Authors: Barthod, Muriel; Hayne, Bénédicte; Tebec, Jean-Louis

Source: Acta Acustica united with Acustica, Volume 91, Number 1, January/February 2005 , pp. 180-191(12)

Publisher: S. Hirzel Verlag

Abstract:

Sound design is currently being developed in various fields. The automotive industry is a pioneer in acoustic comfort and the concept has become a marketing issue. However since the main noise sources in a vehicle have been progressively reduced, secondary sources of noise have emerged, such as neutral gear rattle noise caused by gear teeth shocks inside the gearbox due to the effect of excitation by engine torque fluctuation (and hence engine rotational speed and acceleration irregularity). This mechanical behavior, which does not affect the functioning of the engine and is not a cause of wear, becomes a problem only when it is noticeable. In this article, two complementary aspects of how idle rattle noise is perceived will be presented. An overall study of noise, based on subjective evaluation tests has highlighted the most significant physical parameters as far as this noise perception is concerned. Bench tests were conducted reproducing the phenomenon of rattle with perfectly adjusted angular acceleration at the gearbox input shaft. These tests made it possible to observe the influence of various excitation parameters on noise. Different rattle rhythms were obtained and the influence of both the spectral composition and the temporal shape of the engine torque fluctuation at the gearbox input shaft were shown.

Document Type: Research article

Publication date: 2005-01-01

More about this publication?

• 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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