Analysis of high speed rotating flexible wheelset-flexible track coupled dynamics

2016 ◽  
pp. 1085-1094
Keyword(s):  
High Speed ◽  
Coupled Dynamics ◽  
Flexible Wheelset ◽  
Flexible Track

Motor car–track spatial coupled dynamics model of a high-speed train with traction transmission systems

2019 ◽  
Vol 137 ◽  
pp. 386-403 ◽  
Author(s):  
Zhiwei Wang ◽  
Guiming Mei ◽  
Qing Xiong ◽  
Zhonghui Yin ◽  
Weihua Zhang
Keyword(s):  
High Speed ◽  
High Speed Train ◽  
Dynamics Model ◽  
Transmission Systems ◽  
Coupled Dynamics

scholarly journals Track Allocation Optimization in Multi-Direction High-Speed Railway Stations

Symmetry ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 459 ◽  
Author(s):  
Qin Zhang ◽  
Xiaoning Zhu ◽  
Li Wang
Keyword(s):  
High Speed ◽  
Occupation Time ◽  
Rolling Stock ◽  
High Speed Rail ◽  
High Speed Railway ◽  
Railway Stations ◽  
Proposed Model ◽  
Flexible Track ◽  
Integer Linear Model ◽  
Commercial Solver

Track allocation optimization in railway stations is one of the most fundamental problems for scheduling trains, especially in multi-direction high-speed railway stations. With the construction of high-speed rail networks, this kind of station has become increasingly common. However, the track allocation depends not only on the station tracks, train timetable, and rolling stock plan, but also on the resources in the station throat area. As a result, an effective track allocation plan becomes significant but also difficult. In this paper, we consider all these factors to make the results more practicable and an integer linear model that minimizes the total occupation time of resources in the throat area is presented. A flexible track utilization rule is also adopted to this model to fit the characteristics of the multi-direction station. Meanwhile, a detailed explanation of resources’ occupation time is illustrated to facilitate the representation of the conflicting constraints. To resolve these issues, we use a commercial solver with its default parameters. A computational experiment of a station is conducted to verify the effectiveness of the proposed model. The resources utilization plan indicates that the capacity of a station is limited by the throat area, rather than by the station tracks.

Influence of a flexible wheelset on the dynamic responses of a high-speed railway car due to a wheel flat

2017 ◽  
Vol 232 (4) ◽  
pp. 1033-1048 ◽  
Author(s):  
Xingwen Wu ◽  
Subhash Rakheja ◽  
AKW Ahmed ◽  
Maoru Chi
Keyword(s):  
Dynamic Response ◽  
Dynamic Model ◽  
High Speed ◽  
Dynamic Responses ◽  
Vertical Acceleration ◽  
High Speed Train ◽  
Multibody Dynamic ◽  
Flexible Track ◽  
Wheel Flat ◽  
Track Slab

Large magnitude impact loads caused by wheel flats may excite various vibration modes of wheelsets employed in high-speed trains and thereby contribute considerably to the dynamic response of vehicles. In this study, the wheelset is modeled as a flexible body using the modal approach, which is integrated to a multibody dynamic model of the high-speed train coupled with a flexible track slab model. The multibody dynamic model is formulated for a typical high-speed train consisting of a car body, two bogie frames, and four wheelsets. The track is modeled considering the rail as a Timoshenko beam discretely supported on a flexible track slab. The effects of the wheelset flexibility on the dynamic response are illustrated through comparisons with those obtained with a rigid wheelset considering different vehicle speeds and sizes of the wheel flat. Subsequently, the effects of wheel flats on the vehicle–track system are evaluated in terms of the wheel–rail impact forces, axle-box vertical acceleration, and dynamic stress developed in the wheelset due to a haversine wheel flat. The results suggest that the wheelset flexibility can lead to significantly higher axle-box vibration and wheelset axle stress compared to a rigid wheelset in the presence of a wheel flat.

