Browsing by Subject "piezoelectric"

Now showing 1 - 4 of 4

Access status: Open Access ,
2-DOF piezoelectric actuator controller based on FPGA
(2013) Prusak, Daniel; Karpiel, Grzegorz; Gac, Konrad
This article presents the method for controlling the piezolegs motor with the application of the FPGA (Field-programmable gate array) system and presents the results of conducted tests of the motor slider displacement, with various steering signal configurations. It includes also the review of piezoelectric motors solutions and characteristics of systems, based on FPGA systems. Suggested steering solution can be used for subsequent tests on piezolegs drives and can constitute positioning system element.
Access status: Open Access ,
Development of a new semi-active friction damper using piezoelectric technology for the anti-seismic control of civil structures
(2012) Di Leo, Romeo; Lecce, Leonardo; Pecora, Rosario; Amoroso, Francesco
This work presents a new semi-active friction damper, based on the piezoelectric technology, for the anti-seismic control of a civil structure. The device has been conceived and designed at D.I.A.S. (Department of Aerospace Engineering) of University Federico II of Naples. It belongs to the family of the semi-active technologies of structural control for a civil structure. Damper is based on an external cylinder and an internal hollow piston that slips inside the cylinder. Device presents an original conceptual lay-out, developed at D.I.A.S and it is independent by any scheme, available in literature.
Access status: Open Access ,
LQR control of the nodal displacements in a spatial truss with active piezoelectric members
(2013) Grzybek, Dariusz
The ability to damp vibrations is important in many structures, in which trusses are one of the main elements. The increase of the damping of the truss vibrations is possible by passive means or by the use of an active vibration control system integrated with the structure of the truss. The control system can affect the truss structure by specially designed actuators, which generate active forces in appropriate nodes of the truss. Piezoelectrics can be used to build such actuators. The design of the control system encompasses the structure of the actuating active truss member, the spacing of active members inside the truss structure, the design of the control algorithm and the spacing of measurement sensors generating feedback signals. In this article, the application of the LQR algorithm to the node displacement control in a spatial truss has been presented. The spacing of active members in the truss structure on the basis of the force distribution in the truss members has been suggested.
Access status: Open Access ,
The use of piezoelectric elements to control vibrations of ax SMA material shaft
(Wydawnictwa AGH, 2007) Gałkowski, Zdzisław
In the paper an analysis of the influence of structural friction and piezoelectric elements on damping of torsional vibration in a shaft is presented. The structural friction between the piezoelectric actuators and the shaft is taken into account. It is assumed that the shaft is made of SMA material. A dependency describing the equivalent Kirchhoff modulus and the equivalent viscotic damping coefficient is introduced for the assumed material. For the purpose of the analysis a mathematical model of a permanent shaft-sleeve joint is formulated. The obtained differential equations of motion are solved using the asymptotic Bogoliubov-Krylov-Mitropolsky method via developing relations for derivatives of amplitude and phase. The obtained equations are solved for the case of harmonic excitation with uniformly increasing frequency of the driving torque and the effect of the gain factor magnitude on the damping level is examined. On the grounds of numerical simulations the growth of damping efficiency in the joint as a function of the gain factor is confirmed.