Research Papers

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,
Central Tehran Branch,
Islamic Azad University,
Tehran 19978-55992, Iran
e-mail: sha.oveisiarangeh.eng@iauctb.ac.ir

Reza Ravanmehr

Department of Computer Engineering,
Central Tehran Branch,
Islamic Azad University,
Tehran 19978-55992, Iran
e-mail: r.ravanmehr@iauctb.ac.ir

1Corresponding author.

Contributed by the Computers and Information Division of ASME for publication in the JOURNAL OF COMPUTING AND INFORMATION SCIENCE IN ENGINEERING. Manuscript received April 22, 2017; final manuscript received June 23, 2017; published online July 26, 2017. Editor: Bahram Ravani.

J. Comput. Inf. Sci. Eng 17(3), 031018 (Jul 26, 2017) (11 pages) Paper No: JCISE-17-1083; 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, as well as interactions among these components in cyber-physical systems (CPS). The risks in CPS 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 CPS. In this paper, after reviewing the major techniques of software reliability and safety in CPS, an software fault tree analysis (SFTA)-based approach is presented for analysis of operational use-cases (UC) in a CPS system. In our approach, the events related to use-cases are extracted, and the related SFTA is then obtained using the proposed algorithm. Moreover, a semi-automatic method is presented in this paper to produce software failure mode and effects analysis (SFMEA) from SFTA. The results of our approach are applicable for software safety analysis in a real CPS system, including the control system of Iranian National Observatory telescope. Assessment of the suggested method is performed through numerous safety/reliability criteria and the qualitative/quantitative analysis based on these criteria.

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Fig. 1

From fault to mishap

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Fig. 2

Safety engineering methods in risk management

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Fig. 3

Workflow of the proposed approach

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Fig. 4

The preconditions, main and alternative flows

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Fig. 5

Fault tree obtained from UC-SFTA

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Fig. 7

Schematics of producing SFMEA from SFTA

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Fig. 8

SFMEA breakdown process

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Fig. 9

Architecture of INOCS

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Fig. 10

Use-case diagram of evaluate visibility

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Fig. 11

SFTA of evaluate visibility

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Fig. 12

The cut set and minimum cut set for SFTA of evaluate visibility

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Fig. 13

Failure rate of the two basic events of evaluate visibility

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Fig. 14

The reliability analysis results for different parameters (before and after SFMEA)




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