A Survey of Railway Vehicle Dynamics Research

1974 ◽  
Vol 96 (2) ◽  
pp. 132-146 ◽  
Author(s):  
E. H. Law ◽  
N. K. Cooperrider
Keyword(s):  
Experimental Research ◽  
Vehicle Dynamics ◽  
Vehicle Suspension ◽  
Railway Vehicle ◽  
Railway Vehicles ◽  
Conflicting Objectives ◽  
Analytical Research

This paper presents a survey of the research concerned with the dynamics of single, conventional railway vehicles. Attention is concentrated on analytical research and only that experimental research that has been performed in conjunction with analytical efforts. The often conflicting objectives for railway vehicle suspension design and the research done to understand the design implications of these objectives are discussed.

Analytical formulae for the design of a railway vehicle suspension system

2001 ◽  
Vol 215 (6) ◽  
pp. 683-698 ◽  
Author(s):  
G R M Mastinu ◽  
M Gobbi ◽  
G D Pace
Keyword(s):  
Standard Deviation ◽  
Dynamic Response ◽  
Optimization Method ◽  
Degree Of Approximation ◽  
The Body ◽  
Vehicle Suspension ◽  
Railway Vehicle ◽  
Body Acceleration ◽  
Railway Vehicles ◽  
Analytical Formulae

A simple two-degree-of-freedom (2DOF) model is used to derive a number of analytical formulae describing the dynamic response of railway vehicles to random excitations generated by vertical track irregularities. The dynamic response is given in terms of standard deviations of a number of relevant performance indices such as body-bogie suspension stroke and body acceleration. The derived analytical formulae can be used either during preliminary design or for other special purposes, especially when approximated results are acceptable. An estimation of the degree of approximation offered by analytical formulae is attempted and the results seem satisfactory. By inspection of the analytical formulae a parameter sensitivity analysis may be readily performed. In the second part of the paper, an optimization method for the improvement of the dynamic behaviour of railway vehicles is introduced. The method, based on multiobjective programming (MOP), is a general one and can be exploited for many engineering purposes. In the paper the method has been applied with the aim of achieving the desired trade-off among conflicting performances such as standard deviation of the body acceleration versus standard deviation of the secondary suspension stroke. As a result, new analytical formulae defining the settings of some relevant vehicle suspension parameters have been derived.

Semi-Active Suspension Systems for Railway Vehicles Based on Magnetorheological Fluid Dampers

2007 ◽  
Author(s):  
D. H. Wang ◽  
W. H. Liao
Keyword(s):  
Suspension System ◽  
Full Scale ◽  
Vehicle Suspension ◽  
Railway Vehicle ◽  
Mr Fluid ◽  
Railway Vehicles ◽  
Suspension Systems ◽  
Secondary Suspension ◽  
Fluid Dampers ◽  
Track Irregularities

In this paper, a seventeen degree-of-freedom (DOF) model for a full scale railway vehicle integrated with the semi-active controlled magnetorheological (MR) fluid dampers in its secondary suspension system is proposed to cope with the lateral, yaw, and roll motions of the car body, trucks, and wheelsets. The governing equation considering the dynamics of the railway vehicle integrated with MR fluid dampers in the secondary suspension system and the dynamics of the rail track irregularities are developed. The Linear Quadratic Gaussion (LQG) control law using the acceleration feedback is adopted, in which the state variables are estimated from the measurable accelerations with a Kalman estimator. In order to evaluate how the performances of the railway vehicle system integrated with the semi-active controlled MR fluid dampers can be improved, the lateral, yaw, and roll accelerations of the car body, trucks, and wheelsets of a full scale railway vehicle integrated with MR fluid dampers, which are controlled (the semi-active) and uncontrolled (the passive on and passive off) respectively, are analyzed under the random track irregularities based on the established governing equations and the modelled track irregularities. The simulation results not only show the control effectiveness of the railway vehicle with the semi-active suspension system based on MR fluid dampers for railway vehicles, but also illustrate that the semi-active railway vehicle suspension system based on MR fluid dampers combines the merits of the passive on and passive off railway vehicle suspension systems.

scholarly journals Identification of the Major Noise Energy Sources in Rail Vehicles Moving at a Speed of 200 km/h

Energies ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3957
Author(s):  
Krzysztof Polak ◽  
Jarosław Korzeb
Keyword(s):  
Experimental Research ◽  
Energy Sources ◽  
Dominant Source ◽  
Railway Vehicles ◽  
Measurement Apparatus ◽  
Rail Vehicles ◽  
Noise Energy ◽  
Rolling Noise ◽  
Multiple Units

