鉄道車両は走行距離が増加するにつれ，車輪踏面の摩耗により，その運動特性が変化することが知られている。このため，近年，車輪踏面の摩耗に起因する車両運動特性の変化に関して計算機を用いた解析を行うとともに，走行安全性や乗り心地に優れた車両の開発に活用しようとする動きがある。%In the study presented in this paper, calculation of the contact patch between a measured wheel tread profile and a designed rail shape was carried out strictly by using a general software program called TED/CPA in order to investigate a contact characteristics between them. Then a calculation method of a creep coefficient was proposed with focus on a contact patch under the multi-point contact condition, and we applied this proposed method to the contact condition between the measured wheel tread profile of commercial vehicle and the designed rail shape. As a result, it has been shown that the contact patch has the shape composed of many contact areas due to uneven-ness of wheel tread, and the estimated creep coefficient may be smaller than the Kalker's theoretical value.
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