用有限元法分析轮胎结构与滚动阻力的关系

子午线轮胎的滚动阻力是影响汽车燃油经济性的一个基本因素,它受到越来越多的汽车生产商和消费者的重视.到目前为止,我国轮胎企业在降低轮胎滚动阻力方面所采取的措施主要是降低橡胶,特别是胎面胶的损耗因子,基本上很少从结构上考虑如何降低滚动阻力. 采用3D有限元分析法对特定的子午胎在不同负荷、不同速度下的滚动阻力进行了预测,在有限元模型的建立上,利用MSC.MARC软件,对子午胎的胎体、带束层、胎圈等部位采用了膜加强筋单元以及实体加强筋单元进行模拟,对橡胶材料则采用Yeoh材料模式来描述,橡胶的滞后损失由橡胶加工分析仪获得.所得的结果与实测值进行了比较,并获得了良好的效果.在此基础上,通过改变子午胎的结构设计参数以及橡胶的损耗因子,分别计算滚动阻力的变化,主要讨论结构设计参数变化对子午胎滚动阻力的影响.

The relationship between the tire construction and rolling resistance using FEM

The rolling resistance of radial tires is an essential factor influencing the fuel economy ,it has been received more attention by automakers and consumers. At present, the reduction of rolling resistance is mainly to decrease the bysteretic loss factor of the rubber material,especially tread rubber. There are no considerations from the tire construction. In this paper, 3D finite element method is used to predict the rolling resistance of the radial tire in different load and different velocity. About the FEA model, using the MSC. MARC, the membrane rebar element was used to describe the tire carcass,belt and bead. Yeoh model was used to describe the rubber materials. The hysteretic loss factors of the rubber materials are obtained by RPA. The calculated values are compared with experimental results. The good results had been obtained. Then through changing some tire design parameters calculated the rolling resistance. The relationship between the tire design parameters and rolling resistance has been demonstrated.