PL
 |
EN
Preferencje help
Polish version English version Język
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 11

Liczba wyników na stronie
first rewind previous Strona / 1 next fast forward last
Wyniki wyszukiwania
Wyszukiwano:
w słowach kluczowych:  energy harvester
help Sortuj według:

help Ogranicz wyniki do:
first rewind previous Strona / 1 next fast forward last
1
Content available Experimental investigation of a uniaxial dielectric elastomer generator
Sikora Wojciech
Acta Mechanica et Automatica
|
2023
|
Vol. 17, no. 4
499--506
EN
The widespread use of battery-powered electronic devices creates the need to develop methods to extend their maximum operating time. This can be achieved by using ambient energy, which would otherwise be dissipated. The conversion of energy, usually mechanical energy, into electric energy takes place in energy harvesters. Energy harvester systems based on a dielectric elastomer (DE) are a relatively new field that is being constantly developed. Due to their features, dielectric elastomer generators (DEGs) may complement the currently dominant piezoelectric harvesters. The major feature of employing a hyperelastic material is that it allows relatively large displacements to be utilised for generating energy, which is impossible in the case of piezoceramics. This article presents a DEG designed to operate under uniaxial tensile loads and which has a multilayer structure, describes the general operating principles of a DEG, explains the construction and assembly process of the investigated design and shows the electric circuit necessary to properly direct current flow during the DEG operation. The experimental part consists of two series of tests based on a central composite design (CCD). The objective of the first part was to map a capacitance response surface of the DEG in the selected range of the cyclic mechanical load. The second part concerned the amount of generated energy for the specific load case as a function of operating voltages. The result of the work is the formulation of regression models that allow the characteristics of the presented DEG design to be identified.
2
Content available Ability of energy harvesting MR damper to act as a velocity sensor in vibration control systems
Rosół Maciej, Sapiński Bogdan
Acta Mechanica et Automatica
|
2019
|
Vol. 13, no. 2
135--145
EN
The study investigates the self-sensing ability in an energy harvesting magnetorheological damper (EHMRD). The device consists of a conventional linear MR damper and an electromagnetic harvester. The objective of the work is to demonstrate that the EHMRD with specific self-powered feature can also serve as a velocity sensor. Main components of the device and design structure are summarized and its operation principle is highlighted. The diagram of the experimental set-up incorporating the measurement and processing unit is provided, the experimental procedure is outlined and data processing is discussed. The self-sensing function is proposed whereby the relative velocity of the EHMRD can be reconstructed from the electromotive force (emf) induced in the harvester coil. To demonstrate the adequacy of the self-sensing action (i.e., the induced emf should agree well with the relative velocity), the proposed self-sensing function is implemented and tested in the embedded system that will be a target control platform. Finally, the test results of the system utilizing a switching control algorithm are provided to demonstrate the potentials of the EHMRD acting as a velocity sensor and to confirm its applicability in semi-active vibration control systems.
3
Content available remote Dynamics and energy harvesting control of an autoparametric pendulum-like system
Mitura A., Kecik K., Augustyniak M.
Przegląd Elektrotechniczny
|
2018
|
R. 94, nr 7
82--85
EN
This paper describes experimental rig used to research system with a pendulum. The pendulum has a double functions. Firstly, it is applied as a non-linear vibration absorber for a simple oscillator. Secondly, an additional magnets-coil subsystem mounted inside a pendulum structure gives possibility of energy recovery. Influence of an oscillator suspension damping and stiffness control on effectiveness of both effects are presented.
PL
Praca opisuje stanowisko eksperymentalne wykorzystywane do badań systemu z wahadłem. Wahadło ma podwójną funkcję. Po pierwsze, jest zastosowane jako nieliniowy eliminator drgań prostego oscylatora. Dodatkowy podukład magnesów i cewki zamontowany na wahadle umożliwia odzyskiwanie energii z jego ruchu. Przedstawiono wpływ sterowania tłumieniem lub sztywnością zawieszenia na skuteczność obu efektów.
4
Comparison between time- and frequency methods for determination of response characteristics of a nonlinear vibration energy harvester
Kulik M.
Zeszyty Naukowe. Elektryka / Politechnika Opolska
|
2017
|
z. 75
45--46
EN
The paper presents the frequency characteristics of a nonlinear vibration energy harvester determined via the time- and frequency-domain analysis methods. The results of computations using the models compare better for systems with nonlinearity being compensated by the spring force. For highly nonlinear systems the results predicted by the frequency method are too inaccurate.
