基于复杂度算法的安全指标分配分析

Safety Target Assignment Analysis Method Based on Complexity Algorithm

摘要:

城市轨道交通信号工程建设过程中，信号设备供应商需要将业主设定的总体运营安全指标分配给信号系统的各个子系统。首先分析城市轨道交通信号系统的体系架构、安全功能和安全指标，然后针对设计的三种安全指标分配方法，分析这些方法的具体要求和原则，结合系统架构、安全逻辑模型和具体工程建设参数，利用三种不同方法，将整个系统总体安全指标分配到各个设备，最后比较不同分配方法计算出的分配结果。从分配结果的比较来看，三种分配方法得出的结果均处于同一数量级，均为可行的分配方法，但从系统安全性的角度而言，基于系统复杂度的分配方法最优，更适合信号系统设计和制造的需求。

Abstract:

In the urban rail signalling engineering project， signalling equipment suppliers need to allocate the overall operation safety target set by the owner to each subsystem of signalling system. At first， the system architecture， safety function， and safety target of the signalling system was analyzed. Then， the specific requirements and principles of the three designed safety target allocation methods were discussed. Considering the system architecture， safety control logic， and specific engineering construction parameters， three different allocation methods were used to allocate the overall system safety target to each subsystem. Finally， the allocation results calculated via the three different allocation methods were compared. The results obtained from the three allocation methods are in the same order of magnitude， which are all feasible. However， from the perspective of system safety， the allocation method based on system complexity is the preferable one， which is more suitable for urban rail system design and manufacturing.