Methods of Simulation of Railway Wheelset Dynamics taking into account Elasticity (original) (raw)
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Dynamic Model of a Railway Wheelset for Corrugation Problem Analysis
Noise & Vibration Worldwide, 2009
In the present work a model of flexible shafts is adapted for modelling the railway wheelset. The dynamic properties of the solid are obtained from a solid finite element model of a real wheelset. The model adopts an Eulerian coordinate set for numerical efficiency. Results of the crossed-receptance and mobility functions are presented, where the excitation is the vertical wheel-rail contact force and the displacement (or velocity) is measured in the wheel-rail contact plane. These results let us know that the gyroscopic effect may contribute to define the wavelength-fixing mechanism in some corrugation problems, even if the train speed is low.
Dynamics of a model of a railway wheelset
1994
In this paper we continue a numerical study of the dynamical behavior of a model of a suspended railway wheelset. We investigate the effect of speed and suspension and flange stiffnesses on the dynamics. Numerical bifurcation analysis is applied and one-and two-dimensional bifurcation diagrams are constructed. The onset of chaos as a function of speed, spring stiffness, and flange forces is investigated through the calculation of Lyapunov exponents with adiabatically varying parameters. The different transitions to chaos in the system are discussed and ana/yzed using symbolic dynamics, Finally, we discuss the change in orbit structure as stochastic perturbations are taken into account.
DS Journal of Modeling and Simulation, 2024
This paper presents a novel dynamic simulation of a multi-wheel system using Finite Element Analysis (FEA) in Abaqus, a finite element methods software, wherein the focus is on analyzing the rolling behavior of linked three-wheel configurations, subjected to vertical loading and a turning moment. The simulation captures the movement of the leading wheel when the moment is applied and its subsequent reverse rolling after the moment is removed. The unique observation high lights the importance of application of parking brakes for complete stability of the wheels of the rolling vehicles. The study demonstrates a practical approach to simulating dynamic wheel behavior and its potential for future work in multi-wheel system analysis.
Dynamic Analysis of Wheel/rail Interaction Using Finite Element Method
The dynamic interaction of wheel and rail is a key problem in a railway system. Vibration of the whole system is very noteworthy in terms of the service-life of the components, driving safety and passenger comfort. With the increasing speed of rail carriages it is a vital problem that should be analysed before designing of railway components including the bogies, wheel sets, rails, pads, sleepers and ballast. In this study, the dynamic interaction of the wheel and rail in a railway system has been studied. The dynamic model of the vehicle body, a freight bogie and the truck systems of UIC60 rail were modelled and analysed using an explicit method with a commercial FE software considering the real parameters of the vehicle and truck for a vehicle speed of 72 km/h. An artificial defect has been also formed on the head of the rail in order to compare the effects of the dynamic interaction of it with the smooth rail. Analyses results were given for the both cases and then the formation mechanism of corrugation was discussed in terms of short and long pitch wave vibration behaviour of the truck.
Railway wheelset bending flexibility
2010
This paper investigates the wheelset structural flexibility due to the bending vibration modes from a passenger coach. The axle is taken as a uniform Timoshenko beam. The wheels, break discs and the axle boxes are considered as rigid bodies with two degree of freedom, vertical displacement and angular motion. The equations of motion are solved for the steady state harmonic behavior via Green's function method. The natural frequencies of the symmetric modes are calculated. Starting from the flexibility at wheel versus frequency, the time-domain Green's function at wheel is obtained using the modal technique and the Fourier transform. This function is crucial to simulate wheel/rail interaction.
Designing of railway wheels. Part 1: finite element method
Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit, 2005
Current design processes can be simplified and accelerated if computer simulation based on finite element method (FEM) is used. FEM numerical calculations of different wheels of railway wheelsets are investigated in the Department of Railway Engineering. The justification for undertaking this issue is that there is no methodology in the design of railway wheelsets both in Poland and abroad; there is no possibility of optimizing wheelsets' construction characteristics depending on manufacturing process and service parameters. The analysis of this problem has made possible: (a) comparison of software used so far in strain calculation of railway wheelsets; (b) elaboration of design methodology for railway wheelsets; (c) increase in durability of railway wheelsets; (d) increase in the safety of rail transport; (e) decrease in manufacturing and service costs of railway wheelsets.
On the generalised model of a railway vehicle in vibrational motion with wheelset as an example
Mechanical Systems and Signal Processing, 1990
This paper presents a procedure for building mathematical models of a railway vehicle in vibrational motion along a track of arbitrary shape. The vehicle is considered on a straight track, on a circular curved one and on a transition curved one. Wheeiset has been chosen as an example in the paper but the method is general. Information is also given on other models of more complicated objects such as bogies and whole vehicles. These latter models have been built in the generalised-or quasi-coordinates. The presented generalised (i.e. valid for any track shape) models permit numerical simulation of any conditions of vehicle motion.
Simple flexible wheelset model for low-frequency instability simulations
Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit, 2014
As a general rule, multibody simulation models used by railway vehicle designers use totally rigid wheelsets, thus leading to possible errors when calculating the critical speed of the vehicle under study. This article suggests a wheelset model that takes into account wheelset flexibility for the study of dynamic stability. The model is simple to implement and easily parametrised, which can be applied to both conventional and variable gauge wheelsets. The parameters corresponding to wheelset flexibility that most influence critical speed of high speed and variable gauge vehicles are also analysed.
Modeling and simulation of a control system of wheels of wheelset
Archives of Transport, 2020
Modern light rail vehicles, such as a tram or rail bus, due to the need to provide mobility for the elderly or disabled people and the requirements of operators operating passenger rail transport or transport in urban areas must have a 100% low floor. Structurally, this is associated with the use of wheelset with independently rotating wheels (IRW) in such vehicles. It is also possible to use a bogie structure without the use of a wheelset axle by mounting the wheels directly in the side parts of the bogie frame. This construction is more complex and will not be discussed in this article. Bearing in mind the dynamic behavior of such vehicles during operation (lateral stability, profile wear) in various driving conditions (curve traffic, crossovers) and taking into account operating costs, it becomes necessary to install wheel rotation control systems to maintain center movement mass of the wheelset around the centerline of the track. The subject of the article will be considerations...
Analysis of wheel–rail interaction using FE software
Wear, 2005
In this article, research into the influence of interacting wheel and rail profiles on the distribution of contact zones and stresses is presented. The influence of contact forces on the deformation of rolling carload wheels and rails, and the influence of this deformation on the redistribution of the contact stresses is also investigated. The quasi-Hertz method as well as a finite element (FE) method were included as basis of mathematical simulation. With these tools, distributions of contact zones for different angles of attack of the wheelsets were defined. The problem was solved in three-dimensions. The offered technique to solve the contact problem has been used for the improvement of operating wheels.