Research On The Horn Effect Of The Tyer/road Interface

In recent years,as the continues increase of the number of cars in city,The traffic noise is now becoming more and more serious. Tire noise pollution is affecting people’s normal life. Tyre/Road noise is one of the most important part of the traffic noise.Near the tyer/road contact area, the road surface and the tyer belt form a horn-like geometry, which provides a significant amplifucation mechanism for sound sources.we call this is horn effect. At present, We still not doing enough research in this field.In this paper, on the basis of the summarize of the research achievements of predecessors, we do some analysis and compares the differences of different types of decorative pattern of tire noise amplification, and research the sound directivity of the horn effect. We also compared the different decorative pattern parameters on the influence of noise distribution.We established three different pattern tyres and three types of the same pattern, different decorative pattern parameters of tire. First, we have three different decorative pattern tyre calculated to confirm the existence of the horn effec, analyze the different point with axial distance and the circumferential distance change of the law, understanding to sound directivity; Second, we analysis influence law of horn effect with the geometric parameters of pattern groove by Acoustic.We can get the following conclusions: If there is a tire,the horn effect of the tyre/road interference can provide a significant amplifucation mechanism for sound sources due to the acoustic scattering. The closer distance from the axial of the tire,the amplication by the horn effect can be stronger; The closer distance from the circumferential of the tire, the amplication by the horn effect can be stronger; Noise directivity are mainly concentrated in the tyre is within the range of the Angle of 60°The geometry parameters of the pattern groove also affect the acoustic field, the results as follows: whether the draft Angle and groove depth, acoustic field distribution of noise has no obvious influence at a lower frequency; when the frequency becomes higher, with the increase of draft Angle, the amplification becomes stronger, whereas the weaker; With the increase of the depth of the pattern groove, the amplification becomes weaker, whereas the stronger; if the tire crown is arc shape, the amplification of tire noise can be reduced.