Research On Optimal Design Method Of Aerospace Structure Oriented To Additive Manufacturing

Weight reduction is the eternal theme of aircraft optimization.In the process of weight reduction,the main methods are material change,structure change and processing mode change.In the process of aircraft structure design,due to the large size of structural components,complex boundary and load conditions,these factors restrict the development of optimization technology in aviation field to a certain extent.At present,the research object of optimization technology in the aviation field mainly focuses on the structural design of large aircraft parts,such as the wing and fuselage,and less on the structural optimization of small and medium aircraft parts.Therefore,the research on the optimization design method of aviation structure for additive manufacturing has important theoretical significance and engineering application value.Firstly,through the application of topology optimization technology,lattice optimization technology and additive manufacturing technology,the optimization design method of aviation complex structure for additive manufacturing is studied.Secondly,with the joint of wing strut as the topology optimization object,the maximum stiffness as the objective,the unit density as the design variable and the mass as the constraint condition,the lightweight design of wing strut is carried out,and the topology optimization design method for additive manufacturing is verified.Then,according to the requirements of lightweight design of rocker arm,the lattice optimization design process of rocker arm for additive manufacturing is designed.The finite element analysis method is used to optimize the lattice of rocker arm by inspire,and the lightweight design of rocker arm is completed.Finally,taking the tethered joint as the optimization object,by analyzing the external load and constraints of the tethered joint,the finite element model of the tethered joint structure is established,and the topology optimization theory and lattice optimization theory are comprehensively applied to optimize the structure of the tethered joint.The optimization design method of aviation complex structure for additive manufacturing is studied,and a complete set of optimization design process is proposed.The structural performance of aviation products is simulated by finite element software,and the feasibility of the optimization theory is verified.