摘要: |
It is now known that tire/road interaction noise is the major contributor to exterior automobile noise and establishes the background noise level in many environments. Thus, the reduction of tire/road noise is a major environmental noise issue today. Among the numerous tire noise mechanisms, tire vibration has been established as the primary source: i.e., a tire's tread block hits the road surface, and then the underlying reinforcing belts vibrate owing to the force transmitted through the tread block, resulting in sound radiation from the vibrating tire surface. In an attempt to identify the dominant tire noise sources, a sound field visualization procedure referred to as Nearfield Acoustical Holography was applied to a rolling tire: it has been shown that sound radiation originates close to the contact patch of a tire. An experimental procedure has also been introduced to identify the main characteristics of tire vibration. |