Three‐dimensional waves in layered media with nonparallel and curved interfaces: A theoretical approach
作者:
Elfgard Kühnicke,
期刊:
The Journal of the Acoustical Society of America
(AIP Available online 1996)
卷期:
Volume 100,
issue 2
页码: 709-716
ISSN:0001-4966
年代: 1996
DOI:10.1121/1.416219
出版商: Acoustical Society of America
关键词: SOUND WAVES;WAVE PROPAGATION;THREE−DIMENSIONAL CALCULATIONS;POINT SOURCES;INTEGRAL TRANSFORMATIONS;CALCULATION METHODS;BOUNDARY CONDITIONS
数据来源: AIP
摘要:
A calculation method is presented for transducer‐generated three‐dimensional, transient wave fields in layered media with curved interfaces by using a separation approach in combination with integral transform methods and point source synthesis. The transducer‐specimen module is decomposed into different layers and the wave propagation is calculated separately in each layer. To simplify the boundary conditions, the existence of a thin liquid layer between two solid media is used. Using generalized ray theory it can be shown that the normal stress on the interface caused by an incident wave provides sufficient information to calculate the transmitted waves in the adjacent media. Two different functions for the point sources of the exciting element and the source function for normal stress are derived. By means of a source function for normal stress, the transmitted transient wave can be determined from the normal‐stress distribution on the interface. The method is demonstrated by two examples.
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