改进的谐波小波包变换及其在弱故障特征提取中的应用

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振动与冲击 ›› 2013, Vol. 32 ›› Issue (17) : 29-34.

论文

改进的谐波小波包变换及其在弱故障特征提取中的应用

田福庆，罗荣

作者信息 +

The Improved Harmonic Wavelet Packet Transform and its Application in Weak Fault Feature Extraction

Tian Fu-qing, Luo Rong

Author information +

文章历史 +

摘要

通过引入频谱幅值修正系数改进了通常的谐波小波包变换。改进的谐波小波包变换使得信号分解前后各子带的频谱幅值保持不变，能精确提取相应子带故障调制信号的强度与频率，为机械故障诊断带来了方便。仿真实验和轴承故障诊断实例不仅表明谐波小波包具有一般正交小波包无法比拟的完美的带通滤波性能和极强的微弱特征信号提取能力，而且还表明改进的谐波小波包变换确实使得信号分解前后各子带的频谱幅值保持不变，能精确提取相应子带故障调制信号的强度与频率，有一定的工程应用价值。

Abstract

By introducing the modified coefficient of spectral magnitude, the improved harmonic wavelet packet transform is proposed. The improved harmonic wavelet packet transform makes the subband of signal maintains the spectral magnitude after the decomposition. So, the improved harmonic wavelet packet transform can extract exactly the amplitude and frequency of fault modulation signal and conveniences the fault diagnosis of mechanism. The simulation and fault signal analysis of bearing not only show that harmonic wavelet packet possesses perfect band-pass filter characteristic and excellent ability to detect weak signal, but also show that the improved harmonic wavelet packet transform authentically makes the subband of signal maintains the spectral magnitude after the decomposition and has some application value in fault diagnosis.

导出引用

田福庆;罗荣. 改进的谐波小波包变换及其在弱故障特征提取中的应用[J]. 振动与冲击, 2013, 32(17): 29-34

Tian Fu-qing;Luo Rong. The Improved Harmonic Wavelet Packet Transform and its Application in Weak Fault Feature Extraction [J]. Journal of Vibration and Shock, 2013, 32(17): 29-34