机械振动信号分析中小波函数的选择

作者：迟 军1，单一峰2 日期：2007-08-31/span> 浏览：3876 查看PDF文档

                                              机械振动信号分析中小波函数的选择*
                                                             迟 军1，单一峰2
    （1.宁波工程学院 机械工程学院，浙江 宁波315000; 2.宁波大红鹰职业技术学院，浙江 宁波 315175）

摘 要：小波函数直接影响着小波分析的结果。通过对计算机小波分析离散算法的分析，研究了不同阶次的Daubechies函数对分析过程的影响，又以具体的例子展现了相应的分析结果曲线，从而提出了与传统观点不同的小波函数选择标准。该标准对于工程测试中微弱机械振动信号的提取和分析有实际指导意义，有助于减少因函数选择不当带来的误判和误差。
关键词：机械振动；小波分析；小波函数；Daubechies函数

                            Alternative of wavelet function in mechanical vibration analysis
                                                CHI Jun1, SHAN Yifeng2
(1.College of Mechanical Engineering, Ningbo University of Technology, Ningbo 315000, China;
2.Ningbo Dahongying Vocational Technical College, Ningbo 315175, China)

Abstract: A wavelet function affects the wavelet analysis directly. The research on the analysis with various degree functions was performed after the study on the wavelet analysis discrete algorithm in a computer. Moreover, a detailed example was proposed with the corresponding analytical curves, an alternative criterion different from the traditional one for wavelet function was put forward. It refers to the direction of extraction and analysis for weak mechanical vibration in engineering testing. The error or wrong judgment caused by the improper choice of functions can be avoided.
Key words: mechanical vibration; wavelet analysis; wavelet function; Daubechies function