Low track force dynamic performance and connection reliability of new type radial bogie for freight car
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摘要: 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0.01 rad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180.76 MPa, 铆钉剪切应力为58.13 MPa, 均小于相应材料的许用应力345、128 MPa, 具有足够的疲劳强度和运用可靠性。Abstract: In order to realize wheel-rail low track force performance of bogie for heavy haul feight car, a new low track force radial bogie configuration was given based on the heavy haul transportation state of Chinese railway and the running experience of ZK7 type radial bogie.The improvement focused on sub-frame structure: comparing to the holistic prototype, each axle-box had an independent adapter mounted on sub-frame by tow rivets.The vehicle-track coupling dynamics model with C70EF type gondola and standard Chinese track parameters was established through the multi-body system dynamics software SIMPACK.The wheel-rail dynamics behaviour and the force law between sub-frame and adapter were discussed.The FEM simulation and fatigue test for sub-frame connection reliability were carried out.Analysis result indicates that, compared to ZK7 type bogie, when the new radial bogie passes through a 0.01 rad sinking track joint, the wheel-rail low frequency force approximately reduces by 10.78%;when it runs on AAR5 irregular track, the wheel-rail vertical and lateral forces respectively reduce by about 2.98%-4.03%, 2.96%-9.77%, and the vehicle wheel-rail wear friction power reduces by about 5.03%-29.46%.The stress of adapter connection rivet inside is obviously bigger than the one outside, where the maximum shear stress is about 58.13 MPa.The maximum stress near rivet orifice is about 180.76MPa.Both of them are less than the material allowable values 128 MPa and 345MPa respectively.The connection fatigue strength and running reliability are sufficient.
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