Abstract
System state that represents a combined influence of internal and external system parameters on the overall failure effect plays a significant role in failure effect analysis. The traditional safety analysis methods can hardly evaluate the overall failure impact due to the dynamic failure behaviors in diverse system interaction situations. To overcome this problem, this paper proposes a state-based safety analysis method for dynamic evaluation of the failure effect combining the situation factor. First, a hierarchical modeling framework that includes functional logic, physical architecture, and the failure mode is constructed, and then the cross-linking relationships between items are characterized by the state machines. Particularly, the event transmission mechanism and the global attribute updating mechanism are designed to realize the state synchronization of various systems, thus enabling the global propagation of failure. The feasibility of the proposed method is verified by simulations. The Enterprise Architect platform is used to model the aircraft integrated surveillance system and analyze the effects of different failure modes in typical situations. The proposed method complements the failure effect evaluation accuracy considering the dynamic interaction situations, thus realizing the global perception of the safety state, enhancing the dynamics and integrity of the failure effect analysis process.
Highlights
Safety is a priority requirement in aircraft system design and operation
Despite the time and cost of a manual model construction [13], an increase in system complexity has posed the limitation on the accuracy of the failure effect analysis, which yields to the inability of the traditional static analysis method in the system reaction
Aiming at a dynamic and systematical evaluation of failure effect on the safety under various situations, this paper proposes a state-based dynamic safety analysis method based on an executable state machine
Summary
Safety is a priority requirement in aircraft system design and operation. The failure effect analysis plays a significant role in the safety analysis. The application of the SmartIflow method to the complex systems remains limited, since the way of expressing various situations in the failure state modeling and updating process is still obscure, which limits the accuracy and comprehension of the failure-effect analysis results. This paper proposes a state-based safety analysis method for a dynamic description of the failure effect, considering the situation of multiple system coherence. The proposed method includes the global state updating mechanism specially designed to conduct the dynamic analysis and the global perception of the safety state under various situations. To achieve the safety analysis objective from the situation perspective, in the proposed framework, each system layer is modeled and presented in the form of structure and behavior diagrams. The block definition diagram and internal block diagram are combined to depict the structural decomposition, and the state machine diagram is introduced to represent interactional behaviors of the different system modes, as well as mapping elements of different layers
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