关键词: 小波变换, BP网络, 模拟电路, 故障诊断

Abstract:

This paper presents a systematic fault diagnosis method for analogue circuits based on the combination of wavelet transform and modified BP neural network (BPNN).With the wavelet decomposition as a preprocessor,the feature information is extracted by wavelet de-noising and normalization and applied to the BPNN.The method reduces the number of inputs to the neural network and improves the convergence speed and the ability to detect faults.Simulation results show that the scheme locates faults exactly with improved network structure and fault diagnosis precision and speed.

Key words: wavelet transform;BP networks;analogue circuits;fault diagnosis