I. Kaljevic et Da. Saravanos, STEADY-STATE RESPONSE OF ACOUSTIC CAVITIES BOUNDED BY PIEZOELECTRIC COMPOSITE SHELL STRUCTURES, Journal of sound and vibration, 204(3), 1997, pp. 459-476
A formulation to calculate the coupled response of composite shells wi
th embedded piezoelectric layers and an enclosed acoustic fluid is pre
sented in this paper. The methodology consists of three parts: (1) a f
ormulation for the electro-mechanical response of piezoelectric shells
; (2) a formulation for the three-dimensional acoustic response of the
enclosed fluid; and (3) the combination of the formulations (1) and (
2) to calculate the coupled smart structure-acoustic fluid response. A
recently developed mixed field laminate theory is adapted for the ana
lysis of piezoelectric shells. The theory combines the first order she
ar theory kinematic assumptions with a layer-wise approximation for th
e electric potential. Shell geometry is described in an orthogonal cur
vilinear co-ordinate system and general piezoelectric material descrip
tions and laminate configurations are considered. A boundary element f
ormulation is developed to calculate the acoustic response of the encl
osed fluid. Quadratic conforming boundary elements are used to discret
ize the fluid boundary. Advanced numerical integration techniques are
employed to calculate singular elements in boundary element matrices.
The treatment of distributed acoustic sources is also presented. A for
mulation to calculate the coupled fluid-structure response is also dev
eloped. Relations between the structural and acoustic variables on the
structure-fluid interface are utilized to generate the coupled system
of equations in terms of the kinematic shell variables and acoustic p
ressures on the fluid boundary. The convergence of the present develop
ments is established by studying a circular cylindrical shell with an
attached piezoelectric layer. The coupled response is investigated for
various types of mechanical loads and active voltage patterns. (C) 19
97 Academic Press Limited.