Abstract
In this study, we proposed a method to improve the safety level of control software (CSW) by managing the CSW’s design information and safety analysis results, and combining failure mode and effects analysis (FMEA) and fault tree analysis (FTA). Here, the CSW is developed using structured analysis and design methodology. In the upper stage of the CSW’s development process, as the input of the preliminary design information (data flow diagrams (DFDs) and control flow diagrams (CFDs)), the causes of undesirable events of the CSW are clarified by FMEA, and the countermeasures are reflected in the preliminary design information. In the lower stage of the CSW’s development process, as the inputs of the detailed design information (DFDs and CFDs in the lower level) and programs, the causes of the specific undesirable event are clarified by FTA, and the countermeasures are reflected in the detailed design specifications and programs. The processes are repeated until the impact of undesirable events become the acceptable safety level. By applying the proposed method to the CSW installed into a communication control equipment on the space system, we clarified several undesirable events and adopted adequate countermeasures. Consequently, a safer CSW is developed by applying the proposed method.
Highlights
This subsection describes the results of the safety analysis to control software (CSW) of the communication control equipment
This paper proposes a method that develops a safer CSW and a safety analysis environment by managing the CSW’s design information and safety analysis results unitarily and cooperating with multiple safety analysis methods (FMEA and fault tree analysis (FTA))
The proposed method and the environment were applied to the development and safety analysis of the communication CSW installed into control equipment on the space system
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. We propose a method for developing safer CSW. The characteristics of the proposed method are as follows: by maintaining the design information and the safety analysis results unitarily in the whole CSW’s development process, one can develop safer CSW by conducting two kind of safety analysis. The proposed method contributes to realizing safer industrial products along with developing safer CSW. The proposed method adopts multiple safety analysis methods in adequate steps in the CSW development process, and the result of the safety analysis in a timely way reflects the design information. By executing the processes mentioned above, we can develop a safer CSW In this way, the proposed method enables seamless sharing of design information and safety analysis results throughout the development process, and improves the safety of CSW by repeating designing and safety analysis.
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