【作者】 杨燕华；

【导师】 叶小岭；

【作者基本信息】 南京信息工程大学 ， 系统分析与集成， 2011， 硕士

【摘要】 天气的变化直接影响着交通。大雾、暴雨、积雪会引起交通瘫痪,增加交通事故的发生率,给人们的出行造成不便。因此,研究天气对交通的影响有着重要的意义。虚拟现实技术可以令用户有身临其境的感觉。把虚拟现实技术引入到交通研究中,研究人员就不需要到现场做反复的实验只需在虚拟交通中验证交通控制方法的可行性和合理性。也就是说用虚拟现实技术来研究感知交通可以通过占用小部分的计算机资源得到理想的结果。在此运用虚拟现实技术来研究感知交通主要是通过三维仿真的形式来模拟感知交通技术在实际中的应用,首先在控制现场采集数据,然后实现数据的处理,最后根据处理结果对虚拟交通实行优化或管制。本文主要是研究城市交通问题。由于现实的城市模型较大,所以本文选择校园模型类比城市模型,将校园中的T字型交叉路口作为城市交通中的一个点展开研究。在交叉路口以随机车辆数和随天气变化的车辆速度来模拟城市交通流,研究了晴天、雨天和雾天等不同天气条件下交叉路口信号灯的模糊控制方法。本文首先通过视景仿真工具MultiGen Creator建立了学校的模型,然后在Visual C++6.0集成开发环境下,采用Vega API、Matlab中模糊控制函数和引擎调用函数实现了场景的整合、不同天气的模拟、交通流的模拟、车与交通灯的智能模糊控制,最后通过实时漫游和实时控制时间的显示来观察和分析控制效果的好坏。结果表明在不同天气条件下传统的定时控制效果明显劣于模糊控制效果,提出的基于虚拟现实的感知交通技术研究具有一定的现实意义。更多还原

【Abstract】 The change in the weather directly affects the traffic. Thick fog, rainstorm and snow can cause traffic gridlock, increase the incidence of traffic accidents and cause inconvenience to people’s travel. Therefore researching the impact of weather on traffic has great significance.Virtual reality technology makes user feel like being in the real environment. When virtual reality technology is introduced into the traffic study, researchers will not need to do experiments repeatedly in the actual scene in order to verify that the method is feasible and reasonable, and just need to research in the virtual environment. It means that the use of virtual reality technology can take a small portion of resources to get the desired results. Using virtual reality to research the perception transportation is mainly to simulate the practical application of the perception transportation technology by the three-dimensional simulation, which firstly collects data in the control site, and then processes data, finally uses them to optimize or control the virtual traffic.This article mainly studies the urban traffic problems. The actual city model is too large, so in this article the campus model is selected to analogize the whole city model. The T crossroad of campus is taken as a single research point of the urban traffic to research. In the intersection, a random number of vehicles and the vehicle-speed under the different weather conditions can be used to simulate the urban traffic flow. Under the different weather conditions, including sunny day, rain, fog and so on, the fuzzy control method of the intersection signal light can be researched.This article establishes school model with visual simulation tools Multigen Creator. And then in the integrated development environment of Visual C++ 6.0, Vega API, Matlab fuzzy control functions and engine functions are used to realize the integration of the scene, the simulation of different weather and traffic flow, the fuzzy control of vehicles and traffic lights. Finally the control effect is observed and analyzed through the real-time roaming and the real control time display. The simulating results indicate that under the different weather conditions the fuzzy control effect is better than the conventional time-fixed mode, which proves that the research of perception transportation technology based on virtual reality is practical and significant.更多还原