Prediction of Mesh-Generated Gear System Vibrations.

This report analyzes the origination and transmission of vibrations from a single pinion-gear mesh to a typical gear structure. The mesh-generated vibrations are computed using the analytical approach of Mark, which has been formulated to consider each tooth separately, as well as mesh-averaged effects. A gear tooth axial load distribution model is developed based on pinion twist as the principal cause of nonuniformity for use in Marks analysis. Vibration transmission from the mesh through the gear internals is modelled by a six degree of freedom lumped-mass analysis, while th casing dynamics are determined from an empirical model of similar gearboxes. It is concluded that this procedure can predict mesh-generated vibration levels of typical Navy locked-train double-reduction gears to a first order accuracy and is capable of further refinement. Keywords Gear noise Gear vibration Mesh tones Gear system vibrations Sidebands Fourier analysis of gear vibrations Effect of K factor on gear noise.