高速公路交通系統(tǒng)脆性激發(fā)評估研究
[Abstract]:In recent years, due to traffic emergencies caused by highway congestion or even serial accidents, cascading failure reports are common. The large scale failure caused by cascade failure of expressway system has great influence on regional travelers. Brittleness theory as a new direction of complex systems, its basic theory can well accord with the characteristics of highway system. Therefore, it is necessary to study the brittleness of expressway. Based on the theory of brittleness, the paper studies the essence of brittleness of expressway traffic system and its exciting condition, and probes into the ability of expressway system to cope with unexpected events. This paper first studies the feasibility of the application of brittleness theory in expressway system. By analyzing the internal and external environment of complex system, this paper explores the basic characteristics of expressway traffic system brittleness. Furthermore, the essential causes of brittleness and the conditions under which the brittleness of the system is excited are analyzed. The system is disturbed by the internal and external environment, that is, the brittleness factor, which leads to the system brittleness, which is the objective external cause of the system brittleness being excited. There are a variety of factors affecting system brittleness, such as bad weather conditions, road quality conditions and road closure caused by traffic accidents. In this paper, the identification model of system brittleness factor is established based on Dematel method, and the brittleness factor of expressway traffic system is identified and analyzed. The prerequisite of system brittleness excitation is that the brittleness source is disturbed by internal and external environment and the essential reason of system brittleness excitation is that the system achieves self-organizing critical state. It is necessary to study the brittleness of expressway traffic system by judging the critical state. Under the condition that the system is disturbed by the main brittleness factor, Vissim software is used to explore the critical state of the brittleness excited by the sub-system unit, that is, the critical capacity of the brittleness source under the influence of the brittleness factor. The failure caused by the disturbance of the system brittleness source is the precondition for the system brittleness to be excited, so it is very important for the evaluation and analysis of the system brittleness source. Based on the idea of cascade failure method, this paper puts forward the evaluation index and method of brittle source of expressway traffic system, and takes Heilongjiang Provincial Highway Network as an example to evaluate the brittle source.
【學位授予單位】:哈爾濱工業(yè)大學
【學位級別】:碩士
【學位授予年份】:2014
【分類號】:U491
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