Development of a method for numerical analysis of contact stresses in roller bearings

Aeronautical and Space-Rocket Engineering


DOI: 10.34759/vst-2022-3-180-190

Аuthors

Semenova A. S.*, Kuz’min M. V.**

Lyulka Experimental Design Bureau, branch of the United Engine Corporation – Ufa Engine Industrial Association, 13, Kasatkina str., Moscow, 129301, Russia

*e-mail: anna.semenova.lulka@gmail.com
**e-mail: maxim.kuzmin@okb.umpo.ru

Abstract

The article deals with studying the effect of the inter-rotor bearing numerical model characteristics such as:

– characteristic size of elements, determining the computations step;

– numerical formulation of finite elements;

– integration method (explicit or implicit) on the computations time and accuracy.

Reliability of both machines and mechanisms is known to be largely dependent on the bearing assembly operability. This is of special importance for the aircraft engineering products, since bearing assemblies of aviation engines, reducing gear, units and products of aircraft are one of the utmost crucial assemblages, which determine as a rule their resources. The inter-rotor bearing is one of the most problematic assemblages of the engine. The engine is being taken off the operation while the inter-rotor bearing defect symptoms diagnostics since in may lead the rotors jamming and failure of the whole engine. The main cause of bearings failure under normal conditions is an emergence of contact stresses, and consequently rolling surface degradation.

Most known analytical methods for computing the contact crumpling stresses in bearings are based on the Hertz theory on the static contact of the two bodies. However, there is a number of simplifications for this theory:

– nonexistence of friction;

– the contact area is small as against to the curvature radius;

– materials of contacting bodies are homogenous, isotropic and perfectly elastic.

Numerical computation allows solving contact problems without simplification of the Hertz theory:

– friction simulation;

– accounting for the material nonlinear properties;

– accounting for the contacting surfaces roughness by the finite-element mesh size selection.

The authors performed comparative assessment of the stresses in the rollers contact with bearing roller ways with the opposite and unidirectional rotation of rings with account for the above-listed factors.

The effect of the inter-rotor bearing rings misalignment on the contact stresses of crumbling was studied in this work as well.

The factors assessment was performed in the LS-DYNA software.

The presented work was accomplished for the dynamic model preparation, where the bearing rings rotation is accounted for.

Keywords:

inter-rotor bearing, surface roughness, contact area, contact stresses

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