Experimental Setup of an Innovative Multi-Axle Roller Rig for the Investigation of the Adhesion Recovery Phenomenon

Bosso, Nicola; Gugliotta, Antônio; Magelli, Matteo; Zampieri, Nicolò

doi:10.1007/s40799-019-00327-x

Cited by 13 publications

(6 citation statements)

References 31 publications

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“…More details about the results can be seen in Zhou et al [44]. Similar experimental phenomena are found in the work of Boiteux [76], Zhang et al [58], Voltr et al [67] and Bosso et al [77,78]. This phenomenon of increasing adhesion after saturation is indicated as adhesion recovery.…”

Section: Discussionsupporting

confidence: 74%

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A Review on the Application of Friction Models in Wheel-Rail Adhesion Calculation

Yuan

Tian

et al. 2021

Urban Rail Transit

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Friction is the bond linking the tangential and normal forces at the wheel-rail interface. Modeling friction is the precondition for the wheel-rail adhesion calculation. In this work, the critical role of friction in the calculation of wheel-rail adhesion is discussed. Four types of friction models (Coulomb model, linear model + Coulomb model, rational model and exponential model) which are commonly used for the calculation of wheel-rail adhesion are reviewed, in particular with regard to their structural characteristics and application state. The adhesion coefficients calculated from these four friction models using the Polach model are analyzed by comparison with the measured values. The rational model and the exponential model are more flexible for defining the falling friction, and the adhesion coefficient calculated by these two models is highly consistent with the measured one. Though the rational model and exponential model describe the falling friction well, the existing friction models are not applicable for calculating adhesion after considering more realistic factors, such as thermal effect, contaminants and so on. Developing a novel and practical friction model to accurately describe the wheel-rail friction behavior is still an essential but challenging and significant task. This review provides a reference for the selection of existing friction models and generates fresh insights into developing novel and practical friction models.

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Section: Discussionsupporting

confidence: 74%

“…This phenomenon of increasing adhesion after saturation is indicated as adhesion recovery. The thermal effect due to the wheel-rail frictional heat and cleaning effect are considered the main reasons for the adhesion recovery [67,77,78]. Up to now, there has been no definite theory regarding adhesion recovery.…”

Section: Discussionmentioning

confidence: 99%

A Review on the Application of Friction Models in Wheel-Rail Adhesion Calculation

Yuan

Tian

et al. 2021

Urban Rail Transit

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“…It can be seen from Figure 1 that all axles have been continuously sliding, and the braking force of each axle is periodically reduced, maintained and increased because of the effect of anti-skid device, so as to prevent wheelset from locking and make greater use of adhesion, so that the train can be braked to stop. It can be seen from Figure 2 that although the actual deceleration of the train fails to reach the target deceleration, the actual deceleration of the train increases gradually in the whole braking process, which is because of the gradual improvement of the adhesion level between wheel and rail because of the braking anti-skid control (Bosso et al , 2019).…”

Section: Methods and Modelsmentioning

confidence: 99%

An improved degraded adhesion model for wheel–rail under braking conditions

Zhu

Zheng

et al. 2021

ILT

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Purpose The purpose of this paper is to develop an improved adhesion model to better reproduce the low adhesion condition of the anti-skid control for rail vehicles under braking condition. Design/methodology/approach In view of the low adhesion characteristics for rail vehicles under braking conditions, the Polach adhesion model was improved based on the sliding power and sliding energy. The wheel–rail low adhesion model suitable for braking condition was given. The analysis of braking anti-skid control under emergency braking condition was carried out through the co-simulation, and compared with the test data; the effectiveness and practicability of the improved low adhesion model were verified. Findings The results showed that the improved adhesion model is simple and efficient and the parameters involved are less, and it can be directly applied to the real-time simulation of anti-skid control in the process of train braking. Originality/value This paper can provide a theoretical reference for the reasons of change and improvement of adhesion between wheel and rail caused by the adjustment of braking force under anti-skid control, which can fulfill a need to the study of sliding energy on the contact surface, the removal effect of pollutants on the wheel–rail surface and the improvement and recovery of adhesion caused. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-07-2020-0244/

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“…Therefore, the research group investigated the possibility of validating the new monitoring system, able to detect the conditions of the brake system components, by means of laboratory test rigs [25][26][27][28]. The new MU provided with functions for the brake system monitoring was tested on innovative scaled multi-axle roller-rig [29][30][31][32], which was originally designed to investigate degraded adhesion conditions and adhesion recovery phenomena [33]. The roller-rig mechanical structure includes two rollers, powered by a single brushless motor, and four wheelsets.…”

Section: Testing On Roller-rigmentioning

confidence: 99%

Monitoring systems for railways freight vehicles

Bosso¹,

Magelli²,

Zampieri³

2022

Int. J. CMEM

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Monitoring systems are a key tool to improve the safety of railway vehicles and to support maintenance activities. Their on-board application on railway vehicles is currently well established on newly built passenger vehicles, while their use on freight vehicles is not yet sufficiently widespread. This is due to the complex management of the operating procedures of the freight wagons, to the substantial impact of the cost of these systems compared to the cost of the wagon and to the common lack of electrification on freight wagons.This work illustrates the characteristics of a monitoring system developed at Politecnico di Torino and previously installed on freight vehicles and operationally tested as regards the detection of accelerations and temperatures as diagnostic parameters. This system has been improved by adding diagnostics of the vehicle braking system, in order to detect anomalies during braking operations and to support maintenance procedures. The activity described in the present work aims to identify, beyond the specific diagnostic system that has been implemented, the basic characteristics that a modern monitoring system, intended to be installed on railway freight wagons, should feature. The new version of the monitoring system that has been developed at Politecnico di Torino has been preliminarily tested on a scaled roller-rig in order to monitor the braking system even in abnormal operating conditions, which would be difficult to reproduce safely on a real vehicle. The monitoring system is equipped with an axle generator capable of autonomously supporting its operation, and it is also provided with a diagnostic information processing system and communication protocols to send outside this information.

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Experimental Setup of an Innovative Multi-Axle Roller Rig for the Investigation of the Adhesion Recovery Phenomenon

Cited by 13 publications

References 31 publications

A Review on the Application of Friction Models in Wheel-Rail Adhesion Calculation

A Review on the Application of Friction Models in Wheel-Rail Adhesion Calculation

An improved degraded adhesion model for wheel–rail under braking conditions

Monitoring systems for railways freight vehicles

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