The primary mechanisms playing a role in the dynamic wheel–rail response to rail weld irregularities in a ballasted track are pointed out. The concept of P1 and P2 forces for metallurgical rail welds, introduced in a first paper [1] concerning the present research, is further elaborated. The dynamic wheel–rail response is simulated for a number of geometrical rail weld measurements. Results sho...

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...

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 ...

It is known, that track deterioration (loss of its geometry) strongly depends on track support conditions, particularly on the ballast. In this paper a novel approach is presented to predict the evolution of track vertical irregularities due to vehicle-track dynamic interaction taking into account ballast stiffness with dry friction. An applied vehicle-track model is composed of a railway car a...

In the high-speed railway industry, pantograph-catenary system is responsible to provide continuous electric energy for train. The suffers multiple impacts from complex work environment. vehicle-track excitation one of normal disturbances interaction. Previous studies only consider vertical effect vibration on To address this deficiency, both and models are constructed in paper. validations ver...

The principal causes of cracking in prestressed concrete sleepers are the dynamic loads induced by track irregularities and imperfections in the wheel-rail contact and the in-phase and out-of-phase track resonances. The most affected points are the mid-span and rail-seat sections of the sleepers. Central and rail-seat crack detection require visual inspections, as legislation establishes, and i...

In this paper, we derive analytical expressions describing spectral and mutual densities of random processes by performing Fourier transform the corresponding correlation functions. On basis accepted for functions differentiable processes, density components, which is a complex frequency function, are derived. The influence on functions, densities, components (real, imaginary, amplitude, phase)...