我国地铁已进入蓬勃发展时期。地铁快线车辆运行过程中形成的车轮高阶多边形磨耗已对列车运营造成较大困扰，但其形成机理尚不明确。本项目首先将开展车轮非圆化磨耗跟踪测试、车辆轨道关键部件振动测试，掌握车轮非圆化磨耗特征和车辆轨道振动特性。然后建立考虑牵引/制动控制的地铁列车-无砟轨道三维刚柔耦合动力学模型，模型中考虑轮对和轨道中高频弹性变形及其动力相互作用；推进轮轨中高频弹性变形下的轮轨接触建模、非椭圆和大蠕滑滚动接触力学建模；随后将动力学模型、轮轨滚动接触力学模型与车轮材料摩擦磨损模型相结合，构建地铁车轮非圆化磨耗预测模型。通过数值仿真，辨识影响车轮高阶多边形磨耗形成的关键因素，探明车轮多边形磨耗演变规律，结合试验研究，揭示其形成机理。最终制定车轮高阶多边形磨耗维护准则，提出车轮多边形磨耗抑制措施。本研究不仅能促进车轮多边形磨耗理论的发展，而且对地铁可持续发展和全寿命周期低成本运营具有重要意义。

China's subway is developing vigorously at present. The wheel high-order polygonal wear of metro express vehicle has caused great trouble to the operation of trains, but its formation mechanism has not been explained clearly yet. Firstly, the project will carry out the wheel out-of-roundness (OOR) tracking test and vibration tests of vehicle and track to the characteristics of wheel OOR and key components' vibration. Then, a 3D rigid-flexible dynamics model of metro train coupled with ballastless track is established, which considers the traction/braking control of the train, and the elastic deformation and dynamic interaction between wheelset and track in the medium-high frequency range. The wheel-rail contact model including the medium-high frequency elastic deformation of the wheel and rail, and non-elliptical and large creep rolling contact model are promoted. The dynamics model and wheel-rail rolling contact model are combined with the wheel wear calculation model to build the OOR wear prediction model of metro wheels. Through numerical simulation, the key factors affecting the formation of wheel high-order polygonal wear are identified. The evolution law of wheel polygonization is verified. The formation mechanism of wheel high-order polygonization is clarified based on combining simulations and experiments. Finally, the maintenance criterion of wheel high-order polygonal wear is formulated, and the measures to mitigate the wheel polygonal wear are proposed. This study can not only promote the development of wheel polygonal wear theory, but also has an important significance for the sustainable development of metro system and low-cost operation in the whole life cycle.