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Tytuł:
Investigation of Electrical Properties for Cantilever-Based Piezoelectric Energy Harvester
Autorzy:
Ali, Ahsan
Pasha, Riffat Asim
Sheeraz, Muhammad Abdullah
Butt, Zubair
Elahi, Hassan
Khan, Afzaal Ahmed
Powiązania:
https://bibliotekanauki.pl/articles/102729.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
piezoelectric
micro-electromechanical systems
energy harvesting
microsystems
bimorph
systemy mikroelektromechaniczne
zbieranie energii
mikrosystemy
bimorf
Opis:
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%.
Źródło:
Advances in Science and Technology. Research Journal; 2019, 13, 3; 76-85
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Approach to Design Broadband Air Backed Piezoelectric Sensor
Autorzy:
Ali, M. G. S.
Elsayed, N. Z.
Eid, E. A.
Powiązania:
https://bibliotekanauki.pl/articles/176360.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
piezoelectric
equivalent circuits
impulse response
frequency response
matching layers
z-transform
Opis:
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.
Źródło:
Archives of Acoustics; 2015, 40, 1; 3-10
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fourier expansion solution for a switched shunt control applied to a duct
Rozwiązanie Fouriera dla przewodu akustycznego z bocznikującym układem sterowania
Autorzy:
Ameduri, S.
Ciminello, M.
Powiązania:
https://bibliotekanauki.pl/articles/280041.pdf
Data publikacji:
2010
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
synchronised switched shunt control
piezoelectric
pressure sound level
Opis:
In the present work, a semi analytic approach aimed at estimating the effects on reduction of the pressure sound level by synchronised switched shunt logic is described. The displacement field within a 1D longitudinal air column through a Fourier series expansion has been formalised by assigning a sinusoidal perturbation and fluid-structure interface condition on the left and right boundaries, respectively. To simulate the no control operative condition, the solution has been computed for the entire time domain, keeping invariant all circuitry properties; then for the switch working modality, the solution has been computed by splitting the entire time domain into partitions; for any partition, specific circuitry properties (e.g. piezo voltage, electrical field...) have been selected. Based on the displacement information, the related sound pressure level has been compared for no controlled and controlled operative conditions, with and without signal amplification.
W pracy zaprezentowano pół-analityczne rozwiązanie zagadnienia redukcji poziomu ciśnienia akustycznego w przewodzie za pomocą zsynchronizowanej metody bocznikowania. Opis pola przemieszczeń wewnątrz jednowymiarowej kolumny powietrza sformalizowano rozwinięciem w szereg Fouriera przy uwzględnieniu sinusoidalnie zmiennych zaburzeń na prawym i lewym brzegu przewodu. Dla przypadku z wyłączonym układem sterowania rozwiązanie obliczono w całej dziedzinie czasu przy utrzymaniu stałych parametrów obwodu elektrycznego, natomiast dla trybu sterowanego dokonano analizy, dzieląc przedział czasu na fragmenty. W każdym z nich charakterystyczne cechy układu sterowania (np. napięcie przykładane do piezoelektryków, natężenie pola elektrycznego...) dobrano w odpowiedni sposób. Na podstawie obserwacji przemieszczeń porównano poziom ciśnienia akustycznego dla warunków z wyłączonym i włączonym sterowaniem oraz z i bez wzmocnienia sygnału.
