Computer Simulation for Air-coupled Ultrasonic Testing

3rd International Symposium on Laser Ultrasonics and Advanced Sensing

Yamawaki, H.^1

National Institute for Materials Science, 1-2-1 Sengen, Ibaraki 305-0047 Tsukuba, Japan^1

关键词: Air coupled ultrasonic techniques;    Air-coupled ultrasonic;    Air-coupled ultrasounds;    Independent variables;    Non-contact;    Particle velocities;    Ultrasonic testing method;    Wave forms;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/520/1/012019/pdf
DOI  :  10.1088/1742-6596/520/1/012019

来源: IOP

【 摘 要 】

Air-coupled ultrasound is used as non-contact ultrasonic testing method. For wider application of air-coupled ultrasonic technique, it is required to know situation of ultrasonic propagation between air and solid. Transmittance of the ultrasonic waves from air to solids is extremely small with 10-5however it was revealed that, by using computer simulation methods based on the two-stage elastic wave equation in which two independent variables of stress and particle velocity are used, visualization calculation of ultrasonic propagation between air and solid was possible. In this report, the calculation of air-coupled ultrasound using the new Improved-FDM for computer simulation of ultrasonic propagation in solids is shown. Waveforms obtained by 1-dimensional calculation are discussed for principle and performance of the calculation. Visualization of ultrasonic incidence to cylindrical steel pipe is demonstrated as an example to show availability for ultrasonic testing.