ABSTRACT
The railway track and its substructure are idealized by an infinitely long beam subjected to a moving lumped mass. Dynamic behaviour of railway track subjected to moving vehicles is affected by random deviations of its parameters from their nominal values. The most important factor of stochastic character is the rigidity of the substructure which is correlated with the random track irregularities. The first approximation of the load which is moving along the longitudinal axis of a beam (rail) may be represented by a lumped mass or by a system whose transfer functions are known. The deflection of rails is charged by greater dispersion than their stresses. The track imperfections wear out the rail vehicles more than the rails. The overall dynamic and fatigue effects of vehicles on track with imperfections are greater than for ideal case without inspections. The chapter presents a theoretical analysis and shows that it needs a numerical evaluation of several special cases and an experimental verification in future.
