Effect of Railway Vehicle Parameters Variation on Derailment Running on Curved Track

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Date

2015-03

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Publisher

AAU

Abstract

Railroad systems are the most widely used methods of transporting passengers in the world, so the system must be safe and comfortable. Safety is one of and critical railway system running behaivior. In this paper effect of railway vehicle parameters varation on derailment running on curved track at curved critical speed was studed. The parameters are carbody parameters(mass,rolling mass moment of inertia Ixx, pitch mass moment of inertia Iyy, yaw mass moment of inertia Izz and vertical mass center ), secondary suspenssion parameters, wheelbase distance and wheel radius. Each parameters in the study had to varying 25% upper and lower of original designed value. The study has been peformed by developing 41 DOFs, 4 axles and two bogie railway vehicle with SIMPACK software. First it was determined the curved track critical speed of the model vehicle on curved track scenario, when increasing speed above this maximum speed derailment occurs on the railway vehicle. After determination of the curved critical speed or maximum safe speed parameteric varation was analaysed. In general terms, it was concluded that carbody mass, carbody yaw mass moment of inertia(Izz), carbody height of center of mass, secondary spring longitudinal shear stiffness, wheel base and wheel radius are more sensitive to derailment, thus parameters have a roll to improve curved track critical speed and safety design of railway vehicle. Increasing or decreasing of rolling mass moment of inertia(Ixx) of carbody, pitch mass moment of inertia(Iyy) of carbody, secondary vertical damper damping and secondary lateral damper damping, decreasing secondary spring lateral shear stiveness and secondary spring vertical shear stiffness have no effect to derailment of railway vehicle running on curved track at curved critical speed. This research analyzes only the safety running behaivor of of the railway vehicle running on curved track, this means in the study was not included other running behaivior such as ride confort and wear. These parametric variation may have negative effect on other running behaivior. There fore decreasing yaw mass moment of inertia(Izz) of carbody, vertical mass center of carbody, secondary spring longitudinal shear stiveness, bogie wheelbase, wheel radius below the original value have safe to risk of derailment and improve curved track critical speed, but to take the parameters variation as positive the effect of those vriation will investigate to other running behaivior, must be improved or with in the permissible limit.

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Keywords

Curved Track, Railway Vehicle Parameters

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