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Effectivity of Piezoelectric Transition Elements in Modelling of Electro-Mechanical Systems

Abstract

The paper presents the coupled electro-mechanical problem. In the numerical analysis of the issue, piezoelectric solid-to-shell transition elements were applied. They combine three-dimensional or hierarchical shell piezoelectric elements with piezoelectric first order elements. The mentioned first order of the element refers to the field of transversal displacements of an element. The mechanical field of the discussed piezoelectric elements may correspond to: the model of three-dimensional theory of elasticity, hierarchical shell models of higher orders or the first order shell model. The electrical field of the potential may be modelled with hierarchical dielectric first order models or higher in transverse direction or with a three-dimensional theory. Effectiveness of modification of algorithms of classical piezoelectric elements was assessed in this paper. To perform such an assessment, curves of convergence of hp method in model tasks are presented. Curves obtained with the use of classical and modified piezoelectric transition elements were set and compared.

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Detection of Damages in Hybrid Composite Plates with the Use of Elastic Waves Generated by PZT Active Sensors

Abstract

The presented article is devoted to the problem of detection and localization of damages occurring in components of structures, which are made of hybrid composite materials. The subject of the work is a square plate consisting of a single layer made of aluminum alloy and several layers made of glass fibres (glass fabric) and epoxy resin. On the surface, which is made of composite, 12 piezoelectric elements are installed. These elements sequentially, one by one, generates a signal that is further recorded by the remaining piezoelectric elements. Picked up signal for the selected pair of activator – sensor is compared with the reference signal. The reference signal corresponds to the intact structure. This kind of approach is known as the pitch – catch configuration. In situations when the signal obtained for interrogated structure and reference one differs significantly, this may indicate that a damage exists between the activator and the sensor. Next, taking into account the information obtained from the other sensors, it is possible not only to detect but also to determine the approximate location of the flaw and to estimate its size. In order to visualize the obtained results, an especially dedicated software is developed according to the algorithms available in the literature – probability ellipse. Several computer simulations of wave propagation are performed using the finite element method. The proposed procedure is also tested experimentally. The presented approach makes it possible to detect both single and multiple damages.

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Static Electromechanical Characteristics of Piezoelectric Converters with various Thickness and Length of Piezoelectric Layers

-Layer Piezoelectric Transducers, Mechanika , 24(3), 335–342. 12. Nguyeni V-T., Kumar P., Leong J.Y.C. (2018), Finite Element Modelling and Simulations of Piezoelectric Actuators Responses with Uncertainty Quantification, Computation, 6(4), 1–20. 13. Park J.K., Moon W.K. (2005), Constitutive relations for piezoelectric benders under various boundary conditions, Sens. Actuat. A , 117, 159–167. 14. Przybyłowicz P.M. (1999), Application of piezoelectric elements to semi-adaptive dynamic eleminator of torsional vibration, Journal of Theoretical and Applied

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Inkjet-printed flexible RFID antenna for UHF RFID transponders

, some aspects connected with investigations into material deposition processes are described. The application of nanomaterials for fabrication of flexible electronic devices in the inkjet printing processes is more complicated than it is in the traditional printing industry, because properties of nanoparticle solutions are different form common inks. Generally, inks are dosed by printing heads with piezoelectric nozzles. The shape, volume and velocity of the drops are formed by electrical impulses that power piezoelectric elements. But the real parameters of the

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