최적화를 통한 동력분산형 철도차량의 횡방향 승차감 개선에 관한 연구

초록

This paper reports the improvement of the lateral ride comfort of a hydrogen railway vehicle, which is a type of power distribution type railway vehicle. The hydrogen railway vehicle in this study is a railway vehicle using a hydrogen fuel cell as a power source, which is being developed as a national research and development project. It is a two-car train. The bogie consists of four units, including two power bogies and two auxiliary bogies. The ride comfort of hydrogen railway vehicles was evaluated by dynamic analysis using Vampire, a railway vehicle dynamics software, according to the KS R 9216 standard. The ride comfort of a hydrogen railway vehicle when driving a 5km straight section at 150km/h was 109.2dB, which was 'normal', and the vertical ride comfort was 98.7-99.1dB. The ride comfort in the lateral direction needs to be improved. Sensitivity analysis and optimization were performed on the existing suspension design to improve the lateral ride comfort, which could be improved by 25.8%. To further improve the lateral ride comfort, it was suggested to change the wheel profile to S1002 instead of the currently used KNR20. Therefore, changing the wheel profile to S1002 is a simple solution to the excessive vibration in the lateral direction of the vehicle body during an on-track test.

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