We experimentally demonstrate temporal pumping of elastic waves in an electromechanical waveguide. An aluminum beam covered by array piezoelectric patches connected to shunt circuits with controllable resistances enables the spatial and control beam's stiffness. The modulation produces non-trivial edge states, while a smooth variation phase drives transfer states from one boundary waveguide oth...

Four arrays of three MFC patches, glued onto a rotating shaft, were compared in laboratory research. The first array was based on delta circuit and equipped with one three-phase rectifier; the second star third parallel connection full-bridge rectifiers; fourth series rectifiers. generated highest value maximal electric power comparison to rest arrays. It experimentally observed that or circuit...

A smart-skin antenna structure is investigated for active flutter control with piezoelectric sensors and actuators. The skin designed as a multilayer sandwich dielectric polymer to perform the role of or radar structures. governing equations are developed according first-order shear deformation theory, von Karman strain–displacement relationships used moderate geometrical nonlinearity. To consi...

piezoelectric nanobeams having circular, rectangular and hexagonal cross-sections are synthesized and used in various nano structures; however, piezoelectric nanobeams with hexagonal cross-sections have not been studied in detail. in particular, the physical mechanisms of the surface effect and the role of surface stress, surface elasticity and surface piezoelectricity have not been discussed t...

In this study, a modified disk-shaped multiple-output piezoelectric transformer operated at the fundamental radial vibration mode has been presented. A derived equivalent circuit for the multioutput piezoelectric transformer was used to analyze the performance. Two piezoelectric transformers, a symmetrically electroded piezoelectric transformer with dual outputs and an asymmetrically electroded...

in this paper the active vibration control of a four-story shear frame instrumented with piezoelectric actuators is presented. the piezoelectric actuators are hosted on the columns in two manners and the produced controlling forces by actuators are considered in the equation of motion. the smart structure modeling and control design is carried out using matlab software in state space form. subs...

Submerged structures that operate under extreme flows are prone to suffer large scale cavitation attached to their surfaces. Under such conditions the added mass effects differ from the expected ones in pure liquids. Moreover, the existence of small gaps between the structure and surrounding bodies filled with fluid also influence the dynamic response. A series of experiments and numerical simu...

We study transient ®nite deformations of a neoHookean beam or plate with piezoelectric (PZT) patches bonded to its upper and lower surfaces. The constitutive relations for the PZTs are taken to be linear in the Green-Lagrange strain tensor but quadratic in the driving voltage. A ®nite element code using 8-noded brick elements has been developed and validated by comparing computed results with e...

We analyze active constrained layer damping (ACLD) of functionally graded (FG) shells under a thermal environment using vertically and obliquely reinforced 1–3 piezocomposites (PZCs) and investigate the performance of PZCs as materials for the constraining layer of the ACLD treatment. The shell’s deformations are analyzed by using a modified first-order shear deformation theory and the finite e...