Gearbox Noise——Correlation with Transmission Error and Influence of Bearing Preload变速箱噪声——相关的传输错误和轴承预压的影响摘要ABSTRACTThe five appended papers all deal with gearbox noise and vibration. The first paper presents areview of previously published literature on gearbox noise and vibration.The second paper describes a test rig that was specially designed and built for noise testing ofgears. Finite element analysis was used to predict the dynamic properties of the test rig, andexperimental modal analysis of the gearbox housing was used to verify the theoretical predictionsof natural frequencies.In the third paper, theinfluence of gear finishing method and gear deviations on gearbox noiseisinvestigated in what is primarily an experimental study. Eleven test gear pairs weremanufacturedusing three different finishing methods. Transmission error, which is considered to bean important excitation mechanism for gear noise, was measured as well as predicted. The testrig was used to measure gearbox noise and vibration for the different test gear pairs. Themeasured noise and vibration levels were compared with the predicted and measured transmissionerror. Most of the experimental results can be interpreted in terms of measured and predictedtransmission error. However, itdoes not seem possible to identify one single parameter,such as measuredpeak-to-peak transmission error, that can be directly related to measurednoise and vibration. The measurements also show that disassembly and reassembly of thegearbox with the same gear pair can change the levels of measured noise andvibration considerably.This finding indicates that other factors besides the gears affect gear noise.In the fourth paper, the influence of bearing endpl...
