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中文摘要：
针对A-1-A轴式架悬动车运用条件发生的变化，为了设置合理的中间车轴轴承的横向自由间隙（即中轴自由横动量），采用多刚体动力学软件SIMPACK建立了动车动力学模型，比较中轴自由横动量对动车非线性稳定性、直线运行横向性能、曲线通过性能和曲线外轮磨耗功的影响。研究表明：当动车运行线路以曲线半径200-300m的小半径曲线为主时，为了改善曲线通过性能和降低轮轨横向力，中轴自由横动量应在10～14mm;当动车运行线路以曲线半径500~800m的曲线为主时，为了均衡第1轮对和第2轮对的磨耗，中轴自由横动量应在6～8mm。
英文摘要：
Since the application conditions of the power-car with four driving equipment mounted m the frame of six axles （i. e. A--1--A） have changed, in order to set the reasonable axial free clearances for middle axle box bearings （namely the free lateral displacement of the middle axle）, a dynamics model of the power car is established by adopting the multi-rigid-body dynamics software SIMPACK. The nonlinear stability, the lateral performances on tangent tracks, curve negotiation performance, and the wear work between outside wheel and rail on curving of the power car are compared with different middle axial free movements. The analysis indicates that when the power car runs on lines mostly with smaller curvature radius of 200-300 m, for modifying its curve negotiation performance and reducing wheel rail lateral force, the axial free movements of the middle axles should be 10-14 mm. When it moves on lines with smaller radius of 500-800 m, in order to balance the wear of first and the middle wheelsets, the free lateral displacement of the middle axle should be 6~8 mm.
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