SFTA-based Approach for Safety/Reliability Analysis of Operational Use-Cases in Cyber-Physical Systems

[+] Author and Article Information
Shahrzad Oveisi

Department of Computer Engineering, Islamic Azad University, Central Tehran Branch, Tehran, Iran

Reza Ravanmehr

Department of Computer Engineering, Islamic Azad University, Central Tehran Branch, Tehran, Iran

1Corresponding author.

ASME doi:10.1115/1.4037228 History: Received April 22, 2017; Revised June 23, 2017


The software is often responsible for controlling the behavior of mechanical and electrical components and interactions among these components in cyber-physical systems. When events happen that are related to different aspects of control system, the software directly or indirectly affects the occurrence of these events and their potential conversion to the risks. Risks in the cyber-physical systems could result in losing tools, features, performance and even life. Therefore, safety analysis for software in these systems is a highly critical and serious issue. In general, safety and reliability approaches play a major role in a risk management process in cyber-physical systems; the most important of which include SFTA and SFMEA. In this paper, after reviewing major techniques of software reliability and safety in cyber-physical systems, an SFTA-based approach is presented for analysis of operational use-cases in a CPS system. In our approach, the events related to use-cases are extracted and then the related SFTA is obtained using the proposed algorithm. Moreover, a semi-automatic method is provided in this article to produce SFMEA from SFTA. The results of our approach are applied for software safety analysis in a real CPS system, i.e. the control system of Iranian National Observatory telescope. The assessment of suggested method is performed through numerous safety/reliability criteria and the qualitative/quantitative analysis based on these criteria.

Copyright (c) 2017 by ASME
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