摘要
介绍Gabor小波时频分析的基本理论,用数值仿真举例验证Gabor小波时频分析可同时在时域和频域上来表征信号分布的特点。利用该方法可得到声发射源定位中传感器接收到的声发射信号在时域和频域上的分布,并用于区分声发射信号的传播模式和不同的信号组成,得到声发射波群的准确到达时间,从而提高时差定位的精度。
This paper introduced the theory of Gabor wavelet time-frequency analysis and characteristics of expressing the signal of acoustic emission in time and frequency domain. An example of numerical simulation was given to demonstrate the characteristics of Gabor wavelet.The time-frequency distribution of acoustic emission signal received by a sensor can be got by this method.So different modes or different components of acoustic emission signal can be distinguished and accurate arrival time of wave group decided by the peak of Gabor wavelet transform can enhance the accuracy of acoustic emission source localization.
出处
《中国测试技术》
2006年第1期76-79,共4页
CHINA MEASUREMENT & TESTING TECHNOLOGY
基金
国家自然科学基金项目资助(50375069)
江苏省教育厅"青蓝工程"
关键词
GABOR小波
时频分析
声发射
信号处理
Gabor wavelet
Time-frequency analysis
Acoustic emission
Signal processing