Dynamic response analysis of the brake disc of a high-speed train with wheel flats

2021 ◽  
pp. 095440972110317
Author(s):  
Zhiwei Wang ◽  
Jiliang Mo ◽  
Micheale Yihdego Gebreyohanes ◽  
Kaiyun Wang ◽  
Junyong Wang ◽  
...  
Keyword(s):  
Stress State ◽  
High Speed ◽  
Dynamic Properties ◽  
High Stress ◽  
Rigid Bodies ◽  
Response Analysis ◽  
Brake Disc ◽  
Dynamics Model ◽  
Coupled Dynamics ◽  
Brake Discs

To study the vibration characteristics and stress state of brake discs during vehicle operations, a spatial trailer car-track coupled dynamics model was developed with the consideration of flexible brake disc. In the model, the components of a trailer car are considered as rigid bodies. Flexible models of the brake disc and wheelset were established using the finite element method. The trailer car-track coupled dynamics model is validated using experimental test results. The effects of wheelset flexible deformation on the dynamic properties of brake discs were investigated with the excitations of track irregularity and wheel flats. Furthermore, the brake disc was systematically evaluated and discussed under the condition of wheel flats in the coupled dynamics system. The results indicate that compared to rigid wheelsets with wheel flats, flexible wheelsets can cause the brake disc to vibrate more severely with higher stress. The severe vibration and high stress state of the brake disc could cause it to crack in the region near the bolts. The established dynamics model can be further developed and employed to assess the dynamics of the brake systems of high-speed trains.

The dynamic resonance under multiple flexible wheelset-rail interactions and its influence on rail corrugation for high-speed railway

2021 ◽  
Vol 498 ◽  
pp. 115968
Author(s):  
Chaozhi Ma ◽  
Liang Gao ◽  
Tao Xin ◽  
Xiaopei Cai ◽  
Mahantesh M Nadakatti ◽  
...  
Keyword(s):  
High Speed ◽  
High Speed Railway ◽  
Rail Corrugation ◽  
Flexible Wheelset ◽  
Dynamic Resonance

scholarly journals Effect of wheel polygonalization on the Degree of Non-linearity of dynamic response of high-speed vehicle system

2021 ◽  
pp. 002029402110354
Author(s):  
Chen Shuangxi ◽  
Ni Yanting
Keyword(s):  
Dynamic Response ◽  
Health Monitoring ◽  
Extraction Method ◽  
High Speed ◽  
Vibration Response ◽  
High Speed Train ◽  
Coupled Dynamics ◽  
Vehicle System ◽  
Parameters Extraction ◽  
Non Linear

Polygonalization of the wheel describes the growth of out-of-round profiles of the wheels of railway vehicle. This problem was identified in the 1980s but its mechanism is still not well understood. The wheel-rail disturbance formed by wheel polygonalization will accelerate the fatigue fracture of the key parts of rail vehicles and seriously threaten the safety of rail vehicle. This fact has led to significant efforts in detecting and diagnosing wheel polygonalization, in particular in setting the criteria for health monitoring. Currently, the time-domain feature parameters extraction method based on data statistics and frequency-domain feature parameters extraction method based on spectrum estimation are widely applied to detect wheel polygonalization. However, the basis of spectral estimation is the Fourier transform, which is not good at dealing with non-linear vibration systems (such as vehicle-track coupled system). Aiming at the wheel polygonalization problem existing in high-speed train, the non-linear extent of vibration response of vehicle system caused by wheel polygonalization is analyzed based on vehicle-track coupled dynamics and adaptive data analysis method. A typical high-speed train model is established according to the vehicle-track coupled dynamics theory. The wheel polygonalization model is introduced and vehicle system vibration response is calculated by numerical integration. The vibration response signal is decomposed by empirical mode decomposition (EMD) to produce the intrinsic mode functions (IMFs). By calculating the intra-wave frequency modulation of IMFs, that is, the difference between instantaneous and mean frequencies and amplitudes, the non-linearity of the dynamic response is quantified. Influences of wheel polygonalization on the non-linearity of steady-state and unsteady vibration responses of vehicle system are analyzed in detail. An objective criterion for wheel polygonalization health monitoring based on Degree of Non-linearity is proposed, which provides an effective tool for prognostics and health management of trains.

