Stiffness Optimization of Composite Wings with Aeroelastic Constraints

The drive for ever more efficient aircraft structures stimulates the research to use the full potential of anisotropy of composite materials. The stiffness optimization of the upper and lower skins of a composite wing is demonstrated in this paper. The wing was optimized taking into consideration the mass, strength, buckling, aerodynamic twist, and aileron effectiveness. The elements of the in-plane and bending stiffness matrices and laminate thicknesses were used as design variables. Static aeroelastic analysis was performed using Nastran to find the responses of the structure and their sensitivities to the design variables. The results of aeroelastic finite element analysis were processed to create efficient structural approximations of the responses. The approximations were used by a gradient-based optimizer to update the design variables. The separable and continuous approximations in terms of the design variables allowed for the use of efficient parallel computing strategies, in which single or multi...

[1]  T. A. Weisshaar,et al.  Optimum design of composite structures , 1989 .

[2]  R. N. Desmarais,et al.  Interpolation using surface splines. , 1972 .

[3]  Masaki Kameyama,et al.  Optimum design of composite plate wings for aeroelastic characteristics using lamination parameters , 2007 .

[4]  Z. Gürdal,et al.  Design of variable stiffness composite panels for maximum fundamental frequency using lamination parameters , 2007 .

[5]  Ulf Ringertz,et al.  On structural optimization with aeroelasticity constraints , 1994 .

[6]  J. V. Campen,et al.  Optimum lay-up design of variable stiffness composite structures , 2011 .

[7]  Ivo Babuška,et al.  The Problem of Selecting the Shape Functions for a p-Type Finite Element , 1989 .

[8]  Zafer Gürdal,et al.  Optimization of Variable-Stiffness Panels for Maximum Buckling Load Using Lamination Parameters , 2010 .

[9]  Mitsunori Miki,et al.  Optimum Design of Laminated Composite Plates Using Lamination Parameters , 1993 .

[10]  J. Dugundji,et al.  Aeroelastic flutter and divergence of stiffness coupled, graphite/epoxy cantilevered plates , 1984 .

[11]  H. Fukunaga,et al.  Optimal design of symmetric laminated plates for fundamental frequency , 1994 .

[12]  A. P. Nagy,et al.  Isogeometric design optimisation , 2011 .

[13]  Zafer Gürdal,et al.  Design of variable–stiffness laminates using lamination parameters , 2006 .

[14]  Zafer Gürdal,et al.  Approximate Feasible Regions for Lamination Parameters , 2006 .

[15]  T. Weisshaar.  Aeroelastic Tailoring of Forward Swept Composite Wings , 1981 .

[16]  V. B. Venkayya,et al.  Aeroelastic Tailoring of Composite Structures , 1999 .

[17]  Zafer Gürdal,et al.  Implementation of Strength-Based Failure Criteria in the Lamination Parameter Design Space , 2007 .

[18]  Raphael T. Haftka,et al.  Design and optimization of laminated composite materials , 1999 .

[19]  Raphael T. Haftka,et al.  Maximization of buckling loads of composite panels using flexural lamination parameters , 2004 .

[20]  Zafer Gürdal,et al.  Design of variable stiffness panels for maximum strength using lamination parameters , 2011 .

[21]  Christos Kassapoglou,et al.  Generating realistic laminate fiber angle distributions for optimal variable stiffness laminates , 2012 .

[22]  Martin P. Bendsøe,et al.  Parametrization in Laminate Design for Optimal Compliance , 1997 .

[23]  Roeland De Breuker,et al.  Aeroelastic tailoring using lamination parameters , 2010 .

[24]  Thomas Klimmek,et al.  Parameterization of topology and geometry for the multidisciplinary optimization of wing structures , 2009 .

[25]  Paul M. Weaver,et al.  Morphing Wing Design via Aeroelastic Tailoring , 2007 .

[26]  Zafer Gürdal,et al.  Multi-step blended stacking sequence design of panel assemblies with buckling constraints , 2009 .

[27]  Samuel T. IJsselmuiden.  Optimal Design of Variable Stiffness Composite Structures using Lamination Parameters , 2011 .

[28]  T. A. Weisshaar,et al.  Aeroelastic tailoring - Theory, practice, and promise , 1984 .

[29]  John A. Green,et al.  Aeroelastic tailoring of aft-swept high-aspect-ratio composite wings , 1987 .