| With the rapid development of social economy and constantly With the rapid development of social economy and constantly speeding up of urbanization process, urban population is more and more concentrated. Urban vehicles continue to increase and the demand for urban traffic increases sharply. Those consequently result in the trouble of traffic jam, which has become an overall situation problem that affects the normal function and sustainable development of cities. The city p- transportation hub is the infrastructure which in the city the many kinds of transportation way links up, has the management and the organization passenger flow, center transforms while with the assistance service and so on many functions, is playing the crucial role in the entire municipal transportation. Presently, various cities p- transportation hub mostly has the design which is not reasonable, the facility not necessary, the facility layout unreasonable, the transportation organization uncoordinated and some other questions, which caused the key position trading not to be high while the efficiency, affects the entire municipal transportation fast to be unobstructed, often became the municipal transportation the bottleneck.How does the synthesis passenger transportation hub overall transportation potency, in the hub itself structure and the function flaw as well as the hub each transportation way links up the efficiency and the coordination carries on the appraisal and the analysis, thus can assist synthesizes the passenger transportation hub system the design and the optimization, strengthens the hub resources the use factor, enhances the hub the transportation to trade while the efficiency, became the key that improved the hub transportation. Using the city passenger transportation hub transportation simulation platform, may dynamically and clearly observe each kind of transportation phenomenon in the hub, thoroughly analyze the transportation characteristic of the transportation flows and the hub static state facility use situation which is in the hub, effectively in the hub design, the hub the facility layout and the hub transportation organization plans carries on the appraisal, discovers the hub's bottleneck, analyzes the reason that caused the bottleneck, carries on the experiment and the analysis to each kind of optimized plan, is advantageous to carries on the research about transportation plan, transportation organization and management. Through the simulation method, may avoid some expensive and also the cycle long traffic survey and the field test, obtains the data by the very small price which investigates with difficulty, and the reappearance many kinds of transportation phenomenon, is a effective method that studies the municipal transportation.The hub transportation simulation system has many merits. It does not need the participation of real systems and it also has the economical convenience the merit, specially was suitable for the research about design proposal and transportation behavior which still does not exist or being in the plan. It can clearly understand which variables of the transportation flow are important, as well as how do they are mutually affect. It can also effectively study in the hub transportation system certain dangerous situations or the disaster consequence, like fire evacuation and so on. At the same time, it can duplicate provides the similar transportation environment, may carry on the fair evaluation to the different plan design proposal and unceasingly change the system movement condition, thus may forecast the transportation system in each kind of situation behavior.It can change transportation demand along with time and space, thus can make the forecast for the hub transportation stops. When other traffic analysis technologies are not suitable, the transportation simulation system often can effectively solve the problem. Through this analysis, the appraisal and the experiment that the transportation simulation system makes to the city passenger transportation hub may make the appraisal to the hub design and help to propose optimized plans and carries on evaluation to them, thus enhances the transportation trades while the efficiency of the hub. The traditional method of transportation plan and the control system applied mathematics analysis method. This has not been able to adapt the modern transportation demand in solving complex system like the municipal transportation system aspect. Compares with mathematics analytic method, the method with the simulation analysis may carefully describe the difference between each transportation entity, reappears entire process of the hub transportation, is advantageous for studies the dynamic performance of complex system from the time and the spatial two angles simultaneously. The technique of simulation has powerful life and latent ability because of its high efficiency, high quality and low cost.The integrated passenger hub function and structure of numerical experiments systems are microscopic simulations to the hub interior transportation behavior, altogether divides into four functions modules. The modeling system primary answers for establishing simulation model and it is a most alternately module with users. The user needs to establish the simulation scene of the hub, establish logic object and link them to become the way, input and set parameters finally to form a complete model no wrong document. Simulation system is mainly responsible for the simulation and related control. The user opens the model document then can start to simulate. Simulation system can generate a simulation final outcome document which record all the relevant data of the entire simulation process. Analysis and experimental system is mainly responsible for the analysis and the results output in a variety of ways, and different options can be compared. Users can open the simulation result document for analysis also can open the model document simulating and analyze at the same time.3D simulation system is mainly responsible for the hub 3-D simulation results demonstrate, which simulation data are from the simulation result document of simulation system or model document of the modeling system.The integrated passenger hub function and structure of numerical experiments systems are primarily used of several key technologies in the achievement. The hub scene establishment used data of DXF, 3DS document conversion technology. The user inducts the hub design document which is in the DXF form through the modeling system. After reads and transforms its data the system redraw them up on the screen. Then the user carries on the suitable modifying to form the simulation scene of the hub. The user inducts the hub design document which is in the 3DS form through the 3D simulation system, then reads its data and carry on redrawing them. After the suitable revision they becomes the hub's 3D simulation scene. Such procedure obviously is simpler and more accurate than the users draw up the hub scene himself.In the system all of the logical objects drawing and edition, the scene drawing and the edition, the animation production used the OpenGL technology. Carries on the graph plan with OpenGL quite conveniently, moreover draws up the graph vivid, lifelike and has a better interactive performance. It to the animation the handling ability also is most outstanding. To simulate the pedestrian,the multi-agent technology has been used. The multi-agent technology application enables the pedestrian in the simulation system have the certain ponder capacity, even more approaches the reality, can manifest under the real transportation environment pedestrian's behavior characteristic, causes the simulation effect of the entire simulation system more lifelike and accurate, as the platform that appraises and tests the transportation hub its function to be able fully to manifest.This article proposed the design of the system mentality, drew system detailed functional diagram and the use case graph, has built a procedure frame, finally has realized a simulation under a simple hub scene. In the simulation system transportation entities are pedestrians which have simple intelligence, can defer to own way complete own transportation behavior and can hide shuts the barrier and other pedestrians in the active period.The integrated passenger hub function and structure of numerical experiments systems are function formidable platforms for transportation hub's simulation, analysis and test. Its research and the development to improve the municipal transportation, display the city function have the important practical significance and big economic value. To achieve the goal which the system namely decides, we must spend a lot of time and the energy consummates its each function. But the research of the multi-agent will be the future work key point, because the multi-agent performance quality will be the system simulation effect directly manifests, also will be this system most important innovation breakthrough point. |
