于支持向量机多分类器进行分类识别,实现非线性模拟电路的故障诊断.阐述了诊断原理及诊断步骤,并给出了诊断实例.仿真结果表明,该方法的故障识别率较高,便于计算机计算.

Fault diagnosis of nonlinear analog circuits based on Volterra frequency domain kernel identification

Based on Volterra time/frequency domain algorithm,a method of fault diagnosis is presented,which can identify frenquency kernel of nonlinear analog circuit.The forward three order Volterra kernels in frequency domain can be obtained by using the identifying algorithm and Vandermonde method under faulty models.Circuits fault features are extracted,which are combined with faulty modes and regarded as faulty characteristic samples.The support vector machine multi-classifier is trained by faulty characteristic ...