Tire noise has attracted more and more attention recently from auto manufacturers. The emerging electric vehicle market requires a higher standard regarding tire noise because of the significant reduction of power train noise. Quiet tires are very important to the vehicle interior noise levels and affect the passengers riding experiences. In addition, tire noise radiation can also negatively influence the exterior environment in high population density areas. Here, in contrast with the usual focus on tire noise below 600 Hz, the work was focused on a 2-dimensional analytical tire model, which allows the study of relatively high frequency structural vibration in tires. Recent investigations on wave propagation in tires have revealed the potential significance of a high frequency structural wave, which begins to propagate in the frequency range between 1 kHz and 1.3 kHz and is believed to be associated with a bead-to-bead shearing of the sidewalls and treadband. Although the motion associated with this mode is primarily in-plane, it can nonetheless radiate effectively owing to its very high phase speed. In addition, the horn effect is also most prominent in this frequency range and could further amplify the noise generated by this type of wave. The beam-like model of the treadband considered in this study has stiffness supported boundaries to represent the tire sidewalls, and the treadband structure supports both out-of-plane flexural motion and in-plane longitudinal motion. Both free vibration and forced vibration will be investigated, by the wave propagation method.
Tire noise, Tire vibration, Wave propagation
Acoustics and Noise Control
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