| 基于小波变换的内燃机瞬时转速信号的分析 |
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| 引用本文： | 潘金凤,张卫宁,徐龙玺,袁华.基于小波变换的内燃机瞬时转速信号的分析[J].山东大学学报(工学版),2004,34(6):47-50. |
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| 作者姓名： | 潘金凤 张卫宁 徐龙玺 袁华 |
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| 作者单位： | 1. 山东大学,信息科学与工程学院,山东,济南,250100
2. 济南大学,信息工程学院,山东,济南,250022 |
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| 摘 要： | 使用非线性离散序列的小波变换 (DTWT)对同时存在高频噪声和高斯白噪声的内燃机瞬时转速信号进行去噪 .通过对此信号进行频谱分布的分析 ,用Donoho的阈值去噪法去除高斯白噪声之后 ,根据小波变换的多分辨率思想 ,提出了仅使用小波变换的尺度系数进行小波反变换来去除高频噪声 ,然后运用小波反变换来恢复内燃机瞬时转速信号的方法 .实验结果表明 ,此方法能够较精确的去除噪声 ,恢复内燃机瞬时转速信号 .
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| 关 键 词： | 瞬时转速 小波变换 去噪 频谱 |
| 文章编号： | 1672-3961(2004)06-0047-04 |
| 修稿时间： | 2004年5月19日 |
Analysis on the transient speed signal of internal combustion engine based on wavelet transform |
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| PAN Jin-feng ,ZHANG Wei-ning ,XU Long-xi ,Yuan hua.Analysis on the transient speed signal of internal combustion engine based on wavelet transform[J].Journal of Shandong University of Technology,2004,34(6):47-50. |
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| Authors: | PAN Jin-feng ZHANG Wei-ning XU Long-xi Yuan hua |
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| Affiliation: | PAN Jin-feng 1,ZHANG Wei-ning 1,XU Long-xi 2,Yuan hua 1 |
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| Abstract: | The method of nonlinear DTWT is used to do denoising for the transient speed signals of internal combustion engine in which high frequency noises and Gaussian white noises exist simultaneously. Donoho's soft thresholding method is used to denoise the Gaussian whiue noises by analyzing the spectrum distribution of transient speed signal. A new method using only wavelet transform scale coefficients to reduce high frequency noises based on the wavelet transform's multi-resolution analysis theory is proposed. Experimental results show that the method can reduce the noises effectively and restore the transient speed signals of internal combustion engine. |
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| Keywords: | transient speed wavelet transform denoise spectrum |
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