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新型货车径向转向架低动力性能与连接可靠性

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Keywords: 车辆工程,货车,副构架,径向转向架,低动力作用,车辆-轨道耦合动力学,连接可靠性

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Abstract:

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。

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