某城市地铁振源系统参数影响预测

Prediction on vibration source system of a city subway considering parameter influence

为了研究正在建设的某城市地铁振源系统,根据地铁拟采用的车型、块下胶垫和扣件等参数,建立车轨垂向耦合振动模型。计算车体、轮对和道床的垂向最大振动加速度,分析车体运行的平稳性及振源的减振效能。结果表明:该城市地铁拟采用的振源系统具有良好的减振效能;A型车车体运行平稳性优于B型车;低速时,参数的选取对振源系统的减振效能没有明显影响,随着车速的增加,减振效能呈降低趋势且不同参数间差距扩大,但当车速大于60 km/h时,减振效能趋于稳定;对减振效能的贡献,扣件最大,块下胶垫的阻尼其次,而A、B型车体和块下胶垫的刚度影响则不明显。

In order to study vibration source system of a unfinished city subway, vehicle-track vertical coupled model of vibration was established base on the parameters proposed about vehicle types, block pads and rail fastenings. Maximum vertical vibration accelerations of vehicle, wheel sets and track bed were calculated, stability of vehicle and damping effect of vibration source were analyzed. Analysis results showed that vibration source has a better damping effect on Fuzhou subway;stability of A-type vehicle was better than that of B-type vehicle;the parameters selection of vibration source system did not significantly affect the damping effect in low speed, with the increase of speed of the vehicle, damping effect gradually decrease and the gap expand considering different parameters, but it tend to be stable when the speed was more than 60 km/h;the rail fastening was the biggest contributor to damping effect, damping of block pad has some contribution, and the contribution of vehicle type and block pad stiffness was not distinct.