小波分层阈值降噪法及其在发动机振动信号分析中的应用

臧玉萍; 张德江 王维正

振动与冲击 ›› 2009, Vol. 28 ›› Issue (8) : 57-60.

PDF(1693 KB)
PDF(1693 KB)
振动与冲击 ›› 2009, Vol. 28 ›› Issue (8) : 57-60.
论文

小波分层阈值降噪法及其在发动机振动信号分析中的应用

  • 臧玉萍1,2,3 张德江4 王维正3
作者信息 +

A Per-level Threshold De-nosing Method Using Wavelet and Its Application in Engine Vibration Analysis

  • ZANG Yuping1,2,3 ZHANG Dejiang4 WANG Weizheng3

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摘要

摘要:通过对小波消噪原理的分析及常用阈值规则的降噪性能对比,提出了基于小波细节系数自相关性分析的分层阈值降噪法,描述了根据有用信号最小频率成分确定最大分解层数的方法,给出了分层阈值降噪法的步骤,并对模拟的含噪振动信号进行了试验研究,结果表明,该方法具有较好的降噪效果,尤其适合于强噪声背景下弱信号的恢复,有利于较高频率有用信号的提取。最后,对小波分层阈值降噪法在发动机振动信号分析中的实际应用进行了研究,研究证明,该方法可以有效地抑制背景噪声,提取有用状态信息,为发动机振动信号预处理提供了一种切实可行的方法。

Abstract

Abstract:The de-nosing principle using wavelet was discussed and the de-nosing property was compared using general threshold strategy. Following them a per-level de-nosing method based on the analysis to the autocorrelation of the wavelet detailed coefficients is proposed. The maximum wavelet decomposing level is determined according to the minimum interest frequency. The step of the per-level de-nosing method is then given and its experiment research to vibration model is processed. The results proved that the method is better for de-nosing, which is more suitable to recover the interest weak signal from intense background noise. Last, its application in the engine vibration is processed and the results proved that it can inhibit the background noise effectively and recover the interest information. It provides a practical strategy for engine vibration pre-processing.

关键词

小波 降噪 阈值 自相关序列

Key words

Wavelet De-nosing Threshold Autocorrelation sequence

引用本文

导出引用
臧玉萍; 张德江 王维正. 小波分层阈值降噪法及其在发动机振动信号分析中的应用 [J]. 振动与冲击, 2009, 28(8): 57-60
ZANG Yuping; ZHANG Dejiang WANG Weizheng. A Per-level Threshold De-nosing Method Using Wavelet and Its Application in Engine Vibration Analysis [J]. Journal of Vibration and Shock, 2009, 28(8): 57-60

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