Evaluation of Strength for Bogie Frame of Railway Freight Car Through Finite Element Analysis

초록

Bogie is the connection device between carbody and wheel in railway vehicles. It is the core part that exert a important effect on the riding quality and running safety. A static and dynamic load have acted on it complexly. When the bogie is designed, a finite element method, static load test, fatigue test, running test should be considered. A welded structure type bogie was developed for high speed freight car. But some bogie frames have the problems in end beam. There were some cracks in end beams. The crack situation of the end beam have a bad effect on the brake system. In that case, the cars would be in danger of derailment. This report shows the cause of end beam crack, improvement method. In order to clear the crack cause, many tests were tried. The test result concludes that the crack cause of the end beam is not the brake load but the vibration at the main line running on the track. It is estimated that the improved car which end beam was reinforced was safe enough within permitted life of the car. On the basis of the results, the existing end beam was improved. In this paper, through finite element analysis, examined structural strength of end beam. The safe of the improved end beam was proved by main line test on the track. The operation of freight car have no problems any more.