Źródło:
Journal of Theoretical and Applied Mechanics; 2010, 48, 2; 479-504
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bandwidth and power enhancement in the MEMS-based piezoelectric energy harvester using magnetic tip mass
Autorzy:
Anand, Ashutosh
Pal, Srikanta
Kundu, Sudip
Powiązania:
https://bibliotekanauki.pl/articles/2173519.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
vibration
piezoelectric energy harvester
magnetic tip mass
bandwidth
stress
wibracja
zbieracz energii piezoelektryczny
magnetyczna masa końcówki
przepustowość łącza
stres
Opis:
In this paper, the performance and frequency bandwidth of the piezoelectric energy harvester (PZEH) is improved by introducing two permanent magnets attached to the proof mass of a dual beam structure. Both magnets are in the vicinity of each other and attached in such a way to proof mass of a dual beam so that they create a magnetic field around each other. The generated magnetic field develops a repulsive force between the magnets, which improves electrical output and enhances the bandwidth of the harvester. The simple rectangular cantilever structure with and without magnetic tip mass has a frequency bandwidth of 4 Hz and 4.5 Hz, respectively. The proposed structure generates a peak voltage of 20 V at a frequency of 114.51 Hz at an excitation acceleration of 1 g (g= 9.8 m/s2 ). The peak output power of a proposed structure is 25.5 µW. The operational frequency range of a proposed dual beam cantilever with a magnetic tip mass of 30 mT is from 102.51 Hz to 120.51 Hz, i.e., 18 Hz. The operational frequency range of a dual beam cantilever without magnetic tip mass is from 104.18 Hz to 118.18 Hz, i.e., 14 Hz. There is an improvement of 22.22% in the frequency bandwidth of the proposed dual beam cantilever with a magnetic tip mass of 30 mT than the dual beam without magnetic tip mass.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2022, 70, 1; e137509, 1--10
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Forced nonlinear vibrations in a smart magneto-viscoelastic multiscale composite nanobeam in a humid thermal environment
Autorzy:
Anitha, Lakshmanan
Rajalakshmi, Loganathan
Selvamani, Rajendran
Ebrahimi, Farzad
Powiązania:
https://bibliotekanauki.pl/articles/38911353.pdf
Data publikacji:
2023
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
piezoelectric nanobeam
vibration analysis
viscoelastic damping
nonlocal strain gradient
magneto-electro-viscoelastic
Opis:
In this paper, we study forced harmonic waves in a magneto-electro-viscoelastic (MEV) nanobeam embedded in a viscoelastic foundation using nonlocal strain gradient elasticity theory. The viscoelastic foundation is modeled as a Winkler-Pasternak layer. The governing equations of the nonlocal strain gradient viscoelastic nanobeam are derived using Hamilton’s principle and solved analytically. A parametric study is presented to examine the effects of physical variables on the field. It is found that the effect of strain gradient and nonlocal parameter on dimensionless amplitude and phase angle is quite important. The findings from this study highlight the significance of identifying magneto-piezoelectricity in predicting the vibration characteristics of intelligent nanostructures and elucidating the impact of humid thermal effects on nanomaterials.
Źródło:
Engineering Transactions; 2023, 71, 4; 617-644
0867-888X
Pojawia się w:
Engineering Transactions
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison between HPM and finite Fourier solution in static analysis of FGPM beam under thermal load
Porównanie rezultatów analizy statycznej belki FGPM otrzymanych metodą HPM i za pomocą skończonej transformacji Fouriera
Autorzy:
Armin, A.
Shafieenejad, I.
Moallemi, N.
Novinzadeh, A. B.
Powiązania:
https://bibliotekanauki.pl/articles/280108.pdf
Data publikacji:
2010
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
functionally graded piezoelectric material
thermal load
first order shear deformation theory
homotopy perturbation method
Opis:
Linear and nonlinear phenomena play important role in applied mathematics, physics and also in engineering problems in which any parameter may vary depending on different factors. In recent years, the homotopy perturbation method (HPM) is constantly being developed and applied to solve various linear and nonlinear problems. In this paper, static analysis of functionally graded piezoelectric beams based on the first-order shear deformation theory under thermal loads has been investigated. The beam with a functionally graded piezoelectric material (FGPM) is graded in the thickness direction and a simple power law index governs the piezoelectric material properties. The electric potential is assumed linear across the beam thickness. The governing equations are obtained using potential energy and Hamilton's principle and may lead to a system of differential equations. We suggest two methods to solve this problem, the homotopy perturbation and analytical solution obtained by the finite Fourier transformation. The homotopy perturbation method and a proper algorithm are suggested to solve simultaneous differential equations. The results are presented for different power law indexes under uniform thermal gradient. The results are compared with the analytical solution obtained by the finite Fourier transformation for simply supported boundary conditions.
