Keywords: WSP, articulated freight wagon, pneumatic brake, braking system, wheel-rail contact forces, degraded wheel-rail contact.

This study focuses on the implementation of a Wheel Slide Protection (WSP) controller system for an articulated freight wagon. The primary objective of the WSP system is to mitigate wheel sliding on the rail, especially during intense braking manoeuvres under degraded rail conditions. Uncontrolled sliding can lead to severe damage to both the wheels and the infrastructure, posing significant threats to the dynamic stability and overall safety of the entire train. To address this issue, we develop a comprehensive numerical model of the freight wagon, with a specific emphasis on its pneumatic braking system. Additionally, we incorporate a detailed model of the wheel-rail contact problem, accounting for various rail conditions. Subsequently, we introduce a control logic intended to reduce the wheel sliding and we introduce a physical model of the WSP system to validate the efficacy of the control logic. This paper presents the outcomes of a preliminary WSP system, showcasing its effectiveness in preventing wheels from sliding. The comprehensive approach taken in modelling and implementing the WSP system contributes valuable insights into enhancing the safety and performance of articulated freight trains, particularly under challenging rail conditions.

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