الفهرس 
FUNDAMENTAL EQUATIONSOnly 14 pages are availabe for public view
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Abstract
An extensive investigation is carried out to study the
dynamic characteristics of orthotropic ring sectorial plates,
with variable stiffness in the radial direction. The plates are
assumed to be simply supported alonQ the radial edges. Four
Qltferent combination~ of boundary conditions, at the circumfer-
ential edges, are considered. Along the radial edges, the plates
are assumed to be simply supported.
The governing differential eQuation of free vibration, in
the lateral direction is formulated in terms of the vertical
deflection. The resulting equation, is a fourth order partial
differential equation, with variable coefficients. This equation
is reduced to a set of algebra~c equations, using the finite
difference method. The solution of these equations, represent an
e igen-value problem, in which, the’ e Igen-values represent .the
represent the mode
natural frequencies and the eigen-vectors.
IShapes.
Numerical re.ults are obtained for 80me typical’ ring
sectorial plates, to examine the accuracy and convergence chara-
cteristics of the numerical solution.