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http://dx.doi.org/10.7234/kscm.2007.20.1.008

Nonlinear Aeroelastic Analyses of Composite Wing with Flap  

Shin, Won-Ho (한국과학기술원 기계항공시스템학부 항공우주공학)
Bae, Jae-Sung (한국항공대학교 항공우주 및 기계공학부)
Lee, In (한국과학기술원 기계공학과 항공우주공학)
Publication Information
Composites Research / v.20, no.1, 2007 , pp. 8-14 More about this Journal
Abstract
Nonlinear aeroelastic analyses of composite wing with flap are performed considering free-play and dynamic stiffness of actuator. Doublet-Hybrid method is used for the calculation of subsonic unsteady aerodynamic forces. Free-play is modeled as a bilinear spring and is linearized by using the describing function method. Dynamic stiffness is obtained from governing equation of gear system and the aeroelastic analyses were performed according to ply-angle of laminate and material. The linear and nonlinear flutter analysis results show that the flutter characteristics are significantly dependent on the free-play and dynamic stiffness. from the nonlinear flutter analysis, various types of limit cycle oscillations are observed in a range of air speeds below or above the linear divergent flutter boundary.
Keywords
flutter; nonlinear aeroelasticity; free-play; dynamic stiffness; limit cycle oscillation;
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