Finite Element Analysis to Predict Performance of Flexure Bearing for Space Application

Abstract

Finite Element Analysis of a flexure bearing used in a cryocooler for space application is a very critical component in determining the working life of cryocoolers. The present study analyzes various significant parameters using the finite element analysis to achieve finite-fatigue life. The infinite fatigue life is necessary to ensure that cryocooler does not fail during the mission life of the satellite. Flexure bearing serves two purposes—(a) maintaining a mean position of a free-piston in linear compressor by providing desired stiffness and (b) avoiding radial deflection of the piston leading to wear and tear. The flexure bearing also ensures oil-less operation of linear compressor since the use of oil in cryocooler may lead to severe damage to the heat exchanger by freezing at cryogenic temperature. This paper considers various essential parameters optimized to achieve—(a) high stiffness (b) load stresses and (c) infinite fatigue life necessary for space application.