基于动态因果图的智能仪表一体化失效分析

工业互联网在推动制造业升级换代的同时，也引入了信息安全问题，智能仪表等现场设备面临信息安全风险。为明确和分析在功能安全危险和信息安全威胁下智能仪表的失效原因和危害，本文提出了一体化因果失效分析方法框架，通过对功能安全和信息安全的融合失效分析，实现一体化因果失效路径推理。此外，对失效路径重要度通过结构、概率以及关键程度等属性量化评估，重要度表征失效路径发生的可能性大小，由此实现仪表安全失效场景精确分析。最后，通过智能变送器实践验证所提方法的有效性和可行性。本文通过动态因果图失效路径推理方法，首次揭示了智能仪表内部功能模块间安全失效渗透影响机理，实现仪表功能安全与信息安全一体化失效分析。

Integrated failure analysis for intelligent instruments with dynamic causal diagrams

While promoting the upgrading of traditional manufacturing, the industrial internet has introduced cyber security issues which makes industrial devices such as intelligent instruments face more severe cyber security risks. To effectively clarify and analyze the failure causes and hazards of intelligent instruments under functional safety and cyber security threats, this article proposes a method framework that enables reasoning and evaluation of integrated casual failure paths. Based on the framework, this article realizes the integrated failure analysis of functional safety and cyber security, and realizes the integrated causal failure path reasoning. Meanwhile, the importance of the failure path which represents the possibility of the path is quantitatively evaluated by attributes such as structure, probability and essence. Therefore, it realizes accurate analysis of instruments failure scenarios. Finally, the effectiveness and feasibility of the proposed method are evaluated by the intelligent transmitter. Through the failure path reasoning method based on dynamic causal diagram, it is the first time to reveal the influence principle of cyber security failure penetration between the internal functional modules of intelligent instruments, and realize the integrated failure analysis process of functional safety and cyber security.