IDENTIFICATION OF THE AIRBORNE COMPONENT OF TYRE-INDUCED VEHICLE INTERIOR NOISE

The dominant noise generation mechanism of a tyre below 1 kHz is the t yre wall vibration caused by collisions between the tread blocks and t he road. This paper is concerned with the identification of the transm ission path of this tyre noise into a vehicle. A stationary tyre is ex cited by an electrodynamic shaker and a description of surface velocit y is obtained. A reciprocity technique is used to measure the transfer functions which describe the transmission of sound from points on a t yre wall to a point inside a vehicle. The combination of these measure ments offers a means of separating airborne noise from structure-borne noise while, at the same time, providing information on the relative contribution of various regions of this vibrating tyre surface to vehi cle interior noise. (C) 1997 Elsevier Science Ltd.