MODELING OF GUIDED WAVE PROPAGATION IN A LAYERED HALF-SPACE USING DISTRIBUTED POINT SOURCE METHOD

2009 ◽  
Author(s):  
Samik Das ◽  
Tribikram Kundu ◽  
Donald O. Thompson ◽  
Dale E. Chimenti
Keyword(s):  
Wave Propagation ◽  
Point Source ◽  
Half Space ◽  
Guided Wave ◽  
Source Method ◽  
Guided Wave Propagation ◽  
Distributed Point Source Method ◽  
Layered Half Space

Manipulation of the guided wave propagation in multilayered phononic plates by introducing interface delaminations

2021 ◽  
pp. 104266
Author(s):  
Yanzheng Wang ◽  
Elias Perras ◽  
Mikhail V. Golub ◽  
Sergey I. Fomenko ◽  
Chuanzeng Zhang ◽  
...  
Keyword(s):  
Wave Propagation ◽  
Guided Wave ◽  
Guided Wave Propagation

Ultrasonic Field Modeling in Multilayered Fluid Structures Using the Distributed Point Source Method Technique

2005 ◽  
Vol 73 (4) ◽  
pp. 598-609 ◽  
Author(s):  
Sourav Banerjee ◽  
Tribikram Kundu ◽  
Dominique Placko
Keyword(s):  
Point Source ◽  
Ultrasonic Field ◽  
Ultrasonic Transducers ◽  
Analytical Technique ◽  
Source Method ◽  
Fluid Systems ◽  
First Case ◽  
Fluid Layers ◽  
Distributed Point Source Method ◽  
Nonhomogeneous Fluids

In the field of nondestructive evaluation (NDE), the newly developed distributed point source method (DPSM) is gradually gaining popularity. DPSM is a semi-analytical technique used to calculate the ultrasonic field (pressure and velocity fields) generated by ultrasonic transducers. This technique is extended in this paper to model the ultrasonic field generated in multilayered nonhomogeneous fluid systems when the ultrasonic transducers are placed on both sides of the layered fluid structure. Two different cases have been analyzed. In the first case, three layers of nonhomogeneous fluids constitute the problem geometry; the higher density fluid is sandwiched between two identical fluid half-spaces. In the second case, four layers of nonhomogeneous fluids have been considered with the fluid density monotonically increasing from the bottom to the top layer. In both cases, analyses have been carried out for two different frequencies of excitation with various orientations of the transducers. As expected, the results show that the ultrasonic field is very sensitive to the fluid properties, the orientation of the fluid layers, and the frequency of excitation. The interaction effect between the transducers is also visible in the computed results. In the pictorial view of the resulting ultrasonic field, the interface between two fluid layers can easily be seen.

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