INFLUENCE OF SPATIAL VARIATIONS OF SEVERAL PARAMETERS OF RAIL ON SIMULATED WHEEL-TRACK DYNAMIC RESPONSE

Abstract

The variation of sleeper reaction force and wheel-rail contact force induced by the spatial variation of geometric dimensions, material parameters and surface profile of rails are simulated with the stochastic FEM (SFEM) and the stochastic collocation method. The spatial varitation of the dimensions or parameters is prescribed with Karhunen-Loeve expansion. The influence of the spatial variation of moment of inertia, area, Young’s modulus, density and surface pofile on the simulated force is investigated through numerical tests with a certain setting of wheel running speed. The simulated sleeper reaction and wheel-rail contact force for high running speed tend to have larger standard deviations than those for low running speed.