A comprehensive heavy haul locomotive-track model and its application in assessing short-wavelength rail defects

The feasibility of monitoring short-wavelength rail defects such as dipped joints has been theoretically investigated by simulating a locomotive-mounted acceleration system negotiating several types of dipped rail de-fects. Initially, a comprehensive locomotive-track model is developed using the multi-body dynamics approach. In the model, the locomotive car-body, bogie frames, wheelsets and driving motors are considered as rigid bodies; track modelling is also taken into account. A quantitative relationship between the characteristics (peak-peak val-ues) of the axle box accelerations and the rail defects is then determined through simulations. Finally, the proposed approach, combining with defect analysis and comparison with experimental data, will enhance the ability for long-term monitoring and assessing track system, and more informed and preventative track maintenance strategies.