1. MULTI-FIDELITY WING MASS ESTIMATION BASED ON A CENTRAL MODEL APPROACH 71th Annual Conference SAWE 2012 D. Böhnke, F. Dorbath, B. Nagel, V. Gollnick Integrated Aircraft Design, DLR-LY

2. …derive a new method for determination of the wing weight that features the quality of a physic based model but is still as easy and quick to evaluate as a handbook method… www.DLR.de Chart 2SAWE 2012 > Daniel Böhnke > 09.05.2012

3. www.DLR.de Chart 3 ► Design Environment ► Multi-Fidelity ► Trade Study ► Results ► Conclusion ► Design Environment ► Multi-Fidelity ► Trade Study ► Results ► Conclusion

4. www.DLR.de Chart 4SAWE 2012 > Daniel Böhnke > 09.05.2012 Common Language Analysis Modules Engineering Framework

5. www.DLR.de Chart 5SAWE 2012 > Daniel Böhnke > 09.05.2012 ► n(n-1) ► 2n ► Reduce No. of interfaces ► Standardize ► Product and process information ► Human readable

6. www.DLR.de Chart 6SAWE 2012 > Daniel Böhnke > 09.05.2012 CPACSCPACS PESTwing Conceptual Integration Initialization Requirements VAMPzero TRIMvl

7. VAMPzero ► Conceptual design ► Handbook methods ► Input ► Design requirements ► Wing characteristics ► Output ► Geometry ► Structure ► Process information www.DLR.de Chart 7SAWE 2012 > Daniel Böhnke > 09.05.2012

8. TRIM VL ► Specialised AVL ► Input ► Geometry ► LoadCase ► Weight and balance ► Output ► Lift distribution www.DLR.de Chart 8SAWE 2012 > Daniel Böhnke > 09.05.2012

9. PESTwing ► Wing mass estimation ► Beam theory & statistical extension ► Inputs ► Geometry ► Structures ► (Lift distribution) ► Wing mass ► Physics based ► Analytic corrections ► Spars & skins ► Secondary structures www.DLR.de Chart 9SAWE 2012 > Daniel Böhnke > 09.05.2012

10. Symbolic Regression www.DLR.de Chart 10SAWE 2012 > Daniel Böhnke > 09.05.2012

11. www.DLR.de Chart 11SAWE 2012 > Daniel Böhnke > 09.05.2012 LTHRaymerShevellTorenbeek Max. TOWxxx Max. ZFW xx Ref. Areaxxxx Span xx Aspect Ratioxx Thickness Ratioxx´xx Sweepxxxx Load Factor xxx Taper Ratio xx CS Area x

12. www.DLR.de Chart 12SAWE 2012 > Daniel Böhnke > 09.05.2012 HighLow Max. TOW[kg]6000090000 Aspect Ratio[ ]616 Thickness Ratio[ ]0.10.16 Sweep[deg]-2040 Taper Ratio[ ]0.10.6

13. Aspect Ratio SAWE 2012 > Daniel Böhnke > 09.05.2012www.DLR.de Chart 13

14. mTOM SAWE 2012 > Daniel Böhnke > 09.05.2012www.DLR.de Chart 14

15. Sweep SAWE 2012 > Daniel Böhnke > 09.05.2012www.DLR.de Chart 15

16. Taper Ratio SAWE 2012 > Daniel Böhnke > 09.05.2012www.DLR.de Chart 16

17. Thickness SAWE 2012 > Daniel Böhnke > 09.05.2012www.DLR.de Chart 17

18. ► Deriving f() via Symbolic Regression ► Real aircraft data ► Eliminate influence on g() ► Similar to Shevell’s approach www.DLR.de Chart 18SAWE 2012 > Daniel Böhnke > 09.05.2012

19. www.DLR.de Chart 19SAWE 2012 > Daniel Böhnke > 09.05.2012

20. Conclusion ► Central model approach ► Multi-Fidelity coupling ► Determination of wing mass with physic based methods ► Derivation of equations ► Successful, but further work necessary www.DLR.de Chart 20SAWE 2012 > Daniel Böhnke > 09.05.2012

21. Outlook ► Physical modeling of secondary structures ► Flaps ► Aileron ► Slats ► Spoiler ► Further eliminate statistical dependencies ► Coping with lift distributions www.DLR.de Chart 21SAWE 2012 > Daniel Böhnke > 09.05.2012

22. Thanks for your attention! www.DLR.de Chart 22SAWE 2012 > Daniel Böhnke > 09.05.2012