地铁车辆车轮多边形化形成原因分析

针对地铁车辆车轮多边形化问题，探讨分析车轮多边形化形成原因。提出车轮多边形化是由车轮滚动多周的振动所形成的这一创新观点，并分析车轮多边形化的顶点相位角、主振频率与运行速度之间的关系。以某直线电动机地铁车辆为例，基于建立的多体动力学模型，研究各速度下轮轨垂向力的主导频率，分析易产生车轮9边形化的速度及主导频率特性，指出在72～80 km/h的速度范围内，该直线电动机地铁车辆有形成车轮9边形化的可能。以72 km/h和80 km/h为例，给出此速度下的轮轨垂向力及其主导频率、前转向架直线电动机垂向振动加速度及其主振频率，结果表明两种速度下主导频率分别为39.08 Hz和43.48 Hz的振动有形成车轮9边形化的趋势。指出各速度下的相位角变化，并给出车轮9边形化的示意图。

Analyses of the Form Reason of Wheel Polygonization of Subway Vehicle

Aimed at the wheel polygonization problem of the subway vehicle, discussed the forming reason of the wheel polygonization, put forward the innovation point that the wheel polygonization is caused by the wheel/rail vibration during many wheel rolling circles, and derived the relation between the phase angle of the vertex, main vibration frequency and the running speed of the polygonization wheel. Take one kind of linear induction motor subway vehicle for example, based on the multi-body system dynamic model, the main frequency of the wheel/rail vertical force under different speed is researched, the speed and main frequency which easily induced the wheel polygonization with 9 vertexes is analyzed, and pointed out that the wheel polygonization with 9 vertexes of the subway vehicle maybe formed during the speed scope from 72 km/h to 80 km/h. Take the case of 72 km/h and 80 km/h for example, the results of the wheel/rail vertical force and the main frequency is given in the paper, as well as the LIM of the front bogie. Simulation results show that the wheel polygonization with 9 vertexes maybe formed by the vibration with the frequency of 39.08 Hz and 43.48 Hz. The phase angle changes between the different speeds are present and the sketch map of the wheel polygonization with 9 vertexes is given, too.