Abstract
The large-scale system’s mission process and the interaction within the system are becoming more complex with the improvement of the integration and intelligence, and the complex interactions among multiple factors, such as the unsafe behavior of personnel, equipment failures, and environmental interference, make safety analysis a greater challenge. Aimed at the safety of carrier aircraft, an integrated system modeling and safety analysis method for aircraft landing process were proposed based on System Modeling Language (SysML) and Simulink. First, the SysML models were built according to the analysis of the mission process, including system structure and behavior process, using multiple diagrams. Second, the SysML models were transformed into and integrated with the Simulink platform to build entity models with continuous dynamic characteristics and to perform safety analysis through simulation. Finally, an example of aircraft attitude control during landing was given to demonstrate the proposed method, and the safety states were analyzed and assessed under different disturbance conditions.
Highlights
System Modeling Language (SysML) is the extension of UML to support the design and analysis of hardware
One is to use the SysML model to assist traditional safety analysis (e.g., FTA and FMEA) based on model checking, which belongs to indirect safety analysis. e other is to directly apply the SysML model to simulate system mission and/or behavior process and state change
For the former, the related research studies mainly focus on how to generate safety artifacts or minimal cut sets that violate specific attributes through the SysML model, and the traditional FTA and FMEA can be supported by SysML models [15, 16]. e semiformal modeling approach based on SysML was proposed to capture and structure safety requirements, and the safety purposes were verified by model-checking techniques [17]. ese methods can realize automatic or semiautomatic safety analysis and improve efficiency, but it is difficult to analyze the influence caused by the complex interaction and dynamic characteristics of the system
Summary
An integrated method of process modeling and safety analysis is proposed in this study, whose main process is shown in Figure 1. is method includes mainly 4 steps. E process dimension represents the dynamic evolution process during the mission, while the models of object dimension are transformed and integrated into the Simulink platform, including the machine and personnel control model and the environmental factors to support quantitative analysis. The state changes in the system are analyzed and the safety assessment is performed through simulation based on these models. Combined with the safety objectives and requirements, the safety states of the system can be determined, and these states and their changes are described in the conceptual models in the SysML, so the models can be used to support qualitative safety analysis and identify the evolution process of hazard in the mission. Rough the simulation integrating SysML and Simulink, the dynamic process of system states can be analyzed to assess the risk of system mission The disturbance of risk influence factors to the system is abstracted in the model. rough the simulation integrating SysML and Simulink, the dynamic process of system states can be analyzed to assess the risk of system mission
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