Static aeroelastic analysis of a high-aspect-ratio wing based on wind-tunnel experimental aerodynamic forces
Tóm tắt
The aeroelastic responses of a high-aspect-ratio wing are investigated based on nonlinear experimental aerodynamic forces. The influences of nonlinear experimental aerodynamic forces and dynamic pressures on the wing loads are studied in the longitudinal and lateral maneuver states. The flight loads of the wing fixed at the root are calculated at different angles of attack. The aileron efficiency with respect to the dynamic pressures and aileron deflections are also studied. The results indicate that the flight loads of the wings vary nonlinearly with the angle of attack and dynamic pressure. Due to the high-lift aerofoil, elastic components are a large portion of the wing loads, especially for small angles of attack and high dynamic pressure conditions. The aileron efficiency is significantly affected by aileron deflections, dynamic pressures and angles of attack when the nonlinear experimental aerodynamic forces are used for calculation. In states with high dynamic pressures and large aileron deflections, aileron reversal can occur. The aileron deflection and angle of attack have a nonlinear effect on the aileron efficiency. An efficient method for analyzing the flight loads and structural design of high-aspect-ratio wings is derived in this study, and the analysis can provide insight into the distribution of flight loads for high-aspect-ratio wings.
Tài liệu tham khảo
Ran Y G, Liu H, Zhang J M, et al. Anlysis of the nonlinear aeroelastic response for large-aspect-ratio wing (in Chinese). Acta Aerodynamica Sinica, 2009, 27(4): 394–399
Xie C C. Aeroelastic analysis of flexible large aspect ratio wing (in Chinese). J Beijing U Aeron Astron, 2003, 29(12): 1087–1090
MSC. Nastran Version 2001 Release Guide. Los Angeles: MSC Software Corporation, 2001. 127–165
Wan Z Q, Deng L D, Yang C, et al. Aircraft static aeroelastic response analysis based on nonlinear experimental aerodynamic data (in Chinese). Acta Aeronauticaet Astronautica Sinica, 2005, 26(4): 439–445
Deng L D, Li T. Research of nonlinear flight loads calculation on a flexible aircraft (in Chinese). Flight Dynam, 2004, 22(4): 85–88
Yan D, Yang C. Flight loads analysis of longitudinal maneuver using experimental aerodynamic forces (in Chinese). J Beijing U Aeron Astron, 2007, 33(3): 253–256
Shao K, Wan Z Q, Yang C. Control surfaces efficiency analysis of a flexible aircraft based on experimental aerodynamic forces (in Chinese). Acta Aeronauticaet Astronautica Sinica, 2009, 30(9): 1612–1617
Rodden W P, Johnson E H. MSC/Nastran Aeroelastic Analysis User’s Guide V68. Los Angeles: MSC Software Corporation, 1994. 44–65
Neill D J, Herendeen D L, Venkayya V B. ASTROS Enhancements. ASTROS Theoretical Manual. AD-A308134, 1995
Markowitz J, Isakson G. FASTOP-3: a strength, deflection and flutter optimization program for metallic composite structures. AFFDL-TR-78-50, 1978
Harder R L, Desmarais R N. Interpolation using surface spline. J Aircraft, 1972, 9(2): 189–191
Chen G B, Zou C Q, Yang C. Elements of Aeroelastics (in Chinese). Beijing: Beijing University of Aeronautics and Astronautics Press, 2004. 5–22
Etkin B. Dynamics of Atmospheric Flight (in Chinese). Beijing: Science Press, 1972. 300–304