State-based safety analysis method for dynamic evaluation of failure effect
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ORIGINAL PAPER
State-based safety analysis method for dynamic evaluation of failure effect Yuqian Wu1 · Gang Xiao1 · Miao Wang1 Received: 5 August 2020 / Revised: 22 October 2020 / Accepted: 3 November 2020 © The Author(s) 2020
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. Keywords Failure effect analysis · Model-based safety analysis (MBSA) · Model-based system engineering (MBSE) · System simulation
1 Introduction Safety is a priority requirement in aircraft system design and operation. The failure effect analysis plays a significant role in the safety analysis. The traditional failure effect analysis methods, such as the Failure Mode and Effects Analysis, or the FMEA for short [5, 16], evaluate failure effects in the form of tables to verify the safety requirement. 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
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Miao Wang [email protected] Yuqian Wu [email protected] Gang Xiao [email protected]
1
School of Aeronautics and Astronautics, Shanghai Jiao Tong University, Shanghai 200240, China
prediction, including merge the dynamic influence of both internal and external parameters on the current system safety state. Therefore, the coherence between the system design model and the safety model should be further strengthened [2]. In recent years, the model-based safety analysis, or the MBSA for short [8, 12], has been used to combine the safety analysis process and design process. The existing MBSA methods, including the
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