Effect of Elasticity of Shafts, Bearings, Casing and Couplings on the Critical Rotational Speeds of a Gearbox

TL;DR

This study investigates how the elastic properties of shafts, bearings, casing, and couplings affect the critical rotational speeds of a gearbox with a helical gear pair, emphasizing the importance of comprehensive component modeling.

Contribution

It introduces a detailed finite element model that considers all key components' elasticity to accurately predict gearbox critical speeds.

Findings

Critical speeds are influenced by the combined elasticity of all gearbox components.

Resonant excitation modes with high potential energy are linked to maximum dynamic mesh forces.

Realistic predictions require modeling the elasticity of shafts, bearings, casing, and couplings together.

Abstract

The aim of this study is to analyse the influence of the mechanical characteristics of the set of components on the critical rotational speeds of a gearbox. The case of a gearbox fitted out with a helical gear pair was considered. The shafts and the casing were discretised using the finite element method. The elastic coupling between the toothed wheels was characterised by a 12 x12 stiffness matrix. The bearings were modelled using radial, axial and rotational stiffness elements. The calculation of the vibration response induced by the static transmission error showed that the highest dynamic mesh forces correspond to a resonant excitation of modes which have a high potential energy associated with the mesh stiffness. The numerical simulations performed showed that a realistic prediction of the critical rotational speeds should take account of all the components of the gearbox.