Journal Article (Refereed)
Estimation of wheel-rail contact conditions and adhesion using the multiple model approach
Hussain, I & Mei, T X & Ritchings, T 2013, 'Estimation of wheel-rail contact conditions and adhesion using the multiple model approach', Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility, 51(1), pp.32-53.
This paper presents the development of a multiple model estimation approach for the identification of the adhesion limit to overcome the problem of the wheel slip/slide at the rail wheel-rail contact. The contact characteristics at the rail wheel-rail interface are both highly nonlinear and subject to changes due to exposure to external contaminations. The detection of adhesion and its changes is therefore scientifically challenging, but would provide a critical information in the control of trains to avoid undesirable wear of the wheels/track but also the safety compromise of rail operations. This study exploits the variations in the dynamic behaviour of the railway wheelset caused by the contact condition changes and applies a bank of Kalman filters designed at selected operation points for the adhesion estimation. A fuzzy logic system is then developed to identify the contact conditions by examining the residuals from the Kalman filters.
This paper describes a highly innovative model-based method to estimate the adhesion limit at the wheel-rail interface which is a very difficult issue for railway industry due to the complexity and uncertainty of the problem. The research work has drawn a substantial interest from both the rail industry and media. We were invited to present the work to the Cross Rail Industry Adhesion Research Group and also approached by a number of companies (Alstom, Knorr-Bremse, Portecrail and Halcrow) exploring application opportunities.
Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility