研究结论：以LMA型踏面动车组直向通过设计时速350 km 18号道岔为例进行分析,得出：（1)降低尖轨起始承载断面顶面降低值对提高车体的横向加速度是有利的；（2)减小尖轨起始承载的断面对提高车体的横向稳定性也是有利的；（3)轮载转移点越靠后，道岔的横向及竖向不平顺明显增加，尖轨顶面纵坡虽有所减小,但对车体的横向平稳性极为不利；（4)动力学参数设计法在方案比选中是合理的和可行的。
Abstract：Research purposes : Based on the research on the change regulation of the wheel load of the turnout switch in the transition zone， the design indexes and structure irregularity indexes were given out according to the actual production，then design method was presented for the dynamic parameters for the turnout，and the computation program for the geometric relation of static contact between the wheel and rail in the turn out zone was worked out to make the fast and optimal design of the wheel load transition zone of the turnout switch.
Research conclusions: The analysis of the EMU with LMA type tread straightly passing the Turnout 18 At the speed of 350km/h was made with the design method for the dynamic parameters for the turnout and the computation program for the geometric relation of static contact between the wheel and rail in the turnout zone presented in this paper. The analysis result showed the reduction of the top surface value of the initial bearing section of the switch rail was beneficial to increasing of the transverse acceleration of the train body. The more back the transfer point of the wheel load stayed at，the more obviously the transverse and lateral regularities of the turnout increased. Although the longitudinal gradient of the top surface of the switch rail decreased，but it was harmful to the transverse stability of the train body. The optimal design scheme was presented for the relation between the wheel and rail when the train passing the Turnout 18 at the speed of 350 km/h. The application showed this scheme was reasonable and feasible in the design of dynamic parameters.
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2013, Vol. 30 
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