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1

An experimental and theoretical piezoelectric energy harvesting from a simply supported beam with moving mass

Mohaisen A. M., Ntayeesh T. J.

Archives of Materials Science and Engineering

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2023

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Vol. 123, nr 1

13--29

EN

Purpose: The feasibility of harvesting electrical energy from mechanical vibration is demonstrated in the thesis. In the technique, energy is harvested from simply supported beam vibration under a moving mass using a thin piezoelectric material. Design/methodology/approach: The structure is represented by a basic beam of length L that is supported at both ends and traversed by a moving mass M travelling at a constant velocity v. The Euler-Bernoulli differential equation describes its behaviour. The dynamic analysis of a beam is performed by using three moving masses of (35.61, 65.81, and 79.41) gr each travelling three uniform speeds of (1.6, 2 and 2.4) m/s. A differential equation of the electromechanical system is obtained by transforming the piezoelectric constitutive equation and solved numerically by MATLAB. Findings: The results indicate that the numerical and experimental values for the midpoint deflection of the beam and the piezoelectric voltage are very close. Research limitations/implications: Using the COMSOL programme, the proposed approach is checked by comparing results with data obtained by the finite element method (FEM). An experimental setup was also built and constructed to determine the voltage created by the piezoelectric patch and the beam response as a result of the mass travelling along the beam. Practical implications: The results show that the dynamic deflection, piezoelectric voltage, and piezoelectric energy harvesting all increase as the speed and magnitude of the moving mass increase. The harvesting power vs. load resistance curve begins at zero, increases to a maximum value, and then remains almost constant as the resistance is increased further. The optimal length of the piezoelectric patch was obtained to be 0.63 m. When the length of the beam increases, the resonant frequency decreases, and at the same time the harvested energy increases. However, increasing the beam thickness has the opposite effect; whereas raising the beam width does not affect the resonant frequency but decreases energy harvesting. Originality/value: The most essential point here is the need to have correctly built scale models. They can provide a substantial amount of information at a low cost, accommodate a variety of test settings, and aid in the selection and verification of the most effective analytical model to resolve the actual issue.

2

Zmiany rozkładu efektywnej gęstości ładunku powierzchniowego w modelowej wnęce gazowej

Żyłka Paweł

Przegląd Elektrotechniczny

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2022

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R. 98, nr 10

144--147

PL

Wyładowania barierowe prowadzące do przebicia cienkiej przerwy gazowej w dielektryku są wykorzystywane m.in. do tworzenia struktur makrodipolowych w ferroelektretach komórkowych W artykule omówiono rezultaty doświadczalnej analizy zmian rozkładu efektywnej gęstości ładunku powierzchniowego na ścianie modelowej wnęki gazowej (odwzorowującej przerwy gazowe w jednowarstwowym ferroelektrecie) w zależności od napięcia polaryzacji. Badaniom poddano wnękę atmosferyczną o wysokości 100 μm utworzoną z 3 warstw folii poliestrowej PET, polaryzowaną napięciem stałym w zakresie 0-5 kV. Ewolucja uzyskanych rozkładów efektywnej gęstości ładunku powierzchniowego jak i średniej efektywnej gęstości ładunku powierzchniowego są jakościowo zgodne z literaturową zależnością współczynnika piezoelektrycznego jednowarstwowego ferroelektretu od napięcia polaryzacji.

EN

Barrier discharges leading to the breakdown of a thin gas gap in a dielectric are used to produce macrodipole structures in cellular ferroelectrets. The paper discusses the results of experimental analysis of the distribution of the effective density of the surface charge on the wall of the model gas cavity (mapping gas gaps in a single-layer ferroelectret) and its dependency on the polarization voltage, The tests were carried out using 100 μm high atmospheric cavity formed from 3 layers of PET polyester film, polarized using 0-5 kV DC voltage. Evolution of the obtained distribution of the effective density of the surface charge as well as the changes in the average effective density of the surface charge are qualitatively consistent with the literature-provided dependence of the piezoelectric coefficient of a single-layer ferroelectret on the polarization voltage.

