基于Petri网的铁路车站安全防护系统建模及可靠性分析

采用单一的随机Petri网对车站线路结构、列车运行过程及车站防护系统建模,基于欧洲电工标准委员会定义的安全目标,确定车站安全防护系统的可靠性需求。对无防护系统的列车入站进行建模和分析,然后基于防护系统功能及可靠性特性,结合列车入站动态特性,对防护系统的功能和可靠性进行建模,并根据安全目标与车站事故率之间的数学关系进行系统的安全分析和可用性分析。其结果表明,车站防护系统的可靠性与乘客的个人风险存在着定量的关系,从而可以依据个人风险的标准来确定防护系统可靠性需求。

Modeling of Railway Station Safety Protection System Based on Petri Nets and Its Reliability Analysis

The station line structure,train running process and the station protection system were modeled by using single stochastic Petri nets,and the reliability requirement for station safety protection system was determined based on the safety target of CENELEC standards. The dynamic process of train entering station without protection system was modeled and analyzed. Then,the function and reliability of the protection system was modeled with consideration on the property of its function and reliability as well as the dynamic property of train entering the station. The system safety and availability property was analyzed based on the mathematical relation between safety target and station accident rates. Simulation results show that there exist quantitative relations between the dependability of the station protection system and the passenger individual risk,therefore,the reliability requirement of the protection system can be determined according to the individual risk standard.