基于MATLAB编程的木质复合材料缺陷信号小波分析

WAVELET ANALYSIS ON DEFECT SIGNALS OF WOOD COMPOSITE MATERIALS BASED ON MATLAB PROGRAMMING

介绍了小波理论的发展、小波变换处理信号的基本原理。结合MATLAB的小波工具箱、信号处理工具箱编写程序,在MATLAB环境中实现信号的小波与小波包分析,同时输出信号特征参数和相关的分析图形。利用该程序对木质复合材料缺陷信号进行分析处理,通过提取信号的特征值能量率实现木质复合材料左端、中部和右端缺陷定位无损检测。

The development of wavelet theory and the rationale of signal processing by wavelet transform were introduced. Wavelet toolbox and signal processing toolbox of MATLAB were employed for programming, and signals analysing by wavelet and wavelet packet was imple- mented in environment of MATLAB, and the character parameters of the signal and correlative analysis graph were output simultaneously. Then, defect signal analysis and processing for wood composite materials was carried out by using this program and the nondestructive testing for defects location on left, middle and right of wood composite materials was done through extracting energy rate of signalg feature value.