Research On Emergency Transportation Organization Command System Key Technology

In recent years, some significant disasters frequently appear in the world, such as 2004 tsunami and earthquake in Indonesia,2005 "Katrina" hurricane disaster in USA,2008 Wenchuan earthquake and the sleet froze disaster in southern China,2011 Miyagi earthquake and tsunami as well as Fukushima nuclear crisis. All of these have posed a severe test on the global emergency disaster relief system. In a major disaster situation, a complete and reliable road traffic system is needed for the emergency relief, but the disasters normally destroy the system and even make it paralyzed and not able to meet the relief needs. Therefore, ensuring the safety and smoothness of the road traffic is an important prerequisite for disaster relief. The emergency capacity of the road traffic system is often directly related to the key to emergency relief. Establishing a rapid and effective emergency transport plan, you can respond quickly to disasters in time, which significantly reduces life and property losses, reducing the disaster losses to a minimum.The technical achievements in evacuation and rescue, which are currently widely used in the emergency transport organization and command system, are difficult to meet the demand of handling the present major disaster events. Therefore, governments around the world are trying actively to enhance the development of emergency capacity of their transport systems. Under such background, the Ministry of Science and Technology of China has set up the "863 plan" for special issue-traffic organization security technology for major disaster conditions, which is led by Jilin University, cooperated with Wuhan University, the Ministry of Science Research Institute and Dezhou Highway Survey and Design Institute. This paper depends on the projects above, and develops research and discussion with the key technology emergency transport organization and command system for major disaster conditions as the research object. The whole text is divided into five chapters, the first chapter includes the research background, significance and thought analysis, and chapter 5 is about the summary and prospect. Chapter 2,3 & 4 are key sections, including emergency transport organization and command system framework design, emergency vehicle evacuation route optimization technique and emergency induced intersection traffic signal timing priority technique. Specific contents are as follows:1) Emergency transportation organization and command system framework design;This paper introduces the physical framework and logical framework of the emergency transport organization and command system in Chapter2. The work flow of the system is made clear through the physical framework, and each key technology module is introduced through the logical frame. The key technology that can enhance emergency capability is emphatically summarized in the studied system.2) Emergency vehicle evacuation induction path optimization technique;Chapter 3 of the paper analyzes the research status and application of the route guidance path optimization techniques and algorithms at present, and summarizes the future development tendency. Regarding the mutability of road network impedance under major disaster conditions, the paper introduces the sections instantaneous impedance to establish an optimum dynamic traffic distribution model for quasi user. And based on the delete algorithm, K, the fastest method for solving short circuit, is designed. Finally, the simulation of the evacuation process through VISSIM proves that the evacuation process model and the algorithm can effectively improve the evacuation effect, which has practical promotional value.3) Emergency induced intersection traffic signal timing priority technique;Chapter4 introduces several forms of signal control optimization in the first place, including single point signal control optimization, route control optimization and regional control optimization. This chapter proposes the intersection signal priority method based on GPS information, and analyzes the principle and the practical significance of the method. Then it briefly introduces some commonly used signal priority strategies, and develops discussions with the actual example of two phase intersection signal priority situations.This paper sets the enhancement of the emergency evacuation rescue capability under the major disaster conditions as the goal, and takes the emergency traffic demand system under the major disaster conditions as the research object. The two key technologies, the emergency traffic induction path optimization and the emergency intersection signal priority, are deeply studied, and their application effect and practical operability are proved significant through simulations. If the results of this paper can be integrated into the emergency management system of big cities, it can significantly improve emergency rescue capability of the system, and reduce the time of evacuation rescue, thereby lower the cost of disasters.