The Lightweight Design And Flutter Analysis Of High Aspect Ratio Wing

This article is focus on high aspect ratio wing, and presents a concept of importanceevaluation factor, which uses to determine the standards of optimizing designing variables.Based on such standards, the lightweight design can be conducted and developed with finiteelement software. At last, there is a flutter analysis related to wing’s structure, which isoptimized.First of all, according to principle of the equivalent between quality and stiffness, andsimplifying of bear strength and driving force of each part of wing, it can carry out a rationalmechanical model. Choosing limited proper elements to establish high aspect ratio winglimited meta model. However, the actual working situation leads to some constraints, it issensible to analyze the static force of high aspect ratio wing, and check the original strengthand stiffness of designing structure.Secondly, this article proposes a new method of lightweight design to lighten the weightof high aspect ratio wing. According to the weighted sensitivity analysis of objective functionand state variables, it can introduce the importance evaluation factor of lightweight designingto determine the optimizing designing variables. By using some constraints related to strength,stiffness and modal frequency, it is reasonable to conduct the lightweight design via the finiteelement software. By analyzing data of some models, it proves that the modal frequency cansatisfy maximum stress and displacement well, which accumulative lighten the weight ofwing4.02%.Thirdly, in allusion to optimizing wing’s structure, the NASTRAN can help to establish awing’s aerodynamic model. By using the p-k method to calculate the flutter of wings’ variableheight, it can easily obtain the speed and frequency of flutter in different height, including thewing’s flight envelope, which verifies the rationality of lightweight design.