An experimental procedure to obtain sound power level of tyre/road noise under Coast-By conditions

Authors:  Nuria Campillo-Davo, Ramon Peral-Orts, Emilio Velasco-Sanchez, Hector Campello-Vicente

Abstract:
The rolling noise from tyre–pavement interaction represents the greatest sound contribution from a vehicle when cruising at a high speed. To evaluate the sound levels from this source, existing standardized methods that establish different measurement procedures in both the immediate tyre surroundings, for example the Close-Proximity method, as well as at greater distances, as the Coast-By method. A fundamental parameter that can quantify the sound generation of a source is its sound power level. The standardized methods establish procedures to measure the sound pressure level but not the power level of a tyre as a noise source. For this reason, this paper presents a novel methodology based on sound pressure measurements to obtain the sound power level that a vehicle emits in Coast-By conditions, where noise is generated at tyre/road interaction. The paper describes the testing procedure used to obtain the sound power level, and it is accompanied by a mathematical simulation that studies the feasibility of the proposal. Finally, the proposed methodology is further validated through a field study.

Keywords:
Tyre
Noise
Power
Coast-By

Published in: Applied Acoustics (Volume 74, Issue 5, May 2013)

Publisher: Elsevier

ISSN Information: 0003-682X

An experimental procedure to obtain sound power level of tyre/road noise under Coast-By conditions

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