基于双树复小波包的发动机振动信号特征提取研究

吴定海;张培林;任国全;傅建平;韩兰懿

振动与冲击 ›› 2010, Vol. 29 ›› Issue (4) : 160-163,.

PDF(1876 KB)
PDF(1876 KB)
振动与冲击 ›› 2010, Vol. 29 ›› Issue (4) : 160-163,.
论文

基于双树复小波包的发动机振动信号特征提取研究

  • 吴定海;张培林;任国全;傅建平;韩兰懿
作者信息 +

Study on Feature Extraction of Engine Vibration Signal Based on Dual Tree Wavelet Package Transform

  • Wu Dinghai; Zhang Peilin; Ren Guoquan; Fu Jianping; Han Lanyi
Author information +
文章历史 +

摘要




针对柴油机缸盖振动信号的特征提取问题,提出了一种基于双树复小波包变换和自适应块阈值降噪的标准化相对能量提取方法,双树复小波包利用并行双树实小波变换分解系数达到信息互补,从而获得近似平移不变性和减少了信息的丢失。自适应分块阈值能够随所分析的信号自适应估计最优阈值,达到更好的降噪效果,同时引入消除频率混叠的算法,抑制了双树复小波包分解过程中虚假频率的产生。仿真信号和试验分析该方法能够更有效地消除噪声影响,所提取的相对能量特征具有更好的可区分度。




Abstract

Aimed to extract the relative energy of engine cylinder head vibration signals, a new method based on dual tree wavelet package transform and adaptive SURE block threshold de-noising was proposed. The DT-CWPT make sure that the coefficients decomposed by tree a and tree b can be complementary information at each scales, so the DT-CWPT can achieve approximate shift invariance and decrease the information missing. The adaptive block threshold de-noising method gains the best threshold and the optimal neighborhood effect length for signal de-noising and can obtain higher signal-to-noise. Also causes of frequency aliasing and frequency bands derangement were discussed and Fourier transform method was applied to suppress the false frequency in dual tree wavelet package transform. The simulated signal and measured signal test results show that the proposed method has a good de-nosing performance and more effective in fault feature extraction.

关键词

双树复小波包 / 特征提取 / 降噪 / 振动信号 / 故障诊断

Key words

dual tree wavelet package transform / feature extraction / de-noising / vibration signal / fault diagnosis

引用本文

导出引用
吴定海;张培林;任国全;傅建平;韩兰懿. 基于双树复小波包的发动机振动信号特征提取研究[J]. 振动与冲击, 2010, 29(4): 160-163,
Wu Dinghai;Zhang Peilin;Ren Guoquan;Fu Jianping;Han Lanyi. Study on Feature Extraction of Engine Vibration Signal Based on Dual Tree Wavelet Package Transform [J]. Journal of Vibration and Shock, 2010, 29(4): 160-163,

PDF(1876 KB)

Accesses

Citation

Detail

段落导航
相关文章

/