View in EDS

Visualization of surface wave generation and tail wave formation in acoustic Wood anomalies.

Saved in:
Bibliographic Details
Title: Visualization of surface wave generation and tail wave formation in acoustic Wood anomalies.
Authors: Fujii, Kotaro1 (AUTHOR), Nakamoto, Hiroyuki1 (AUTHOR) nakamoto@panda.kobe-u.ac.jp, Guy, Philippe2 (AUTHOR), Uchimoto, Tetsuya3,4 (AUTHOR)
Source: Journal of the Acoustical Society of America. Mar2026, Vol. 159 Issue 3, p2477-2486. 10p.
Subjects: Surface waves (Fluids), Ultrasonic testing, Surfaces (Physics), Theory of wave motion, Sound waves, Waves (Physics), Finite difference time domain method
Abstract: Acoustic Wood anomalies are phenomena characterized by sharp amplitude peaks and dips at specific frequencies in the spectra of the waves reflected from periodic surfaces. Theoretical studies proposed the double mode conversion theory, suggesting bulk waves convert to surface waves at periodic rough surfaces and reconvert to bulk waves, which then interfere with specular reflections (main waves) as delayed reflected components (tail waves). However, experimental validation remains incomplete. This study clarifies the relationship between surface waves and tail waves through visualization of wave propagation processes and identifies causes of changes in tail wave formation due to periodic surface geometry. Pulse-echo experiments were conducted using carbon steel specimens with rectangular periodic profiles of varying pitch and depth. Finite-difference time-domain simulations visualized ultrasonic wave propagation under identical experimental conditions. Simulation data showed good agreement with experimental data, validating the simulation approach. Amplitude spectral analysis revealed that the surface waves and tail waves had common frequency characteristics, confirming the double mode conversion assumption. The simulations successfully visualized surface waves generation, propagation, and reconversion to bulk waves, demonstrating tail wave formation from surface waves in detail. [ABSTRACT FROM AUTHOR]
Copyright of Journal of the Acoustical Society of America is the property of American Institute of Physics and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
Description
Abstract:Acoustic Wood anomalies are phenomena characterized by sharp amplitude peaks and dips at specific frequencies in the spectra of the waves reflected from periodic surfaces. Theoretical studies proposed the double mode conversion theory, suggesting bulk waves convert to surface waves at periodic rough surfaces and reconvert to bulk waves, which then interfere with specular reflections (main waves) as delayed reflected components (tail waves). However, experimental validation remains incomplete. This study clarifies the relationship between surface waves and tail waves through visualization of wave propagation processes and identifies causes of changes in tail wave formation due to periodic surface geometry. Pulse-echo experiments were conducted using carbon steel specimens with rectangular periodic profiles of varying pitch and depth. Finite-difference time-domain simulations visualized ultrasonic wave propagation under identical experimental conditions. Simulation data showed good agreement with experimental data, validating the simulation approach. Amplitude spectral analysis revealed that the surface waves and tail waves had common frequency characteristics, confirming the double mode conversion assumption. The simulations successfully visualized surface waves generation, propagation, and reconversion to bulk waves, demonstrating tail wave formation from surface waves in detail. [ABSTRACT FROM AUTHOR]
ISSN:00014966
DOI:10.1121/10.0042999