铁道建筑

通过对轮对、钢轨和轨道板进行柔性化处理，构建了CR400BF动车组拖车-轨道刚柔耦合动力学模型，开展了车轮多边形和钢轨波磨耦合对高频振动影响的研究。结果表明：车轮多边形与钢轨波磨耦合激励下轮轨垂向力和钢轨振动加速度存在两个主频，分别对应车轮多边形和钢轨波磨的激励主频，两者频率接近时会发生拍振现象；140 mm波长、0.02 mm幅值的波磨与0.02 mm幅值的22阶多边形耦合时，轮轨垂向力比车轮多边形和钢轨波磨单一激励均增加了约23%，钢轨振动加速度比车轮多边形和钢轨波磨单一激励时分别增加了18.5%和40.0%；车轮多边形与钢轨波磨耦合激励下，轮轨垂向力和钢轨振动加速度均随车轮多边形阶数增大而增大，随钢轨波磨波长增大而减小。

A dynamic model of CR400BF EMU(Electric Multiple Unit) trailer-track rigid flexible coupling was constructed by flexible treatment of wheelsets, rails, and track plates, and the influence of wheel polygon and rail corrugation coupling on high-frequency vibration was studied. The results show that there are two main frequencies for the wheel-rail vertical force and rail vibration acceleration under the coupling excitation of wheel polygon and rail corrugation, corresponding to the excitation main frequencies of wheel polygon and rail corrugation, respectively. When the frequencies of the two are close, the beat vibration phenomenon will occur. When a wave with a wavelength of 140 mm and an amplitude of 0.02 mm is coupled with a 22nd order polygon with an amplitude of 0.02 mm, the wheelrail vertical force increases by about 23% compared to the single excitation of the wheel polygon and rail corrugation.The vibration acceleration of the rail increases by 18.5% and 40.0% respectively compared to the single excitation of the wheel polygon and rail corrugation. Under the coupling excitation of wheel polygon and rail corrugation, the wheel-rail vertical force and the vibration acceleration of rail both increase with the increase of wheel polygon order, and decrease with the increase of rail corrugation wavelength.