A Study of Gear Noise and Vibration
2002 (English)Report (Other academic)
The influence of gear finishing method and gear deviations on gearbox noise is investigated in this mainly experimental study. Eleven different test gear pairs were manufactured using three different finishing methods as well as different gear tooth modifications and deviations. The surface finish and geometry of the gear tooth flanks were measured. Transmission error, which is considered to be an important excitation mechanism for gear noise, was predicted and measured. LDP software from Ohio State University was used for the transmission error computations. A specially built test rig was used to measure gearbox noise and vibration for the different test gear pairs. The measurements show that disassembly and reassembly of the gearbox with the same gear pair can change the levels of measured noise and vibration considerably. The rebuild variations are sometimes in the same order of magnitude as the differences between different tested gear pairs, indicating that other factors besides the gears affect gear noise.
Most of the experimental results can be understood and explained in terms of measured and predicted transmission error. However, it does not seem possible to find one single parameter, such as measured peak to peak transmission error, that can be related directly to measured noise and vibration.
Shaved gears do not seem to be noisier than ground gears even if their gear tooth deviations are larger. Factors that do seem to reduce gear noise, when compared with profile ground reference gears, are threaded wheel grinding, increased face-width, decreased lead crowning, increased pitch errors and decreased lead twist. Factors that seem to increase noise are a rougher surface finish, increased lead crowning and helix angle error.
Place, publisher, year, edition, pages
2002. , 44 p.
Trita-MMK, ISSN 1400-1179 ; 2002:8
gear, gearbox, noise, vibration, transmission error
IdentifiersURN: urn:nbn:se:kth:diva-9893OAI: oai:DiVA.org:kth-9893DiVA: diva2:139881
QC 201009232009-01-272009-01-272010-09-23Bibliographically approved