Title: Development and validation of a computational process for pass-by noise simulation

Authors: Zhidong Zhang, Nickolas Vlahopoulos, T. Allen, K.Y. Zhang

Addresses: Department of Naval Architecture and Marine Engineering, The University of Michigan, 2600 Draper Road, Ann Arbour MI 48109-2145, USA. ' Department of Naval Architecture and Marine Engineering, The University of Michigan, 2600 Draper Road, Ann Arbour MI 48109-2145, USA. ' Body/Chassis NVH, Squeak/Rattle Prevention Research and Vehicle Technology, Ford Motor Company, 20000 Rotunda Drive, Bldg. SRL MD2636, Dearborn, MI 48121, USA. ' Vehicle Integration Supervisor, Amazon Program, Ford Motor Company, MSXFD, cube B-137A, MD89, 17425 Federal Drive, Allen Park, MI 48101, USA

Abstract: The Indirect Boundary Element Analysis is employed for developing a computational pass-by noise simulation capability. An acoustic field reconstruction process is developed in order to generate the definition of the main pass-by noise sources in a numerical model. Numerical boundary element models that characterise the individual sources are combined with a vehicle model for developing a system model for pass-by noise simulation. The numerical algorithm for defining generic sources is validated initially by employing analytical solutions. The numerical techniques are also validated through comparison between numerical results and test data for component level and system level analyses. Specifically, the generic source definition capability is validated by comparing the actual and the computationally reconstructed acoustic field for an engine intake manifold. The overall pass-by noise simulation capability is validated by computing the maximum overall sound pressure level for a vehicle under two different driving conditions.

Keywords: vehicle model; pass-by noise simulation; indirect boundary element method.

DOI: 10.1504/IJVD.2004.003892

International Journal of Vehicle Design, 2004 Vol.34 No.1, pp.12 - 34

Published online: 10 May 2004 *

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