كليدواژه :
Incompressible Flow , Theodorson aerodynamic , Instability , ناپايداري
چكيده لاتين :
In this st udy, the in stability boundary of a wing - in th e
incompressible flow regime has been consider ed, using
Pet er ʹs aerodynamics, and compared with the result obtained
from th e Theodorsou aerodynamic. To this aim,
the lift coefficient, based on P et er ʹs theory in the frequen
cy domain , is obtained , at first , for a pure plun ging
motion. Then , real and imaginary parts of the lift and
moment are plotted versus redu ced frequency and compared
with tho se from the Theodorson aerodynami c. It
can be seen th at , with a fewer number of aerodynamic
states in Pet er ʹs th eory (N=5) , th ere will be good agreement
between the two theories. In addit ion, equa tions
corre sponding to mass, stiffn ess and damping matrices
from Pet er ʹs th eory have been obtaiu ed. To do thi s, two
models, including a typical sect ion and beam, are used
for st ructural modeling. Finally, the flutter boundary is
det ermined using p - k and p methods and the results
compared with those from the Theodorson aerodynamic.
Results show good agreement between th e two theories
