In this paper, the vibro-acoustic transmission characteristics are investigated in the view point of the airborne noise in the interior cavity due to the tire wall vibrations. The analysis is carried out by categorizing the airborne noise transfer path into two separate consecutive events. First the noise transfer from the vibrating tire wall to the exterior car panels is modeled by using the direct boundary element method (BEM). To this end, after discretizing the whole geometry of exterior body panels, tires and ground into BEM models, vibro-acoustic transfer characteristics are investigated at several frequency components associated with the cavity resonances of tires. Here, cavity resonance frequencies of tires are estimated by BEM, and the distribution of tire wall vibrations (excited by a special vibro-acoustic source) is measured at those frequencies. Acoustic pressure distribution over the exterior car panels can thus be predicted and the contribution of local vibrational velocity of the tire wall to car panels are estimated by the vectorial summation of resultant acoustic pressures. Second, vibro-acoustic transfer functions between different points of car panels and the position of the receiver ear in the car interior is measured by utilizing the vibro-acoustic reciprocity principle. Combining these two transmission path models in series, the airborne noise transmission from tire wall vibration to the driver's ear can be analyzed. From the results, contributions of the tire wall vibration to the interior noise can be estimated and the main transmission paths of airborne noise can be identified.
Modeling of airborne tire noise transmission into car interior by using the vibro-acoustic reciprocity and the boundary element method
Modell der Übertragung des vom Autoreifen erzeugten Luftschalls in den Fahrgastraum auf der Grundlage der schwingungs-akustischen Reziprozität und der Grenzflächenelementemethode
1997
7 Seiten, 11 Bilder, 6 Quellen
Conference paper
English
Simulationsmodell , Schallemission , Autoreifen , Schallquelle , Kraftfahrzeug , Innenraum , Schallfortpflanzung , Karosserie , Schalldruck , Druckverteilung , Schwingungsmessung , Versuchsanlage , Luftschall , mathematisches Modell , Frequenzspektrum , Laufeigenschaft , Schwingungsanalyse , Schallübertragung
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