| Summary: | Train circulation is a random dynamic phenomenon and, according to the different frequencies of the loads it imposes, there exists the corresponding response of track superstructure. Random dynamic phenomena are generally approached through the probability of occurrence (for stochastic processes see [1]). The railway track is modeled as a continuous beam on elastic support. At the moment when an axle of a railway vehicle passes from the location of a support point of a rail, that is a sleeper, a random dynamic load is applied on the sleeper. The theoretical approach for the estimation of the dynamic loading of a sleeper demands the analysis of the total load acting on the sleeper to individual component loads-actions, which, in general, can be divided into: the static component of the load‚ and the relevant to it reaction/action per support point of the rail (sleeper), the semi-static component of the load, and the relevant to it reaction/action per support point of the rail (sleeper) and the dynamic component of the load, and the relevant to it reaction/action per support point of the rail (sleeper). The motion of a railway vehicle on the rail running table –of the railway track– is described by formulas and it is illustrated through diagrams which have the form of a “signal”. It is a random/ stochastic dynamic phenomenon. The general equation that describes the motion is the second order differential equation (of motion). In the present paper the dynamic component of the Load and the relevant Action/ Reaction on each support point of the rail are investigated through a sensitivity analysis by variating parameters of the second order differential equation of motion of the Non Suspended Masses of the Vehicle ([2],[3]) and specifically the transient response of the reaction/ action on each support point (sleeper) of the rail. © 2014, North Atlantic University Union. All rights reserved.
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