On the bending vibration of a train driving wheelset (original) (raw)
Related papers
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.
Romanian Journal of Transport Infrastructure, 2020
The driving wheelset is used in railway traction (locomotives, electric trains, trams, etc.) to support part of the weight of the suspended mass and to drive and brake the vehicle. The dynamics of the driving wheelset/track system is a very important issue in the railway engineering, and this paper is focused on basic features of the frequency response functions which describe the dynamic behavior in the presence of the rolling surfaces harmonic irregularities. To this end, a simple model of the driving wheelset/track system with the range of application limited up to 6-700 Hz is adopted. The driving wheelset model consists of a free-free uniform Euler-Bernoulli beam with three attached rigid bodies, representing the axle, the two wheels and the gear; the distinct feature of this model is the inertial asymmetry. Two independent infinite uniform Euler-Bernoulli beams, each on its foundation including two elastic layers for rail pad and ballast and an intermediate inertial layer for s...
Transport Problems
This paper presents an insight into mathematical analysis of dynamic models of the vehicle-track system. After identification of its advantages and disadvantages, an improved three-dimensional "vehicle-track" system of a mathematical model is presented. It not only assesses the influence of realistic track irregularities but also on all elements of the railway structure: rail, rail pads, sleepers, ballasts, and subballast parameters on the wagon's movement smoothness. Based on the expanded mathematical model of the "vehicle-track" dynamic system, the dynamic process of the wagon was theoretically studied, and the effect of track with irregularities on the vibrations of the wagon elements was studied. The final conclusions and recommendations are presented.
Procedia Manufacturing, 2020
In this paper, the harmonic response of the railway vehicle wheelset is investigated by using the finite element analysis method. The study relies on the vibrations of a Minden Deutz bogie of a passenger coach, having brake shoes and currently in operation on Romanian railway network. It is well known that by analysing the frequency response it can be identified how the parameters of the wheel-rail system is influencing the level of vibrations and the amount of rolling noise generated. Nonetheless, the approach of determining the harmonic response using the finite element analysis method is the only approach to studying the behaviour of the wheelset at frequencies greater than 1500 Hz.
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.
Influence of Bending Vibration on the Vertical Vibration Behaviour of Railway Vehicles Carbody
Applied Sciences
The topic of reducing structural vibrations in the case of flexible carbodies of railway vehicles has been intensively studied, but it is still an active research topic thanks to the importance of the perspective of improving the ride comfort. However, no study has been identified in the specialty literature to feature the contribution of the vibration structural modes upon the vibration behaviour of the railway vehicle carbody. The structural vibration modes of the flexible carbodies are particularly complex; however, the first vertical bending mode holds great significance in terms of the ride comfort. This paper analyses the influence of the first vertical bending mode on the vibration behaviour in three reference points of the railway vehicle carbody in correlation with the carbody flexibility, the vehicle velocity and the suspension damping. This study relies on comparisons between the results of the numerical simulations obtained for a ‘flexible carbody’ type model of the vehi...
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.
Methods of Simulation of Railway Wheelset Dynamics taking into account Elasticity
2017
Two simulation techniques for analyzing flexible wheelset dynamics are presented. They are applied within multibody approach and implemented in "Universal mechanism" software. Equations of wheelset motion are derived using floating frame of reference and component mode synthesis methods. Modal analysis is carried out in external FEA software. Kinematics of a wheel profile is described taking into account flexible displacements of wheelset nodes. In the first techniques, Lagrangian approach is applied to obtain all terms of equation of motion including inertia forces. In the second one, Eulerian approach is simulated in the stage of integration of equation of motion. Non-rotating finite element mesh of the wheelset is considered using the interpolation of flexible displacements in the nodes. The first simulation results obtained using both approaches are presented. These results confirm correctness of the suggested techniques.
Proceedings of the Institution of Mechanical Engineers, Part K: Journal of Multi-body Dynamics, 2020
In order to control the wheel–rail coupling vibration of an urban railway system, a combined elastic wheel damping structure is proposed where the key parameters that determine the structural damping and thereby control the vibration of the railway system are explored. The vertical acceleration of the elastic wheels is obtained for a range of stiffness coefficients as the wheel moves on an irregular track, which is calculated by the [Formula: see text] method in the time domain. The results show that the vertical acceleration changes with a V-shaped trend, with an increase of wheel stiffness coefficient, which allows the optimum stiffness coefficient for minimum vertical acceleration of the elastic wheel to be obtained. It is observed that when attempting to suppress wheel vibration, an elastic wheel with a larger stiffness coefficient is needed as the degree of track irregularity reduces. This paper provides new insights into the effect of wheel elasticity on vibration characterist...
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.