Zjawiska liniowe i nieliniowe odgrywają ważna rolę w dziedzinie matematyki stosowanej, fizyki, a tak ze zagadnieniach inżynierskich, w których dowolny parametr może ulegać zmianie pod wpływem różnych czynników. W ostatnich latach perturbacyjna metoda homotopii (HPM) ulegała ciągłemu rozwojowi i znalazła zastosowanie w rozwiązywaniu różnorodnych liniowych i nieliniowych zadań. W tej pracy zaprezentowano wyniki analizy statycznej belki wykonanej z gradientowego materiału zawierającego frakcję piezoelektryczną i obciążonej termicznie otrzymanych przy pomocy teorii odkształceń postaciowych pierwszego rzędu. Belka z materiału funkcjonalnego (FGPM) ma strukturę gradientową, tj. posiada właściwości materiałowe zmienne w sposób ciągły wzdłuż grubości tej belki, zgodnie z założonym rozkładem wykładniczym zawartości aktywnej frakcji piezoelektryka w całym materiale. Założono, że potencjał elektryczny ma rozkład liniowy wzdłuż grubości belki. Różniczkowe równania ruchu układu otrzymano, używając wyrażenia na energię potencjalną i stosując zasadę Hamiltona. Do ich rozwiązania zaproponowano dwie metody: perturbacyjną homotopii i analityczną w drodze skończonej transformacji Fouriera. W metodzie homotopii zasugerowano odpowiedni algorytm rozwiązywania układu równań różniczkowych. Wyniki przedstawiono dla różnych rozkładów aktywnej frakcji piezoelektrycznej przy utrzymaniu jednorodnego gradientu temperatury. Wyniki porównano z rozwiązaniem analitycznym otrzymanym za pomocą skończonej transformacji Fouriera dla warunków brzegowych belki odpowiadających swobodnemu podparciu.
Źródło:
Journal of Theoretical and Applied Mechanics; 2010, 48, 1; 173-189
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
FEM Analysis of Active Reduction of Torsional Vibrations of Clamped-Free Beam by Piezoelectric Elements for Separated Modes
Autorzy:
Augustyn, E.
Kozień, M. S.
Prącik, M.
Powiązania:
https://bibliotekanauki.pl/articles/176836.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
piezoelectric elements
torsional vibrations
Opis:
Beams with rectangular cross-section, with large length-to-width ratio, can be excited to torsional vibrations. If the piezoelectric elements are mounted to the beam in pairs at the same cross-section with two separated elements positioned on the same side of the beam, and the voltages applied to them are in the opposite phase, they produce twisting moments which can be applied to reduce the torsional vibrations. Results of FEM simulations are presented and analysed in the paper. All analyses are performed for a steel free-clamped beam. The piezoelectric elements made of PZT material are mounted in pairs on one side of the beam. The analyses are done for separated natural modes.
Źródło:
Archives of Acoustics; 2014, 39, 4; 639-644
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Control of a workpiece holder with piezo-electric-mechanical actuation
Autorzy:
Bakker, O. J.
Popov, A.
Ratchev, S.
Powiązania:
https://bibliotekanauki.pl/articles/1429345.pdf
Data publikacji:
2008
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
fixturing technology
active fixture
fixture control
dynamics modelling
piezoelectric actuation
Opis:
The main focus of research in part-fixture mechanics has been in the static deformation and part constraints. Little attention has been paid to the dynamic behaviour of these systems. However, the dynamics of the system largely determines the obtained precision during the machining process. The part is modelled as a lumped mass-spring model and the clampers and locators of the fixture are modelled as spring-dampers. The fixture frame is considered to be much stiffer than the locators, such that it provides zero displacement boundary conditions to the locators. In this study a piezoelectric actuator is utilized to provide adaptive clamping forces. The analysis has shown that position feedback can be used to minimize unnecessary displacement of the workpiece. Additionally, a lag filter can improve the steady state response.
Źródło:
Journal of Machine Engineering; 2008, 8, 3; 17-28
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Detection of damages in hybrid composite plates with the use of elastic waves generated by PZT active sensors
Autorzy:
Barski, M.
Pająk, P.
Powiązania:
https://bibliotekanauki.pl/articles/246873.pdf
Data publikacji:
2017
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
elastic waves
hybrid composite plates
piezoelectric active sensors
low velocity impact
damages
FEM
Opis:
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.
Źródło:
Journal of KONES; 2017, 24, 2; 17-24
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental and numerical analysis of guided waves propagation in narrow isotropic plate with notch
Autorzy:
Barski, M.
Pająk, P.
