Large heavy lift airships have broad application prospects.However,design and analysis on advanced composite framework structures with large size and physical span have been one of the key technologies restricting the development of large heavy lift airships.This paper takes a certain heavy lift airship framework as the research object.We design an airship composite framework structure by considering the relevant requirements given by the overall design and selecting the more mature material system and structural connection form.The main structural element of the framework is a triangular truss beam,and a parametric modeling method based on Python is developed for the framework structure of the airship.Based on the principle of stiffness equivalence,the method transforms the triangular truss into a spatial beam element.It can automatically generate the overall finite element model of the framework and define the connection relationship.It realizes the parametric and rapid modeling of the framework structure.The overall stress and deformation calculation of the framework is carried out for the typical loading condition of hovering loading and unloading,and the"global-local"method is used to transform the equivalent beam element that has severe stress loads in the overall finite element analysis into a refined triangular truss model.Based on the Hashin failure criterion,the strength calculation and calibration are carried out for composite circular tubes,joints and other structural elements,and the results verifies the validity of the method.
关键词
重载飞艇/骨架/结构设计/等效模型/力学分析
Key words
heavy lift airship/framework/structural design/equivalent model/mechanical analysis
维普
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