低速域におけるのり上がり脱線現象解明の一研究 : 第1報, 模型実験装置による基礎実験結果

抄録

The wheel climb derailment sometimes occurs when a train passes a steep curvature with low speed. To investigate this phenomenon, an experimentation using a model track and model trucks was done by the authors. The "Nadal Limit" has been used to evaluate the possibility of derailments. However, this Limit is so much changed by the friction co-efficient between rails and wheels that the Limit does not necessarily indicate the possibility of the derailment. The real possibility of derailments is shown by the wheel lift-up value from the rail. To measure this value exactly, the authors proposed a new measuring device upon a new conception which adopts a bundled optical fibers. They tried to measure the adhesion co-efficient instead of friction co-efficient between rails and wheels introducing the Slipping-adhesion Model Truck. As a result, they found that a wheel climb phenomenon sometimes causes a wheel slip-down phenomenon and that a wheel climb derailment occurs when the wheel climb-up value excesses wheel slip-down value.