Car gearboxes can sometimes reveal noise problems. Especially, rattle noise is a disturbance of concern nowadays. This acoustical nuisance appears in the form of clanking noises and shocks that can be heard in the car cabin and that are generated in particular by synchronizer rings and loose gears in the gearbox housing. Those metallic shocks are due to a bad isolation of the engine cyclic irregularities that are directly transmitted to the gearbox. They are responsible for broadband excitations directly applied on the casing. Rattle noise issues from this process. In this paper, the acoustical properties of gearboxes were investigated. We have carried out vibration and airborne sound transmission characteristic measurements under acoustic and mechanical excitations in order to characterize the empty casing behaviour. Finally, an equivalent model of the structure was derived which might help us assess the radiation trends of such casings.
Acoustic radiation of car gearbox casings
Akustische Ausstrahlung von Fahrzeuggetriebegehäusen
1994
10 Seiten, 10 Bilder, 3 Quellen
Conference paper
English
Acoustic radiation of car gearbox casings
Automotive engineering | 1994
|Acoustic radiation of car gearbox casings
British Library Conference Proceedings | 1994
|Online Contents | 1993