论文部分内容阅读
为提高网系统的日常安全管理水平,实现系统重要节点的重点监管,以基本Petri网系统为对象,提出考虑相继故障的节点重要性评价方法。先将变迁间的关联结构关系划分为串联顺序、选择关联和非关联3种,并给出相应的形式化判别方法和变迁节点失效传递规则。在此基础上,建立基本Petri网系统中变迁节点的全局重要性评价指标及算法。最后以高速铁路中临时限速实施过程为算例,进行方法验证。结果表明:所建立的Petri网节点重要性评价方法能够体现网络系统的相继故障特性,并且能够解决节点删除法造成的网络不连通性问题。
In order to improve the daily safety management level of the network system and realize the key supervision of the system important nodes, this paper proposes the method of evaluating the importance of nodes considering the sequential failure based on the basic Petri net system. First, the relationship between the transitional changes in the relationship between the series is divided into series, the choice of association and non-associated three, and gives the corresponding formalized discriminant and failure node transfer rules. On this basis, establish the global importance evaluation index and algorithm of transition nodes in the basic Petri net system. Finally, the speed-limited implementation of high speed railway is taken as an example to verify the method. The results show that the established importance evaluation method for Petri nets can reflect the sequential failure characteristics of the network system and can solve the problem of network connectivity caused by the node deletion method.