Abstract
In order to study the influence of quadrangular height difference of the bogie on the operation safety of a 25T railway passenger coach, a multi-rigid-body dynamical model is built. In numerical simulations, the quadrangular height difference of a twisted type, a pitch type and a roll type are investigated, respectively. It shows that the quadrangular height difference has a negative effect on the operation safety, namely the derailment coefficient and the wheel unloading rate. It is found that the twist type affects most, followed by the roll type and the pitch type in turn. When the quadrangular height difference increases, the derailment coefficient and the wheel unloading rate increase. When the quadrangular height difference reaches up to 12 mm, the vehicle can be operated safely at 160 km/h on tangent track and at 90 km/h on a curved track with a radius of 500 m as well as passing through a twisted track at a quite low speed.
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