Smart structures become highly popular with the developing technology. The aim of this study is to develop a basic model, which can be also used in the design of more complex systems by performing simultaneous optimization of a structure and associated controller with respect to some design parameters and feedback gains.
In this thesis work, two smart structures are used as case studies and their results are compared with the available results in the literature. The first case study is simple twobar
truss problem controlled by either one or two actuators. This problem is solved both numerically and analytically. The latter is a twenty-element parabolic truss, which is controlled by four actuators. This problem is solved numerically only.
In the optimization process, the design parameters are taken as the cross sectional areas of bar elements, positions and/or number of actuators, and the elements of closed loop gain matrix. In the second case study, in addition to these parameters, shape design parameters are also optimized.
A coordinate transformation is applied in both cases from the displacement space to the modal space. The modal model reduction method is used in the design of second problem.
The optimization goal in both cases studies is to minimize the system energy while satisfying some frequency and mass constraints. In the second case study, in addition
to the original objective function, system controllability and stability robustness are also maximized.
In the solution of design problem, two optimization algorithms are used one embedded within the other. In the outer loop, a hide and seek simulated annealing algorithm optimizes structural design parameters, and positions and/or number of
actuators. In order to generate a candidate design family for this level, optimal closed loop gain matrices are calculated by using MATLAB® / .
| Identifer | oai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/12605613/index.pdf |
| Date | 01 December 2003 |
| Creators | Akgoz, Asli |
| Contributors | Balkan, Tuna |
| 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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