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    Wyświetlanie 1-6 z 6
    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:
    Development board of the autonomous semi-passive RFID transponder
    Autorzy:
    Jankowski-Mihułowicz, P.
    Węglarski, M.
    Pitera, G.
    Kawalec, D.
    Lichoń, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/201726.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    RFID
    semi-passive transponder
    energy harvesting
    sensors
    development board
    semi-pasywny transponder
    zbieranie energii
    czujniki
    Opis:
    The idea of multiband development board designed to support and advance the technique of battery-less autonomous semi-passive RFID transponders is presented in the paper. The extra function of harvesting energy from the electromagnetic field of different radio communications systems, the ultra efficient power conditioner and the energy storage block are applied in the proposed construction. The facility of utilizing gathered energy is provided to support designers in developing applications of automatic object identification. Since the evaluation board is to work without a galvanic cell, the particular emphasis is put on the mechanisms that improve energy efficient operation of the whole electronic circuit. The construction principles and operation modes (charging, cold start, sleep with charging, sleep, measurement and cut-off) of the storage unit are described in depth in the paper. The preproduction batch of the demonstrators has been manufactured on automated assembly line at ELMAK Ltd. Company, according to the elaborated model. It confirms that the author’s demonstrator of the battery-less autonomous semi-passive transponder can be reproduced on an industrial scale. On the basis of the preproduction series, the performance parameters of the final product have been estimated. The presented study should significantly contribute to the RFID technique therefore the authors set up the evaluation process of marketing research and product commercialization.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2016, 64, 3; 647-654
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanical vibrations: recent trends and engineering applications
    Autorzy:
    Garus, Sebastian
    Błachowski, Bartłomiej
    Sochacki, Wojciech
    Jaskot, Anna
    Kwiatoń, Paweł
    Ostrowski, Mariusz
    Šofer, Michal
    Kapitaniak, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/2090733.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    mechanical vibration
    energy harvesting
    modal analysis
    granular materials
    wibracje mechaniczne
    zbieranie energii
    analiza modalna
    materiały ziarniste
    Opis:
    Although the study of oscillatory motion has a long history, going back four centuries, it is still an active subject of scientificr esearch. In this review paper prospective research directions in the field of mechanical vibrations were pointed out. Four groups of important issues in which advanced research is conducted were discussed. The first are energy harvester devices, thanks to which we can obtain or save significant amounts of energy, and thus reduce the amount of greenhouse gases. The next discussed issue helps in the design of structures using vibrations and describes the algorithms that allow to identify and search for optimal parameters for the devices being developed. The next section describes vibration in multi-body systems and modal analysis, which are key to understanding the phenomena in vibrating machines. The last part describes the properties of granulated materials from which modern, intelligent vacuum-packed particles are made. They are used, for example, as intelligent vibration damping devices.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2022, 70, 1; e140351, 1--12
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Propozycje zastosowania czujników samozasilających się w przemyśle wydobywczym
    Proposals of application of self-energizing sensors in the mining industry
    Autorzy:
    Jasiulek, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/164594.pdf
    Data publikacji:
    2014
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Górnictwa
    Tematy:
    czujnik samozasilający
    zbieranie energii
    mechatronika
    układ sterowania
    dyrektywa ATEX
    atmosfera wybuchowa
    self-energizing sensor
    energy harvesting
    mechatronics
    control system
    ATEX (ATmosphere EXplosible)
    Opis:
    W artykule przedstawiono perspektywę zastosowania czujników samozasilających się, wykorzystujących energię drgań lub energię cieplną do monitorowania wybranych parametrów maszyn górniczych. Obecnie, szczególnie w zakresie monitorowania maszyn i inteligentnych budynków, coraz częściej stosowane są czujniki z „auto-zasilaniem”. Sensory do zasilania swoich struktur wykorzystują zjawiska fizyczne, takie jak: przepływ ciepła, energię drgań lub światła (ang. energy harvesting – pozyskiwanie energii). Analiza takich rozwiązań wykazała, że istnieją możliwości zastosowania tej technologii w systemach automatyki oraz diagnostyki maszyn i urządzeń górniczych. W artykule przedstawiono perspektywy wdrożenia systemu czujników samozasilających w odniesieniu do maszyn stosowanych w przestrzeniach zagrożonych wybuchem metanu i/lub pyłu węglowego.
