F. Lalande et al., IMPEDANCE-BASED MODELING OF INDUCED STRAIN ACTUATORS BONDED ON RING STRUCTURES, Journal of sound and vibration, 201(2), 1997, pp. 169-187
An impedance-based model to describe the in-phase, out-of-phase and un
symmetric actuation of induced strain actuators bonded to the surface
of a circular ring has been developed. The essence of the impedance ap
proach is to match the actuator impedance with the structural impedanc
e at the ends of the actuators, which includes the dynamic effects of
the system. In the model derivation, the dynamics of the ring are base
d on the Rayleigh-Ritz method. The appropriate representation of the l
oading due to induced strain actuation is discussed. The in-phase and
out-of-phase actuation authority is compared. It is shown that out-of-
phase actuation has higher authority in exciting the lower order bendi
ng modes, while in-phase actuation has higher authority in exciting th
e higher order circumferential modes. In-phase actuation does excite t
he lower order bending modes through the in-plane and out-of-plane dis
placement coupling, but with an order of magnitude lower than out-of-p
hase actuation. A good correlation between the dynamic finite element
analysis using piezoelectric elements available in ANSYS 5.0 is found.
Experimental results of a circular ring actuated in-phase and out-of-
phase are also presented. Different methods of bonding straight actuat
ors on curved surfaces are investigated. Experimental verification of
the impedance-based models is conclusive, particularly for the out-of-
phase actuation. (C) 1997 Academic Press Limited.