文章摘要
张小琼,林维正.小波包分析在混凝土检测中的应用[J].声学技术,2002,(3):134~136
小波包分析在混凝土检测中的应用
Wavelet packets analysis in the application of concrete detecting
投稿时间:2001-07-19  修订日期:2001-11-16
DOI:
中文关键词: 超声波  小波包  向量
英文关键词: ultrasonic waves  wavelet packets  vector quantities
基金项目:
作者单位
张小琼 同济大学声学研究所, 上海, 200092 
林维正 同济大学声学研究所, 上海, 200092 
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中文摘要:
      当前,对混凝土质量判断主要依赖于对接收信号的处理。和小波分析相比,小波包分析的优势在于其不仅对低频部分进行分解,对高频部分也进行分解,并能根据被分析信号的特征,自适应地选择相应频带,使之与信号频谱相匹配,从而提高时频分辨率。本文利用小波分析方法,对超声接收信号进行小波包分解,分别提取各个频率成分的信号特征,并对小波包分解系数重构,求出各频带信号的总能量。通过构造特征向量,进行归一化处理,用实验统计方法确定特征值和容差范围,通过对不同混凝土试块中传播的超声波进行分析,判断出混凝土的内部质量。
英文摘要:
      The quality estimation of concrete generally depends on the analysis of received waves.The advantage of wavelet packets analysis lies in analyzing the high-frequency part of received waves,as well as the low-frequency part.And according to the character of signal,it can choose the corresponding frequency to improve the resolving power in time domain.The paper gives description of wavelet packets analysis of received waves,by finding the character of different frequency part and reconstructing the decomposing coefficient to get the overall energy of signal.With the statistical methods,the thesis finds out the characteristic value and tolerance range by constructing the characteristic vector.According to the analysis of received ultrasonic waves from different concrete mass,the interior quality of concrete can be judged.
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