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Open AccessArticle

Modeling Flaw Pulse-Echo Signals in Cylindrical Components Using an Ultrasonic Line-Focused Transducer with Consideration of Wave Mode Conversion

1
School of Traffic and Transportation Engineering, Central South University, Changsha 410075, China
2
China Rolling Stock Corporation Qingdao Sifang Co., Ltd., Qingdao 266111, China
3
Key Laboratory of Traffic Safety on Track, Ministry of Education, Changsha 410075, China
*
Author to whom correspondence should be addressed.
Sensors 2019, 19(12), 2744; https://doi.org/10.3390/s19122744
Received: 17 May 2019 / Revised: 10 June 2019 / Accepted: 15 June 2019 / Published: 18 June 2019
(This article belongs to the Special Issue Sensors Based NDE and NDT)
Investigations on flaw responses can benefit the nondestructive testing of cylinders using line-focused transducers. In this work, the system function, the wave beam model, and a flaw scattering model are combined to develop an ultrasonic measurement model for line-focused transducers to predict flaw responses in cylindrical components. The system function is characterized using reference signals by developing an acoustic transfer function for line-focused transducers, which works at different distances for both planar and curved surfaces. The wave beams in cylindrical components are modeled using a multi-Gaussian beam model, where the effects of wave mode conversion and curvatures of cylinders are considered. Simulation results of wave beams are provided to analyze their propagation behaviors. The proposed ultrasonic measurement model is certified from good agreement between the experimental and predicted signals of side-drilled holes. This work provides guidance for evaluating the detection ability of line-focused transducers in cylindrical component testing applications. View Full-Text
Keywords: ultrasonic measurement model; line focused transducer; multi-Gaussian beam model; wave mode conversion; cylindrical component ultrasonic measurement model; line focused transducer; multi-Gaussian beam model; wave mode conversion; cylindrical component
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Wang, W.; Liu, X.; Li, X.; Xu, G.; Zhang, S. Modeling Flaw Pulse-Echo Signals in Cylindrical Components Using an Ultrasonic Line-Focused Transducer with Consideration of Wave Mode Conversion. Sensors 2019, 19, 2744.

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