Active neuro-adaptive control of a smart beam having uncertainties in structural dynamics

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2015

Author

Akın, Onur

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In this thesis, an active vibration suppression of a smart beam having piezoelectric sensor and actuators is investigated by designing separate controllers comprising a linear quadratic regulator and a neural network. At first, design of a smart beam which consists of a cantilever aluminum beam with surface bonded piezoelectric patches and a designed mechanism having a micro servomotor with a mass attached arm for obtaining variations in the frequency response function are presented. Secondly, the frequency response functions of the smart beam are investigated experimentally by using different piezoelectric patch combinations and the analytical models of the smart beam around its first resonance frequency region for various servomotor arm angle configurations are also obtained. Then, a linear quadratic regulator controller is designed and used to simulate the suppression of free and forced vibrations which are performed both in time and frequency domain. Parallel to simulations, experiments are conducted to observe the closed loop behavior of the smart beam and the results are compared as well. Finally, active vibration suppression of the smart beam is investigated by using a linear controller with a neural network based adaptive element which is designed for the purpose of overcoming the undesired consequences due to variations in the real system. This thesis study shows that sufficient vibration suppression levels are reached in the smart beam structure through linear quadratic regulator and an artificial neural network based control algorithms via piezoelectric sensor and actuators in the cases where there are some variations in the frequency response function of the structure around its first resonance frequency region.

Subject Keywords

Piezoelectric materials., Structural Dynamics., Girders., Vibration.

URI

http://etd.lib.metu.edu.tr/upload/12619246/index.pdf
https://hdl.handle.net/11511/24940

Collections

Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

O. Akın, “Active neuro-adaptive control of a smart beam having uncertainties in structural dynamics,” M.S. - Master of Science, Middle East Technical University, 2015.