转K7型转向架轮对径向装置抗剪刚度设计

Design of shear stiffness of wheelsets radial device for K7 bogie

针对转K7型副构架式自导向径向转向架,通过相关结构受力与刚度串并联关系分析,明确了决定其轮对径向装置抗剪刚度的几何和刚度参数,构建了抗剪刚度的数学计算公式。基于车辆系统动力学分析技术,确定了转K7型转向架轮对径向装置所需抗剪刚度为11MN·m-1。考虑转向架结构实际受限条件,对轮对径向装置各组成件的几何和刚度参数进行匹配设计。首先设计确定出对角斜撑角和连接杆轴向拉压刚度分别为42°和150MN·m-1,然后使用抗剪刚度数学计算公式导出所需的副构架结构横向刚度应不小于23.6MN·m-1,进而按该参数要求对副构架结构进行相应设计。考虑部件间接触配合关系,建立了轮对径向装置的高仿真非线性有限元装配体分析模型。计算结果表明:结构横向刚度为24MN·m-1,达到了轮对径向装置抗剪刚度的设计要求;抗剪刚度为所需设计值11MN·m-1,验证了抗剪刚度数学计算公式和设计方法的可靠性。

Through analyzing the stress and stiffness series parallel relations of correlative structures,the geometry and stiffness parameters determining the shear stiffness of wheelsets radial device for K7 sub-frame self-steering radial bogie were defined,and the mathematic calculating formula for the shear stiffness of wheelsets radial device was established.Based on vehicle system dynamics analysis technology,the required shear stiffness of wheelsets radial device was determined as 11 MN·m-1.Considering the practical constrained conditions of bogie structures,the matching design of geometry and stiffness parameters for the components of wheelsets radial device was carried out.First of all,the diagonal brace angle and axial tension-compression stiffness of link bar were respectively determined as 42° and 150 MN·m-1.Further,the required structural transverse stiffness of sub-frame,deduced by the mathematic calculating formula of shear stiffness,should not be below 23.6 MN·m-1.Then,aiming at the requirement of the parameters,the corresponding structural design of sub-frame was carried out.Considering the contact fitting relations among different components,the high-precise nonlinear FE assembly analysis model of wheelsets radial device was established.Calculation result shows that the final structural transverse stiffness is 24 MN·m-1,so the design requirement for the shear stiffness of wheelsets radial device is achieved.The calculated shear stiffness is 11 MN·m-1 and equals to the required design value,so the reliability of mathematic calculating formula and design method for the shear stiffness is verified.