Unformatted text preview: + S c d ) which is a suitable alternative objective function. The ±gure shows the isolines of V max versus the design variables, calculated using (1). The slight upturn in the isolines for decreasing AR is the Re eﬀect in c d . The sharp downturn near AR = 0 is due to the induced drag term. Isolines computed using the approximation (2) would be level. Now the stiﬀness-constrained optimum results in an unreasonably small wing, which means that other more practical constraints are likely to come into play. AR S 8 16 24 6 12 18 V max V max = 10 V max = 14 = 12 b b b δ/ = 0.2 δ/ = 0.05 δ/ = 0.01 V max = 16 Figure 1: Objective function contours (isolines) in design space of a rectangular wing. Dot shows the stiﬀness-constrained optimum point. 1...
View Full Document
- Fall '05
- Optimization, vmax, ηp ηm Pmax, ηm Pmax