• CN:11-2187/TH
  • ISSN:0577-6686

›› 2008, Vol. 44 ›› Issue (5): 191-195.

• 论文 • 上一篇    下一篇

非平稳信号瞬时特征提取的谐波小波方法

朱洪俊   

  1. 西南科技大学制造科学与工程学院
  • 发布日期:2008-05-15

Extraction of Instantaneous Characteristics of Nonstationary Signal Using Harmonic Wavelet Transforms

ZHU Hongjun   

  1. College of Manufacturing Science and Engineering, Southwest University of Science and Technology
  • Published:2008-05-15

摘要: 分析了非平稳信号的瞬时特征(瞬时频率和瞬时相位),对非平稳信号进行谐波小波变换,建立非平稳信号的谐波小波系数与该信号的瞬时特征之间的关系,提出非平稳信号瞬时特征提取的谐波小波模型和提取方法。通过算例中的线性调频信号和应用实例中的轴承座振动信号的验证表明,该模型与方法具有较好的抗噪能力,对非平稳信号的瞬时特征具有更高的分析精度,能实现非平稳信号中特殊成分的瞬时特征提取。该方法能通过傅里叶变换实现其快速算法,具有算法简单、快速的特点,实现非平稳信号瞬时特征的实时分析。

关键词: 非平稳信号, 瞬时特征, 特征提取, 谐波小波变换

Abstract: The instantaneous characteristics of non-stationary signal are analyzed. Then non-stationary signal are transformed by using harmonic wavelet, and the relation between the wavelet coefficient and the instantaneous characteristics of non-stationary signal are introduced. The principle and method of the accurate extraction for the instantaneous characteristics of non-stationary signal by using harmonic wavelet transforms are presented. Examples of application demonstrate that this method presented can effectively extract the instantaneous characteristics of special components in the non-stationary signal and has high precision and good noise resisting ability. This method can realize simple and quick algorithm through Fourier transform, and real-time analysis of instant taneous characteristics of non-stationary signal.

Key words: Characteristic extraction, Harmonic wavelet transforms, Instantaneous characteristic, Non-stationary signal

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