Investigation of Torsion Free Wing Trend Flutter Models.
Final rept. 1 Feb 77-31 Aug 78,
PURDUE UNIV LAFAYETTE IND SCHOOL OF AERONAUTICS AND ASTRONAUTICS
Pagination or Media Count:
Four types of aluminum plate flutter models of a torsion free wing TFW were studied 1 cantilever wing 2 pitch restrained wing 3 TFW with forward trim surface and 4 TFW with aft trim surface. Models 3 and 4 included the effect of fuselage. Free vibration analyses were performed by using the finite element program NASTRAN. Generalized aerodynamic forces were computed by using the program LAT2D based on the subsonic lifting surface theory of Kussner. Flutter speeds and frequencies were predicted by using the program FLTTR based on the V-g method. The predicted flutter speeds were compared with available computed and tested results. The predicted flutter speeds for the four models were compared with each other and conclusions were made. To determine the designs that yielded higher flutter speeds, parametric studies were conducted by varying each of the six parameters thickness parameter of the wing thickness parameter of either trim surface location of the wing pivot length of the boom swept angle of the wing and swept angle of either trim surface. The effect of these parameters on the flutter speeds of models 3 and 4 were plotted as trend curves and discussions and conclusions were made. Author
- Fluid Mechanics