Optimal Design of Profile of Groove-Shaped Rail of Modern Trams

Abstract:

A wear prediction model groove-shaped rail of modern trams is established， which fully considers the wheel-rail coupling effect of independent rotating wheel. The validity of the model was verified by comparison with the results of relevant literature. The characteristics of the rail wear of modern trams are analyzed by the proposed wear model. A profile optimization model of the rail based on augmented Gaussian radial primary function （AGRPF） is established， which is solved by using sequential quadratic programming （SQP） and multi-objective optimization principle. The results show that the main wear position of the outer rail is at the gauge angle of Y=30 mm， and the wear positions of the inner rail are at the top of the rail and the guard rail. Compared with the initial rail profile， the optimized effect of the rail profile is 15 % to 30 %， which can effectively reduce rail wear， especially side wear， increase wheel-rail contact area and reduce wheel-rail contact stress. The research results can provide a useful reference for the selection and maintenance of tram rails.