A ROBUST QFT-EIGENSTRUCTURE ASSIGNMENT CONTROL METHOD FOR THE COUPLED DYNAMICS IN HIGH-SPEED CRAFTS

2007 ◽  
Vol 40 (17) ◽  
pp. 141-146
Author(s):  
R. Muñoz-Mansilla ◽  
J. Aranda ◽  
J.M. Díaz ◽  
S. Dormido-Canto ◽  
D. Chaos
Keyword(s):  
High Speed ◽  
Control Method ◽  
Eigenstructure Assignment ◽  
Coupled Dynamics

Stability of a Flexible Wheelset for High Speed Rail Vehicles With Constant and Varying Parameters

1998 ◽  
Vol 120 (4) ◽  
pp. 997-1002 ◽  
Author(s):  
J. Lieh ◽  
J. Yin
Keyword(s):  
High Speed ◽  
State Transition ◽  
Time Varying ◽  
Vehicle Dynamic ◽  
High Speed Rail ◽  
Rail Vehicles ◽  
Flexible Wheelset ◽  
The Stability ◽  
Time Varying Models ◽  
Stability Concept

The stability of an elastic wheelset coupled with torsional spring and damper is studied in this paper. With flexible elements between two wheels, the advantages of both rigid and independently rotating wheel systems may be obtained. Previous investigations indicated that axle flexibility will affect the vehicle dynamic behavior and an optimal design may improve the system performance. Those studies were limited to constant wheel/rail geometry as the wheelset rolls along the track. In this paper, it is intended to determine the critical speed regions for both constant and time-varying models. The variation in conicity is assumed to be periodic thus the Floquet stability concept may be employed. The computation of the state-transition matrix is based on a Runge-Kutta algorithm.

A three-dimensional coupled dynamics model of the air spring of a high-speed electric multiple unit train

2016 ◽  
Vol 231 (1) ◽  
pp. 3-18 ◽  
Author(s):  
Zhuang Qi ◽  
Fu Li ◽  
Dalian Yu
Keyword(s):  
High Speed ◽  
Ride Comfort ◽  
Lateral Displacement ◽  
Three Dimensional ◽  
Coupled Model ◽  
Nonlinear Behaviour ◽  
Dynamics Model ◽  
Air Spring ◽  
Coupled Dynamics ◽  
Multiple Unit

Although air springs are widely applied on high-speed electric multiple unit (EMU) trains, there is no accepted method to model the dynamics of these air springs. In this paper, a three-dimensional (3D)-coupled dynamics model of an air spring used on a high-speed EMU train was created through the derivation of thermodynamics equations and using a curve-fitting method. Experimental and simulated stiffness tests were performed to verify the accuracy of the 3D-coupled model, which was then implemented in the MBS vehicle dynamics model. The influence of the nonlinear behaviour of the air spring on the vehicle’s dynamic performance was analyzed by a dual-simulation approach using the 3D-coupled model of the air spring and the dynamics model of the vehicle. From the results, it can be concluded that the air spring can improve the vehicle’s vertical ride comfort, due to its ability to adjust the vertical stiffness and damping based on the level of vibration. However, the vehicle’s ability to negotiate curves is reduced due to an increase in the air spring’s lateral and longitudinal stiffness, a result of the lateral displacement of the car body. Furthermore, the operation of the leveling valve in the 3D-coupled model can slightly reduce the vehicle’s overturning coefficient, which is a phenomenon that the normal air spring models cannot simulate. Finally, the 3D-coupled model was applied to simulate a leakage process, which is a complex series of chain reactions, in the air spring system. The calculation results indicate that, even though the ride comfort is severely degraded by the leakage, the vehicle’s running safety can still be guaranteed.

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