Junction of a Blended Wing Body Aircraft

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1 Topology Optimization of the Wing-Cabin Junction of a Blended Wing Body Aircraft Bin Wei M.Sc. Ögmundur Petersson M.Sc

2 Challenge of wing root design Compare to conventional aircraft: Improved aerodynamic performance (fuselage produce lift also) Economic in fuel consumption Less external noise (about 10dB) But high requirements for the unconventional structures Large dimensions wing root complex 3D loading BWB fuselage section Folie 2

3 Design procedure overview Folie 3

4 Theoretical background of topology optimization Solid Isotropic Material with Penalty (SIMP) FEM based optimization Folie 4

5 Mission parameters and V-n diagram of the BWB ACFA2020 Folie 5

6 Preliminary load distribution on the wing of the BWB In aircraft longitudinal direction: linearly increase and then decrease In span wise direction: fuselage and 2/3 wing are constant and the rest linearly decrease +2.5 g maneuver load -1 g maneuver load Folie 6

7 Initial design space Initial design Transform the original design to a design space block Problematic area, mesh with poor quality elements Simplified design space without problematic area Folie 7

8 Topology optimization Goal: minimize the compliance of the structure Design Variables: density of individual elements Constraints: max. strain 0.5%, max. stress 300 MPa MPC connections to wing box and fuselage Folie 8

9 Animation of topology optimization Folie 9

10 Results of topology optimization Element size 100mm, 42 iterations Folie 10

11 The influence of element size Finer element size, better and clearer result, but higher computation cost Element size 200mm, 51 iterations Element size 90mm, 32 iteration Folie 11

12 Model interpretation and simplification Interpretation: Identify critical load paths Engineering experience Manufacturability CAD model Mid-surface model Folie 12

13 Goal: minimize the total mass DVs: Thickness of each part, Sizing optimization Flange dimensions (48 DVs, 3 to 150mm) Constraints: max. strain 0.4 % ( isotropic carbon fiber) Cross beams are changed to shells, to reinforce the connection Connections to wing box are reinforced Edges are reinforced with flanges Folie 13

14 The resulting design 2.7 m 13 m 0.86 m Blue parts are flanges 9 m 4.2 m 2.5 m Comparison to traditional shear web rib Folie 14

15 Results of element strain energy (ESE) in three designs Each optimization step leads to a more uniform ESE distribution (1) Design space block (2) Initial design from topology optimization (3) Result of sizing optimization and design changes Maximum ESE (J) % % Folie 15

16 Conclusions Effective, flexible and powerful design procedure Influencing factors: element size, constraints and loads as in classical analyses Interpretation requires skills and engineering experience (ideas from traditional designs) Subsequent sizing optimization improves design further and increases understanding Folie 16

17 Thank you for your attention Questions? Folie 17

18 Literature: Folie 18

19 Literature: Folie 19

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