3

Piezoelectric bending of GPL-reinforced annular and circular sandwich nanoplates with FG porous core integrated with sensor and actuator using DQM

Sobhy Mohammed

Archives of Civil and Mechanical Engineering

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2021

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Vol. 21, no. 2

621--638

EN

Axisymmetric bending analysis of graphene platelet (GPL) sandwich annular and circular nanoplates with FG porous core and integrated with sensor and actuator resting on an elastic substrate under various boundary conditions is presented in this article. The present nanocomposite model is subjected to mechanical load and an external voltage. The upper and lower sandwich layers are made of aluminum matrix with GPL reinforcement. The effective material properties of the sandwich face layers are estimated in the framework of Halpin–Tsai scheme. In accordance with a refined four-variable theory considering the transverse shear and normal strains, the motion equations are obtained from principle of the virtual work. The size effects are considered by employing the nonlocal strain gradient theory. The differential quadrature method is utilized here to solve the governing equations. First, the obtained results are validated by implementing some comparisons with previous work. Then a comprehensive illustration is executed to show the impacts of boundary conditions, GPLs weight fraction, geometrical dimensions, elastic foundation parameters and applied voltage on the bending of the sandwich nanoplates with FG-porous core and piezoelectric layers.

4

Piezoelektryczne kompozyty polietylenu modyfikowane metodą wyładowań koronowych

Królikowski Bogusław, Klimiec Ewa, Kaczmarek Halina, Chylińska Marta, Frąszczak Zbigniew

Przemysł Chemiczny

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2020

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T. 99, nr 3

430--433

PL

Przedstawiono wyniki badań piezoelektrycznych i mechanicznych właściwości kompozytów polietylenu z czterema napełniaczami glinokrzemianowymi. Kompozyty otrzymano metodą wytłaczania dwuetapowego. W celu wyznaczenia właściwości piezoelektrycznych poddano je orientowaniu oraz modyfikacji za pomocą wyładowań koronowych. Stwierdzono, że pod wpływem tej modyfikacji w badanych układach powstawał ładunek piezoelektryczny stabilny przez 200 dni, lecz wartości współczynnika piezoelektrycznego d₃₃ były mniejsze niż w przypadku polaryzacji w polu elektrycznym.

EN

Eight polyethylene-matrix composites with 4 mineral fillers were 2-stage extruded to 1.5 mm thick films oriented then by tension 10–120 kPa. The films were corona dischargetreated and studied for piezoelec. properties. The piezoelec. charge was stable for 200 days but the piezoelec. coeff. was smaller than in the case of polarization in the elec. field.

5

Temperature variation effect on the active vibration control of smart composite beam

Salah Mostefa, Boukhoulda Farouk B., Nouari Mohamed, Bendine Kouider

Acta Mechanica et Automatica

|

2020

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Vol. 14, no. 3

166--174

EN

Due to their impressive capacity of sensing and actuating, piezoelectric materials have been widely merged in different industrial fields, especially aeronautic and aerospace area. However, in the aeronautic industry, the structures are operating under critical environ-mental loads such as high and very low temperature, which made the investigation of the effect of thermal forces on the piezoelectric struc-tures indispensable to reach the high functionality and performance. The present paper focuses on the effect of thermal loads on the active vibration control (AVC) of structures like beams. For this purpose, a finite element model of composite beam with fully covered piezoelec-tric sensor and actuator based on the well-known high order shear deformation theory is proposed by taking into account the electrical po-tential field and a linear temperature field. Hamilton’s principle is used to formulate the electro-thermo-mechanical governing equations. The negative velocity feedback controller is implemented to provide the necessary gain for the actuator. Different analyses are effectuated to present the effect of the temperature ranging from -70°C to 70°C on the active vibration control of the composite beam.

6

A Comprehensive Study and Analysis of Kinetic Energy Floor

Kashem Saad bin Abul, Majid Molla E., Tabassum Mujahid, Iqbal Atif, Pandav Kiran, Abdellah Kouzou

Acta Energetica

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2020

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nr 2

6--13

EN

This research studies the concept of piezoelectricity, in which the energy can be captured with a small compression. Kinetic energy floor by piezoelectric is able to generate electricity under compression of human weight. A survey has been conducted to estimate the energy that can be harness from human walk. At Swinburne University of Technology Sarawak Campus, the pathway between A/B block and G block has been chosen to do the survey which has the highest population in walking. An experimental model has been designed and evaluated; results obtained after continuous experiments and troubleshooting are tabulated. Comparison between the theoretical and experimental result are made for better understanding on the functionality and credibility of the device. In this paper, recommendations are also included for future implementation.

