Title page for ETD etd-11597-144546

Type of Document

Dissertation

Author

Na, Sungsoo

Author's Email Address

sna@vt.edu

URN

etd-11597-144546

Title

Control of Dynamic Response of Thin-Walled Composite Beams using Structural Tailoring and Piezoelectric Actuation

Degree

Doctor of Philosophy

Department

Engineering Science and Mechanics

Advisory Committee

Advisor Name	Title
Dr. Liviu Librescu and Dr. Leonard Meirovitch	Committee Chair
Dr. Daniel Inman	Committee Member
Dr. Michael Hyer	Committee Member
Dr. Yuriko Renardy	Committee Member

Keywords

active control
thin-walled composite beam
vibration control
smart structures

Date of Defense

1997-09-28

Availability

unrestricted

Abstract

A 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.

Files

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