Powiązania:
https://bibliotekanauki.pl/articles/241897.pdf
Data publikacji:
2014
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
narrow plate
aluminium alloy
notch
guided waves
piezoelectric transducers
finite element method
Opis:
The phenomenon of the guided waves propagation can be applied in order to detect different types of damages in real structures. The existence of flaws, like cracks, notches, or holes, causes the change of the wave propagation in the analysed structure in comparison with the intact one. However, in the vicinity of the free edges the dynamic response is very complicated due to the reflections and interference of the incident waves. Thus, the process of the damage detection and localization can be very difficult. Therefore, the current work is devoted to the experimental and numerical analysis of the guided waves propagation in the narrow, thin plates (beams). The investigated structure is made of aluminum alloy. Mainly, the influence of the notch on the waves’ propagation is studied. The waves are generated and picked up by the piezoelectric transducers. In order to carry out the numerical simulations the finite element method is applied. Moreover, the piezoelectric activators and sensors are modelled with the use of the coupled field finite solid elements and the plate with the use of the structural solid elements. Generally, three types of the waves are observed, namely the horizontal and shear wave, which move along the symmetry axis of the plate and the horizontal wave, which propagates in the perpendicular direction. The existence of the notch generally causes that the voltage amplitude of the received signal is reduced in comparison with the results obtained for the intact structure. Qualitatively, the similar effect is observed in the case of the experimental findings.
Źródło:
Journal of KONES; 2014, 21, 1; 23-30
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Construction Of A Piezoelectric-Based Resonance Ceramic Pressure Sensor Designed For High-Temperature Applications
Autorzy:
Belavič, D.
Bradeško, A.
Santo Zarnik, M.
Rojac, T.
Powiązania:
https://bibliotekanauki.pl/articles/221229.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
LTCC
piezoelectric
pressure sensor
Opis:
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.
Źródło:
Metrology and Measurement Systems; 2015, 22, 3; 331-340
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis of barium titanate piezoelectric ceramics for multilayer actuators (MLAs)
Autorzy:
Biglar, M.
Stachowicz, F.
Trzepieciński, T.
Gromada, M.
Powiązania:
https://bibliotekanauki.pl/articles/387500.pdf
Data publikacji:
2017
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
barium titanate
MLAs
multilayer actuator
solid state
piezoelectric ceramics
Opis:
In this paper the characteristics of BaTiO3 ceramics synthesized by solid state method is presented. In order to receive the monophase ceramics the double activation and calcination were applied. A spray drier was used to granulate the powder of BaTiO3. Isostatic and uniaxial pressing were applied to manufacture the barium titanate pellets. The properties of fabricated BaTiO3 ceramics were determined at different stages of production. After the sintering phase, the hardness, the bending strength, the fracture toughness, and the coefficient of thermal expansion of barium titanate sinter were estimated. The BaTiO3 powder is characterized by spherical grains and the average size of 0.5 μm. The small value of the specific surface area of granulate ensured good properties of material mouldability and finally allowed to receive sinters of high density
Źródło:
Acta Mechanica et Automatica; 2017, 11, 4; 275-279
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multicomponent ceramic materials on the basis of PZT for the production of piezoelectric resonators
Autorzy:
Bochenek, D.
Surowiak, Z.
Gavrilyachenko, S. V.
Kupriyanov, M. F.
Powiązania:
https://bibliotekanauki.pl/articles/176898.pdf
Data publikacji:
2005
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
PZT
piezoelectric transducers
resonance frequency
thermal stability
Opis:
Investigations on the influence of the PbTiO3 content on the crystalline and domain structure of PZT-based four-component solid solutions have been performed. It has been shown that there is a close relation between the structure and temperature stability of the resonance frequency (fr) of the fabricated piezoceramic transducers. Better and more stable results have been obtained by doping and modifying the basic chemical composition obtaining Pb(Zr1-x Tix)O3. The compositions with minimal Δ fr / fr, within the temperature range T = 213–358 K (in relation to room temperature Tr = 293 K), exhibited (i) the smallest internal friction (Q-1m), (ii) the highest mechanical quality (Qm), (iii) high values of spontaneous deformation of the elementary cell (δT and δRe), (iv) the complex a-c-domain structure in the tetragonal phase (T) and the simple domain structure in the rhombohedral phase (Re). The practical result of the present work was the fabrication of piezoceramic electric band filters exhibiting Δ fr / fr < 0.2% and a high mechanical quality factor (Qm = 3225).
