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

• Published in: Applied acoustics 2013-05, Vol.74 (5), p.718-727
• Main Authors: Campillo-Davo, Nuria, Peral-Orts, Ramon, Velasco-Sanchez, Emilio, Campello-Vicente, Hector
• Format: Article
• Language: English
• Subjects: Acoustics; Applied sciences; Coast-By; Exact sciences and technology; Fundamental areas of phenomenology (including applications); Ground, air and sea transportation, marine construction; Noise; Noise: its effects and control; Physics; Power; Road transportation and traffic; Tyre
• ISSN: 0003-682X; 1872-910X
• DOI: 10.1016/j.apacoust.2012.10.007

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.