重庆大学学报2024，Vol.47Issue(6)：15-23,9.DOI:10.11835/j.issn.1000.582X.2024.06.002
基于向量残差SVD的混凝土超声测试温度效应研究
Research on temperature effect of concrete ultrasonic testing based on vector residual SVD
摘要
Abstract
In order to study the influence of temperature on the coda wave signal of concrete ultrasonic test,the normalized angle between signal vectors is used as the fluctuation index to reflect the signal change caused by temperature effect. The eigenvectors characterising the magnitude of the temperature effect are obtained by SVD of the vector residual matrix,and the mathematical relationship between the vector space mapping and the temperature difference is established. Verification of concrete beam code wave signals are collected in the laboratory. The results show that the waveform of the coda wave signal shifts backward with increasing temperature,and the proposed method can quantify the temperature effect piecewise and linearly. Based on the quantization results,the most sensitive temperature range of ultrasonic coda wave signal at room temperature is obtained. When the temperature span is 4.5 ℃,74％～90％ of the temperature effect can be removed.关键词
向量残差/SVD/温度效应/混凝土/超声波Key words
vector residual/SVD/temperature effect/concrete/ultrasonic分类
建筑与水利引用本文复制引用
郑罡,陈鹏,彭宇,于吉港,陈伟基..基于向量残差SVD的混凝土超声测试温度效应研究[J].重庆大学学报,2024,47(6):15-23,9.基金项目
国家自然科学基金资助项目(51478072,51978112).Supported by National Natural Science Foundation of China(51478072,51978112). （51478072,51978112）
