A comparison between the boundary element method and the wave superposition approach for the analysis of the scattered fields from rigid bodies and elastic shells

1991 ◽  
Vol 89 (5) ◽  
pp. 2185-2196 ◽  
Author(s):  
Russel D. Miller ◽  
E. Thomas Moyer ◽  
Hanson Huang ◽  
Herbert Überall
Keyword(s):  
Boundary Element Method ◽  
Boundary Element ◽  
Rigid Bodies ◽  
Elastic Shells ◽  
Wave Superposition ◽  
Scattered Fields ◽  
Element Method

A third-order boundary element method for scattering of elastic shells

1997 ◽  
Author(s):  
M. Gennaretti ◽  
A. Giordani ◽  
L. Morino ◽  
M. Gennaretti ◽  
A. Giordani ◽  
...  
Keyword(s):  
Boundary Element Method ◽  
Boundary Element ◽  
Third Order ◽  
Elastic Shells ◽  
Element Method

scholarly journals Efficient isogeometric boundary element method for analysis of acoustic scattering from rigid bodies

2020 ◽  
Vol 147 (5) ◽  
pp. 3275-3284
Author(s):  
A. M. A. Alsnayyan ◽  
J. Li ◽  
S. Hughey ◽  
A. Diaz ◽  
B. Shanker
Keyword(s):  
Boundary Element Method ◽  
Boundary Element ◽  
Acoustic Scattering ◽  
Rigid Bodies ◽  
Element Method

An Indirect Boundary Element Method for Computing Sound Field

2012 ◽  
Vol 476-478 ◽  
pp. 1173-1177
Author(s):  
Sheng Yao Gao ◽  
De Shi Wang
Keyword(s):  
Integral Equation ◽  
Boundary Element Method ◽  
Boundary Element ◽  
Acoustic Field ◽  
Boundary Surface ◽  
Sound Field ◽  
Boundary Integral ◽  
Superposition Method ◽  
Wave Superposition ◽  
Element Method

Computing sound field from an arbitrary radiator is of interest in acoustics, with many significant applications, one that includes the design of classical projectors and the noise prediction of underwater vehicle. To overcome the non-uniqueness of solution at eigenfrequencies in the boundary integral equation method for structural acoustic radiation, wave superposition method is introduced to study the acoustics. In this paper, the theoretical backgrounds to the direct boundary element method and the wave superposition method are presented. The wave superposition method does not solve the Kirchoff-Helmholtz integral equation directly. In the approach a lumped parameter model is estabiled from spatially averaged quantities, and the numerical method is implemented by using the acoustic field from a series of virtual sources which are collocated near the boundary surface to replace the acoustic field of the radiator. Then the sound field over the of a pulsating sphere is calculated. Finally, comparison between the analytical and numerical results is given, and the speed of solution is investigated. The results show that the agreement between the results from the above numerical methods is excellent. The wave superposition method requires fewer elements and hence is faster, which do not need as high a mesh density as traditionally associated with BEM.

A BOUNDARY-ELEMENT METHOD FOR ATOMIZATION OF A FINITE LIQUID JET

1995 ◽  
Vol 5 (6) ◽  
pp. 621-638 ◽  
Author(s):  
J. H. Hilbing ◽  
Stephen D. Heister ◽  
C. A. Spangler
Keyword(s):  
Boundary Element Method ◽  
Boundary Element ◽  
Liquid Jet ◽  
Element Method

Application of the Boundary Element Method and Modal Analysis to Tire Acoustics Problems

1993 ◽  
Vol 21 (2) ◽  
pp. 66-90 ◽  
Author(s):  
Y. Nakajima ◽  
Y. Inoue ◽  
H. Ogawa
Keyword(s):  
Finite Element ◽  
Boundary Element Method ◽  
Boundary Element ◽  
Acoustic Radiation ◽  
Traffic Noise ◽  
Noise Prediction ◽  
Prediction System ◽  
Tire Noise ◽  
Acoustic Contribution ◽  
Element Method

Abstract Road traffic noise needs to be reduced, because traffic volume is increasing every year. The noise generated from a tire is becoming one of the dominant sources in the total traffic noise because the engine noise is constantly being reduced by the vehicle manufacturers. Although the acoustic intensity measurement technology has been enhanced by the recent developments in digital measurement techniques, repetitive measurements are necessary to find effective ways for noise control. Hence, a simulation method to predict generated noise is required to replace the time-consuming experiments. The boundary element method (BEM) is applied to predict the acoustic radiation caused by the vibration of a tire sidewall and a tire noise prediction system is developed. The BEM requires the geometry and the modal characteristics of a tire which are provided by an experiment or the finite element method (FEM). Since the finite element procedure is applied to the prediction of modal characteristics in a tire noise prediction system, the acoustic pressure can be predicted without any measurements. Furthermore, the acoustic contribution analysis obtained from the post-processing of the predicted results is very helpful to know where and how the design change affects the acoustic radiation. The predictability of this system is verified by measurements and the acoustic contribution analysis is applied to tire noise control.

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