Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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Structural Optimization of a Joined-Wing Using Equivalent Static Loads

등가정하중을 이용한 접합날개의 구조최적설계

  • Published : 2006.05.01
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Abstract

The joined-wing is a new concept of the airplane wing. The fore-wing and the aft-wing are joined together in a joined-wing. The range and loiter are longer than those of a conventional wing. The joined-wing can lead to increased aerodynamic performance and reduction of the structural weight. In this research, dynamic response optimization of a joined-wing is carried out by using equivalent static loads. Equivalent static loads are made to generate the same displacement field as the one from dynamic loads at each time step of dynamic analysis. The gust loads are considered as critical loading conditions and they dynamically act on the structure of the aircraft. It is difficult to identify the exact gust load profile. Therefore, the dynamic loads are assumed to be (1-cosine) function. Static response optimization is performed for the two cases. One uses the same design variable definition as dynamic response optimization. The other uses the thicknesses of all elements as design variables. The results are compared.

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References

  1. Wolkovich J., 1986, 'The Joined-Wing: An Overview,' Journal of Aircraft, Vol. 23, No. 3, pp. 161-178 https://doi.org/10.2514/3.45285
  2. Gallman J. W. and Kroo I. M., 1996, 'Structural Optimization of Joined-Wing Synthesis,' Journal of Aircraft, Vol. 33, No. 1, pp. 214-223 https://doi.org/10.2514/3.46924
  3. Blair M., Canfield R. A. and Roberts R. W., 2005, 'Joined-Wing Aeroelastic Design with Geometric Nonlinearity,' Journal of Aircraft, Vol. 42, No. 4, pp. 832-848 https://doi.org/10.2514/1.2199
  4. Blair M. and Canfield R. A., 2002, 'A Joined-Wing Structural Weight Modeling Study,' 45th AIAA/ASME/ASCE/AHS/ASC Structures. Structural Dynamics and Materials Conference, Denver Colorado, USA
  5. Roberts R. W., Canfield R. A. and Blair M., 2003, 'Sensor-Craft Structural Optimization and Analytical Certification,' 44th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference, Norfolk Virginia, USA
  6. Rasmussen C. C, Canfield R. A. and Blair M., 2004, 'Joined-Wing Sensor-Craft Configuration Design,' 45th AIAA/ASME/AHS/ASC Structures, Structural Dynamics and Materials Conference, Palm Springs California, USA
  7. Rasmussen C. C, Canfield R. A. and Blair M., 2004, 'Optimization Process for Configuration of Flexible Joined-Wing,' 10th AIAA/ISSMO Multidisciplinary Analysis and Optimization Conference, Albany New York, USA
  8. Kang B. S., Park G. J., J.S. Arora, 2005, 'A Review of Optimization of Structures Subjected to Transient Loads,' Structural and Multidisciplinary Optimization (accepted) https://doi.org/10.1007/s00158-005-0575-4
  9. Choi W. S. and Park G. J., 1999, 'Transformation of Dynamic Loads into Equivalent Static Loads Based on Model Analysis,' International Journal for Numerical Methods in Engineering, Vol. 46, No. 1, pp. 29-43 https://doi.org/10.1002/(SICI)1097-0207(19990910)46:1<29::AID-NME661>3.0.CO;2-D
  10. Choi W. S. and Park G. J., 2000, 'Quasi-Static Structural Optimization Technique Using Equivalent Static Loads Calculated at Every Time Step as a Multiple Loading Condition,' Transactions of the KSME (A), Vol. 24, No. 10, pp. 2568-2580
  11. Choi W. S. and Park G. J., 2002, 'Structural Optimization Using Equivalent Static Loads at All the Time Intervals,' Computer Methods in Applied Mechanics and Engineering, Vol. 191, No. 19, pp. 2077-2094 https://doi.org/10.1016/S0045-7825(01)00373-5
  12. Kang B. S., Choi W. S. and Park G. J., 2003, 'Structural Optimization Under Equivalent Static Loads Transformed from Dynamic Loads Based on Displacement,' Computers & Structures, Vol. 79, pp. 145-154 https://doi.org/10.1016/S0045-7949(00)00127-9
  13. Park G. J. and Kang B. S., 2003, 'Mathematical Proof for Structural Optimization with Equivalent Static Loads Transformed from Dynamic Loads,' Transactions of the KSME (A), Vol. 27, No. 2, pp. 268-275 https://doi.org/10.3795/KSME-A.2003.27.2.268
  14. Park G. J. and Kang B. S., 2003, 'Validation of a Structural Optimization Algorithm Transforming Dynamic Loads into Equivalent Static Loads,' Journal of Optimization Theory and Applications, Vol. 118, No. 1, pp. 191-200 https://doi.org/10.1023/A:1024799727258
  15. Park K. J., Lee J. N. and Park G. J., 2005, 'Structural Shape Optimization Using Equivalent Static Loads Transformed from Dynamic Loads,' International Journal for Numerical Methods in Engineering, Vol. 63, No. 4, pp. 589-602 https://doi.org/10.1002/nme.1295
  16. Kang B. S., Park G. J. and Arora J. S., 2005, 'Optimization of flexible Multibody Dynamic Systems Using the Equivalent Static Load,' Journal of American Institute Aeronautics and Astronautics, Vol. 43, No. 4, pp. 846-852 https://doi.org/10.2514/1.4294
  17. GENESIS User Manual: Version 7.0, 2001, Vanderplaats Research and Development, Inc.
  18. MSC.NASTRAN 2004 Reference Manual, 2003, MSC.Software Corporation
  19. Hoblit F. M., 1988, 'Gust Loads on Aircraft: Concepts and Applications,' American Institute of Aeronautics and Astronautics, Inc., Washington, D.C., USA
  20. T.H.G. Megson, 1999, 'Aircraft Structures, Engineering Students Third Edition,' Butterworth Heinemann, London, U.K.
  21. Kareem A. and Zhou Y., 2003, 'Gust Loading Factor-Past, Present and Future,' Journal of Wind Engineering and Industrial Aerodynamics, Vol. 91, No. 12/15, pp. 1301-1328 https://doi.org/10.1016/j.jweia.2003.09.003
  22. Corke T. C., 2002, 'Design of Aircraft,' Prentice Hall, New Jersey, USA
  23. Corke T. C., 2002, 'Design of Aircraft,' Prentice Hall, New Jersey, USA
  24. Rao S. S., 1985, 'Optimization of Airplane Wing Structures Under Gust Loads,' Computers & Structures, Vol. 21, No. 4, pp. 741-749 https://doi.org/10.1016/0045-7949(85)90150-6
  25. Noback R., 1986, 'Comparison of Discrete and Continuous Gust Methods for Airplane Design Loads Determination,' Journal of Aircraft, Vol. 23, No. 3, pp. 226-231 https://doi.org/10.2514/3.45293
  26. Fuller J. R., 1995, 'Evolution of Airplane Gust Loads Design Requirements,' Journal of Aircraft, Vol. 32, No. 2, pp. 235-246 https://doi.org/10.2514/3.46709
  27. Singh R. and Baeder J. D., 1997, 'Generalized Moving Gust Response Using CFD with Application to Airfoil-vortex Interaction,' 15th AIAA Applied Aerodynamics Conference, Atlanta Georgia, USA