In this work, the problematic identification of the main sources of noise occurring from the exploitation of railway vehicles moving at a speed of 200 km/h were analyzed. Within the conducted experimental research, the testing fields were appointed, measurement apparatus selected, and a methodology for conducting measurements was defined, including the assessment of noise on a curve and straight track for electric multiple units of the so-called Pendolino, an Alstom type ETR610 series ED25 train. The measurements were made using a microphone camera Bionic S-112 at a distance of 22 m from the track axis. As a result of the conducted experimental research, it was indicated that the noise resulting from vibrations arising at the wheel-rail contact (rolling noise) was the dominant source of sound.

scholarly journals Simulation of Energy Absorption Performance of the Couplers in Urban Railway Vehicles during a Heavy Collision

Machines ◽  
2021 ◽  
Vol 9 (5) ◽  
pp. 91
Author(s):  
Sunghyun Lim ◽  
Yong-hyeon Ji ◽  
Yeong-il Park
Keyword(s):  
Reaction Force ◽  
Crash Test ◽  
Railway Vehicle ◽  
Buffer System ◽  
Railway Vehicles ◽  
Hydraulic Shock Absorber ◽  
Coupling Buffer ◽  
Absorption Performance ◽  
Different Characteristics ◽  
The Impact

Railway vehicles are generally operated by connecting several vehicles in a row. Mechanisms connecting railway vehicles must also absorb front and rear shock loads that occur during a train’s operation. To minimize damage, rail car couplers are equipped with a buffer system that absorbs the impact of energy. It is difficult to perform a crash test and evaluate performance by applying a buffer to an actual railway vehicle. In this study, a simulation technique using a mathematical buffer model was introduced to overcome these difficulties. For this, a model of each element of the buffer was built based on the experimental data for each element of the coupling buffer system and a collision simulation program was developed. The buffering characteristics of a 10-car train colliding at 25 km/h were analyzed using a developed simulator. The results of the heavy collision simulation showed that the rubber buffer was directly connected to the hydraulic shock absorber in a solid contact state, and displacement of the hydraulic buffer hardly occurred despite the increase in reaction force due to the high impact speed. Since the impact force is concentrated on the vehicle to which the collision is applied, it may be appropriate to apply a deformation tube with different characteristics depending on the vehicle location.

Control and monitoring for railway vehicle dynamics

2007 ◽  
Vol 45 (7-8) ◽  
pp. 743-779 ◽  
Author(s):  
Stefano Bruni ◽  
Roger Goodall ◽  
T. X. Mei ◽  
Hitoshi Tsunashima
Keyword(s):  
Vehicle Dynamics ◽  
Railway Vehicle

Railway vehicle dynamics

1986 ◽  
Vol 17 (4) ◽  
pp. 181-186 ◽  
Author(s):  
B V Brickle
Keyword(s):  
Vehicle Dynamics ◽  
Railway Vehicle

scholarly journals Application and Comparison of Uncertainty Quantification Methods for Railway Vehicle Dynamics with Random Mechanical Parameters

Mechanika ◽  
2019 ◽  
Vol 25 (6) ◽  
pp. 455-462
Author(s):  
Dawei Zhang ◽  
Peijuan Xu ◽  
Daniele Bigoni
Keyword(s):  
Uncertainty Quantification ◽  
Vehicle Dynamics ◽  
Deterministic Model ◽  
Coupled Model ◽  
Latin Hypercube Sampling ◽  
Collocation Methods ◽  
Impact Behavior ◽  
Railway Vehicle ◽  
Parametric Uncertainties ◽  
The Impact

This paper aims to investigate uncertainties in railway vehicle suspension components and the implement of uncertainty quantification methods in railway vehicle dynamics. The sampling-based method represented by Latin Hypercube Sampling (LHS) and generalized polynomial chaos approaches including the stochastic Galerkin and Collocation methods (SGM and SCM) are employed to analyze the propagation of uncertainties from the parameters input in a vehicle-track mathematical model to the results of running dynamics. In order to illustrate the performance qualities of SGM, SCM and LHS, a stochastic wheel model with uncertainties of the stiffness and damping is firstly formulated to study the vertical displacement of wheel. Numerical results show that SCM, which can be easily implemented by means of the existing deterministic model, has explicit advantages over SGM and LHS in terms of the efficiency and accuracy. Furthermore, a simplified stochastic bogie model with three random suspension parameters is also established by means of SCM and LHS to analyze the critical speed, which is affected obviously by the parametric uncertainties. Finally, a stochastic vertical vehicle-track coupled model with parametric uncertainties is built comprehensively on the basis of SCM, by which the impact behavior of wheel-rail interaction under a rail defect is investigated and the dynamic response of vehicles under the track irregularity is explored in terms of the Sperling index. It concludes that the uncertainties of parameters have a significant influence on P2 force and Sperling index from the view of the running quality.

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