Effect of Railway Vehicle Parameters Variation on Derailment Running on Curved Track
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Date
2015-03
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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