PL

Praca ta bada zjawisko piezoelektryczności, które umożliwia pozyskiwanie energii przy niewielkich naciskach. Kinetyczna podłoga energetyczna z piezoelektryku może generować energię elektryczną pod wpływem nacisku masy człowieka. Przeprowadzono badanie w celu oszacowania energii, jaką można pozyskać i wykorzystać podczas chodzenia. W kampusie Sarawak Uniwersytetu Technicznego Swinburne do badań wybrano najbardziej uczęszczaną ścieżkę między blokiem A/B a blokiem G. Zaprojektowano i oceniono model eksperymentalny; wyniki uzyskane po ciągłych eksperymentach i rozwiązywaniu problemów zestawiono w tabeli. Aby lepiej poznać funkcjonalność i przydatność tego urządzenia, porównano wyniki teoretyczne i eksperymentalne. W artykule zawarto także zalecenia co do przyszłych wdrożeń.

7

Design and fabrication of a new fiber-cement-piezoelectric composite sensor for measurement of inner stress in concrete structures

Lezgy-Nazargah M., Saeidi-Aminabadi S., Yousefzadeh M. A.

Archives of Civil and Mechanical Engineering

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2019

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Vol. 19, no. 2

405--416

EN

Rare suitable sensors are reported till now for the accurate measurement of inner forces at the concrete structures. In this study, a novel sensor is designed and fabricated for the evaluation of inner stress in the concrete structures under dynamical loads. By embedding this sensor in the critical points of the modern concrete structures (e.g. high-rise buildings, large-span bridges, dams, etc.), the heath monitoring of such structures may be easily done. The proposed sensor is a 5 cm × 5 cm × 5 cm cube made of a novel cement-resin-fiber composite matrix. A number of circular piezoelectric sheets with the same polarization alignment are embedded at the center of the cube with the certain distance from each other. The composite material used in the construction of the proposed sensor is in fact a new matrix composed of Portland cement, resin, water, fine silica and polymeric fibers which guarantees the strength, safety and sensitivity of the sensor at high level of stresses. The performance and reliability of the presented sensor has been proved through experimental tests. By considering different range of input force frequency (ω), it was found that the simple exponential law ΔV = 0.8 exp(−0.037ω)ΔF exists between the amplitude of output sensor (ΔV) and amplitude of input force (ΔF). Compared to optical sensors and other available types of sensors which usually require special fabrication technology, the proposed sensor is low-price and easy to build and install. High sensitivity and precision in the range of 0.5–50 Hz, good compatibility with concrete, high durability, and the generating of strong output signals are other advantages of the proposed sensor.

8

Investigation of Electrical Properties for Cantilever-Based Piezoelectric Energy Harvester

Ali Ahsan, Pasha Riffat Asim, Sheeraz Muhammad Abdullah, Butt Zubair, Elahi Hassan, Khan Afzaal Ahmed

Advances in Science and Technology. Research Journal

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2019

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Vol. 13, no 3

76--85

EN

In the present era, the renewable sources of energy, e.g., piezoelectric materials are in great demand. They play a vital role in the field of micro-electromechanical systems, e.g., sensors and actuators. The cantilever-based piezoelectric energy harvesters are very popular because of their high performance and utilization. In this research-work, an energy harvester model based on a cantilever beam with bimorph PZT-5A, having a substrate layer of structural steel, was presented. The proposed energy scavenging system, designed in COMSOL Multiphysics, was applied to analyze the electrical output as a function of excitation frequencies, load resistances and accelerations. Analytical modeling was employed to measure the output voltage and power under pre-defined conditions of acceleration and load resistance. Experimentation was also performed to determine the relationship between independent and output parameters. Energy harvester is capable of producing the maximum power of 1.16 mW at a resonant frequency of 71 Hz under 1g acceleration, having load resistance of 12 kΩ. It was observed that acceleration and output power are directly proportional to each other. Moreover, the investigation conveys that the experimental results are in good agreement with the numerical results. The maximum error obtained between the experimental and numerical investigation was found to equal 4.3%.

9

Effect of the thickness of the piezoelectric patches on the active control of a thin plate

Latrache M., Amrane M. N.

Mechanics and Mechanical Engineering

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2018

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Vol. 22, nr 4

1345--1354

EN

This paper presents a numerical study pertaining to on the active vibration control (AVC) of the 3-D rectangle simply supported plate bonded of the piezoelectric sensor/actuator pairs. A LQR controller is designed based on the independent mode space control techniques to stifle the vibration of the system. The change in the thickness of the patches was a clear impact on the control results, and also in the values of the voltage in actuator. The results were established by simulating in ANSYS and MATLAB.

