The results so far show that all the components of the DEE are working and that the optimization can take place in two steps, each fully automated, using the GA for the first step and SQP for the final optimization step. So far only optimizations have been done using different, single, objective functions and using the limits on the design variables as bounds for the design space. From Table 5 and 6 it becomes clear that optimization for the different disciplines within the limits on the design variables gives substantially different results. The next step therefore will be to define clear constraints on the acoustic and thermal properties and optimize for minimum total weight. This,

Objectivefuntion --> Delta T TL 1 TL 2 TL 3 G_opt program settings Number of members for each generation 100 100 100 100 Number of generations 200 200 200 200 Cross-over probability 0.75 0.75 0.75 0.75 Mutation probability 0.15 0.15 0.15 0.15 Design variables SkinThickness (mm) 2.0000 1.9922 2.0000 1.8471 NrFrames 8 8 12 20 NrStringers 80 100 90 80 StringerFactor 1.2765 1.0765 0.6137 0.8333 InteriorCoreThickness (mm) 4 7 5 6

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