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T. Wang^1,2, W. Wang^1,3, J. Ding^1,2 and J. Zuo^1,2

¹College of Transportation, Tongji University, Shanghai, China
²Shanghai Key Laboratory of Rail Infrastructure Durability and System Safety, Tongji University, China
³National Maglev Transportation Engineering R&D Center, Tongji University, Shanghai, China

doi:10.4203/ccc.15.9.6

T. Wang, W. Wang, J. Ding, J. Zuo, "A Resilience-Based Metric Framework for Quantifying Dynamic Wheel–Rail Adhesion Recovery", in J. Pombo, (Editor), "Proceedings of the Seventh International Conference on Railway Technology: Research, Development and Maintenance ", Civil-Comp Press, Edinburgh, UK, Online volume: CCC 15, Paper 9.6, 2026, doi:10.4203/ccc.15.9.6

Keywords: wheel–rail adhesion, resilience metric, braking safety, low adhesion, adhesion recovery, sanding.

Abstract

Low wheel-rail adhesion is a braking-safety concern because the maximum usable adhesion coefficient may be insufficient and its recovery after contamination or adhesion-enhancement intervention can be highly transient. This paper proposes an adhesion-resilience metric framework for quantifying degradation, lag, recovery and post-recovery steady behaviour. Dimensionless indices for robustness, recovery ability, adhesion utilisation efficiency, recovery rate, recovery intensity and temporal response are combined into an integrated adhesion-resilience index. Digitised rolling-contact curves from two published case groups, wet-contact sanding and oil-contamination tests, are re-analysed. Because the source curves use cycles as the horizontal coordinate, a generalised process coordinate is adopted. The results show that the proposed metrics provide information beyond maximum adhesion and support low-adhesion braking-safety assessment.

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Front Page Browse CCC CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Conferences ISSN 2753-3239 CCC: 15 PROCEEDINGS OF THE SEVENTH INTERNATIONAL CONFERENCE ON RAILWAY TECHNOLOGY: RESEARCH, DEVELOPMENT AND MAINTENANCE Edited by: J. Pombo Paper 9.6 A Resilience-Based Metric Framework for Quantifying Dynamic Wheel–Rail Adhesion Recovery T. Wang^1,2, W. Wang^1,3, J. Ding^1,2 and J. Zuo^1,2 ¹College of Transportation, Tongji University, Shanghai, China ²Shanghai Key Laboratory of Rail Infrastructure Durability and System Safety, Tongji University, China ³National Maglev Transportation Engineering R&D Center, Tongji University, Shanghai, China doi:10.4203/ccc.15.9.6 Full Bibliographic Reference for this paper T. Wang, W. Wang, J. Ding, J. Zuo, "A Resilience-Based Metric Framework for Quantifying Dynamic Wheel–Rail Adhesion Recovery", in J. Pombo, (Editor), "Proceedings of the Seventh International Conference on Railway Technology: Research, Development and Maintenance ", Civil-Comp Press, Edinburgh, UK, Online volume: CCC 15, Paper 9.6, 2026, doi:10.4203/ccc.15.9.6 Keywords: wheel–rail adhesion, resilience metric, braking safety, low adhesion, adhesion recovery, sanding. Abstract Low wheel-rail adhesion is a braking-safety concern because the maximum usable adhesion coefficient may be insufficient and its recovery after contamination or adhesion-enhancement intervention can be highly transient. This paper proposes an adhesion-resilience metric framework for quantifying degradation, lag, recovery and post-recovery steady behaviour. Dimensionless indices for robustness, recovery ability, adhesion utilisation efficiency, recovery rate, recovery intensity and temporal response are combined into an integrated adhesion-resilience index. Digitised rolling-contact curves from two published case groups, wet-contact sanding and oil-contamination tests, are re-analysed. Because the source curves use cycles as the horizontal coordinate, a generalised process coordinate is adopted. The results show that the proposed metrics provide information beyond maximum adhesion and support low-adhesion braking-safety assessment. download the full-text of this paper (PDF, 15 pages, 392 Kb) go to the previous paper go to the next paper return to the table of contents return to the volume description
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