ON THE HORN EFFECT OF A TYRE/ROAD INTERFACE, PART II: ASYMPTOTIC THEORIES

✍ Scribed by C.-Y. KUO; R.A.G. GRAF; A.P. DOWLING; W.R. GRAHAM

• Publisher: Elsevier Science
• Year: 2002
• Tongue: English
• Weight: 210 KB
• Volume: 256
• Category: Article
• ISSN: 0022-460X
• DOI: 10.1006/jsvi.2001.4217

✦ Synopsis

In Part I, it was shown that boundary element method calculations could successfully be applied to determine sound ampli"cation by a tyre/road geometry. However, the computations are expensive, limited to frequencies below 2500 Hz, and provide little physical insight. In Part II, two supplementary asymptotic approaches are developed; a ray theory for high frequencies and a compact body scattering model for low frequencies. When tested on a representative tyre geometry, these methods are found to have excellent predictive capabilities, at frequencies above 3 kHz and below 300 Hz respectively. Furthermore, the ray theory shows that the neglect of curvature in Ronneberger's wedge model (1989 =orkshop on Rolling Noise Generation, Institut fur ¹echnische Akustik, ¹echnische ;niversitat, Berlin) leads to erroneous ampli"cation levels and interference e!ects, and the scattering model intriguingly predicts that low frequency ampli"cation increases with belt width independently of the tyre diameter. Lastly, this work con"rms the importance of numerical calculations for the intermediate frequencies, where tyre noise is most signi"cant.