    This paper presents the prospects of application of self-energizing sensors which use the point or thermal energy to monitor selected parameters of mining machines. Currently, more and more often mainly in monitoring of machines and Building Management Systems (intelligent buildings) there are self-energizing sensors applied. The sensors use the following physical phenomena to reinforce their structures: flow of heat, point or light energy. Analysis of such solutions shows there are possibilities to apply this technology in automation systems and diagnostics of machines and mining equipment. This paper presents the prospect of implementation of self-energizing sensor systems in relation to the machines used in areas prone to methane and/or coal dust explosion.
    Źródło:
    Przegląd Górniczy; 2014, 70, 1; 9-15
    0033-216X
    Pojawia się w:
    Przegląd Górniczy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Time-slot based architecture for power beam-assisted relay techniques in CR-WSNs with transceiver hardware inadequacies
    Autorzy:
    Umer, Mushtaq Muhammad
    Jiang, Hong
    Zhang, Qiuyun
    Manlu, Liu
    Muhammad, Owais
    Powiązania:
    https://bibliotekanauki.pl/articles/27311438.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    cognitive radio WSNs
    energy harvesting
    DF relaying
    relay selection schemes in WSNs
    hardware inadequacy in WSNs
    wireless sensor networks
    zbieranie energii
    bezprzewodowa sieć czujników
    WSN
    sieci radia kognitywnego
    przekaz DF
    bezprzewodowe sieci sensoryczne
    Opis:
    Over the past two decades, numerous research projects have concentrated on cognitive radio wireless sensor networks (CR-WSNs) and their benefits. To tackle the problem of energy and spectrum shortfall in CR-WSNs, this research proposes an underpinning decode-&-forward (DF) relaying technique. Using the suggested time-slot architecture (TSA), this technique harvests energy from a multi-antenna power beam (PB) and delivers source information to the target utilizing energy-constrained secondary source and relay nodes. The study considers three proposed relay selection schemes: enhanced hybrid partial relay selection (E-HPRS), conventional opportunistic relay selection (C-ORS), and leading opportunistic relay selection (L-ORS). We present evidence for the sustainability of the suggested methods by examining the outage probability (OP) and throughput (TPT) under multiple primary users (PUs). These systems leverage time switching (TS) receiver design to increase end-to-end performance while taking into account the maximum interference constraint and transceiver hardware inadequacies. In order to assess the efficacy of the proposed methods, we derive the exact and asymptotic closed-form equations for OP and TPT & develop an understanding to learn how they affect the overall performance all across the Rayleigh fading channel. The results show that OP of the L-ORS protocol is 16% better than C-ORS and 75% better than E-HPRS in terms of transmitting SNR. The OP of L-ORS is 30% better than C-ORS and 55% better than E-HPRS in terms of hardware inadequacies at the destination. The L-ORS technique outperforms C-ORS and E-HPRS in terms of TPT by 4% and 11%, respectively.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2023, 71, 5; art. no. e146620
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effective harvesting of braking energy in electric cars
    Autorzy:
    Trzaska, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/242744.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    urban transport
    environmental protection
    electric cars
    energy harvesting
    braking energy recovering
    damping energy recovering
    supercapacitor
    simulation
    transport miejski
    ochrona środowiska
    samochody elektryczne
    zbieranie energii
    odzyskiwanie energii hamowania
    odzyskiwanie energii tłumienia
    superkondensator
    symulacja
    Opis:
    Regenerative braking and damping are effective approaches for electric cars to extend their driving range. A disk Faraday generator regenerative braking strategy integrated with controlled charging of a supercapacitor is developed in this article to advance the level of energy-savings on the car board. The kinetic energy of the car suspension during driving regenerated effectively to electric energy by using shock absorber is harvested and then used to charge the vehicle’s battery, the power electronics and the supercapacitor. One of the advantages of supercapacitors is their high power capability, which is applicable for high rate of charging and discharging operations like motor starting and regenerative braking of an electric vehicle. This article presents a new charging method for supercapacitors. Common for regenerative braking and damping chargers for supercapacitors are usually equipped with electronic PWM converter performing two states of operation per switching cycle. A simple open-loop control system is applicable for the whole charging state. The proposed circuit consists of a minimum number of components. It is free of stability problem and protects itself from being overloaded by supercapacitor with zero initial charge. Simulation results for regenerative braking processes corresponding to three velocity tests are included.
    Źródło:
    Journal of KONES; 2018, 25, 1; 407-422
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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