The Energy Boundary Element Method (EBEM) was originally developed for computing acoustic radiation at high frequencies from a set of incoherent acoustic intensity boundary conditions prescribed on the surface of the radiator. The acoustic energy density and intensity constitute the primary variables for the EBEM. The corresponding integral formulation is developed similarly to the conventional boundary element method. Another area where the EBEM has also been applied is in computing the acoustic field around an automobile that originates from typical airborne noise sources (e.g. tire patches, engine, exhaust, etc.) in the frequency range between 400 Hz - 10000 Hz. The acoustic field computed by the EBEM can provide the acoustic loading information for an energy based (Energy Finite Element Method (EFEM) or Statistical Energy Analysis (SEA)) interior airborne noise analysis. This new computational capability can eliminate expensive and time consuming tests conducted for characterizing the acoustic field around a vehicle for airborne noise considerations. Theoretical aspects of the EBEM are discussed in this paper. Comprehensive vehicle analyses where test data are compared to simulation results for the acoustic field generated from an acoustic source placed at several different locations are presented. It is demonstrated that the EBEM can capture correctly the acoustic field around a vehicle and perform challenging analyses reliably with small computational resources. A case study is presented for demonstrating how EBEM and EFEM can be combined for a complete airborne noise simulation.


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    Titel :

    Energy base boundary element method for computing the exterior acoustic field for vehicle airborne noise analysis


    Weitere Titelangaben:

    Berechnung des akustischen Außenfeldes mit einem energiebasierten Randelemente-Verfahren für die Analyse von Fahrzeuggeräuschen


    Beteiligte:


    Erscheinungsdatum :

    2006


    Format / Umfang :

    11 Seiten, 14 Bilder, 12 Quellen


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Datenträger


    Sprache :

    Englisch





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