Type of Document Dissertation Author Na, Sungsoo Author's Email Address firstname.lastname@example.org URN etd-11597-144546 Title Control of Dynamic Response of Thin-Walled Composite Beams using Structural Tailoring and Piezoelectric Actuation Degree PhD Department Engineering Science and Mechanics Advisory Committee
Advisor Name Title Librescu, Liviu Committee Chair Hyer, Michael W. Committee Member Inman, Daniel J. Committee Member Renardy, Yuriko Y. Committee Member Keywords
- active control
- thin-walled composite beam
- vibration control
- smart structures
Date of Defense 1997-09-28 Availability unrestricted AbstractA dual approach integrating structural tailoring and adaptive
materials technology and designed to control the dynamic
response of cantilever beams subjected to external excitations
is addressed. The cantilevered structure is modeled as a
thin-walled beam of arbitrary cross-section and incorporates
a number of non-classical effects such as transverse shear,
warping restraint, anisotropy of constituent materials and
heterogeneity of the construction.
Whereas structural tailoring uses the anisotropy properties of
advanced composite materials, adaptive materials technology
exploits the actuating/sensing capabilities of piezoelectric
materials bonded or embedded into the host structure. Various
control laws relating the piezoelectrically-induced bending
moment with combined kinematical variables characterizing
the response at given points of the structure are implemented
and their effects on the closed-loop frequencies and dynamic
response to external excitations are investigated. The combination
of structural tailoring and control by means of adaptive materials
proves very effective in damping out vibration.
In addition, the influence of a number of non-classical effects
characterizing the structural model on the open and closed-loop
dynamic responses have been considered and their roles assessed.
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