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Inequidistant gearing used to reduce gear noise

: Neubauer, Philipp; Bös, Joachim; Melz, Tobias

Deutsche Gesellschaft für Akustik -DEGA-, Berlin:
45th International Congress and Exposition on Noise Control Engineering, Inter-Noise 2016 : Towards a quieter future; August 21 - 24, 2016, Hamburg
Hamburg, 2016
ISBN: 978-3-939296-11-9
International Congress and Exposition on Noise Control Engineering (Inter-Noise) <45, 2016, Hamburg>
Fraunhofer LBF ()
gear noise; annoyance; psychoacoustic

Tonal noise is considered annoying. Unlike broadband noise, tonal noise is hard for the human brain to ignore. State-of-the-art gears primarily radiate this annoying tonal noise, which is caused by the regularly positioned teeth along the pitch circle of the gearwheel. In this paper, the inequidistant gearing will be presented. The principle of the regularly positioned (equidistant) teeth will be transgressed. When the positions of the teeth are variable, the gears generate less tonal noise. Therefore, their noise is less annoying. Thus, the radiated sound pressure level and the psychoacoustic loudness can be reduced. A theoretical investigation of the emergence of the gear noise of inequidistant gears will be shown, followed by the design of a set of spur gears with inequidistant gearing. The benefits and challenges of this new design will be discussed. A comparison of the experimental results from the gears with inequidistant and equidistant gearing will be presented and discussed. From this, a reduction of the sound pressure level, the psychoacoustic loudness, and the psychoacoustic annoyance can be achieved.