基于 LabVIEW 的木材声发射信号采集与小波析取

摘要

为了获取木材声发射信号波形，采用 NI 高速数据采集设备构建了一种多通道声发射信号采集系统，同时基于 LabVIEW 软件设计了相应的信号小波析取与处理平台，实现多通道声发射信号采集、分离、波形析取及频谱分析等基本功能。最后通过木材试件声发射试验验证了该系统的效用，并且通过对3种不同信号析取方法的比较，进一步验证小波分析的优势。作为一种通用的木材声发射信号采集与处理平台，该系统为木材声发射信号研究提供了必要的基础保障。%In order to obtain wood acoustic emission signal waveform, A multi channel acoustic emission signal acquisition system was constructed based on NI high-speed data acquisition equipment. At the same time, a signal wavelet extraction and processing platform based on LabVIEW software was designed, which can be used to collect, separate, extract the acoustic emission signal, spectral analysis and other basic functions. Finally, the wood specimen acoustic emission tests were carried out to verify the effectiveness of the system. And through the comparisons among three different signal extract ways, the advantages of wavelet analysis method was verified. As a universal platform for wood acoustic emission signal acquisition and processing, this system provides the necessary foundation for the processing of wood acoustic emission signal.