000013110 001__ 13110
000013110 005__ 20161114160327.0
000013110 04107 $$aeng
000013110 046__ $$k2009-06-22
000013110 100__ $$aZehetner, C.
000013110 24500 $$aControl of torsional vibrations by piezoelectric sensors and actuators

000013110 24630 $$n2.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000013110 260__ $$bNational Technical University of Athens, 2009
000013110 506__ $$arestricted
000013110 520__ $$2eng$$aThis paper concerns the control of torsional vibrations of laminated rods with solid cross-sections by piezoelectric sensors and actuators. Exemplarily, a rod clamped at one end and subjected to a torque at the other end is considered. Utilizing the direct piezoelectric effect, a piezoelectric layer can be used as a sensor. Measuring either the electrical potential or the charge of the electrodes on a piezoelectric layer, the torsional angle can be identified. On the other hand, the converse piezoelectric effect can be utilized for piezoelectric actuation. Prescribing an electric potential at the electrodes yields an actuating torsional moment. Based on a refinement of Saint Venant's theory of torsion, which considers the influence of piezoelectric strains on the cross-sectional warping, the sensor and actuator equations are formulated. The results are verified by means of three-dimensional Finite Element computation showing good coincidence with rod theory. Two control strategies are investigated. In the first step, a feed-forward shape control solution is presented: Assuming that the external excitation is known, the actuating moment is computed in order to completely compensate the torsional vibrations. In the second step, it is assumed that the time-response of the tip torque is not known. Using a piezoelectric layer as a sensor to measure the torsional angle, a feedback control algorithm is implemented. Numerical simulations show that a significant reduction of torsional vibrations can be achieved by the proposed control strategy.

000013110 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000013110 653__ $$arods, torsional vibrations, warping, piezoelectric sensors and actuators, active control. Abstract. This paper concerns the control of torsional vibrations of laminated rods with solid cross-sections by piezoelectric sensors and actuators. Exemplarily, a rod clamped at one end and subjected to a torque at the other end is considered. Utilizing the direct piezoelectric effect, a piezoelectric layer can be used as a sensor. Measuring either the electrical potential or the charge of the electrodes on a piezoelectric layer, the torsional angle can be identified. On the other hand, the converse piezoelectric effect can be utilized for piezoelectric actuation. Prescribing an electric potential at the electrodes yields an actuating torsional moment. Based on a refinement of Saint Venant's theory of torsion, which considers the influence of piezoelectric strains on the cross-sectional warping, the sensor and actuator equations are formulated. The results are verified by means of three-dimensional Finite Element computation showing good coincidence with rod theory. Two control strategies are investigated. In the first step, a feed-forward shape control solution is presented: Assuming that the external excitation is known, the actuating moment is computed in order to completely compensate the torsional vibrations. In the second step, it is assumed that the time-response of the tip torque is not known. Using a piezoelectric layer as a sensor to measure the torsional angle, a feedback control algorithm is implemented. Numerical simulations show that a significant reduction of torsional vibrations can be achieved by the proposed control strategy.

000013110 7112_ $$aCOMPDYN 2009 - 2nd International Thematic Conference$$cIsland of Rhodes (GR)$$d2009-06-22 / 2009-06-24$$gCOMPDYN2009
000013110 720__ $$aZehetner, C.$$iKrommer, M.
000013110 8560_ $$ffischerc@itam.cas.cz
000013110 8564_ $$s264061$$uhttps://invenio.itam.cas.cz/record/13110/files/CD146.pdf$$yOriginal version of the author's contribution as presented on CD, section: Advances in structural vibrations - ii (MS).
000013110 962__ $$r13074
000013110 980__ $$aPAPER