0
TECHNICAL PAPERS

Patch Transfer Functions as a Tool to Couple Linear Acoustic Problems

[+] Author and Article Information
Morvan Ouisse

 LVA-INSA Lyon, 25 bis Avenue Jean Capelle, Villeurbanne, 69100 Francemorvan.ouisse@univ-fcomte.fr

Laurent Maxit, Christian Cacciolati, Jean-Louis Guyader

 LVA-INSA Lyon, 25 bis Avenue Jean Capelle, Villeurbanne, 69100 France

J. Vib. Acoust 127(5), 458-466 (Dec 07, 2004) (9 pages) doi:10.1115/1.2013302 History: Received June 01, 2004; Revised December 07, 2004

A method to couple acoustic linear problems is presented in this paper. It allows one to consider several acoustic subsystems, coupled through surfaces divided in elementary areas called patches. These subsystems have to be studied independently with any available method, in order to build a database of transfer functions called patch transfer functions, which are defined using mean values on patches, and rigid boundary conditions on the coupling area. A final assembly, using continuity relations, leads to a very quick resolution of the problem. The basic equations are developed, and the acoustic behavior of a cavity separated in two parts is presented, in order to show the ability of the method to study a strong-coupling case. Optimal meshing size of the coupling area is then discussed, some comparisons with experiments are shown, and finally a complex automotive industrial case is presented.

Copyright © 2005 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 1

Example of basic acoustic problem

Grahic Jump Location
Figure 2

Rigid walled cavity

Grahic Jump Location
Figure 3

Four patches and four modes

Grahic Jump Location
Figure 4

Effects of ill-conditioning due to the number of modes on FRFs

Grahic Jump Location
Figure 5

Convergence of pressure vs number of patches. Dotted line: reference calculation. The vertical line indicates the λ∕2 limit.

Grahic Jump Location
Figure 6

Pressure error at listening point vs number of patches along x and y axes

Grahic Jump Location
Figure 7

Description of the “ground-up box” structure

Grahic Jump Location
Figure 8

Image source theory illustration and Rayleigh simplified approach

Grahic Jump Location
Figure 9

Comparisons between calculation techniques

Grahic Jump Location
Figure 10

Comparisons between meshing methodologies and experiments

Grahic Jump Location
Figure 11

Front part of Alfa 156

Grahic Jump Location
Figure 12

Coupling areas for PTF application

Grahic Jump Location
Figure 13

Patches definition on coupling areas

Grahic Jump Location
Figure 14

Patches definition on absorbing areas

Grahic Jump Location
Figure 15

Comparisons between calculations and experiments, in terms of FRF, inside the cavity and at a pass-by microphone

Grahic Jump Location
Figure 16

Comparison between experiments (dashed line) and simulations (continuous line) of radiated noise at a pass-by microphone location

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In