Considerable attention has been devoted to active vibration control using intelligent materials as PZT actuators. This paper presents results on active control schemes for vibration suppression of flexible steel cantilever beam with bonded piezoelectric actuators. The PZT patches are surface bonded near the fixed end of flexible steel cantilever beam. The dynamic model of the flexible steel can...

This paper proposes an on-line self-organizing fuzzy logic controller (FLC) design applied to the control of vibrations in flexible structures containing distributed piezoelectric actuator patches. In this methodology, the fuzzy rules are generated using the history of input/output (I/O) pairs without using any plant model. The generated rules are stored in the fuzzy rule space and updated on-l...

Vibration energy harvesting with piezoelectric materials currently generate up to 300 microwatts per cm2, using it to be mooted as an appropriate method of energy harvesting for powering low-power electronics. One of the important problems in bimorph piezoelectric energy harvesting is the generation of the highest power with the lowest weight. In this paper the effect of the shape and geometry ...

in this paper, load and buckling mode of a smart column are presented. the theoretical model is a three-layer piezoelectric composite beam that behaves as an axial actuating mechanism. this actuator consists of an elastic core sandwiched between two piezoelectric active outer layers. the piezoelectric layers are polarized transversely, i.e., the polarization vector is parallel to the applied el...

nowadays, atomic force microscope is considered as a useful tool in the determination of intermolecular forces and surface topography with the resolution of nanometers. in this kind of microscope, micro cantilever is considered as the heart of the microscope and is used as a measuring tool.  this paper is aimed towards investigating the behavior of a piezoelectric micro cantilever with a triang...

Recently, the nanogenerators which can convert the mechanical energy into electricity by using piezoelectric materials have exhibited great potential in microscale power supply and sensor systems. In this paper, i provide a comprehensive review of the research progress in piezoelectric nanogenerators with different material. The fundamental piezoelectric theory and typical piezoelectric materia...

The aim of this paper is to present a CAE methodology for simulating coupled vibro-acoustic systems and include these models into a closed loop control simulation. This tool provides a reliable simulation procedure that takes into account the vibro-acoustic phenomena as well as the control system since sensors/actuators models and the control algorithms can be included. The focus of the present...

Abstract The linear stability of a piezo-electro-mechanical (PEM) system subject to follower force is here discussed. mechanical subsystem constituted by visco-elastic cantilever beam, loaded at the free end. It suffers from Hopf bifurcation, whose critical load strongly affected damping, according well-known Ziegler’s paradox. On other hand, electrical consists distributed array piezoelectric ...

Flexure mechanisms are widely used in precision applications. The finite support stiffness results parasitic resonance frequencies, typically with low damping, that can be detrimental for positioning performance. Moreover, these resonances may vary over the workspace moderate or large deflection. In this paper we consider a model of stroke flexure hinge requires accurate end-effector positionin...

a solution to the problem of identification and control of smart structures is presented in this paper. smart structures with build-in sensors and actuators can actively and adaptively change their physical geometry and properties. as a particular example, a representative dynamic model of a typical fighter vertical tail, identified as the smart fin, is considered. piezoelectric patches, which ...