10

An analytical investigation of a 2D-PPMs hollow infinite cylinder under thermo-electro-mechanical (TEM) loadings

Meshkini M., Firoozbakhsh K., Jabbari M., SelkGhafari A.

Journal of Theoretical and Applied Mechanics

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2018

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Vol. 56 nr 1

107--122

EN

The analytical solution of steady-state asymmetric thermo-electro-mechanical loads of a hollow thick infinite cylinder made of porous piezoelectric materials (2D-PPMs) based on two-dimensional equations of thermoelasticity is considered. The general form of thermal and mechanical boundary conditions is considered on the inside and outside surfaces. A direct method is used to solve the heat conduction equation and the non-homogenous system of partial differential Navier equations using the complex Fourier series and the powerexponential law functions method. The material properties are assumed to depend on the radial and circumferential variable and are expressed as power-exponential law functions along the radial and circumferential direction.

11

Detection of faults in the asynchronous machine by the use of smartmaterials

Regaz A., Zegnini B., Mahi D., Boukezzi L.

Diagnostyka

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2018

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Vol. 19, No. 3

43--54

EN

This paper aimed with diagnosis of defects in asynchronous machine. The used method is based on the exploitation of the behavioural laws of magnetostrictive and piezoelectric materials, under harmonic regime, used in the construction of the asynchronous machine. Piezoelectric sensors are used both in the stator and in the rotor. The used one in the stator serves to detect the rupture at the stator windings and the one used in the rotor helps us to detect the rupture of the rotor bars. The produced electric potential in the terminals of piezoelectric sensor is due to the deformation generated by magnetic induction under the effect of magnetostriction. A finite element method (FEM) is selected to be the resolution numerical method. This method is used for modelling the asynchronous machine under anomaly conditions and non-load.

12

New technologies using renewable energy in road construction

Sumorek A., Buczaj M.

ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes

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2017

|

Vol. 6, No 4

83--91

EN

Energy harvesting consists in the processing and storage of energy which is normally dissipated to the ambient environment. This study presents two solutions using two methods of energy generation: conversion of solar energy into electricity on the road surface and energy recovery from road surface vibrations and displacements. The description of configuration of testing stand dedicated for road surface vibrations energy harvesting has been also included. Described testing stand will make it possible to verify the possibility of application of piezoelectric transducers in road pavement in terms of occurrence of damages and the value of generated energy.

13

Electronic structure, first and second order physical properties of MPS4: a theoretical study

Dahame T., Bentria B., Faraoun H., Benghia A., Reshak A. H.

Materials Science Poland

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2016

|

Vol. 34, No. 2

275--285

EN

We have calculated the electronic structure and physical properties of metal thiophosphate compounds InPS4 and AlPS 4by means of pseudopotential density functional theory (DFT) coupled with the modern theory of polarization. The targeted physical properties are ﬁrst and second order optical properties as well as elastic, piezoelectric and electro-optic coefﬁcients. Furthermore, population analysis is presented in order to evaluate the covalent-ionic character of the constituent bonds. The calculated elastic constants, refractive indices and second order optical coefﬁcients of InPS4 are in good agreement with experimental values. With the absence of any theoretical or experimental physical properties of AlPS4, we predict that this compound has high piezoelectric coefﬁcients with d14 = − 73.82 pm/V, d25 = − 10.96 pm/V and d36 = 28.19 pm/V.

14

Implementation of an Electronic Circuit for SSSA Control Approach of a Plate Type Element and Experimental Match with a Feed-Forward Approach

Viscardi M., Leo R. di

Archive of Mechanical Engineering

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2016

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Vol. LXIII, nr 4

665--677

EN

Successful implementation of an active vibration control system is strictly correlated to the exact knowledge of the dynamic behavior of the system, of the excitation level and spectra and of the sensor and actuator’s specification. Only the correct management of these aspects may guarantee the correct choice of the control strategy and the relative performance. Within this paper, some preliminary activities aimed at the creation of a structurally simple, cheap and easily replaceable active control systems for metal panels are discussed. The final future aim is to control and to reduce noise, produced by vibrations of metal panels of the body of a car. The paper is focused on two points. The first one is the realization of an electronic circuit for Synchronized Shunted Switch Architecture (SSSA) with the right dimensioning of the components to control the proposed test article, represented by a rectangular aluminum plate. The second one is a preliminary experimental study on the test article, in controlled laboratory conditions, to compare performances of two possible control approach: SSSA and a feed-forward control approach. This comparison would contribute to the future choice of the most suitable control architecture for the specific attenuation of structure-born noise related to an automotive floor structure under deterministic (engine and road-tyre interaction) and stochastic (road-tyre interaction and aerodynamic) forcing actions.

