Rail irregularity is one of the most effective factors in train derailment. theste irregularities have generally random distribution that are assumed to be stationary random and ergodic processes in space, with Gaussian amplitude probabiliy densities and zero mean values. The quality of irregularities, their distribution along the rails and wagon speed are the main factors for train derailment ...

A generation method for the rail random irregularity with arbitrary wavelength interval (WI) is developed, and its accuracy and efficiency are demonstrated. Then a moving wheel-rail-bridge interaction element is derived to establish the finite element equations of motion for the train-rail-bridge interaction system, and the flow chart of assembly and calculation for the system equations is give...

the vibrations produced by trains include two parts which are deterministic and random vibrations. due to variation of dynamic loads and patterns of load-time, the random vibration of moving train is one of the most important issues in the field of railway engineering. one of the important sources in producing the train vibrations is rail roughness and irregularities. in this paper, responses o...

The vibrations produced by trains include two parts which are deterministic and random vibrations. Due to variation of dynamic loads and patterns of load-time, the random vibration of moving train is one of the most important issues in the field of railway engineering. One of the important sources in producing the train vibrations is rail roughness and irregularities. In this paper, responses o...

Background: In order to study the applicability of Low Vibration Track (LVT) in heavy-haul railway tunnels, this paper carried out research on dynamic effects LVT wheels and rails provided a technical reference for structural design track structures. Methods: Based system dynamics response sensitivity vehicle-track coupling dynamics, stability upper train, deformation tendency, under influence ...

While the track irregularity in turnout areas has a significant impact on wheel-rail contact, driving safety, and stability, of front incoming vehicles is often overlooked. This paper fills gaps study. As result, rigid-flexible coupled dynamic model vehicle developed. The effect various irregularities performance at high speeds been investigated based random sampling method. results show that d...

A hypergraph is k-irregular if there is no set of k vertices all of which have the same degree. We asymptotically determine the probability that a random uniform hypergraph is k-irregular.

Abstract A method for analysing the vehicle–bridge interaction system with enhanced objectivity is proposed in paper, which considers time-variant and random characteristics allows finding power spectral densities (PSDs) of responses directly from PSD track irregularity. The pseudo-excitation adopted framework, where vehicle modelled as a rigid body bridge using finite element method. vertical ...

Nonlinear vibration of parabolic springs employed in suspension system of a freight car has been studied in this paper. First, dynamical behavior of the springs is investigated by using finite element method and the obtained results are then used in vibration analysis of a railway freight car. For this purpose, dynamics of a parabolic spring subjected to a cyclic excitation has been studied ...