Prediction of Gear-Mesh-Induced High-Frequency Vibration Spectra in Geared Power Trains.

摘要

Characteristics of vibration spectra induced by gear meshes in both single gear reductions and planetary gear reductions were investigated. Methods were developed to analyze the planet-pass induced vibrations which exist in normal planetary gear reduction systems. It was found that the planet-pass vibration sideband frequencies occur both below and above the base signal at integer multiples of planet-pass frequency and that the sideband amplitudes may exceed that of the base signal. The effect of planet pair phasing on the vibration sideband spectra was determined for the CH-47helicopter forward rotor drive transmission first-stage planetary reduction. A computer-implemented analysis was established for predicting vibration sidebands produced by variations in centerline distance,tooth transmitted force,and tooth support discontinuities for single gear mesh systems. (Modified author abstract)