Abstract
Gears of circular-arc tooth profile have been recently introduced to industry and proved to be of higher load-carrying capacity than the corresponding involute gears. Conflicting reports discussed the noise of such gears as compared with involute helical gears. This paper presents the results of an experimental investigation of the noise of this type of gear when running in a power circulating rig inside an anechoic room. More than 4400 magnetic tape recordings were taken and analysed in third-octave bands, for gears of different parameters running at different speeds and transmitting different loads. The origin of noise and its propagation have been studied on a three-dimensional presentation of noise around the surface of a measuring acoustic sphere. The results revealed that the noise of this type of gear is generally higher than that of involute helical gears but its distribution is more uniform. Some recommendations for quieter gear running have been given to gear designers.
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