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Active Vibration Control Of Smart Structures

The purpose of this thesis was to design controllers by using H1 and &sup1 / control strategies
in order to suppress the free and forced vibrations of smart structures. The smart structures
analyzed in this study were the smart beam and the smart &macr / n. They were aluminum passive
structures with surface bonded PZT (Lead-Zirconate-Titanate) patches. The structures were
considered in clamped-free con&macr / guration.
The &macr / rst part of this study focused on the identi&macr / cation of nominal system models of the
smart structures from the experimental data. For the experimentally identi&macr / ed models the
robust controllers were designed by using H1 and &sup1 / -synthesis strategies. In the second part,
the controller implementation was carried out for the suppression of free and forced vibrations
of the smart structures.
Within the framework of this study, a Smart Structures Laboratory was established in the
Aerospace Engineering Department of METU. The controller implementations were carried out
by considering two di&reg / erent experimental set-ups. In the &macr / rst set-up the controller designs were based on the strain measurements. In the second approach, the displacement measurements,
which were acquired through laser displacement sensor, were considered in the controller design.
The &macr / rst two &deg / exural modes of the smart beam were successfully controlled by using
H1 method. The vibrations of the &macr / rst two &deg / exural and &macr / rst torsional modes of the smart
&macr / n were suppressed through the &sup1 / -synthesis. Satisfactory attenuation levels were achieved for
both strain measurement and displacement measurement applications.

Identiferoai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/4/1098409/index.pdf
Date01 January 2003
CreatorsUlker, Fatma Demet
ContributorsYaman, Yavuz
PublisherMETU
Source SetsMiddle East Technical Univ.
LanguageEnglish
Detected LanguageEnglish
TypeM.S. Thesis
Formattext/pdf
RightsTo liberate the content for public access

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