中低速磁浮平竖曲线重合段动力学特性及线路参数研究OA

When faced with complex terrain conditions,medium-low speed maglev lines often require the overlapping construction of horizontal and vertical curve sections,but the impact of such overlapping curve sections on vehicle dynamic performance remains unclear.Based on the design method of maglev traffic lines and combined with the characteristics of overlapping curve sections,vehicle-track dynamic models considering the conditions of vertical-circular curve overlap(overlap of vertical curves and circular curves)and vertical-transition curve overlap(overlap of vertical curves and transition curves)were established respectively.On the basis of relevant standards,the dynamic vibration characteristics of maglev trains during suspension operation when passing through different overlapping curve sections were studied.The influences of line parameters such as circular curve radius,transition curve length,and vertical curve radius on the system's dynamic response were analyzed.Moreover,the design of line parameters for overlapping curve sections was carried out.The matching relationships between line parameters under different speed levels were quantified,and their recommended values were provided.The research results show that the dynamic response of the vehicle when passing through the vertical-transition curve overlap section is more significant compared with the vertical-circular curve overlap condition.The smaller the circular curve radius,the shorter the transition curve,or the smaller the vertical curve radius,the more intense the dynamic response of the vehicle when passing through the overlapping curve section.When a circular curve with a radius of 150 m overlaps with a vertical curve with a radius of 2 500 m,the safe passing speed of the vehicle is 42 km/h.If the vertical curve radius is reduced to 1 250 m,the vehicle's passing speed must be limited to below 30 km/h.In the vertical-transition curve overlap section with a vertical curve radius of 2 500 m and a transition curve length of 60 m,the safe passing speed of the vehicle is 34 km/h.When the transition curve length is shortened to 42 m,the vehicle's passing speed must be further reduced to within 30 km/h.The research results can provide reference and guidance for the parameter design of horizontal and vertical curve overlap in medium-low speed maglev lines.