5
Content available remote Experimental and Simulation Investigations of the Cantilever Beam Energy Harvester
Nowak R.
Machine Dynamics Research
|
2017
|
Vol. 41, No. 3
95--103
EN
Machines, cars and other constructions often generates harmful vibrations, which can be used as the excitement signal for the energy harvesting structures. Waste mechanical energy can be converted into the electrical energy using piezoelectric element. The harvester described in the present paper consists of cantilever steel beam with both side glued piezoelectric elements. The excitation is realized as a support harmonic movement, where the amplitude is assumed as constant. Two types of research methods are used: experiment and finite element simulations. In the first one method the harvester is attached to the electrodynamic shaker. The generated voltage and acceleration of the selected point are measured. The finite element model is proposed with material and geometrical parameters similar to the laboratory examined harvester. Also, the generator patch model takes into account the three-dimensional piezoelectric effect instead of one-dimensional, which are popular especially in mathematical modeling. The major case specified in this paper is comparison of the experiment and FEM calculations results, what ensures the correctness of the FE model. The acquired amplitude frequency and time domain characteristics of the displacement and the generated voltage are compared and discussed. The proposed and verified FE model will be used in more advanced simulations.
6
Content available Influences of system parameters on energy harvesting from autoparametric absorber. Numerical research
Mitura A., Kecik K.
Vibrations in Physical Systems
|
2016
|
Vol. 27
281--286
EN
In the paper a numerical analysis of an autoparametric system is presented. The two main elements of a tested system are the pendulum (tuned mass absorber) and an energy harvester. The electromechanical model takes into account these both effects. Numerical simulations are made in a MATLAB software environment. The obtained results allowed estimation of influence of the system parameters on efficiency of energy harvesting.
7
Content available Influences of system parameters on energy harvesting from autoparametric absorber. Experimental research
Mitura A., Kecik K.
Vibrations in Physical Systems
|
2016
|
Vol. 27
287--291
EN
In the paper an experimental analysis of an autoparametric system dedicated to vibration suppression and energy recovery is presented. The main part is an electromagnetic energy harvester. Its properties were defined by quasi static and dynamic tests. The obtained results show influence of selected parameters on energy recovery level. The experimentally identification of electromechanical coupling coefficient which couples mechanical and electrical systems is done.
8
Content available Application of shape memory alloy in harvesto-absorber system
Kęcik K.
Acta Mechanica et Automatica
|
2015
|
Vol. 9, no. 3
155--160
EN
This paper presents a conception of the harvester-absorber system consisting of two parts. The first is the pendulum attached to the main system (oscillator), which is suspended on the linear damper and the nonlinear spring made of shape memory alloy. The spring is modelled as a polynomial function based on Landau–Ginzburg theory of phase transitions (similar as ferroelectric and ferromagnets). The obtained results show, that SMA element can increase harvesting energy level, while the absorber effect can be impaired (but not loss). Additionally, introducing SMA element causes changes in dynamics, introduces a new unstable solutions and bifurcations. The analysis was done by classical integration and continuation solution methods.
9
Content available remote Ocena efektywności przetwarzania energii pola elektromagnetycznego w układzie P2110 dla pasma UHF
Tomaszewski G.
Zeszyty Naukowe Politechniki Rzeszowskiej. Elektrotechnika
|
2013
|
z. 33 [289]
287--298
PL
Celem artykułu było przedstawienie wyników badań oceny efektywności przetwarzania energii pola elektromagnetycznego w układzie P2110 firmy Powercast. W ramach omawianego zagadnienia ujęto aspekty związane z pozyskiwaniem małych ilości energii do zasilania autonomicznych układów elektronicznych o zmniejszonym zapotrzebowaniu na moc. Potencjał energetyczny otaczającego środowiska, eliminacja zagrożeń środowiskowych, a także wzrost funkcjonalności nowoczesnych systemów elektronicznych są istotnymi czynnikami przemawiającymi za opracowaniem efektywnych rozwiązań w zakresie pozyskiwania, przetwarzania oraz gromadzenia energii. Technika pozyskiwania/recyrkulacji energii (Energy Harvesting) znajduje zastosowanie w wielu różnych obszarach aktywności społeczno-gospodarczej człowieka. Na przestrzeni ostatnich lat w środowisku obserwuje się wzrost poziomu pól elektromagnetycznych, których źródłem są różnego rodzaju systemy radiokomunikacyjne. Przenoszona przez nie energia może zostać pozyskana i wykorzystana do celów niezwiązanych z funkcjonowaniem wspomnianych systemów. Obecnie brak jest efektywnych rozwiązań pozwalających na przetwarzanie energii pól o bardzo niskich poziomach przy dużym zakresie zmienności tych poziomów. Jednym z nielicznych komercyjnie dostępnych struktur realizujących taki proces jest układ P2110. W niniejszym artykule przedstawiono sposób doświadczalnego wyznaczenia sprawności przetwarzania energii przez taki układ za pomocą metody, która nie wymaga użycia zaawansowanej aparatury pomiarowej. Na potrzeby badań wygenerowano sztuczne pole elektromagnetyczne, w którym umieszczono układ pozyskujący energię – P2110. Zmiana odległości pomiędzy anteną generującą pole elektromagnetyczne, a układem P2110, umożliwiła realizację pomiarów i ocenę wpływu poziomu mocy wejściowej na sprawność przetwarzania energii w warunkach zbliżonych do rzeczywistych - aplikacyjnych. Wyniki pokazują, że układ osiąga relatywnie dużą sprawność dla poziomu mocy wejściowej wyższego niż -7 dBm. Istotny wpływ na sprawność przetwarzania ma również wartość rezystancji obciążenia. Wzrost obciążenia powoduje obniżenie wartości tego parametru.
