Analysis of temperature effect on damping characteristics of landing gear shock absorber

The working environment temperature of the landing gear shock absorber is affected by the fuselage and the airport temperature, and temperature change will affect the performance of hydraulic oil, thus affecting the damping characteristics of the shock absorber. In this paper, the thin-walled orifice is selected as the test object. Firstly, the shock absorber under different temperatures is tested with the help of the Fluid-Damping-Test-Platform. At each temperature, the shock absorber is loaded at low speed and constant speed respectively, and the variation law of oil damping force with displacement is obtained. Then, based on the dynamic mesh technology, CFD simulation of the flow field in the test shock absorber is carried out to simulate the test process and verify the reliability of the test results. Finally, the conclusion is drawn: the decrease of temperature will lead to the increase of oil viscosity, which will lead to the decrease of Reynolds number, which will lead to the decrease of discharge coefficient, and finally lead to the increase of oil damping force.