基于线调频小波变换能量谱的电机故障信号处理
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摘要
提出了一种基于高斯线调频小波变换诊断电机故障的新方法。线调频小波变换是信号的时间-频率-尺度变换, 具有比小波变换及其它时频分析更强的非平稳信号分析功能。利用高斯线调频小波变换作电机故障信号的能量谱估计,可提取电机故障信号的频率成份。试验结果表明,这种方法比Fourier变换和小波变换频率分布的能量更集中。
In this paper, a new method of diagnosing electric machine fault, which based on gauss chirplet transforms, is presented. Chirplet transforms (CTs) are variation of the time, the frequency, and the scale of the signal. CTs have more effective than wavelet transforms in time-frequency analyzing of non-stable signals. Energy spectrums of electric machine fault signal can be gauged by using Gauss CTs, so the frequencies of the signal can be extracted. Experiment results show this method is more concentrated in energy than fourier transform and wavelet transform.
In this paper, a new method of diagnosing electric machine fault, which based on gauss chirplet transforms, is presented. Chirplet transforms (CTs) are variation of the time, the frequency, and the scale of the signal. CTs have more effective than wavelet transforms in time-frequency analyzing of non-stable signals. Energy spectrums of electric machine fault signal can be gauged by using Gauss CTs, so the frequencies of the signal can be extracted. Experiment results show this method is more concentrated in energy than fourier transform and wavelet transform.
引文
[1] Charles K. An Introduction to Wavelets [M]. Academic Press, Inc. 1992.
[2] Mann S, Haykin S. Chirplets and Wavelets: Novel Time-frequency Methods [J]. Electronics Letters, 1992(28): 114-116.
[3] Mann S, Haykin S. The Chirplet Transform: Physical Con Siderations[J], Signal Processing, 1995, 43(11):2 745-2 761．
[4] 任震,胡国胜,黄雯莹,等．基于线调频小波变换的电机故障 信号消噪方法[J]．电工技术学报,2002,17(3):59-52,11．
[5] 胡国胜,任震,黄雯莹,等．三角样条调频小波变换的电机 轻微故障定位[J]．电网技术,2002,27(3):28-31．
[6] 刘希强,周蕙兰,曹文海,等．高斯线调频小波变换及其在地 震震相识别中的应用[J]．地震学报,2002,24(6):607-616．
[7] 张贤达,保铮．非平稳信号分析与处理[M]．北京:国防工 业出版社,1999．
[8] 胡国胜,陈一天,任震．Fourier变换和小波变换一般形 式——线调频小波变换和多普勒小波变换[J]．计算机工程与 应用,2002,38(5):46-48．
[2] Mann S, Haykin S. Chirplets and Wavelets: Novel Time-frequency Methods [J]. Electronics Letters, 1992(28): 114-116.
[3] Mann S, Haykin S. The Chirplet Transform: Physical Con Siderations[J], Signal Processing, 1995, 43(11):2 745-2 761．
[4] 任震,胡国胜,黄雯莹,等．基于线调频小波变换的电机故障 信号消噪方法[J]．电工技术学报,2002,17(3):59-52,11．
[5] 胡国胜,任震,黄雯莹,等．三角样条调频小波变换的电机 轻微故障定位[J]．电网技术,2002,27(3):28-31．
[6] 刘希强,周蕙兰,曹文海,等．高斯线调频小波变换及其在地 震震相识别中的应用[J]．地震学报,2002,24(6):607-616．
[7] 张贤达,保铮．非平稳信号分析与处理[M]．北京:国防工 业出版社,1999．
[8] 胡国胜,陈一天,任震．Fourier变换和小波变换一般形 式——线调频小波变换和多普勒小波变换[J]．计算机工程与 应用,2002,38(5):46-48．
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