NONLINEAR BEHAVIOR OF A TYPICAL AIRFOIL SECTION WITH CONTROL SURFACE FREEPLAY: A NUMERICAL AND EXPERIMENTAL STUDY
✍ Scribed by M.D. Conner; D.M. Tang; E.H. Dowell; L.N. Virgin
- Publisher
- Elsevier Science
- Year
- 1997
- Tongue
- English
- Weight
- 494 KB
- Volume
- 11
- Category
- Article
- ISSN
- 0889-9746
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✦ Synopsis
A three degree-of-freedom aeroelastic typical section with control surface freeplay is modeled theoretically as a system of piecewise linear state-space models . The system response is determined by time marching of the governing equations using a standard Runge -Kutta algorithm in conjunction with He ´ non's method for integrating a system of equations to a prescribed surface of phase space section . He ´ non's method is used to locate the ''switching points'' accurately and ef ficiently as the system moves from one linear region into another . An experimental model which closely approximates the three degree-of-freedom typical section in two-dimensional , incompressible flow has been created to validate the theoretical model . Consideration is given to modeling realistically the structural damping present in the experimental system . The ef fect of the freeplay on the system response is examined numerically and experimentally . The development of the state -space model of fers a low-order , computationally ef ficient means of modeling fully the freeplay nonlinearity and may of fer advantages in future research which will investigate the ef fects of freeplay on the control of flutter in the typical section .