Safety Analysis Of Fully Automatic Operation System Of Rail Transit Based On STAMP

Train operation control system is the key to ensure the safety operation of the rail transit and improve the efficiency of the operation. Currently, along with the development of application of science and technology, modern computer, communication, control technology based FAO (fully automatic operation) system, with its high degree of automation, could improve operational efficiency and reduce operating costs and other characteristics, have gradually become the mainstream of the development trend in the domestic and foreign urban rail transit. The application of a large number of computer software and the interaction in the system make the train control system become more complex, and put forward a great challenge for the traditional safety analysis methods.In this thesis, after reading and understanding on the basis of a lot of literature research, study on the character of safety analysis theory and traditional methods, point out the deficiency of various methods. Combining domestic and foreign automatic operation system operating and research data, functional structure and operational scenarios of the system are discussed, so as to conduct a comprehensive study for fully automatic operation system. Based on the above analysis results, this thesis discusses the limitations of the traditional safety analysis method applied to the fully automatic operation system design, and further clarifies the purpose and significance of the research.This thesis discuss on the superiority of STPA(System-theory process analysis) from the system theory and control theory point of view, formulate safety analysis framework of STPA and operation scenarios for three stages of the overall process: Basic data collection and analysis, construct the process model graph of the control function; build hierarchical control structure diagram of operation scenarios, recognition inadequate control in combination with the scenario and modify control function process model graph; identify casual factors. On this basis, the design a STPA based safety analysis platform for automatic operation system, to provide a supporting tool for the STPA analysis method.In this thesis, using the train control system safety analysis method based on STPA combined with operation scenario, according to the typical system-level hazards of automatic operation system, select the scenario of train pulled into and out of station to establish the appropriate hierarchical control structure model, analysis the causal factors of hazard and safety constraints, and design actionable safety requirement or protective measures combined with the actual project. Finally, improve the system design of fully automatic driving system, guarantee the safe operation of the systems.