EN
The aim of this article was to present the investigation results of the energy conversion efficiency in Powercast P2110 Powerharvester. In this subject the aspect of low power energy harvesting has been included. The energy potential of the surrounding environment, the elimination of environmental threats, as well as the increased functionality of electronic modern systems are crucial factors that suggest development effective solutions in the scope of harvesting, processing and energy storing. The energy harvesting technique is useful in many various areas of human social-economic activity. During last years, there was an increase of the electromagnetic fields level observed in the environment. These fields are produced by various types of communications systems. The energy which is transmitted can be harvested and utilized for purpose not associated with the mentioned systems. Currently, there are no effective solutions to energy conversion fields at very low power level and a high variability of these levels. One of the few commercially available solutions to convert rf energy is the Powercast P2110 Powerharvester. The experimental methods of determining energy conversion efficiency in such circuit were presented in this paper. The used methods do not require advanced measurement. The electromagnetic field was generated for research. In the created electromagnetic environment P2110 Powerharvester was placed. A change of distance between the antenna generating an electromagnetic field and P2110 Powerharvester enabled implementation of measurements and estimation the influence of input power level on the energy conversion efficiency at the condition similar to the real application conditions. According to the results, the relative high efficiency is observed for input power level greater than -7 dBm. The load resistance has a significant impact on the efficiency of the process. Generally, load increase causes a reduction in the value of of efficiency value.
10
Content available remote Universal acceleration measurement unit for energy harvesting sources
Kazubek J., Kociubiński A.
Przegląd Elektrotechniczny
|
2013
|
R. 89, nr 3b
327--329
EN
This article describes a universal acceleration measurement unit designed for measuring parameters of vibrations of different objects and with the use of the results allows modelling of energy harvesters for them. The paper presents the design of the measurement unit, the prototype and example measurements.
PL
Niniejszy artykuł przedstawia uniwersalny układ do pomiaru przyspieszeń zaprojektowany w celu pomiaru parametrów wibracji różnych obiektów. Znajomość tych parametrów pozwala na modelowanie dedykowanych źródeł energii opartych o przetworniki piezoelektryczne dla badanych źródeł.
11
Content available remote Energy harvesting of a pendulum vibration absorber
Kęcik K.
Przegląd Elektrotechniczny
|
2013
|
R. 89, nr 7
169--172
EN
This paper presents the numerical results of a pendulum vibration absorber. The system composed of the pendulum attached to the Duffing’s oscillator. The harvester is mounted in the pendulum pivot structure and consists of a cylindrical permanent magnet mounted on rotor and of four windings fixed to the housing as a stator. The obtained results show the influence of system and electrical parameters on value of induced voltage for vibration absorption conditions.
PL
W pracy przedstawiono badania numeryczne wahadłowego tłumika drgań. Układ składa się z wahadła zamocowanego na oscylatorze Duffinga. Urządzenie indukujące prąd zamocowane jest w zawieszeniu wahadła i składa się z cylindrycznego magnesu zamontowanego na rotorze i czterech uzwojeń zamontowanych na stojanie. Otrzymane wyniki pokazują indukowane napięcie w warunkach dynamicznej eliminacji drgań.
first rewind previous Strona / 1 next fast forward last
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.