| 基于小波变换的撞击流压力波动信号分析 |
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| 引用本文： | 张建伟,焦丽.基于小波变换的撞击流压力波动信号分析[J].力学与实践,2006,28(2):33-36. |
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| 作者姓名： | 张建伟 焦丽 |
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| 作者单位： | 沈阳化工学院机械工程学院,沈阳,110142;沈阳化工学院机械工程学院,沈阳,110142 |
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| 摘 要： | 通过小波变换对信号进行多尺度细化分析,解决了傅里叶变换不能解决的许多问题．从分析噪声和信号本身奇异点的区别入手,利用小波在时频两域突出信号局部特征能力的重要性质,即噪声信号小波变换的极大值随尺度的加大而显著减少的特点,对撞击流反应器撞击区压力波动信号进行处理分析．分析结果表明:小波变换可以较好地去除信号中的噪声;通过消噪后信号的功率谱可知,撞击流压力波动信号具有自相似的分形特征,与前期的实验研究相吻合．
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| 关 键 词： | 小波变换 撞击流 压力波动 信号分析 |
| 收稿时间： | 2005-02-03 |
| 修稿时间： | 2005-10-10 |
ANALYSIS OF PRESSURE FLUCTUATION BASED ON WAVELET TRANSFORM |
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| ZHANG Jianwei,JIAO Li.ANALYSIS OF PRESSURE FLUCTUATION BASED ON WAVELET TRANSFORM[J].Mechanics and Engineering,2006,28(2):33-36. |
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| Authors: | ZHANG Jianwei JIAO Li |
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| Institution: | College of Mechanical Engineering, Shenyang Institute of Chemical Technology, Shenyang 110142, China |
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| Abstract: | By means of the fractionated multi resolution analysis of the signals with wavelet transform, many problems can be solved, which can not be solved by Fourier transform. From the differences between singular points of noise and signal, and the important features of wavelet transform in highlighting the local profiles of signals both in time-frequency domains, i.e., the fact that the maximum of the noise wavelet transform reduces dramatically with the increase of the scale, the pressure fluctuation is analyzed. The results show that the wavelet transform is a good way to eliminate noise; and by the power profiles of de-noised signals, the pressure fluctuation shows a fractal construction, as revealed in the previous study. |
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| Keywords: | wavelet transforms impinging stream pressure fluctuation signal analyzing |
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