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 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
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
  Filename       Size       Approximate Download Time (Hours:Minutes:Seconds) 
 
 28.8 Modem   56K Modem   ISDN (64 Kb)   ISDN (128 Kb)   Higher-speed Access 
  Na_chapt1.pdf 20.70 Kb 00:00:05 00:00:02 00:00:02 00:00:01 < 00:00:01
  Na_chapt2.pdf 74.89 Kb 00:00:20 00:00:10 00:00:09 00:00:04 < 00:00:01
  Na_chapt3.pdf 89.62 Kb 00:00:24 00:00:12 00:00:11 00:00:05 < 00:00:01
  Na_chapt4.pdf 91.23 Kb 00:00:25 00:00:13 00:00:11 00:00:05 < 00:00:01
  Na_chapt5_I.pdf 47.42 Kb 00:00:13 00:00:06 00:00:05 00:00:02 < 00:00:01
  Na_chapt5_II.pdf 543.32 Kb 00:02:30 00:01:17 00:01:07 00:00:33 00:00:02
  Na_chapt6.pdf 139.45 Kb 00:00:38 00:00:19 00:00:17 00:00:08 < 00:00:01
  Na_HEADINGS.pdf 19.15 Kb 00:00:05 00:00:02 00:00:02 00:00:01 < 00:00:01
  Na_tail.pdf 54.62 Kb 00:00:15 00:00:07 00:00:06 00:00:03 < 00:00:01
  Na_title.pdf 2.06 Kb < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01

Browse All Available ETDs by ( Author | Department )

dla home
etds imagebase journals news ereserve special collections
virgnia tech home contact dla university libraries

If you have questions or technical problems, please Contact DLA.