超导电动悬浮交通道岔平面曲线参数设计研究OA

[Objective]Superconducting electrodynamic suspension(EDS)transit uses a trough-shaped guideway,and its broken-line turnout design method approximates curves using multiple straight guideway beams.Therefore,it is necessary to analyze the curve alignment,turnout parameters,and segmental fitting patterns and conduct theoretical research on the alignment and parameter design of broken-line turnouts for superconducting EDS transit.[Methods]Single circular curves and clothoid-type transition-circular-transition curves were used to design the horizontal alignments of broken-line turnouts for superconducting EDS transit at different speed levels.The requirements for alignment design imposed by vehicle-guideway geometric constraints and ride comfort indicators were analyzed.The relationships of single-span length,turnout-beam deflection angle,turnout-zone length,and fitted circular-curve radius with the number of spans and circular-to-transition curve length ratio were discussed.Alignment diagrams of broken-line turnouts suitable for medium-low-speed and high-speed operation were presented.[Results]The results indicated that for 100 km/h-class turnouts with a permissible diverging speed,when a single circular curve was fitted,the single-span length and turnout-beam deflection angle decreased as the number of spans increased,and their rates of decrease slowed beyond eight spans.The turnout-zone length and circular-curve radius first decreased and then increased.When the transition-circular-transition curve was fitted for a 200 km/h-class turnout,the single-span length and total turnout-zone deflection angle decreased as the circular-to-transition curve length ratio increased.When the ratio was less than 2,the single-span length decreased rapidly,the total turnout-zone deflection angle decreased in a wave-like pattern,and the total turnout-zone length and circular-curve radius gradually increased.[Conclusion]It is concluded that an eight-span fit to a single circular curve is recommended for 100 km/h-class medium-low-speed turnouts,with a single-span length of 9 m,a turnout-zone deflection angle of 5.699 5°,and a fitted circular-curve radius of 724 m.If higher ride comfort is required,a transition-circular-transition curve with a small circular-to-transition curve length ratio can also be used.For 200 km/h-class main-line switching turnouts,a transition-circular-transition curve turnout with a small circular-to-transition curve length ratio and a relatively small circular-curve radius is recommended.At a circular-to-transition curve length ratio of 2,the single-span length is 19.8 m,the turnout-zone deflection angle is 3.001 2°,and the fitted circular-curve radius is 2 268 m.If higher operational safety and ride comfort are required,the circular-curve radius can be appropriately increased to reduce lateral impact at the turnout-beam joints.