Case study of guided wave propagation in a one-side water-immersed steel plate

Case Studies in Nondestructive Testing and Evaluation Pub Date : 2015-04-01 DOI:10.1016/j.csndt.2014.11.001

Lingyu Yu, Zhenhua Tian

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引用次数: 29

Abstract

This paper presents a case study of guided waves in a steel plate with one side immersed in water. A hybrid sensing system that uses PZT as the guided wave actuator and a scanning laser vibrometer as the guided wave receiver is employed to acquire the time–space wavefield data. By using the two dimensional Fourier transform, the time–space wavefield is transformed into the frequency–wavenumber domain where the wave modes and the guided wave dispersion can be determined. The study confirms the existence of quasi-Scholte wave in the one-sidedly water-immersed plate in addition to fundamental guided waves. The results also show the quasi-Scholte wave can be directly generated and measured in the immersed plate at low frequencies using the present sensing system. Through pitch–catch sensing tests, the influence of water on guided wave propagation in the one-side water-immersed plate is investigated. It is seen that the water level affects the wave propagation time linearly and can be potentially used for estimation of water level in a container.

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单面水浸钢板中导波传播的实例研究

本文以一面浸入水中的钢板为例，研究了导波在钢板中的作用。采用压电陶瓷作导波作动器，扫描激光测振仪作导波接收器的混合传感系统来获取时空波场数据。利用二维傅里叶变换，将时空波场转换为频率波数域，在频波数域中可以确定波模和导波色散。研究证实了在单面水沉板中除了基导波外还存在准scholte波。实验结果还表明，利用该传感系统可以在低频率下直接在沉板中产生和测量准scholte波。通过节距感应试验，研究了水对导波在单面水浸板中传播的影响。可见，水位对波的传播时间有线性影响，可用于容器内水位的估计。

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Case Studies in Nondestructive Testing and Evaluation

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