A numerical pass-by noise simulation process is presented in this paper. Each major source is represented by a generic source in the computations. Velocity boundary conditions are evaluated on each generic source in order to recreate the prescribed acoustic field that characterises each source. The new development is based on evaluating transfer functions between velocity boundary conditions on the surface of the generic source and the field points where the baseline acoustic field is defined. The computation of the transformation matrix is based on the IBEM. A SVD algorithm is employed for computing the boundary conditions on the generic source and reconstructing the field. The generic sources for the main contributors of the pass-by noise are combined with a vehicle model for a complete pass-by noise simulation. The developed numerical techniques are validated through correlation to analytical solutions and through comparison between numerical results and test data for both component level and system level analyses. Specifically, the numerical capability to define an individual generic source is validated by comparing the actual and the computationally reconstructed acoustic field for 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 separate driving conditions. Good correlation is observed between the test data and numerical results for all the analyses. Finally, the unique capabilities of the computational process to identify the most important contributor and the most critical frequency to the LHS and RHS overall dBA level are demonstrated.
Development and validation of a computational process for pass-by noise simulation
Entwicklung und Validierung eines Berechnungsverfahrens für Geräuschsimulation von vorbeifahrenden Fahrzeugen
International Journal of Vehicle Design ; 34 , 1 ; 12-34
2003
23 Seiten, 17 Bilder, 2 Tabellen, 24 Quellen
Article (Journal)
English
Algorithmus , Randbedingung , Rechnersimulation , Fahrzeuggeräusch , Motorgeräusch , Geräuschquelle , numerisches Verfahren , Validierung , Rand-Elemente-Methode , Übertragungsfunktion , Schallfeld , Fahrgeschwindigkeit , theoretisches Modell , Schalldruck , Anwendung im Fahrzeugbau , Anwendung im Motorenbau
Development and Validation of a Computational Process for Pass-By Noise Simulation
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