Numerical study of sound transmission loss using an indirect boundary element method

2008 ◽  
Vol 123 (5) ◽  
pp. 3500-3500
Author(s):  
Matthew Cassidy ◽  
Richard K. Cooper ◽  
Richard Gault ◽  
Jian Wang
Keyword(s):  
Boundary Element Method ◽  
Boundary Element ◽  
Transmission Loss ◽  
Numerical Study ◽  
Sound Transmission ◽  
Sound Transmission Loss ◽  
Indirect Boundary Element Method ◽  
Element Method

A numerical study on the sound transmission loss of HST aluminum extruded panel

2020 ◽  
Vol 68 (5) ◽  
pp. 367-377
Author(s):  
Xu Zheng ◽  
Peilin Ruan ◽  
Le Luo ◽  
Yi Qiu ◽  
Zhiyong Hao
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Performance Optimization ◽  
High Speed ◽  
Transmission Loss ◽  
Numerical Study ◽  
Sound Transmission ◽  
Sound Transmission Loss ◽  
Wide Range ◽  
Element Method

Aluminum is a light, strong, and corrosion-resistant material. Its extruded form, the aluminum extruded panel, consists of two aluminum plates with truss core, which can be applied in a wide range of engineering areas. In this work, the structure-acoustic coupling finite element method (FEM) is employed to analyze the sound transmission through high-speed train (HST) aluminum extruded panels. The automatically matched layer (AML) is used to simulate the non-reflective boundary condition. It is found that the predicted sound transmission loss (STL) is in good agreement with the experimental results and the prediction accuracy of the finite element method can be further verified. Based on this proposed method, a parametric study is carried out to investigate how the structure parameters affect the STL. The results suggest that the rib angle exhibits a greater effect on STL in the above-middle frequency area where the modal density is high. The increase in the height between the panels will lead to a higher STL overall value of the aluminum extruded panel and make the STL dips move toward higher frequencies, while the increase of the rib thickness will drive the STL dips to an opposite direction. Finally, the STLs of the aluminum extruded panel in different regions of the train body are comprehensively analyzed. The highest overall value of STL is found in the flat-top region, whereas the lowest value appears in the curve-top region. Overall, the results in this article can provide valuable implications for the noise performance optimization of HST.

Boundary element method in numerical study of three-dimensional Stokes flows in channels of arbitrary shape

2012 ◽  
Vol 9 (1) ◽  
pp. 94-97
Author(s):  
Yu.A. Itkulova
Keyword(s):  
Boundary Element Method ◽  
Boundary Element ◽  
Cross Section ◽  
Numerical Study ◽  
Three Dimensional ◽  
Cylindrical Tube ◽  
Variable Cross Section ◽  
Variable Cross ◽  
Periodic Flows ◽  
Element Method

In the present work creeping three-dimensional flows of a viscous liquid in a cylindrical tube and a channel of variable cross-section are studied. A qualitative triangulation of the surface of a cylindrical tube, a smoothed and experimental channel of a variable cross section is constructed. The problem is solved numerically using boundary element method in several modifications for a periodic and non-periodic flows. The obtained numerical results are compared with the analytical solution for the Poiseuille flow.

Rayleigh-wave scattering by shallow cracks using the indirect boundary element method

2009 ◽  
Vol 6 (3) ◽  
pp. 221-230 ◽  
Author(s):  
R Ávila-Carrera ◽  
A Rodríguez-Castellanos ◽  
F J Sánchez-Sesma ◽  
C Ortiz-Alemán
Keyword(s):  
Boundary Element Method ◽  
Rayleigh Wave ◽  
Boundary Element ◽  
Wave Scattering ◽  
Indirect Boundary Element Method ◽  
Rayleigh Wave Scattering ◽  
Element Method

Prediction of Acoustical Behavior in Cavities Using an Indirect Boundary Element Method

1987 ◽  
Vol 109 (1) ◽  
pp. 22-28 ◽  
Author(s):  
C. R. Kipp ◽  
R. J. Bernhard
Keyword(s):  
Boundary Condition ◽  
Boundary Element Method ◽  
Boundary Element ◽  
Point Sources ◽  
Cavity Pressure ◽  
Impedance Boundary ◽  
Indirect Boundary Element Method ◽  
Sound Fields ◽  
Pressure Distributions ◽  
Element Method

An indirect boundary element method is developed to predict sound fields in acoustical cavities. An isoparametric quadratic boundary element is utilized. The formulations of pressure, velocity and/or impedance boundary conditions are developed and incorporated into the method. The capability to include acoustic point sources within the cavity is also implemented. The method is applied to the prediction of sound fields in spherical and rectangular cavities. All three boundary condition types are verified. Cases having a point source within the cavity domain are also studied. Numerically determined cavity pressure distributions and responses are presented. The numerical results correlate well with available analytical results.

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