Uyulan Ç.

ADVANCES IN SCIENCE AND TECHNOLOGY-RESEARCH JOURNAL, vol.12, no.1, pp.207-220, 2018 (ESCI) identifier


Adhesion coefficient and the resultant normal force occurred at the wheel-rail contact determine braking and traction forces in railway applications. Due to the limits on controlling the resultant normal force. maximization of the adhesion coefficient is the only way to obtain larger braking and tractive works. There are various advantages of utilization of adhesion in an efficient way, such as reducing operating costs, minimizing trip time, preventing wheel-rail wear. On the other hand, the adhesion mechanism at the wheel-rail contact has a highly non-linear complex nature, whose dynamics are changed as a function of parameters like environmental conditions, vehicle speed, slip ratio etc. There is not any satisfactory accurate and trustworthy way of estimating these parameters yet. In this paper, an event based adaptive control scheme has been introduced to maximize the adhesion coefficient without requiring the exact value of those parameters. The efficient adhesion utilization can be obtained by using the proposed method while maintaining the stability. The continuous excitement of traction system and slow recuperation detection time difficulties in the former research has been overcome. The dynamics of phase shift were analyzed and an adaptive structure were built. Results acquired by using the proposed adaptive method were compared with the conventional control scheme in "Matlab&Simulink" software under various driving scenarios and wheel-rail contact conditions.