The Influence Of The Guideway Deformation Due To Effect Of Temperature On The Stability Of Maglev Vehicle

Compared to the traditional bus,subway,rail transit,the maglev line,because having a lot of advantages such as small turning radius,high climbing ability and low cost,will be widely used in urban public transport and tourism.In the maglev line construction,the track beam is one of the key components,and machining accuracy is similar to the machine parts,deformation must be control very strictly,these result in high cost,accounting for the entire foundation cost of 60?80%.Guideway deformation,influenced by many factors,especially temperature,direct impact on the ride and comfort of maglev train.View of the current design of maglev railway guideway mostly reference the ballastless track design theory of high-speed railway and high-speed maglev line is not suitable for existing high-speed maglev line design,and few scholars to study.Therefore,this paper sufficient extensive research,theoretical analysis,numerical simulation to determine the type of guideway structural,based on which analyze the characteristics of the guideway deformation under the influence of temperature field,based on this,obtain the rail surface irregularity,and the establishment of the use of maglev vehicle-track-track vertical coupling beam model,more detailed analysis of the guideway structure combined loads and temperature load under5the combined effect of the smooth operation of the vehicle,obtained results are as follows:(1)According to the external environment of guideway,established the finite element transient heat conduction of heat conduction equation,the boundary conditions of the beam orbit equation and track beam model of track beam temperature field,through numerical calculation,solving the transient temperature field in the track beam distribution,and verify the validity of model test;(2)According to the temperature gradient load combination,analysis temperature gradient loading track beam deformation characteristics,and the calculation results and the experimental results are compared.The experimental results show that the two difference is less than 15%,the calculated results credible,verification of the FEM calculation results of the effectiveness;(3)According to the theory of the electromagnetic force,established a maglev vehicle-track structure-coupled spatiotemporal roadbed model;(4)The use of the vehicle-track structure-coupled spatiotemporal roadbed guideway calculation model and vertical deformation curve under the influence of temperature,obtained acceleration response,maglev changes in the value of the gap,in the vertical deflection limits of guideway,magnetic gap in between 6 and 11 millimeter,therefore,to ensure the smooth running of the maglev vehicle.The results of this study for the design and optimization of the engineering applications of high-speed maglev guideway structural and provides a theoretical basis for reference.