Źródło:
Archives of Acoustics; 2005, 30, 1; 87-107
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quasi-optimal PZT distribution in active vibration reduction of the triangular plate with P-F-F boundary conditions
Autorzy:
Brański, A.
Szela, S.
Powiązania:
https://bibliotekanauki.pl/articles/229810.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
triangular plate
PZT (piezoelectric zirconate titanate) actuator
P-F-F (partial-free-free) boundary condition
active vibration reduction
Opis:
An active reduction of transverse vibration of the triangular plate with P-F-F boundary conditions is considered. The cracked plate is idealized research model as partially clamped on one edge with varying clamped length. The active reduction is realised with PZTs. In the paper, assuming the detached base clamped length, the influence of PZTs distribution on the bending moment and the shearing force at the clamped edge is investigated. To realize the purpose two cases are considered. At the former the PZTs are attached at points in which the curvatures of the surface locally take their maximum (MC sub-areas or quasi-optimal ones). At the latter, the PZTs are somewhat shifted. The plate is excited with harmonic plane acoustic wave. The second mode is considered only. The active vibration reduction study with a finite element method (FEM) is carried out. The numerical calculations show that better results are obtained for MC distribution of the PZTs.
Źródło:
Archives of Control Sciences; 2010, 20, 2; 209-226
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A method for correction of elastic and piezoelectric constants of crystals using measured surface acoustic wave parameters
Metoda korekcji stałych elastycznych i piezoelektrycznych kryształów z wykorzystaniem zmierzonych parametrów akustycznych fal powierzchniowych
Autorzy:
Brzozowski, E.
Powiązania:
https://bibliotekanauki.pl/articles/192248.pdf
Data publikacji:
2011
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technologii Materiałów Elektronicznych
Tematy:
stałe elastyczne
stałe piezoelektryczne
stałe dielektryczne
akustyczna fala powierzchniowa
elastic constants
piezoelectric constants
dielectric constants
Opis:
Surface acoustic wave (SAW) properties of a crystal depend on the density, elastic, piezoelectric and dielectric constants.On the basis of literature data, calculations of SAW parameters in a neodymium calcium oxoborate [NdCa4O(BO3)3] crystal were carried out to evaluate orientations optimal for the correction of elastic and piezoelectric constants. SAW velocities and electromechanical coupling coefficients were measured using SAW delay lines deposited on differently oriented crystal substrates. Dielectric constants were determined from measured effective permittivities. Both a nonlinear least squares algorithm and a computer program for the correction of elastic and piezoelectric constants from measured SAW velocities and electromechanical coupling coefficients were developed. The correction of NdCa4O(BO3)3 elastic and piezoelectric constants was carried out. It was shown that for the corrected constants the differences between the measured and calculated SAW parameters are marginal.
Własności akustycznych fal powierzchniowych (AFP) w rysztale zależą od gęstości stałych elastycznych, piezoelektrycznych i dielektrycznych. Na podstawie danych z literatury obliczono parametry AFP w krysztale tlenoboranu neodymowo wapniowego [NdCa4O(BO3)3] w celu wyznaczenia orientacji optymalnych do korekcji stałych. Zmierzono prędkości i współczynniki sprzężenia elektromechanicznego AFP z wykorzystaniem linii opóźniających osadzonych na podłożach NdCa4O(BO3)3 o różnych orientacjach. Wyznaczono stałe dielektryczne z pomiaru przenikalności elektrycznych. Opracowano metodę korekcji stałych elastycznych i piezoelektrycznych wykorzystującą nieliniowy algorytm najmniejszych kwadratów i zmierzone parametry AFP. Przeprowadzono korekcję stałych elastycznych i piezoelektrycznych kryształu NdCa4O(BO3)3. Wykazano, że dla stałych skorygowanych różnice między zmierzonymi, a obliczonymi parametrami AFP są bardzo małe.
Źródło:
Materiały Elektroniczne; 2011, T. 39, nr 2, 2; 8-13
0209-0058
Pojawia się w:
Materiały Elektroniczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 171

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