Department of Mechanical and Electrical Engineering, Massey University, Auckland, New Zealand.
Ultrasonics. 2022 Feb;119:106583. doi: 10.1016/j.ultras.2021.106583. Epub 2021 Oct 5.
Research related to acoustic/ultrasonic guided wave testing in wood is still at an early stage. This paper describes the first study to perform ultrasonic guided wave measurements in a wooden rod using arrays of shear transducers. Enhancement of either longitudinal L(0,1) or torsional T(0,1) wave modes and suppression of other modes was able to be achieved using these arrays. At low frequencies, it was found that the L(0,1) wave mode had a similar speed to that obtained using the traditional resonance and time of flight methods. The torsional T(0,1) wave mode has not been used before for non-destructive testing of wood. Since it is non-dispersive, it would appear to be suitable for wood property estimation and structural health monitoring of wooden structures. These results indicate that ultrasonic guided wave testing techniques have strong potential to be used to provide improved measurement of wood properties and structural health monitoring of wooden structures.
在木材的声学/超声导波检测方面的研究仍处于早期阶段。本文描述了首次使用剪切传感器阵列在木杆中进行超声导波测量的研究。这些阵列能够增强纵向 L(0,1)或扭转 T(0,1)波模式，并抑制其他模式。在低频下，发现 L(0,1)波模式的速度与传统的共振和飞行时间方法获得的速度相似。扭转 T(0,1)波模式以前从未用于木材的无损检测。由于它是非色散的，因此它似乎适合于木材性质估计和木质结构的结构健康监测。这些结果表明，超声导波检测技术具有很大的潜力，可以用于提供改进的木材性质测量和木质结构的结构健康监测。
