Accession Number : ADA251863


Title :   Optimum Aeroelastic Characteristics for Composite Supermaneuverable Aircraft


Descriptive Note : Final technical rept. Sep 1989-Oct 1991


Corporate Author : POLYTECHNIC UNIV FARMINGDALE NY DEPT OF AEROSPACE ENGINEERING


Personal Author(s) : Oyibo, Gabriel A ; Bentson, James ; Weisshaar, T A


Full Text : http://www.dtic.mil/dtic/tr/fulltext/u2/a251863.pdf


Report Date : 28 Dec 1991


Pagination or Media Count : 143


Abstract : The investigation of an aeroelastically induced constrained warping phenomenon for a composite, supermaneuverable type aircraft wing has continued in this second phase of the study. The first phase investigation was concentrated mainly on the static phenomena and the search for closed form solutions for free vibration of aircraft wings having constrained warping in the presence of elastic coupling. The wing is analytically modelled as a straight flat laminated plate. Various forms of highly simplified aerodynamic loads are employed in the analysis. The free vibrations and stability aspects of this phenomenon are examined to obtain some physical insights and to determine its importance and/or design implications. Analytical tools employed include and affine transformation concept which was formulated previously. An evolution of effective warping parameters with which to study this phenomenon was carried out. The virtual work theorem and variational principles were used to derive the equations of motion based on the assumed wing displacements. The existence of closed-form free vibrations solutions for composite wings with elastic coupling and constraint of warping was established. A revelation from these closed-form solutions is that elastic coupling lowers the first coupled frequencies.


Descriptors :   *AEROELASTICITY , *COMPOSITE WINGS , *COMPOSITE MATERIALS , *AERODYNAMIC LOADING , *MANEUVERABILITY , PLATES , AERODYNAMIC CHARACTERISTICS , FLUTTER , CANTILEVER BEAMS , DISPLACEMENT , LAMINATES , AIRCRAFT , EQUATIONS OF MOTION , VIBRATION , ELASTIC PROPERTIES


Subject Categories : Aerodynamics
      Aircraft
      Laminates and Composite Materials


Distribution Statement : APPROVED FOR PUBLIC RELEASE