SysML-Based Approach for Functional Quantitative Modeling of Civil Aircraft Systems

During the conceptual design phase of civil aircraft systems, it is imperative that engineers accurately establish the functional representation of the system and ensure its correctness to provide a solid foundation for subsequent detailed design. Traditional document-based methods for functional representation frequently result in ambiguity, making it difficult to precisely communicate design requirements. Therefore, the academic community is committed to using model-based system engineering to achieve functional representation. However, existing model-based functional representation techniques primarily focus on describing functional input/output, rather than explicitly expressing functional input/output conversions, which can impede system engineers from verifying functional completeness. In response to this issue, this paper proposes a functional quantitative modeling approach for civil aircraft systems based on SysML. Firstly, a quantitatively-analyzable flow model is established, and a general functional model of integrated structure, state, and behavior is subsequently developed based on this flow model. Next, a hierarchical functional model of the system is introduced. Finally, to verify the proposed approach, the elevator surface control system is employed as an example, and a quantitative analysis of the functional model is presented.