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- Title
Nonlinear aeroelasticity of high-aspect-ratio wings excited by time-dependent thrust.
- Authors
Mardanpour, Pezhman; Hodges, Dewey; Rezvani, Reza
- Abstract
Effects of engine placement on flutter characteristics of a very flexible high-aspect-ratio wing are investigated using the code NATASHA (Nonlinear Aeroelastic Trim And Stability of HALE Aircraft). Gravity for this class of wings plays an important role in flutter characteristics. In the absence of aerodynamic and gravitational forces and without an engine, the kinetic energy of the first two modes are calculated. Maximum and minimum flutter speed locations coincide with the area of minimum and maximum kinetic energy of the second bending and torsion modes. Time-dependent dynamic behavior of a turboshaft engine (JetCat SP5) is simulated with a transient engine model and the nonlinear aeroelastic response of the wing to the engine's time-dependent thrust and dynamic excitation is presented. Below the flutter speed, at the wing tip and behind the elastic axis, the impulse engine excitation leads to a stable limit cycle oscillation; and for the ramp kind of excitation, beyond the flutter speed, at 75 % span, behind the elastic axis, it produces chaotic oscillation in the wing. Both the excitations above the flutter speed are stabilized, inboard of the wing.
- Subjects
FLUTTER (Aerodynamics); ENGINE maintenance &; repair; KINETIC energy; MECHANICAL oscillations; AEROELASTICITY; TIME-dependent density functional theory
- Publication
Nonlinear Dynamics, 2014, Vol 75, Issue 3, p475
- ISSN
0924-090X
- Publication type
Article
- DOI
10.1007/s11071-013-1079-1