Haruka ASADA

The vibration of the bogie and the car body becomes remarkable with the speedup of the train, and there are effects, such as safety, riding comfort, rails or ground facilities. This is a very important problem. The problem of vibration in railway vehicles is a very important matter in terms of safety and riding comfort, and a detailed analysis is required. Our experiment was carried out using the roller rig model equipment in ４ kinds of wheel tread gradient（ 1/10 to 1/40）. The vibration of the railway vehicle is mainly caused by wheels and bogies running on the rail, and it is transmitted to the car body. Of great concern is the danger of derailment, when the hunting occurs at high speed and it has an adverse effect on riding comfort. In this paper, the hunting or phenomenon of railway vehicle generated at high running speed in comparison to low speed is verified using the roller rig model equipment. The purpose of this study is to clarify the relation with the natural vibration of the car body from the viewpoint of the bogie hunting phenomenon.

In recent years, as a natural disaster in Japan, there were damage from the 2011 Tohoku Region Pacific Offshore Earthquake and the 2016 Kumamoto Earthquake. In the event of a disaster, people who are difficult to evacuate can not escape, and sometimes they die. In this research, we investigate damage situation on natural disasters in recent years, and make basic experiments on running experiments simulating bad roads after disasters. Based on the results obtained from experiments, we aim to propose a wheelchair that can be utilized at the time of a disaster or after a disaster. In addition, riding comfort analysis was carried out using the vibration measuring device during the experiment. From the results of the research, it was shown that the introduction of a wheelchair driven vehicle aimed at reducing the load assuming natural disasters is effective. Also, by increasing the size of the front wheel, it is possible to alleviate the gap between the step and the step. It is possible to reduce the load exerted on the body by using a tire with less electric assistance or less resistance.