Acoustic equivalent point source models play an increasingly important role in automotive NVH processes. Such models may be used to represent the sound radiation from e.g. the tires, the engine, the air intake and the exhaust line of a car, in terms of a limited number of point sources placed on rigid source surfaces. The models may be employed e.g. in connection with measured transfer paths for source-path contribution analysis. A method for determining position-optimal acoustic equivalent point source models is presented. The point source positioning problem inherent in acoustic equivalent point source modeling is formulated as a combinatorial optimization problem, based on iterative selection of indicator transfer functions from a large pool of pre-determined candidate transfer functions. The candidate transfer functions are calculated numerically, using a reciprocal Boundary Element formulation. Solutions to the optimization problem are sought using a combination of Genetic Algorithm and Steepest Descent Local Search methods. Results are presented from applying the method to determine acoustic equivalent point source models of varying accuracy of a real tire running on a dynamometer.
Acoustic equivalent point source models of tires using combinatorial optimization
Akustisch äquivalente Punktquellenmodelle von Reifen mittels kombinatorischer Optimierung
2006
15 Seiten, 6 Bilder, 17 Quellen
Conference paper
Storage medium
English
Reifen (Fahrzeugreifen) , Akustik , Schallabstrahlung , mathematisches Modell , Rand-Elemente-Methode , Schallfeld , Übertragungsfunktion , Matrizenrechnung , Wellenzahl , Schallwelle , Schallgeschwindigkeit , Optimierung , Frequenzbereich , genetischer Algorithmus , experimentelle Untersuchung , akustische Messung , Mikrophon , Wellenlänge , Versuchsaufbau , Schalldruck
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