Study On Horizontal Alignment Technology Of Urban Rail Transit Based On Interactive Electronic Whiteboard

With the acceleration of urbanization,the number and distance of people’s travel increase rapidly,which leads to a significant increase in traffic flow.To ease the traffic,urban rail transit construction speeds up,on the other hand,making it difficult for horizontal alignment design.In the pre-feasibility and feasibility study stage,as it is usually difficult to settle a horizontal alignment scheme,not only designers’ burden aggravates but also the project progress is affected.It is known to all that choosing a reasonable and feasible scheme requires designers’ meticulous studies on schemes with various factors,on which professional engineers’ and review experts’ carefully exanimate before approval.Nonetheless,in the course of scheme designs,designers’ ideas and inspiration often vanish as these cannot be reflected in the electronic map in real-time intuitively.Meamtime,the same goes to the expert group’s opinions on the scheme,thus they are to be proven whether feasible or not.Therefore,a platform which is capable of expressing designers’ and review experts’ ideas is particularly needed for the facilitation in quality and efficiency of research,discussion,and evaluation of horizontal alignment schemes.This thesis dissects horizontal alignment design technology of urban rail transit based on an interactive electronic whiteboard with railway horizontal alignment segmentation and fitting technology.Main research contents and results are as follows:(1)This thesis summarizes software and hardware composition and working mode of interactive whiteboard system in detail,which provides a basis for the comparison and selection of systematical interactive platform.Meanwhile,this thesis’ s studies on the related operation of SMART interactive whiteboard and AutoCAD software lays a foundation for the realization of the system.(2)Taking calculation method and constraint conditions into the consideration of urban rail transit horizontal alignment design,this thesis concludes a set of urban rail transit horizontal alignment design algorithm based on interactive electronic whiteboard.The algorithm mainly consists of alignment features and the horizontal alignment segmentation method with similar curvature,and linear and circular curve fitting algorithm with least square method.Through the algorithm,coordinates,radius and transition curve length of every intersection point can be obtained with an electronic white board spline curve,thus an urban rail transit horizontal alignment is determined.(3)This thesis develops a demonstration platform system of urban rail transit horizontal alignment design,with the algorithm of urban rail transit horizontal alignment design based on the interactive electronic whiteboard as fundamental theories,SMART Interactive Whiteboard as interactive hardware,Visual Studio2008 and AutoCAD 2010 as a development platform,C++ as a development language,and ObjectARX 2010 as a tool.The system includes drawing,the fitting and interactive function of the horizontal alignment and a visual operation interface,which improves the practicability and operability of the program.In the last part of this thesis,the feasibility of the system and the correctness of the algorithm will be verified through examples.