二乘二取二系统的可靠性和安全性-计算机应用技术专业论文.docx

Reliability and Safety of Double 2-vote-2 Redundancy System ABSTRACT As the rapid development of railway in China, new technology such as high-speed railway and electric multiple units have been put into applications, which largely increase the amount of railway signal transmission and raise higher demands t o reliability and safety of railway signal equipment. Computer interlocking system, the core part of railway signal equipment, controls signal lights, turnouts and track circuit to realize the interlocking relationship between them. To ensure the reliability and safety, double two-vote-two redundancy structure is widely adopted in the computer interlocking system of China. European standard s eries EN50126 has been internationally recognized as the authoritative standard in the field of railway signaling equipment, and the advanced reliability and safety theory and technology in it gradually begin to be received by the domestic research institutes and equipment manufacturers . Hefei Gocom Information Technology Co. Ltd closely follows the standard series EN50126, designs and develops computer interlocking system which meets Safety Integrity Level (SIL) 4. In the thesis, main research is focused on the followings: According to standard series EN50126, thesis designs and develops computer interlocking system which meets SIL4 from the full range aspects of system composition, such as system components, regional interlock function, redundant structural design, safety principle of 2-vote-2, cabinet layout and electronic interface module. Based on hardware circui t FMEDA analysis, the failure rate and nondiagnostic dangerous failure rate of single board are calculated. Thesis analyzed the reliability and safety of double two -vote-two redundancy structure by Markov process which considered comparator and switch module failures. Compared with each element of failure, thesis made the conclusion that the failures of computing and switch module have a greater i