Research On Trailing With Compliant Mechanism And Topological Optimization Based On The Load Path

Adaptive wing is one of development directions of future aircrafts. According to the flight state and flow conditions, it change shape self-acting to keep optimal pneumatic appearance, this make it improve the aircraft comprehensive performance significantly. Compliant mechanism can transmit force,energy,displacement and realize deformation through their own elastic deformation. As a new and developing mechanism, compliant mechanism can not only achieve continuous smooth shape changing, but also without assembly and friction, which is needed in adaptive wing, for this reason compliant attracted researchers'attention.This paper used the compliant mechanism to realize the adaptive wing. On the basis of up to date design method of the compliant from home and abroad, analyzed and compared traditional topology designs and topological optimization based on the load path. Then picked up the advantages of the latter from the comparison, made sure applying the topology optimization based on the load path to design trailing of adaptive wing, which was the first time in the research both topological optimization based on the load path and the trailing of adaptive wing.First of all, according to the definition of topological optimization based on the load path, determined load paths by KSSP algorithms after initializing the design area. Secondly according to the idea of this method, chose reasonable design variables and made sure update scheme about these variables. This process solved the problem in putting theoretical method into practice. Thirdly, established parametric finite element model with the PCL (Patran Command Language) language in the finite element software Patran for next optimization. Then through choosing optimization algorithms after optimization model had been made up, got the result which has been proved feasible in the finite-element analysis. Finally, in order to confirm this result further, made a physical model of trailing rib for experiment. The experimental result showed that the rib obtained a preferable fruit and achieved expectant aim. It demonstrated the topological optimization based on the load path, which was a new design method of compliant mechanism, was feasible in adaptive wing.