The purpose of this thesis was to design controllers by using H1 and ¹ / 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 ¯ / n. They were aluminum passive
structures with surface bonded PZT (Lead-Zirconate-Titanate) patches. The structures were
considered in clamped-free con¯ / guration.
The ¯ / rst part of this study focused on the identi¯ / cation of nominal system models of the
smart structures from the experimental data. For the experimentally identi¯ / ed models the
robust controllers were designed by using H1 and ¹ / -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® / erent experimental set-ups. In the ¯ / 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 ¯ / rst two ° / exural modes of the smart beam were successfully controlled by using
H1 method. The vibrations of the ¯ / rst two ° / exural and ¯ / rst torsional modes of the smart
¯ / n were suppressed through the ¹ / -synthesis. Satisfactory attenuation levels were achieved for
both strain measurement and displacement measurement applications.
| Identifer | oai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/4/1098409/index.pdf |
| Date | 01 January 2003 |
| Creators | Ulker, Fatma Demet |
| Contributors | Yaman, Yavuz |
| Publisher | METU |
| Source Sets | Middle East Technical Univ. |
| Language | English |
| Detected Language | English |
| Type | M.S. Thesis |
| Format | text/pdf |
| Rights | To liberate the content for public access |
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