论文部分内容阅读
对利用斜探头激励和接收高阶纵向模态进行了实验研究。通过Snell定理和超声导波的相速度频散曲线选择斜探头的入射角和激励频率,可以激励所需的高阶纵向模态。但随着模态阶次和激励频率的增加,对单一模态的控制也变得更加困难。同时,实验分析了激励斜探头个数对模态选取的影响,说明通过增加斜探头的个数来抑制弯曲模态是十分必要的。
An experimental study on the excitation and reception of high-order longitudinal modes using oblique probe is carried out. The Snell’s theorem and the phase velocity dispersion curve of the ultrasonic guided wave are selected to select the angle of incidence and the excitation frequency of the oblique probe to excite the desired higher order longitudinal mode. But as the modal order and the excitation frequency increase, it becomes more difficult to control a single modality. At the same time, the influence of the number of excitation oblique probe on the modal selection is analyzed experimentally, which shows that it is necessary to restrain the bending modal by increasing the number of oblique probe.