Abstract
The safe operation of high speed railway rolling stock such as the Shinkansen Line vehicle is achieved by securing the reliability of important parts of a car like axles and wheels.The strength design method for the car axle is based on JIS E 4501. According to this method, the design load is calculated by using a dynamic factor based on the vibrational acceleration of a car. This paper presents a method to determine a new dynamic factor based on the running test results. The design stress calculated by the new dynamic factor is smaller than that calculated by the old one, and is closer to actual stress. The maximum value of the actual stress is 60 to 90% of the design stress. It seems that the design safety factor based on the design method specified in JIS will give a value on the safe side.With the train speed up, the actual stress becomes larger; therefore the structural development of a light weight car and the improvement of fatigue strength of the axle are important measures to reduce the unsprung mass.
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