PL

Udana implementacja układu aktywnej kontroli drgań jest ścisle uwarunkowana dokładną znajomością dynamicznych właściwości obiektu, poziomu i zawartości widmowej wymuszeń, a także parametrów czujników i elementów wykonawczych. Jedynie właściwe uwzględnienie wszystkich tych aspektów może zagwarantować poprawny wybór strategii sterowania i wynikające z niej działanie systemu. W pracy przedstawiono i przedyskutowano wyniki badań wstępnych ukierunkowanych na stworzenie prostego strukturalnie, taniego i łatwo wymienialnego aktywnego systemu sterowania, przeznaczonego dla paneli metalowych. Ostatecznym celem ma być kontrola i ograniczenie hałasu wytwarzanego przez drgające płyty metalowe w nadwoziu samochodu. Artykuł koncentruje się na dwu zagadnieniach. Pierwszym z nich jest realizacja układu elektronicznego działającego w architekturze synchronicznie kluczowanego bocznika (SSSA), z elementami dobranymi odpowiednio do sterowania testowanym obiektem, którym jest prostokątna płyta aluminiowa. Drugim celem jest wstępne studium doświadczalne nad zachowaniem się obiektu badanego, w kontrolowanych warunkach laboratoryjnych, służące porównaniu dwu możliwych koncepcji sterowania: z wykorzystaniem architektury synchronicznie kluczowanego bocznika (SSSA) oraz sterowania ze sprzężeniem wyprzedzającym. W przyszłości wyniki porównania ułatwią dokonanie wyboru architektury sterowania najwłaściwszej dla tłumienia hałasu strukturalnego wytwarzanego przez podłogę nadwozia samochodu pod wpływem wymuszeń deterministycznych (pochodzących od silnika i interakcji między oponami i nawierzchnią) oraz stochastycznych (aerodynamicznych i interakcji opona-nawierzchnia).

15

Construction Of A Piezoelectric-Based Resonance Ceramic Pressure Sensor Designed For High-Temperature Applications

Belavič D., Bradeško A., Santo Zarnik M., Rojac T.

Metrology and Measurement Systems

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2015

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Vol. 22, nr 3

331--340

EN

In this work the design aspects of a piezoelectric-based resonance ceramic pressure sensor made using low-temperature co-fired ceramic (LTCC) technology and designed for high-temperature applications is presented. The basic pressure-sensor structure consists of a circular, edge-clamped, deformable diaphragm that is bonded to a ring, which is part of the rigid ceramic structure. The resonance pressure sensor has an additional element – a piezoelectric actuator – for stimulating oscillation of the diaphragm in the resonance-frequency mode. The natural resonance frequency is dependent on the diaphragm construction (i.e., its materials and geometry) and on the actuator. This resonance frequency then changes due to the static deflection of the diaphragm caused by the applied pressure. The frequency shift is used as the output signal of the piezoelectric resonance pressure sensor and makes it possible to measure the static pressure. The characteristics of the pressure sensor also depend on the temperature, i.e., the temperature affects both the ceramic structure (its material and geometry) and the properties of the actuator. This work is focused on the ceramic structure, while the actuator will be investigated later.

16

An Approach to Design Broadband Air Backed Piezoelectric Sensor

Ali M. G. S., Elsayed N. Z., Eid E. A.

Archives of Acoustics

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2015

|

Vol. 40, No. 1

3--10

EN

In this work, an approach to the design of broadband thickness-mode piezoelectric transducer is presented. In this approach, simulation of discrete time model of the impulse response of matched and backed piezoelectric transducer is used to design high sensitivity, broad bandwidth, and short-duration impulse response transducers. The effect of matching the performance of transmitting and receiving air backed PZT-5A transducer working into water load is studied. The optimum acoustical characteristics of the quarter wavelength matching layers are determined by a compromise between sensitivity and pulse duration. The thickness of bonding layers is smaller than that of the quarter wavelength matching layers so that they do not change the resonance peak significantly. Our calculations show that the −3 dB air backed transducer bandwidth can be improved considerably by using quarter wavelength matching layers. The computer model developed in this work to predict the behavior of multilayer structures driven by a transient waveform agrees well with measured results. Furthermore, the advantage of this this model over other approaches is that the time signal for optimum set of matching layers can be predicted rapidly.

