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On the Sound Radiation from Tyres

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Due to the geometry between tyre and road surface sources close to the contact patch are amplified by the horn like geometry. This so-called horn effect was explained by Ronneberger [1] and is very prominent in the plane of the tyre. A two-dimensional model for the sound radiation from tyres based on a multipole synthesis is applied to study this effect. The model as presented in [2] is evaluated by measurements of the horn effect for a tyre placed on the road surface. Theoretical results are compared with measurements for the tyre on a rigid ground and on a ground surface with a locally reacting impedance in the form of absorber material.

The model is applied to study the influence of the geometry in the contact area and the acoustic properties of the road surface on the radiated sound pressure. Results show that an increase of the distance between tyre and the actual reflecting surface of the road decreases the radiated sound power at higher frequencies (above 800 Hz). This fact can be observed in measurements for both stationary tyre and might also be present for rolling tyres on a very rough road where the tyre is running on the roughness peaks above the reflecting plane.

Although the model can be used to study the radiation for tyres rolling on a test drum when measuring in the plane of the tyre, the model can not predict the radiation in a pass-by or coast-by situation due to its limitations to two dimensions. While the amplification due to the horn effect in the plane of the tyre is in the order of 20 dB, in other directions the amplification is substantially lower. However, results of the coast- by test are determined by contributions outside this plane as shown by measurements and simple estimations. This has to be taken into account when comparing results from the two-dimensional model with field measurements.
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Document Type: Research Article

Publication date: 2000-09-01

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  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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