Computer-assisted-design software for muffled assembled structures

Abstract

Effective noise reduction at the source requires a thorough comprehension of complex vibrational and acoustic phenomena which are, in general, inadequately understood. Providing engineers with more information of a practical nature would radically increase our ability to solve these problems. This project was undertaken to develop a tool to fill this need. The resulting Windows/95/98/NT CVAC software produces a comprehensive digital model of the vibro-acoustic low-frequency response of a series of plates, taking into account all relevant variables (data entry, networking, wide choice of design and output parameters). Its innovative calculation method not only is more accurate but also reduces calculation times while relieving users of the need to take into account networking and the problems associated with finite-structure-elements codes (cost, expertise, availability, validity, etc.). With this user-friendly tool, engineers can now design and produce quieter equipment for a variety of economic sectors and work environments.

Produced Under this Project

Scientific Publications

Acoustic radiation of a unbaffled vibrating plate with general elastic boundary conditions
Atalla N., Nicolas J., Gauthier C.
Source :
Journal of Acoustical Society of America, vol. 99, no 3, 1996, p. 1484-1494
Effects of shear deformation and rotary inertia on the free vibration of a rotating annular plate
Côté A., Atalla N., Nicolas J.
Source :
Journal of Vibration and Acoustics, vol. 119, 1997, p. 641-643
A numerical algorithm for double surface integrals over quadrilaterals
Wang W., Atalla N.
Source :
Numerical Methods in Engineering, vol. 13, 1997, p. 8585-8590
A unique boundary integral approach for acoustic radiation of axisymmetric bodies with arbitrary boundary conditions
Wang W., Atalla N., Nicolas J.
Source :
Journal of the Acoustical Society of America, vol. 101, no 3, 1997, p. 1468-1478
A novel acceleration method for the variational boundary element approach based on multipole expansions
Tournour M., Atalla N.
Source :
International Journal for Numerical Methods in Engineering, vol. 42, 1998, p. 1199-1214
A multiple multipole expansion approach for predicting the sound power of vibrating structures
Atalla N., Winckelmans G., Sgard F.
Source :
Acta Acustica, vol. 85, no 1, 1999, p. 47-53
Validation, performance and convergence of free-interface component mode synthesis
Tournour M., Atalla N., Chiello O., Sgard F.
Source :
Computers and Structures, vol. 79, no 2, 2001, p. 1861-1876
Pseudo-static corrections for the forced vibroacoustic response of a structure-cavity system
Tournour M., Atalla N.
Source :
Journal of the Acoustic Society of America, vol. 107, no 5, 2000, p. 2379-2386
Vibroacoustic behavior of an elastic box using state-of-the-art FEM-BEM approach
Tournour M., Atalla N.
Source :
Noise Control Engineering Journal, vol. 46, no 3, 1998, p. 83-90
The performance of a boundary integral approach for acoustic radiation of axisymmetric elongated bodies with arbitrary boundary conditions valid for all wavenumbers
Atalla N., Sgard F.
Source :
in Symposium on innovative computational methods applied to linear structural mechanics / ASME (November 15–20, 1998 : Anaheim, California), 1998
Multipole expansion of the boundary integral using variational boundary elements
Tournour M., Atalla N.
Source :
in Symposium on innovative computational methods applied to linear structural mechanics / ASME (November 15–20, 1998 : Anaheim, California), 1998
Vibroacoustic behavior with total or partial layer of constrained viscoelastic
Nicolas J., Foin O., Atalla N., Mercier B.
Source :
133rd Meeting of the Acoustical Society of America (133rd : June 16-20, 1997 : Penn State, Pennsylvania), 1997
A novel acceleration method for the variational boundary element approach based on multiple expansion
Tournour M., Atalla N.
Source :
133rd Meeting of the Acoustical society of America (June 16-20, 1997 :Penn State, Pennsylvania), 1997

Additional Information

Type: Project

Number: 0095-0100

Status: Completed

Year of completion: 1999

Research Field: Mechanical and Physical Risk Prevention

Team:

Jean Nicolas (Université de Sherbrooke)
Noureddine Atalla (Université de Sherbrooke)