混凝土梁尾波信号环境噪声对照补偿法  

Comparative compensation method for environmental noise of concrete beam coda wave

作　　者：郑罡[1,2] 薛文琪 宋林正 张智宇 ZHENG Gang;XUE Wenqi;SONG Linzheng;ZHANG Zhiyu(School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China;State Key Laboratory of Mountain Bridge and Tunnel Engineering(Chongqing Jiaotong University),Chongqing 400074,China)

机构地区：[1]重庆交通大学土木工程学院,重庆400074 [2]山区桥梁及隧道工程国家重点实验室(重庆交通大学),重庆400074

出　　处：《中国科技论文》2024年第9期1011-1017,共7页China Sciencepaper

基　　金：国家自然科学基金资助项目(51978112);重庆交通大学研究生科研创新项目(2023S0024)。

摘　　要：为推进超声尾波技术在混凝土结构检测中的应用,研究了环境干扰引起的混凝土梁超声尾波信号特征噪声并提出噪声补偿方法。开展了自然环境下的混凝土梁超声试验,提出平移缩放旋转多特征算法,将尾波信号的波速、频率、幅值特征以时间平移、时轴缩放、向量旋转3种参数形式进行分析。通过两试件超声对照试验,对尾波环境噪声进行补偿,并与尾波干涉法信号降噪结果进行对比,验证本文方法的有效性。结果表明:温度是尾波环境噪声的主要来源,湿度为次要来源;本文方法对尾波信号的降噪效果可达到91%以上,显著优于尾波干涉法;通过对照试件特征参数的噪声补偿可达到90%水平。研究结果可为提高尾波信号稳定性提供研究方法与试验基础。In order to promote the application of ultrasonic coda wave technology in the detection of concrete structures,the feature noise of ultrasonic coda wave of concrete beam caused by environmental interference was studied and the noise compensation method was proposed in this paper.The ultrasonic test of concrete beam in natural environment was carried out,and the multi-feature algo⁃rithm for the translation stretching rotation was proposed.The velocity,frequency and amplitude features of the coda wave were ana⁃lyzed in terms of time translation,time stretching and vector rotation.Through the ultrasonic contrast test of two samples,the coda wave environmental noise was compensated,and the noise reduction result of the coda wave interferometry signal was compared to verify the effectiveness of this method.The results show that temperature is the main source of coda wave environmental noise,while humidity is the secondary one.The noise reduction effect of this method on coda wave can reach more than 91%,which is sig⁃nificantly better than that of coda wave interferometry.By comparing the feature parameters of the specimen,the noise compensa⁃tion level can reach 90%.The findings of this paper provides research methods and experimental basis for improving the stability of coda wave.

关 键 词：混凝土 超声尾波 环境影响 信号处理 

分 类 号：TU375.1[建筑科学—结构工程]