Research on the impact of traction characteristics on the dynamics of urban rail trains in environments with abrupt changes in adhesion coefficient

• Published in: Engineering Research Express Vol. 7; no. 3; pp. 35522 - 35542
• Main Authors: Wen, Xiaorui, Wang, Jinhai, Wang, Yuzhu, Xu, Danping, Yang, Jianwei
• Format: Journal Article
• Language: English
• Published: IOP Publishing 30.09.2025
• Subjects: dry/slippery track; dynamic characteristic; dynamic model; traction torque; urban rail train
• ISSN: 2631-8695; 2631-8695
• DOI: 10.1088/2631-8695/adede5

Severe meteorological conditions such as precipitation and snowfall frequently induce abrupt variations in the adhesion coefficient at the junctions between underground and elevated segments, or at the exits of elevated stations within urban rail transit systems. These fluctuations create a challenging operational environment and negatively impact the performance of the train traction system. To address this issue, the study develops a comprehensive dynamic model of urban rail trains that incorporates the drive system, and investigates strategies to enhance train dynamic performance under low adhesion scenarios. This includes optimizing traction characteristics and adjusting the position of adhesion transition points. The findings indicate that moderate reduction of traction torque combined with delaying the adhesion mutation point can substantially decrease slip rates, mitigate wheelset idling and slipping, and enhance longitudinal vibration stability. These modifications contribute to improved overall operational performance. Furthermore, the proposed approach effectively diminishes the derailment coefficient, wheel load reduction rate, and lateral and vertical Sperling indices, thereby significantly enhancing safety and riding comfort. This research offers a theoretical framework and practical guidance for operational control strategies of urban rail systems under adverse meteorological conditions.