Abstract
The goal of the paper is the integration of safety analysis in a model-based systems engineering approach to ensure consistency between system design and safety artifacts. This integration permits the continuous improvement of the structure and behavior of the system. It also reduces system development time and prevents late detection of errors. To reach this purpose, the SafeSysE methodology is extended. In SafeSysE, a preliminary Failure Mode and Effects Analysis (FMEA) is automatically generated from a SysML model, and this FMEA is then completed by the safety expert but no further development was proposed. The contribution of this paper is to suggest recommendations based on the FMEA analysis in order to enhance the system design and make it comply with safety requirements. First, an updated system structure that may contain redundancy is proposed. Then, a redundancy profile is used to enrich the system model with redundancy information, which will allow the generation of a dynamic fault tree considering the system behavior. Finally, the generated dynamic fault tree should be analyzed in order to create a state machine diagram that describes the behavior of the system. The created state machine with an internal block diagram will help the system designers to better understand the system dysfunctions by simulating the system. The proposed methodology is applied to an Electro-Mechanical Actuator system which is used in the aeronautics domain.
Highlights
Safety Analysis (SA) aims at assessing system safety and ensuring a Satisfactory Safety Level (SSL)of designed systems
The failure of a non redundant component or an external input port leads to the failure in the top level event and it is represented in the Dynamic Fault Tree (DFT) by a leaf event
The main contribution of this work is to narrow the gap between Model Based Systems Engineering (MBSE) and MBSA by integrating safety information in the systems engineering process
Summary
Safety Analysis (SA) aims at assessing system safety and ensuring a Satisfactory Safety Level (SSL). There is a gap between Model Based Systems Engineering (MBSE) [4] and SA as the latter takes place very late in the design process. To efficiently guide the systems engineer in making system architectural modifications according to the safety analysis recommendations, SafeSysE needs to be completed. The aim of this work is to extend SafeSysE by using FMEA and FTA feedback to improve system design, as well as by a new Dynamic Fault Tree (DFT) generation approach.
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