混合(物理)
声学
振幅
超声波传感器
非线性系统
基频
谐波
非线性声学
横截面
光学
航程(航空)
混频
机械
交叉极化波的产生
纵波
物理
材料科学
表面波
波传播
结构工程
工程类
激光器
量子力学
复合材料
作者
Jianfeng Liu,Kui Wang,Mingjie Zhao,Zhichao Nie
标识
DOI:10.1080/10589759.2021.1943386
摘要
Considering that the nonlinear ultrasonic mixing method is seldom used in concrete detection, for the feasibility of the non-collinear mixing method detecting concrete, this study conducts ultrasonic nonlinear research on sum frequency longitudinal wave scattered by two intersecting ultrasonic transverse waves. Based on non-collinear mixing theory, the paper analyses the angle between two incident fundamental frequency waves and the relationship between incident angle and frequency ratio to form non-collinear mixing testing system. Testing on concrete beams, the relationship between the nonlinear coefficient and the respective frequency and amplitude of the incident fundamental waves have been explored. The results show that mixing wave appeared only when the frequency ratio of two fundamental waves was in the range of 0.54–1.87. The nonlinear coefficient gradually decreases with the increase of frequency and amplitude of the fundamental waves. The amplitudes of the fundamental and the mixing wave increase with the rising of the frequency of the fundamental wave. Compared with the test results of the higher harmonic ratios method, the nonlinear coefficient of non-collinear mixing method is more sensitive to the change of fundamental frequency and amplitude, which verified the feasibility of non-collinear mixing method in detecting concrete damage.
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