摘要
小波变换具有在时域和频域内的局部化特性,对于弱信号的检测非常方便,易于从高信噪比的信号中去除噪声,在故障诊断领域中的信号去噪应用非常广泛.首先介绍了小波变换的基本原理,建立了晶闸管三相桥式全控整流电路的MATLAB仿真模型,并对故障仿真中的含噪信号进行了小波变换去噪,较好地从噪声中分离出了电压故障曲线.
It is pointed out that wavelet transform（WT） has powerful ability for weak signal detection and denoising with high SNR which helps itself to be used for fault diagnosis widely.The paper reviews the basic principle of wavelet transform. In the end, the model of three - phase bridge all - wave controllable rectifying circuit of thyristor is built and wavelet transform is used for different fault signal detection which has white - noise and harnonic current. The results show that it is very effective in fault diagnaosis.
出处
《兰州工业高等专科学校学报》
2006年第1期13-16,共4页
Journal of Lanzhou Higher Polytechnical College
关键词
小波变换
晶闸管
桥式整流
故障诊断
wavelet transform
thyristor
bridge rectifying circuit
fault diagnosis
