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http://dx.doi.org/10.5762/KAIS.2018.19.11.574

Evaluation and Determination of System Design Alternatives Utilizing a SysML-Based M&S Method for Achieving Functional Safety  

Jung, Ho-Jeon (Dept. of Systems Engineering, Ajou University)
Lee, Jae-Chon (Dept. of Systems Engineering, Ajou University)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.19, no.11, 2018 , pp. 574-582 More about this Journal
Abstract
In systems such as railways, automobiles, and airplanes, system malfunctions may lead to accidents, which often cause serious personal injury and economic loss. In previous studies, failure analysis has been performed, and safety measures derived using the component level information to reduce damage when a failure occurs. However, in functional safety concept, a focus is placed on lowering the frequency of occurrence of failures by performing risks analysis, setting up safety goals, and designing safety functions. Therefore, it is necessary to study how to determine the required safety function that can reduce the failure frequency to the acceptable level. To achieve this, we first studied a failure modeling method using SysML. It was then presented how several alternatives can be assessed to determine the desired safety function by simulating the generated SysML failure models and calculating the ability to reduce the failure frequency. A case study of a railway signaling system was done, demonstrating the effectiveness of the approach. We assessed whether the safety objectives were met for the alternative design of the railway signaling system through M & S. The results can be useful in that it can be applied from the early design phase and allow to choose the appropriate safety function that satisfies safety objectives among various design alternatives.
Keywords
Design Alternative Evaluation; Railway Signaling System; Safety Analysis; Safety Design; SysML based M&S;
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