摘要 :
Safety Assessment is paramount in aircraft design, and increasing aircraft complexity has led to the need for aircraft safety assessments in the early design stages. For unconventional aircraft or aircraft with novel propulsion or...
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Safety Assessment is paramount in aircraft design, and increasing aircraft complexity has led to the need for aircraft safety assessments in the early design stages. For unconventional aircraft or aircraft with novel propulsion or system technologies, it becomes even more critical to investigate safety as early as possible in the design process to avoid unfeasible aircraft configurations and system architectures. In this context, the Particular Risk Analysis (PRA) and the Zonal Safety Analysis (ZSA) are essential to assess early. Both of them require a three-dimensional (3D) model of the aircraft and systems. To analyze many aircraft configurations and system architectures, the 3D parametric model and the PRA and ZSA require automation. This paper reviews methodologies for performing the ZSA and PRA from a systems point-of-view and proposes parametric zone definition, identification of risk zones, and a conceptual level analysis of the component placement strategy. The effectiveness of the proposed approach is demonstrated with a main landing gear ZSA and a tire burst PRA case study for a conventional aircraft. The presented work is a step towards integrating system safety analysis into multidisciplinary analysis and optimization environments, thus increasing conceptual design maturity and reducing development time.
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摘要 :
The aviation industry is turning to novel aircraft concepts and systems to meet challenging environmental targets. New concepts such as hybrid and distributed electric propulsion add increasing complexity to aircraft system archit...
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The aviation industry is turning to novel aircraft concepts and systems to meet challenging environmental targets. New concepts such as hybrid and distributed electric propulsion add increasing complexity to aircraft system architectures. The systems architecting process must thus be modified to identify promising architectures early in the design process. Safety assessment plays a major role in the certification of aircraft systems and thus must be adapted to evaluate novel architectures in early design stages. At the same time, model-based systems engineering (MBSE) is used increasingly for system specification. The safety assessment process is following a similar trend, the so-called Model-Based Safety Assessment (MBSA), which is promising for complex systems architectures. This paper presents how a model-based specification can be used to conduct a Functional Hazard Analysis (FHA), a first step to integrating MBSE with the safety assessment process. A practical framework using the Capella tool is presented. An aircraft brake system example illustrates the effectiveness of the presented methodology using a variety of models and diagrams. Overall, the presented paper improves current MBSE and safety assessment practices for more effective development of future aircraft.
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