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基于小波分析的柴油机振动信号降噪处理
引用本文:张亮,杜海平,史习智.基于小波分析的柴油机振动信号降噪处理[J].数据采集与处理,2000,15(4):524-527.
作者姓名:张亮  杜海平  史习智
作者单位:上海交通大学振动、冲击、噪声国家重点实验室上海,200030
摘    要:针对柴油发动机缸盖振动信号信噪比低且呈非平衡特性,对柴油机在工作过程中的缸盖振动信号进行小波噪处理,突出了缸盖在不同时刻受到的激振,为柴油机在线控制和故障诊断提供了进一步的处理和识别的依据。本文对消除柴油机振动信号的随机成分,提高信噪比提出了一种新的方法-小波变换方法。分析中利用3次B样条小波对2135G柴油机的缸盖振动信号按Mallat算法进行分解,运用小波的滤波性能去除随机干扰,对振动信号进行了重构,获得了预计良好的分析结果,显示了小波技术在柴油机信号处理-控制领域的广阔应用前景。

关 键 词:柴油机  振动信号  降噪处理  小波分析
修稿时间:2000年1月4日

Noise Reduction of Cylinder Vibration Based on Wavelet Series
Zhang Liang,Du Haiping,Shi Xizhi.Noise Reduction of Cylinder Vibration Based on Wavelet Series[J].Journal of Data Acquisition & Processing,2000,15(4):524-527.
Authors:Zhang Liang  Du Haiping  Shi Xizhi
Abstract:In facing to the problem of low signal/noise ratio and nonstationary cylinder head vibration signal of diesel engine, the shock exeitation of the cylinder cover is well reflected by using good properties of the multi-resolution analysis of the wavelet function .It provides the basis of processing and idemifying for controlling on-line and fault diagnosis. In order to remove stochastic signal of cylinder vibration and increase signal/noise ratio, a new method -- wavelet transform is proposed in this paper. B-quadratic spline wavelet with compact support and Mallat algorithm is selected in the analysis of cylinder vibration signals of 2135G. By using wavelet filters, reconstruction of vibration signals without noise is obtained. Analyzed results, which are difficult to be obtained from the traditional signal processing technique, show the promising future of this method in diesel.
Keywords:diesel  vibration signal  wavelet transform  surface vibration
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