Analysis of thermo-physical properties on influence rules of vehicular twin-tube shock absorber

In order to investigate the influence rules of thermo-physical properties of the shock absorber on its temperature rising, the transmission model of heat transfer rate and physical heat-transfer model of a certain vehicular twin-tube hydraulic gas-charged shock absorber were built and the equations of heat conduction, heat convection, as well as radiation heat transfer were derived. Furthermore, its thermodynamic model was established by the first law of thermodynamics. The temperature and the work time when the shock absorber had reached the thermal equilibrium were calculated by iterative algorithm, and the correctness of modeling was verified by performing the rig test. The effects of thermo-physical properties on its temperature rising were analyzed, moreover the associated sensitivity analysis was carried out finally. The results showed that four kinds of thermo-physical properties of the shock absorber, i.e., oil density, oil thermal conductivity, oil specific heat and radiation emissivity of the cylinder wall affect its temperature rising characteristics, while the cylinder wall thermal conductivity does not influence the characteristic.