Comparative Analysis On Dynamic Performance Of A?B Type Metro Vehicle

Subway,as a kind of underground traffic system,relieves traffic congestion on the ground,energy source saving and reduce environmental pollution.A?B type metro vehicles as the most frequently used two types of metro,according to its different structural characteristics,choose more suitable for its running line conditions.It can not only improve the dynamic performance,but also reduce operation maintenance costs,prolong the service life of each part of the metro.This paper based on the dynamics of vehicle/ track system.Application of multi body dynamics software SIMPACK to establish the vehicle/ track model of A type and B type metro vehicles.Under the conditions of different running speed,passenger-capacity,track gradient,rail friction coefficient,track excitation,wind force and curve radius,the dynamic indexes such as the lateral displacement of the car body,the acceleration of the vehicle body,the vertical force between wheel and rail,wheel unloading rate,derailment coefficient and critical velocity of the A type and B type metro vehicles are analyzed,conclusion: When the track is straight,the lower speed,the better comfort to ride,the more passenger,the better safety to ride;When the track is curve,the larger slope,radius and lower speed,the better comfort to ride,the more passenger,larger radius and smaller wind,the better safety to ride.According to comparison,it's better comfort to ride B type metro and it's better safety to ride A type metro.when the line conditions are good,it's better to choose B type metro vehicle for better comfort;when the line conditions are bad,it's better to choose A type metro vehicle for running safety.According to different circuit conditions to choose different vehicles,in order to improve the service life of vehicles and reduce maintenance costs.