Developing the Dynamic Hazard-Based Safety Engineering (D-HBSE) by Introducing the Control-Oriented Model

Traditional safety engineering approaches (reliability-oriented) were developed for relatively simple electro-mechanical systems, but new technology and functional requirements rapidly emerged; meanwhile, with the embedded systems and novel sensors that have been wildly applied, the interaction between hardware and software, as well as the corresponding design complexity exponentially increased, so the control-oriented model should be introduced to adapt the changed nature. This paper will illustrate why it is necessary to introduce the control-oriented model to hazard-based safety engineering (HBSE), based on a typical large core switching fan-tray architecture design and related failure model. Besides, the authors also provide detailed design and evaluation guidelines, which can ensure the control of random hardware failure and avoid systematic failure (both hardware and software), then achieve the safety target (i.e., safety integrity level).