17

Amplified Piezo Actuator APA® with viscoelastic material for machine tool semi-active damping system

Kras A., Bourgain F., Claeyssen F.

Journal of Machine Engineering

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2014

|

Vol. 14, No. 3

83--96

EN

Modern machine tools must achieve a high precision for a better surface texture and higher flexibility for wide range of machining requirements. To fulfill these requirements, a semi-active damping system for a new generation of machine tools is proposed. The new concept is partially based on the Amplified Piezo Actuators APA® from CEDRAT Technologies. With these actuators, the dynamic behavior (stiffness and damping) of structural body components of machine tools can be controlled and adjusted to the optimum parameters. To reduce the transfer of vibrations through the active elements, a viscoelastic material was used. This article presents test results performed on the APA® with viscoelastic material. A significant reduction of the vibrational amplitude at resonance frequency was observed with additional material. The optimized quantity of viscoelastic material reduces the full stroke of the actuator only by 10 percent. At the same time, the viscoelastic material has red the tests performed on the machine tool showed significant surface texture improvement with use of the amplified piezoelectric actuator.

18

An influence of the d311 effect on the behavior of the cantilever beam-shaped piezoelectric activator made of two layers of pvdf with inverse polarity

Teter A., Gawryluk J., Warmiński J.

Applied Computer Science

|

2014

|

Vol. 10, no 3

23--33

EN

In the present work an example of the numerical modeling of electro-mechanical coupling of the activator in the form of cantilever beam made of two layers PVDF subjected to an inverse polarity is described. Calculations were done for static deflections at the selected voltage levels and for modal analysis with an included and excluded piezoelectric effect. The effect of active material on the behavior of the beam was examined. In order to validate the model, results of the static calculation were compared with the strict analytical solution and the results presented by other authors.

19

Wykorzystanie układu LTC3588-1 jako źródła pozyskiwania energii resztkowej

Tyborczyk S., Galla S.

Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej

|

2013

|

Nr 36

171--174

PL

Przedmiotem niniejszej pracy są zagadnienia odzyskiwania energii resztkowej generowanej wskutek mechanicznego odkształcania kryształu piezoelektrycznego oraz za pomocą ogniwa fotowoltaicznego przy zastosowaniu przetwornicy napięcia typu LTC3588-1. Zastosowana przetwornica umożliwia pozyskiwanie energii z różnych źródeł. W ramach referatu przedstawiono wyniki pracy nad mikrozasilaczem, który umożliwiał zarówno współpracę z piezoelektrykami jak i ogniwami fotowoltaicznymi

EN

The object of this paper are issues related to the recovery of the residual energy generated by the mechanical deformation of the piezoelectric crystal or by the use of a photovoltaic cell using a specialized LTC3588-1 voltage converter. The applied converter allows to use various energy source.

20

Wpływ degradacji połączenia generatora piezoelektrycznego z belką na pozyskiwaną energię elektryczną

Nowak R., Pietrzakowski M.

Symulacja w Badaniach i Rozwoju

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2013

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Vol. 4, nr 4

185--192

PL

Efektywność odzysku energii elektrycznej z energii drgań mechanicznych zależy między innymi od jakości połączenia pomiędzy generatorem piezoelektrycznym a belką. W niniejszym artykule przeprowadzono obliczenia belki wysięgnikowej wymuszonej ruchem harmonicznym podpory. Porównano wyniki otrzymane metodą analityczną i metodą elementów skończonych. Skupiono się na wpływie degradacji połączenia na charakterystyki dynamiczne układu i odzyskiwane napięcie. Porównano charakterystyki amplitudowo-częstotliwościowe w przypadku uszkodzonej i nieuszkodzonej warstwy kleju. Przeprowadzono badania w zależności od położenia obszaru degradacji i stopnia zniszczenia warstwy kleju.

EN

Efficiency of energy harvesting depends on the coupling of the piezoelectric generator and the beam. Calculations of the cantilever beam excited by harmonic movement of the support has been executed in this article. Comparison of the results performed by analytical method and finite element method has been done. Influence on dynamic behavior of the system and generated voltage caused by glue layer degradation was made. Amplitude-frequency characteristics has been compared for damaged and undamaged glue layer. Placement and degree of damage of the glue layer was researched in case of effect onto generated voltage.