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오현석(Hyunsuk Oh),구정서(Jeongseo Koo) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
In this article, a theoretical derailment coefficient model on wheel climb and slip derailments was suggested. The theoretical derailment coefficient model is based on the theoretical derailment model of wheelset, which predicts derailments caused by axle loads. According to the domestic derailment safety regulation, the derailment coefficient, 0.8, has been stipulated as a critical figure. However, derailment coefficients corresponding to the different derailment types (Climb-up, Climb/roll-over, Roll-over-C, Slip-up, Slip/Roll-over and Roll-over-L) were not figured out. Here, the proper derailment coefficients was found out by considering the dynamic relations of the different derailment types to Q/P.
오현석(Hyunsuk Oh),구정서(Jeongseo Koo) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
In this thesis, new theoretical derailment coefficient model with using wheelset model is suggested. Traditional derailment coefficient from Nadal"s formulus, which has been using in domestic derailment rule, has difficulty in figuring out derailment coefficient under various conditions on wheel dimensions and applied forces. Therefore, the new theoretical derailment coefficient model was suggested to establish fundamental basis to determine the realistic derailment coefficient. The new theoretical derailment coefficient is mainly composed of various mechanical factors like the lateral force, the unloadings of left and right vertical forces, the friction coefficient, the wheel diameter, the wheel gauge, the distance between the suspension support and the wheel center point, a flange angle and so on. The validity of the theoretical derailment coefficient was confirmed with the dynamics simulations under the changes of the mechanical factors.