Research And Implementation Of Comprehensive Transpotration Safety And Scheduling Simulation System

With the rapid development of economy, China’s urban transportation development isalso growing, but following the traffic pressure will increase gradually. Our country developsthe integrated transport in big cities to actively promote the comprehensive transportationconstruction and expansion.. To alleviate the traffic pressure and achieve the pedestrian“seamless transfer”, many comprehensive transportation centers have been established insome big cites, such as Beijing, Shanghai, Guangzhou etc. But the comprehensivetransportation of Western region is not sound enough in safety and scheduling security system.It is lack of effective assessment tools in coordinating operations and security program. So,how to speed up the construction of transportation infrastructure is an effective measures topromote the opening up and in of Western region. It is an inevitable choice to achieve theeconomic and social development of the Western region and enhance the breadth and depth ofthe opening.Base on this insight, the paper researches on the comprehensive transportation safety andscheduling simulation system. And a set of simulation software was developed based on theresearch. The system is mainly divided into two functional modules of the facilities modelingand scheduling simulation. The simulation scenario is a plane drawing of the passengerhub. So, in modeling, at first we have to read the AutoCAD drawings of integrated passengertransport hub as a simulation scene and then model for the comprehensive transportationcenter including a model of logical facilities and an suite facilities by using technology ofOpenGL, object-oriented (Object-Oriented, OO) programming methods and knowledge ofcomputer graphics. The information of established model and drawing are stored in thedatabase, so the paper make the introduction of the stored date including the way of storageand the structure of the table. The system also provides the function of model checking. It istesting the correctness of the model from the following four aspects, like ratio, floor, loop andexport.In this system, in order to complete the simulation of pedestrians in the comprehensivetransportation center, we need to plan path for the pedestrian. And the path must bypass theobstruction, such as walls, pillars, and the logical facilities of modeling. Then we can analyzethe capacity and bottleneck of the shortest path according to the lowliness algorithms. For thereason that the modeling for pedestrian shortest path search is difficult, this paper improvesand optimizes the path planning algorithm relying on research achievement of previous project. Put forward a search strategy in the continuous model which is based on visibilitygraph. It can establish a Visibility Graph and then search the shortest path for the pedestriansby using A*algorithm in this continuous model. In this new algorithm, we connected theimproved Visibility Graph algorithm and A*algorithm, it reduced the number of nodes andthen reduced the selecting of the path complexity automatically and expand the number ofnodes in the continuous model. Further, in order to validate the feasibility and efficiency ofthe improved algorithm, the paper make this improved algorithm applied to the pedestrianobject path search navigation, it make an comparison experimental in Beijing xizhimen, andthen the result show that the improved algorithm is feasible and has a more high efficiencyand versatility.In the model of security and scheduling, the simulation system provides the function ofinterruption, and then you can simulate when you modify the model. The paper makes adetailed design and initial implementation for the safety and scheduling simulation module. Itmake an introduction and design from the flowing two aspects, first, in the interruption, itincludes people, time and parameter. Then for the models modify process, it has two ways,like manual scheduling and planning. In the system, the manual scheduling has been initiallyrealized by combined with the pedestrian modeling, path searching and so on.