In this presentation, a new conceptual approach to the reduction of tire/road interaction noise will be described. The approach is based primarily on the use of wave number transform techniques to characterize tire vibration Measurements of the wave number spectrum of tire vibration have allowed the identification of the particular wave types that contribute to tire vibration and to radiated noise. These findings have important implications regarding tire modeling, and it will be shown that a composite, hybrid two-dimensional finite element model that includes effects of curvature and inflation may be used to predict tire vibration efficiently. Further, it will be shown that the vibration predictions may be used in combination with a boundary element code to predict the total sound power radiated by tire vibration. It has been found, for example, that the horn effect has a significant impact on the sound power radiated by tire vibration. It will be shown that below the horn effect cut-on frequency, almost all sound is radiated by fast, low-order circumferential components of tire vibration, but that above that frequency, many vibration components radiate efficiently. It will be suggested that tire/road interaction passby noise, in particular, can be reduced by a combination of tire structural modifications and tread design changes.
Tire noise, Wave propagation, Radiation modes, Tire vibration
Acoustics and Noise Control
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