This presentation aims to characterize time-dependent fail-safe systems with escalating mitigation strategies and present a structured approach for developing requirements for their primary functions. The introduction highlights the significance of fail-safe mechanisms in safety-critical systems and sets the stage for discussing the unique attributes of time-dependent fail-safe systems, which maintain functionality post-fault, enforce timely transitions to safe states, and escalate mitigation strategies that may introduce controlled hazards. The core of the presentation outlines a systematic methodology for developing requirements, detailing each step from defining the primary function to prioritizing fail-safe strategies based on severity outcomes. The approach emphasizes the importance of identifying risks and hazards, defining safe states, and ensuring traceability of requirements to associated risks. A case study is presented that illustrates the identification of risks associated with loss of a safety critical function due to a fault, the definition of a safe state (e.g., the vehicle coming to a complete stop), and the development of fail-safe mitigation strategies to achieve this safe state within the required timeframe.
In this session, you will:
- Learn how to develop time-dependent fail-safe systems that maintain functionality post-fault and transition safely with escalating mitigation strategies
- Discover what systematic methods help prioritize fail-safe strategies by identifying risks, defining safe states, and ensuring requirement traceability
- See how a case study illustrates risk identification, safe state definition, and mitigation strategies for timely fault response
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