【作者】 陈希平； 毛海杰； 李炜；

【Author】 CHEN Xiping MAO Haijie LI Wei (College of Electrical and Information Engineering, LanZhou Univ. of Tech. Lanzhou 730050)

【机构】 兰州理工大学电气与信息工程学院；

【摘要】 本文介绍了小波变换及其用于信号奇异性检测的基本原理,重点研究了信号奇异性检测中小波基(又称母小波)及尺度的选择问题,提出了规则性系数相似法,即根据相似性,可以用平滑的小波,即规则性系数大的小波表示平滑的函数;用不平滑的小波,即规则性系数小的小波表示非平滑的函数。同时针对天然气管道泄漏检测这一具体的工程实例,采用该方法对管道发生微小泄漏时所产生的缓变信号进行了分析,仿真实验验证了该方法的有效性和适用性。更多还原

【Abstract】 The theory of wavelet analysis and its application on signal singularity detection were presented in this paper. How to choose the mother wavelet and its scale for detection of the singularity of signal was the emphasis. It’s based on the fact that the wavelet is similar with the signal to be analyzed in regularity. That’s mean we can use smooth wavelet to present smooth signal and singular one to present nonsmooth signal. And at the same time we applied this method to the leak detection of gas pipeline. The simulation is presented to illustrate the validity and feasibility of the method.更多还原