Abstract
Abstract The design and development of civil aircraft is a systematic engineering project with high precision and high complexity. Traditional aircraft requirements are based on document transmission, which is not intuitive and logical, and are easy to miss requirements in different scenarios The Model-based function analysis is a method that can identify and define all elements of a certain function. In the process of function analysis, the relation between the function interfaces can be determined and the relative requirements can be obtained, which can consequently ensure the validity and integrity of aircraft functional requirements. The functional modeling analysis is carried out based on a SysML model in this paper, and the function is described from the perspective of structural level, behavioral level and activity level by using graphical and hierarchical expression. The internal logic of the function is analyzed in depth to obtain the functional requirements of the aircraft.
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