in this paper effects of fractured sleepers on rail track vibration under moving wheelset have been investigated. two parallel rails of the track have been modeled as euler-bernoulli beams on elastic points as rail pads. also sleepers have been modeled as visco-elastic euler-bernoulli beams. it is assumed that, some sleepers under the rail track have been fractured and modeled by two beams. the...

This article presents a numerical simulation that aims to examine the effect, of randomness in forward speed, in lateral clearance (dead band) and in both, on the dynamic behaviors of singleand two-axle railway wheelsets. Randomness is represented by pseudo-random numbers. They are incorporated into the dynamic models of the wheelsets. Subsequently, the temporal average of Lyapunov exponents is...

Railways are one of the most important means transportation, allowing people and goods to move quickly, environmentally beneficially, efficiently over long distances. To ensure safe reliable operations, regular condition-based assessments trains track paramount importance. Drive-by methodologies, which utilize data collected by onboard monitoring systems as vehicle travels track, have gained po...

Wheel profile is a very important factor that helps the steering performance of railway vehicle. However, during operation, wheel tends to vary inconsistently due frictional contact at wheel-rail interface. This paper focuses on problem wheelset and its alteration affects Signal-based indirect estimation technique using Fast Fourier Transform (FFT) proposed establish relationship between dynami...

The longitudinal flutter of the wheelset system has caused abnormal wear wheel-rail and stripping tread surface, resulting in complex dynamic problems locomotive. And asynchronous vibration could bring about different left right wheels when was some non-ideal working conditions. model considering effect bending moment is established to obtain equivalent force, which can carry out response simul...

Methods for multibody modelling and simulation should accurately replicate the dynamic behaviour of rail-wheel interface including precise values for wheel-rail contact positions. This paper studies the development of a novel 3-D wheel-rail contact model which is used for dynamic simulation of a suspended wheelset with parameters listed for a typical Mark IV coach. The contact point locations o...

In the article, using classical provisions of theoretical mechanics, various methods constructing a computational model rolling in wheel crest wheelset wagon from when moving stock along curved section track are presented.

The benefits of substituting the conventional solid wheelset by independently rotating wheels (IRW) in actively steered trailed railway vehicles have already been presented in many works. If a traction system is included in this kind of vehicle it will interact strongly with the active steering system. This paper investigates how traction and active steering systems can be combined in an IRW bo...

Wheel-rail systems can be modelled as mechanical multibody systems with holonomic constraints. The dynamical behaviour is described by a diierential-algebraic system of index 3 in non{Hessenberg form ((10]). We discuss the eecient numerical solution of these model equations. A perturbation analysis suggests the integration of the model equations in the Gear{Gupta{Leimkuhler (GGL) formulation. T...