磁浮车辆悬浮架托臂连接螺栓仿真分析

Simulation analysis of connecting bolts of suspension bracket arm of maglev train

为满足轻量化要求,磁浮车辆悬浮架采用铝合金材料制造,但铝合金材料可焊性较差,需要采用螺栓进行连接。铝合金母材内螺纹较弱,故需配合钢丝螺套进行使用。文中采用Hypermesh建立了螺栓连接结构的三维弹塑性模型,使用Ansys对该模型进行了接触非线性分析,探究了钢丝螺套对螺栓承载性能的影响。基于圣维南原理,采用子模型法,对悬浮架托臂螺栓连接处进行精细化有限元建模和分析,并采用Von Mises应力评估了悬浮架托臂螺栓连接处的强度。结果表明,钢丝螺套能有效地降低托臂连接螺栓及螺纹孔的应力,可以保障磁浮车辆的安全运营。

In order to meet requirements on weight reduction,the suspension bracket of maglev train is made of aluminum alloy,but the weldability of aluminum alloy is poor,so bolts are needed for firm connection.The strength of internal thread of aluminum alloy parent metal is low,so it needs to be used with wire thread insert.Three-dimensional elasto-plastic modeling of bolt connection structure was carried out with Hypermesh,and contact nonlinear analysis of this model was conducted by Ansys,and the influence of wire thread insert on bolt bearing performance was discussed.Based on the Saint-Venant principle,the fine finite element modeling and analysis of the bolt connection structure of the suspension bracket arm were done by submodel method,and the strength of the bolt connection of the suspension bracket arm was evaluated with Von Mises stress assessment.Results show that the wire thread insert can effectively reduce the stress in the connecting bolt and threaded hole of the bracket arm,and can ensure the safe operation of the maglev train.