Active vibration control of smart structures

Ülker, Demet Fatma
The purpose of this thesis was to design controllers by using H^ and yn 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 fin. They were aluminum passive structures with surface bonded PZT (Lead-Zirconate-Titanate) patches. The structures were considered in clamped-free configuration. The first part of this study focused on the identification of nominal system models of the smart structures from the experimental data. For the experimentally identified models the robust controllers were designed by using H^, and ^-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 different experimental set-ups. In the first 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 first two flexural modes of the smart beam were successfully controlled by using Hoo method. The vibrations of the first two flexural and first torsional modes of the smart fin were suppressed through the ^-synthesis. Satisfactory attenuation levels were achieved for both strain measurement and displacement measurement applications.


Active neuro-adaptive vibration suppression of a smart beam
Akin, Onur; Şahin, Melin (2017-12-01)
In this research, 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. Firstly, 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 frequenc...
Active vibration control of a smart beam : a spatial approach
Kırcalı, Ömer Faruk; Yaman, Yavuz; Department of Aerospace Engineering (2006)
This study presented the design and implementation of a spatial Hinf controller to suppress the free and forced vibrations of a cantilevered smart beam. The smart beam consists of a passive aluminum beam with surface bonded PZT (Lead-Zirconate-Titanate) patches. In this study, the PZT patches were used as the actuators and a laser displacement sensor was used as the sensor. In the first part of the study, the modeling of the smart beam by the assumed-modes method was conducted. The model correction techniqu...
Application of Hinf Active Vibration Control Strategy in Smart Structures
Yaman, Yavuz; Volkan, Nalbantoğlu; Tarkan, Çalışkan; Eswar, Prasad; Davıd, Waechter; Bın, Yan (2003-07-01)
In this study, H∞ controllers were designed and implemented on a smart beam. The smart beam consisted of an aluminum beam modeled in cantilevered configuration with eight surface bonded piezoelectric lead-zirconatetitanate (PZT) patches. The study used ANSYS® (v5.6) for the structural modeling of the smart beam. The system models were obtained through the system identification made on the experimental beam data. The H∞ active vibration controllers, which effectively suppressed the sinusoidally excited, in-v...
Thermal imaging based on mechanical vibrations
Yılmaz, Şener; Azgın, Kıvanç; Department of Mechanical Engineering (2022-8-19)
The thesis proposes a digital, resonance readout method based on a lock-in based digital phase locked loop (DPLL) mechanism, which is designed, simulated, implemented and tested using a Xilinx made Field Programmable Gate Array (FPGA). Implementation is performed using a hardware descriptive language (VHDL) on low level. Certain digital signal processing algorithms such as lock-in detection, DPLL, DDS and CORDIC are implemented, simulated and tested. Moreover, the design is shown to be capable of resonating...
Active Vibration Suppression of a Smart Beam by Using an LQG Control Algorithm
Onat, Cem; Şahin, Melin; Yaman, Yavuz (2011-06-22)
The aim of this study was to design and experimentally apply a Linear Quadratic Gaussian (LQG) controller for the active vibration suppression of a smart beam. The smart beam was a cantilever aluminum beam with eight symmetrically located surface-bonded PZT (Lead-Zirconate-Titanate) patches which were utilized both as sensor or actuator depending on their location. A group of PZT patches closed to the root of the beam was used as actuators in the bimorph configuration and a single patch was nominated as a s...
Citation Formats
D. F. Ülker, “Active vibration control of smart structures,” M.S. - Master of Science, Middle East Technical University, 2003.