Mmultifunctional Optimization For Large Opening Area Of Aircraft By Using Bio-inspired Lightweight Structure

In natural biological materials, Beetle’s elytra is a typically lightweight and high efficiencyporous material, which has become one of the main bionic object to research the multifunctionalmaterial that have lightweight and high strength properties. In recently, the biological research onBeetle’s elytra mainly concern the mimic biological structures, and the preparation of structuralmaterial with similar properties, but the research on multi-functional design and application of thebio-inspired materials of beetle’s elytra are less.Firstly, the thermal model of the sandwich plate with the core of the bio-inspired lightweightstructure was established by using the "the equivalent medium model" in this paper. Then the heatdissipation performance of the plate was constructed. Secondly, the static and dynamic performanceof the plate was obtained by using the response surface method. Finally, the multifunctionaloptimization of the bio-inspired structure was realized after the overall objective function wasconstructed. Results show that the optimized bio-inspired lightweight structure has good thermal andmechanical performances, which can be used on stiffened plates at the open area of the plane.Furthermore, the optimized bio-inspired structure was applied on opening area of aircraft as thedesign of stiffened plate, then the layout optimization of the integral structure was constructed. Theapproximate model was settled by using the response surface method. The approximate model wasoptimized by using the genetic algorithm. Comparing the optimal solution of agent model with thefinite element result, it showed that the model meet the accuracy requirement. Under the same bearingcapacity condition, The first-order buckling factor of the optimized opening area reinforcementstructure was a largely increased, and the quality of the whole structure was also reduced about15%.The layer optimization was also needed for composite structures. Layer optimization model wasestablished by using the equivalent bending stiffness method, Then the best layer order wasdetermined after solved the discrete variable layer optimization problem by using genetic algorithm.The first-order buckling factor of the optimized opening area reinforcement structure was increased.The necessity for laminated board spreading layer optimization and the effectiveness of equivalentbending stiffness method for the symmetrical laminated board spreading layer optimization wasverified once again at the same time.