- Volume 13 Issue 4
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Various Structural Approaches to Analyze an Aircraft with High Aspect Ratio Wings
El Arras, Anas;Chung, Chan Hoon;Na, Young-Ho;Shin, SangJoon;Jang, SeYong;Kim, SangYong;Cho, Changmin
- Received : 2012.07.11
- Accepted : 2012.11.20
- Published : 2012.12.30
Aeroelastic analysis of an aircraft with a high aspect ratio wing for medium altitude and long endurance capability was attempted in this paper. In order to achieve such an objective, various structural models were adopted. The traditional approach has been based on a one-dimensional Euler-Bernoulli beam model. The structural analysis results of the present beam model were compared with those by the three-dimensional NASTRAN finite element model. In it, a taper ratio of 0.5 was applied; it was comprised of 21 ribs and 3 spars, and included two control surfaces. The relevant unsteady aerodynamic forces were obtained by using ZAERO, which is based on the doublet lattice method that considers flow compressibility. To obtain the unsteady aerodynamic force, the structural mode shapes and natural frequencies were transferred to ZAERO. Two types of unsteady aerodynamic forces were considered. The first was the unsteady aerodynamic forces which were based on the one-dimensional beam shape; the other was based on the three-dimensional FEM model shape. These two types of aerodynamic forces were compared, and applied to the foregoing flutter analysis. The ultimate goal of the present research is to analyze the possible interaction between the rigid-body degrees of freedom and the aeroelastic modes. This will be achieved after the development of a reliable nonlinear beam formulation that would validate the current results as well as enable a thorough investigation of the nonlinearity. Moreover, such analysis will allow for an examination of the above-mentioned interaction between the flight dynamics and aeroelastic modes with the inclusion of the rigid body degrees of freedom.
High aspect ratio wings;Flutter analysis;3-D finite element model;Euler-Bernoulli beam
- Friedmann, P., "Renaissance of Aeroelasticity and Its Future", Journal of Aircraft, Vol. 36, No. 1, 1999, pp. 105 - 121. https://doi.org/10.2514/2.2418
- Livne, E., "Future of Airplane Aeroelasticity" Journal of Aircraft, Vol. 40, No. 6, 2003, pp. 1066 - 1092. https://doi.org/10.2514/2.7218
- Van Schoor, M., Zerweckh, S., and Von Flotow, A., "Aeroelastic Stability and Control of a Highly Flexible Aircraft", Proceedings of 30th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference, Mobile, AL, 1989.
- Patil, M., Hodges, D., and Cesnik, C., "Nonlinear Aeroelasticity and Flight Dynamics of High-Altitude Long- Endurance Aircraft" Journal of Aircraft, Vol. 38, No. 1, 2001, pp. 88 - 94. https://doi.org/10.2514/2.2738
- Patil, M., Hodges, D., and Cesnik, C., "Nonlinear Aeroelastic Analysis of Complete Aircraft in Subsonic Flow", Journal of Aircraft, Vol. 37, No. 5, 2000, pp. 753 - 760. https://doi.org/10.2514/2.2685
- Hodges, D., and Dowell, E., "Nonlinear Equations of Motion for Elastic Bending and Torsion of Twisted Nonuniform Blades," NASA TN D - 7818, 1974.
- Chang, C., Hodges, D., and Patil, M., "Flight Dynamics of Highly Flexible Aircraft", Journal of Aircraft, Vol. 45, No. 2, 2008, pp. 538 - 545. https://doi.org/10.2514/1.30890
- Cesnik, C. E. S. and Hodges, D. H., "VABS: A New Concept for Composite Rotor Blade Cross-Sectional Modeling", Journal of the American Helicopter Society, Vol. 42, No. 1, 1997, pp. 27-38. https://doi.org/10.4050/JAHS.42.27
- Cesnik, C., and Brown, E., "Modeling of High Aspect Ratio Active Flexible Wings for Roll Control", 43rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, Denver, CO, 2002.
- Chung, C. H., Shin, S. J., and Kim, T., "Development and Verification of an Aircraft Flutter Analysis with Uncertainty", 48th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, Honolulu, Hawaii, 2007.
- Cesnik, C. "Active Twist Rotor Blade Modeling Using Particle-Wake Aerodynamics and Geometrically Exact Beam Structural Dynamics", Journal of Fluids and Structures, Vol. 19, Issue 5, 2004, pp 651-668. https://doi.org/10.1016/j.jfluidstructs.2004.01.007
- Cesnik, C. and Shin, S. J., "On the Modeling of Active Helicopter Blades", Int. Journal of Solids and Structures, Vol. 38, No. 10 - 13, 2001, pp. 1765 - 1789. https://doi.org/10.1016/S0020-7683(00)00135-9
- Su, W., "Coupled Nonlinear Aeroelasticity and Flight Dynamics of Fully Flexible Aircraft," Ph.D. Dissertation, Aerospace Engineering, University of Michigan, Ann Arbor, MI, 2008.
- Peters, D. A. and Johnson, M. J., "Finite-State Airloads for Deformable Airfoils on Fixed and Rotating Wings," Symposium on Aeroelasticity and Fluid/Structure Interaction, Proceedings of the Winter Annual Meeting, Chicago, IL, 1994.
Supported by : Korean Institute of Energy Technology Evaluation and Planning (KETEP)