Morphing Wing Structural Optimization Using Opposite-Based Population-Based Incremental Learning and Multigrid Ground Elements

S Sleesongsom,S Bureerat

doi:10.1155/2015/730626

Abstract

This paper has twin aims. Firstly, a multigrid design approach for optimization of an unconventional morphing wing is proposed. The structural design problem is assigned to optimize wing mass, lift effectiveness, and buckling factor subject to structural safety requirements. Design variables consist of partial topology, nodal positions, and component sizes of a wing internal structure. Such a design process can be accomplished by using multiple resolutions of ground elements, which is called a multigrid approach. Secondly, an opposite-based multiobjective population-based incremental learning (OMPBIL) is proposed for comparison with the original multiobjective population-based incremental learning (MPBIL). Multiobjective design problems with single-grid and multigrid design variables are then posed and tackled by OMPBIL and MPBIL. The results show that using OMPBIL in combination with a multigrid design approach is the best design strategy. OMPBIL is superior to MPBIL since the former provides better population diversity. Aeroelastic trim for an elastic morphing wing is also presented.

Highlights

Design/optimization of a morphing wing aircraft structure is a research field investigated throughout the world
The results show that using opposite-based multiobjective population-based incremental learning (OMPBIL) in combination with a multigrid design approach is the best design strategy
Nondominated fronts and the search history of all design problems obtained from the best runs of both multiobjective population-based incremental learning (MPBIL) and OMPBIL are shown in Figures 8 and 9, respectively

Summary

Introduction

Design/optimization of a morphing wing aircraft structure is a research field investigated throughout the world. It has been found that the shape and structural flexibility of a morphing aircraft greatly affect its flight performance [1] This leads to continuous shape change and is called a morphing concept, which is an attempt to avoid using conventional hinged control surfaces. In the lateral wing bending concept, the wing can bend up and down in a vertical direction so as to produce a wing span camber Using this concept, wing aerodynamic performance can be varied and it is carried out by using an internal mechanism. The morphing wing structures are elastic rather than perfectly rigid; consideration of their aeroelastic behavior is essential in a design process This leads to recent work in which the effects of the external force on aeroelastic characteristic of a morphing aircraft wing are studied [10]. The result shows that the actuating force has a significant

Objectives

Results

Conclusion