The Application of Roller Rigs to Railway Vehicle Dynamics

Jaschinski, A.; Chollet, Hugues; Iwnicki, Simon; Wickens, A. H.; Würzen, Jürgen von

doi:10.1076/vesd.31.5.345.8360

Cited by 99 publications

(63 citation statements)

References 10 publications

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“…The main design features of the scaled roller rig [5], referred to as MDM roller rig in the following, are described in [4,9] and summarised here for the convenience of the reader. The railway bogie roller rig is used to reproduce on the test rig the train behaviour in degraded adhesion conditions.…”

Section: General Architecture Of the Scaled Roller Rigmentioning

confidence: 99%

“…The control scheme proposed requires the on line estimation of the vehicle motor torque (to reduce the time of the setting up phase) by means of an estimator strategy that uses the roller angular velocity and the tangential component of the contact forces (measured on the support). Within this research activity, a scaled roller rig was designed and realised, with the aim of investigating the feasibility and the calibration of different control layouts that may be used also for the full-scale version [4,5]. In [5], the control laws for the definition of the roller torques and speeds were developed by means of considerations based on a simplified model that considered the system dynamics only in the longitudinal plane.…”

Section: Introductionmentioning

confidence: 99%

“…Within this research activity, a scaled roller rig was designed and realised, with the aim of investigating the feasibility and the calibration of different control layouts that may be used also for the full-scale version [4,5]. In [5], the control laws for the definition of the roller torques and speeds were developed by means of considerations based on a simplified model that considered the system dynamics only in the longitudinal plane. The possible interactions between the longitudinal and lateral dynamics were not investigated.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A numerical model of a HIL scaled roller rig for simulation of wheel–rail degraded adhesion condition

Conti

Meli

Pugi

et al. 2012

Vehicle System Dynamics

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PLEASE SCROLL DOWN FOR ARTICLEFull terms and conditions of use: http://www.tandfonline.com/page/terms-andconditions This article may be used for research, teaching, and private study purposes. Any substantial or systematic reproduction, redistribution, reselling, loan, sub-licensing, systematic supply, or distribution in any form to anyone is expressly forbidden.The publisher does not give any warranty express or implied or make any representation that the contents will be complete or accurate or up to date. The accuracy of any instructions, formulae, and drug doses should be independently verified with primary sources. The publisher shall not be liable for any loss, actions, claims, proceedings, demand, or costs or damages whatsoever or howsoever caused arising directly or indirectly in connection with or arising out of the use of this material. Scaled roller rigs used for railway applications play a fundamental role in the development of new technologies and new devices, combining the hardware in the loop (HIL) benefits with the reduction of the economic investments. The main problem of the scaled roller rig with respect to the full scale ones is the improved complexity due to the scaling factors. For this reason, before building the test rig, the development of a software model of the HIL system can be useful to analyse the system behaviour in different operative conditions. One has to consider the multi-body behaviour of the scaled roller rig, the controller and the model of the virtual vehicle, whose dynamics has to be reproduced on the rig. The main purpose of this work is the development of a complete model that satisfies the previous requirements and in particular the performance analysis of the controller and of the dynamical behaviour of the scaled roller rig when some disturbances are simulated with low adhesion conditions. Since the scaled roller rig will be used to simulate degraded adhesion conditions, accurate and realistic wheel-roller contact model also has to be included in the model. The contact model consists of two parts: the contact point detection and the adhesion model. The first part is based on a numerical method described in some previous studies for the wheel-rail case and modified to simulate the three-dimensional contact between revolute surfaces (wheel-roller). The second part consists in the evaluation of the contact forces by means of the Hertz theory for the normal problem and the Kalker theory for the tangential problem. Some numerical tests were performed, in particular low adhesion conditions were simulated, and bogie hunting and dynamical imbalance of the wheelsets were introduced. The tests were devoted to verify the robustness of control system with respect to some of the more frequent disturbances that may influence the roller rig dynamics. In particular we verified that the wheelset imbalance could significantly influence system performance, and to reduce the effect of this disturbance a multistate filter was designed.

