Safety Target Assignment Analysis Method Based on Complexity Algorithm

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.