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为实现重载货车转向架轮轨低动力作用,根据中国铁路重载运输的实际情况和转K7型转向架的运用效果提出了一种新型货车径向转向架方案:对原整体副构架结构进行优化,采用了独立承载鞍,并由内外侧两铆钉连接承载鞍和副构架体。基于多体系统动力学方法,以中国C70EF型敞车为研究对象,利用SIMPACK软件建立车辆-轨道耦合动力学模型,计算了新型径向转向架轮轨动力性能,分析了副构架和承载鞍作用力的规律,并以此进行了副构架连接可靠性的有限元仿真计算和疲劳可靠性台架试验。分析结果表明:与转K7型转向架相比,新型径向转向架受到0.01rad的轨道低接头脉冲激扰时,可降低轮轨低频力约10.78%;受到AAR5动态线路激扰时,轮轨垂向力和横向力可分别降低约2.98%~4.03%、2.96%~9.77%,整车轮轨磨耗功率降低约5.03%~29.46%;承载鞍内侧铆钉受力明显大于外侧铆钉,内侧铆钉孔边缘应力最大值约为180.76MPa,铆钉剪切应力为58.13MPa,均小于相应材料的许用应力345、128MPa,具有足够的疲劳强度和运用可靠性。
In order to realize the low dynamic force of heavy duty truck bogie wheel and rail, a new type of truck radial bogie scheme is put forward according to the actual situation of heavy haulage in China and the application effect of K7 bogie. Optimized, using a separate bearing saddle, and by the inside and outside the two rivets to connect the load-bearing saddle and vice-body. Based on the multi-body system dynamics method, the Chinese C70EF gondola is taken as the research object, the vehicle-track coupling dynamic model is established by SIMPACK software, the wheel-rail dynamic performance of the new radial bogie is calculated, and the interaction between the subframe and the saddle is analyzed The law of the reliability of the sub-frame connection and finite element simulation of fatigue reliability of the bench test. The results show that the new type of radial bogie can reduce the low frequency of wheel and rail by about 10.78% when subjected to the pulsed low frequency pulsed joint of 0.01rad compared with that of the K7 bogie. When the new radial bogie is excited by AAR5 dynamic line, The vertical and lateral forces can be decreased by about 2.98% ~ 4.03% and 2.96% ~ 9.77%, respectively, and the wheel and rail wear power of the vehicle can be reduced by about 5.03% ~ 29.46%. The inner rivets of the saddle are obviously stressed more than the outer rivets and the inner rivet holes The maximum value of the edge stress is about 180.76MPa, the shear stress of the rivet is 58.13MPa, which is less than the allowable stress of the corresponding material 345,128MPa, which has sufficient fatigue strength and reliability.