000			03538nam a2200433 4500
005			20260817161500.0
008			150798 th eng
035			_a.b10053360
099		9	_aAIT Thesis no. ST-93-01
100	1		_aArfiadi, Yoyong
245	1	0	_aActive vibration control of structures by piezoelectric actuators
260			_aBangkok : _bAsian Institute of Technology, _c1993
300			_a50 leaves
490	1		_aThesis ; _vno. ST-93-01
500			_aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Civil Engineering
502			_aThesis (M.Eng.) - Asian Institute of Technology, 1993
520			_aIn this study the governing equation of motion for beam structure with integrated piezoelectric actuator was formulated from the virtual work principle. The resulting governing equations are expressed in the form of ordinary differential equations in modal coordinates, where the effect of the electrically-induced strain in the actuator is shown in term of modal force. In the formulation, transverse motion as well as axial motion of the beam structure were considered. A simple beam with a direct feedback control was then studied. The feedback signal is proportional to the time rate of change in the dynamic strain at the extreme fiber of the beam nearest the actuator. This feedback introduces not only active damping to every vibrational mode, but also coupling between modes; these effects were represented in terms of a non-proportional active damping matrix. Therefore, complex modal analysis is needed to compute complex modes and complex eigenfrequencies of the system. The complex eigenfrequencies are then transformed into the equivalent modal dampings and modal frequencies. It was found that the relation between modal dampings and feedback gain is not linear; the damping increases, reaches its maximum, and then decreases when the gain is monotonically increased. Such a nonlinear phenomenon can not be identified if the coupling between modes is neglected. The phenomenon also implies that there is a physical limitation on the effectiveness of the active control scheme.
650		0	_aStructural dynamics
650		0	_aPiezoelectric devices
700	0		_aPennung Warnitchai, _eChairperson
700	1		_aAoyagi, Yukio, _eExamination Committee
700	0		_aWorsak Kanok-Nukulchai, _eExamination Committee
710	2		_aSlamet Rijadi Foundation Yogyakruta, Indonesia, _eScholarship Donor
710	2		_aCanadian International Development Agency, _eScholarship Donor
810	2		_aAsian Institute of Technology. _tThesis ; _vno. ST-93-01
856			_3Full-Text _uhttp://203.159.5.9/ait-thesis/detail.php?q=B16422
907			_a.b10053360 _bmnait _cs
902			_a240409
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