Shape Optimization and Sensitivity Analysis of a Morphing-Wing Aircraft

다국어 초록 (Multilingual Abstract)

Morphing-wing concepts have received growing interests in the recent years for enhancing the multi-mission performance of unmanned aerial vehicle. However, to obtain a feasible morphing strategy, the optimization design studies are required. In this paper, an aerodynamic optimization study for a morphing-wing aircraft with variable sweep, span, and chord length was conducted to obtain the optimum configurations at subsonic, transonic and supersonic conditions. The optimization objective is to obtain maximum lift-to-drag ratios subject to lift coefficients and static stability constraints at each flight condition. A genetic algorithm in conjunction with surrogate models was employed to search optimum solutions in the entire design space.
The aerodynamic forces are calculated by an Euler-based solver and friction drag estimation code. The optimum configuration corresponding to any flight condition can be determined through the optimization. A global sensitivity analysis based on the surrogate model was also carried out, hence the contribution of each design variable to the optimization objective can be analyzed. The results indicated that the optimum wing at subsonic speeds have a lower sweep angle and high aspect ratio, and the wing sweep has a primary contribution to lift-to-drag ratios, and the span is secondary; at transonic conditions, the medium-sweep wing is the optimum, and the contribution of the span is farmore than other variables; at supersonic conditions, the optimum configuration becomes a high-sweep cropped delta wing, and the span has a dominant contribution, and the sweep is secondary.

참고문헌 (Reference)

1 Woods BKS, "The adaptive aspect ratio morphingwing : design concept and lowfidelity skin optimization" 42 : 209-217, 2016

2 "The 2nd AIAA CFD Drag Prediction Workshop"

3 Queipo NV, "Surrogate-based analysis and optimization" 41 : 1-28, 2005

4 Changli Hu, "Surrogate model-based optimization for the headform design of an axisymmetric body" 107 : 237-245, 2015

5 Youda Ye, "Study on aerodynamic characteristics and design optimization for high speed near space vehicles" 39 (39): 683-694, 2009

6 Ajaj RM, "Span morphing : a conceptual design study" 2012

7 Cannavó Flavio, "Sensitivity analysis for volcanic source modeling quality assessment and model selection" 44 : 52-59, 2012

8 Saltelli A, "Sensitivity analysis for nonlinear mathematical models : numerical experience" 7 (7): 16-28, 1995

9 Forrester AIJ, "Recent advances in surrogate-based optimization" 45 : 50-79, 2009

10 Vasista S, "Realization ofmorphing wings : a multidisciplinary challenge" 49 (49): 11-28, 2012

11 Su WH, "Optimum wing shape of highly flexible morphing aircraft for improved flight performance" 53 (53): 1-12, 2016

12 Ismail NI, "Optimization of aerodynamic efficiency for twist morphing MAV wing" 27 (27): 475-487, 2014

13 Gamboa P, "Optimization of a morphing wing based on coupled aerodynamic and structural constraints" 47 (47): 2087-2104, 2009

14 Kenway GKW, "Multipoint aerodynamic shape optimization investigations of the common research model wing" 54 (54): 113-128, 2016

15 Weisshaar TA, "Morphing aircraft systems : historical perspectives and future challenges" 50 (50): 337-353, 2013

16 Ajaj RM, "Morphing aircraft : the need for a new design philosophy" 49 (49): 154-166, 2016

17 "McDonald R Open VSP"

18 McDonald RA, "Interactive reconstruction of 3D models in the openVSP parametric geometry tool" 2015

19 Ordaz I, "Integration of off-track sonic boom analysis in conceptual design of supersonic aircraft" 51 (51): 23-28, 2014

20 Hicken JE, "Induced-drag minimization of nonplanar geometries based on the euler equations" 48 (48): 2564-2575, 2010

21 Gur O, "Full configuration drag estimation" 47 (47): 110-116, 2010

22 Gagnon H, "Euler-equation-based drag minimization of unconventional aircraft configurations" 53 (53): 1361-1371, 2016

23 Mestrinho J, "Design optimization of a variable-span morphing wing for a small UAV" 2011

24 Secanell M, "Design of a morphing airfoil using aerodynamic shape optimization" 44 (44): 1550-1562, 2006

25 Xuzhao He, "Design and experimental study of a practical Osculating Inward Cone Waverider Inlet" 29 (29): 1582-1590, 2016

26 Ordaz I, "Conceptual design of low-boom aircraft with flight trim requirement" 52 (52): 932-939, 2015

27 Sahu J, "Computations of supersonic flow over a complex elliptical missile configuration" 2009

28 Aftosmis MJ, "Cart3D Resource Website"

29 Nemec M, "CAD-based aerodynamic design of complex configurations using a cartesian method" 2004

30 Hunsaker DF, "Aerodynamic shape optimization of morphing wings at multiple flight conditions" 2017

31 Lyu Z, "Aerodynamic shape optimization investigations of the common research model wing benchmark" 53 (53): 968-985, 2015

32 SpearmanML, "Aerodynamic research at NACA/NASA langley related to the use of variable-sweep wings" 2012

33 Namgoong H, "Aerodynamic optimization of a morphing airfoil using energy as an objective" 45 (45): 2113-2124, 2007

34 Fincham JHS, "Aerodynamic optimisation of a camber morphing aerofoil" 43 : 245-255, 2015

35 Bae J-S, "Aerodynamic and static aeroelastic characteristics of a variable-span morphing wing" 42 (42): 528-534, 2005