Intelligent Design Technology Of Aircraft Structural Parts Based On Model And Knowledge

With the development of aviation industry,the design quality and efficiency of aircraft structural parts are required in China.At present,the reuse of existing design knowledge in the design of aircraft structural parts is low,which leads to the repeated design process of aircraft structural parts with similar structural characteristics.Therefore,the design efficiency of aircraft structural parts is low.To solve this problem,the intelligent design technology of aircraft structural parts based on model and knowledge is proposed in this paper.By reusing the existing design knowledge of aircraft structural parts,the design of aircraft structural parts is completed,so as to improve the design efficiency of aircraft structural parts.This paper mainly uses CATIA secondary development technology,fuzzy expert system technology and variant design technology to design aircraft structural parts.This paper has mainly completed the following research contents:(1)Classifying aircraft structural parts by different types of aircraft structural parts,and analyze the structural characteristics and characteristic parameters of each type of aircraft structural parts.The main process of parameterized modeling is summarized,and the parameterized modeling of aircraft structural parts is carried out by using CATIA secondary development technology,and the existing model of aircraft structural parts is established.(2)The fuzzy expert system technology is used to select the types of aircraft structural parts.The design requirements of each type of aircraft structural parts are summarized and analyzed,and the rule base of fuzzy expert system is established.According to the design requirements of aircraft structural parts to be designed,rule reasoning is carried out,and the types of existing aircraft structural parts with the same design requirements are inferred.(3)According to the types of aircraft structural parts inferred by the fuzzy expert system,the similarity between the structural characteristic parameters of the aircraft structural parts to be designed and all the inferred aircraft structural parts models of this type is calculated by using the improved grey correlation algorithm.The model with the highest similarity is calculated,and the model is retrieved from the model library.Then,according to the characteristic parameters of the aircraft structural parts to be designed,the variant design of the model is carried out so as to complete the establishment of the new model of the aircraft structural parts.(4)According to the new model of aircraft structural parts after variant design,ANSYS was used for finite element simulation analysis to analyze whether the strength and stiffness of the model met the design requirements.Finally,the manufacturability analysis software was used to analyze the manufacturability of the model and the manufacturability of the model.Taking the profile and tie bar of aircraft structural parts as an example,this thesis verifies the feasibility of the above research contents,realizes the reuse of the existing design knowledge of aircraft structural parts,and improves the design efficiency of aircraft structural parts.