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Section: General Architecture Of the Scaled Roller Rigmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A numerical model of a HIL scaled roller rig for simulation of wheel–rail degraded adhesion condition

Conti

Meli

Pugi

et al. 2012

Vehicle System Dynamics

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show abstract

“…On-track tests are usually quite expensive in terms of infrastructure and vehicle management. To reduce these costs, the performances of braking subsystems are traditionally investigated by means of full-scale roller-rigs [1][2][3][4]. Nevertheless, in case of degraded adhesion, the use of roller-rigs is still limited to few applications (full-scale roller-rigs for the study of the wear [5], HIL systems for WSP tests [16,20] and full-scale roller-rigs for locomotive tests [7,16,20]), since high slidings between rollers and wheelsets produce wear of the rolling surfaces.…”

Section: Introductionmentioning

confidence: 99%

An innovative hardware in the loop architecture for the analysis of railway braking under degraded adhesion conditions through roller-rigs

et al. 2014

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This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues.Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited. Nowadays, the longitudinal train dynamical behaviour is almost totally controlled by braking on board subsystems, such as Wheel Slide Protection (WSP) devices. The study and the development of these systems are fundamental for the vehicle safety, especially at high speeds and under degraded adhesion conditions. Traditionally, the performance of braking subsystems is tested on full-scale roller-rigs, to save time and to avoid expensive on-track tests. However, the study of the subsystem behaviour under degraded adhesion conditions on roller-rigs is still limited to few applications since high slidings among rollers and wheelsets generate wear of the rolling surfaces. This event is not acceptable because of the effects on the maintenance costs (the rollers have to be turned or substituted), on the system dynamical stability and on the safety. In this work the authors present an innovative Hardware In the Loop (HIL) approach for testing braking on board subsystems on full-scale roller-rigs. The new approach permits the reproduction on the rollerrig of a generic wheel-rail adhesion pattern and, in particular, of degraded adhesion conditions. The described strategy is the same implemented on the innovative full-scale roller-rig, recently built by Trenitalia and owned by SIMPRO, in the Railway Research and Approval Center of Firenze-Osmannoro (Italy). To validate the proposed approach, a complete model of the HIL system has been developed; the results provided by the simulation model have been compared to the experimental data provided by Trenitalia and relative to the on-track tests performed in Velim, Czech Republic, with a UIC-Z1 coach equipped with a fully-working WSP system. The complete model is based on the real characteristics of the components provided by Trenitalia. The preliminary validation performed with the HIL model highlighted the good performance of the HIL strategy in reproducing on the roller-rig the complex behaviour of the degraded adhesion during the braking of a railway vehicle. The next steps of the research activity will be the implementation both of the controller and the virtual vehicle model on the real Firenze-Osmannoro roller-rig.

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“…In fact the scaling factors which relates the scaled quantity to the unscaled ones represents a linear relation and not all the phenomena involved are linear. In order to choose the most suitable law, different models proposed in literature have been analysed and compared [4]. The prototype has been designed according the similitude law proposed by Jaschinski [2], whose most important scaling factors are shown on table 1.…”

Section: Introductionmentioning

confidence: 99%

Dynamic identification of a 1:5 scaled railway bogie on roller rig

Bosso¹,

Gugliotta²,

Somà³

2006

WIT Transactions on the Built Environment, Vol 88

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A Scaled Roller Rig is an experimental device to carry out laboratory tests on railway vehicles. The advantages of this method consist of low costs, low testing time and good repeatability. Different testing conditions, such as different friction, wear of profiles and axle load can be easily reproduced. Due to this reason many authors use roller rig to study railway dynamic, wear, noise and other railway problems. This work describes the experimental tests carried out to analyze the dynamical behaviour of a 1:5 scale railway bogie on a roller rig in tangent track conditions. The Roller Rig has been designed and realized at Politecnico di Torino and the first tests have been conducted on a single suspended wheelset.Tests performed on a single wheelset are used to validate the wheel/rail and wheel/roller contact algorithm and to adjust the parameters of numerical models. On the other hand the study of a complete railway bogie allows one to simulate the behaviour of a real vehicle and can be used in the design phase of new vehicles. For instance, it is possible to evaluate the effect of changes brought to the suspension system on the running dynamics of the vehicle.

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The Application of Roller Rigs to Railway Vehicle Dynamics

Cited by 99 publications

References 10 publications

A numerical model of a HIL scaled roller rig for simulation of wheel–rail degraded adhesion condition

A numerical model of a HIL scaled roller rig for simulation of wheel–rail degraded adhesion condition

An innovative hardware in the loop architecture for the analysis of railway braking under degraded adhesion conditions through roller-rigs

Dynamic identification of a 1:5 scaled railway bogie on roller rig

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