- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
- Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
- Chinese S&T Journal Citation Reports
- Chinese Science Citation Database
| Citation: | LI Yao, ZHANG Xiaoxia, GUO Jin, ZHANG Yadong. Testing Modeling Method for Safety Critical Function of High-Speed Railway Signal System[J]. Journal of Southwest Jiaotong University, 2022, 57(1): 28-35, 45. doi: 10.3969/j.issn.0258-2724.20200378
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Testing model is an important basis to create the test cases of safety critical function of high-speed railway signal system. To solve the problem that the characteristics of signal system are not fully represented in the modeling process of safety critical function test of high-speed railway signal system, the modeling theory of timed finite state machine (TFSM) and test case generation method are proposed. The characteristics in the test modeling of high-speed railway signal system is analyzed, and the modeling requirements are put forward. Then, based on the theory of finite state machine, a modeling method of TFSM is proposed by utilizing functional logic and clock constraints, and its formal definition is established with Z notation. Further, the TFSM is transformed into timed automata, which can prove the consistency between them, and test cases are automatically generated with timed automata based testing theory. The switch conversion function of the computer interlocking system is used as an example to build the testing model of TFSM and generate the test cases. The result shows that compared with the test cases generated by timed automata, in terms of functional logic, the test cases generated by TFSM can fully cover those generated by timed automata, and add 16 more test cases with clock constraints, showing that TFSM can meet the testing modeling requirements for the safety critical function of high-speed railway signal system.
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