HORN AMPLIFICATION AT A TYRE/ROAD INTERFACE - PART II: RAY THEORY AND EXPERIMENT
Near the tyre/road contact area, the road surface and the tyre belt form a horn-like geometry. It provides a significant amplification mechanism and influences the acoustic wave propagation. Experimental measurements show that the horn effect is responsible for about 10-20dB increase in noise level. While the low frequency range can be successfully solved by applying the boundary element method, the numerical scheme encounters difficulties in resolving high frequency sound, because of the massive mesh grids then required. In this high frequency limit, ray theory is appropiate to model and provide physical insight into the horn effect. We first validate the ray theory approach with measurements on a wedge. The agreement is excellent except for low frequencies (below 1500Hz) where the ray theory approximation is no longer valid. The tyre is then modeled as a cylinder, whose surface curvature can be incorporated into the theory. Detailed quantitative agreement is achieved between the theory and measurement for frequencies above 3kHz. For the covering abstract see IRRD E104312.
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Availability:
- Find a library where document is available. Order URL: http://worldcat.org/isbn/0962207233
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Corporate Authors:
Institute of Noise Control Engineering
Iowa State University, 210 Marston Hall
Ames, IA United States 50011-2153 -
Authors:
- KUO, C Y
- GRAF, RAG
- DOWLING, A P
- GRAHAM, W R
- Conference:
- Publication Date: 1999
Language
- English
Media Info
- Features: References;
- Pagination: p. 125-30
Subject/Index Terms
- TRT Terms: Mathematical analysis; Mathematical models; Measurement; Noise; Rolling contact
- ITRD Terms: 6471: Analysis (math); 5440: Contact (tyre road); 6473: Mathematical model; 6136: Measurement; 2492: Noise
- Subject Areas: Environment;
Filing Info
- Accession Number: 00790177
- Record Type: Publication
- Source Agency: Transport Research Laboratory
- ISBN: 0-9622072-3-3
- Files: ITRD
- Created Date: Apr 11 2000 12:00AM