Wyniki wyszukiwania - BazTech

1

Modeling of a power unit using a photovoltaic energy harvester

Dziadak Bogdan, Sabry Ahmad H., Almamoori Nawres Ali, Kucharek Mariusz

Elektronika : konstrukcje, technologie, zastosowania

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2024

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Vol. 65, Nr 1

14--18

EN

A critical parameter of IoT nodes and WSN nodes is runtime. In most cases, nodes are battery-powered. The use of Energy Harvesting based power systems in the nodes allows to extend the operating time. Modeling and simulation of circuits using Energy Harvesting makes it possible to achieve optimal circuit design before physical implementation. This article presents the design and simulation process of a power system using a micro photovoltaic panel for energy support.

PL

Krytycznym parametrem węzłów IoT oraz węzłów sieci WSN jest czas pracy. W większości przypadków węzły zasilane są w sposób bateryjny. Wykorzystanie w węzłach układów zasilania bazujących na układach Energy Harvesting pozwala wydłużyć czas pracy. Modelowanie i symulacja układów wykorzystujących Energy Harvesting pozwala na osiągniecie optymalnej konstrukcji układu przed przystąpieniem od fizycznej realizacji. W niniejszym artykule przedstawiony jest proces projektowania i symulacji układu zasilania wykorzystujący do wspomagania energetycznego mikro panel fotowoltaiczny.

2

Mikroharvester piezoelektryczny do pozyskiwania energii

Bokla Nataliia, Klymkovych Tamara, Kubiak Andrzej, Bernacki Łukasz, Lisik Zbigniew

Elektronika : konstrukcje, technologie, zastosowania

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2024

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Vol. 65, Nr 7

12--16

PL

W pracy przedstawiono wyniki prac poświęconych opracowaniu, realizacji i charakteryzacji mikroharvestera przeznaczonego do konwersji energii cieplnej w energię elektryczną. Elementy składowe mikroharvesterów, wykonane za pomocą techniki obróbki laserowej podłoży krzemowych, pozwoliły na złożenie struktur prototypowych i obserwację skutecznej generacji impulsów elektrycznych na dedykowanym stanowisku pomiarowym odzwierciedlającym potencjalne warunki pracy struktury mikroharvestera.

EN

The paper presents the results of work devoted to the development, implementation and characterization of a microharvester intended for the conversion of thermal energy into electricity. The components of microharvesters, made using laser processing of silicon substrates, allowed the assembly of prototype structures and the observation of the effective generation of electric pulses at a dedicated measurement station reflecting the potential operating conditions of the structure. (Piezoelectric microstructure for energy harvesting).

3

Generatory termoelektryczne - zasada działania, budowa, zastosowania

Żabnieńska-Góra Alina

Ciepłownictwo, Ogrzewnictwo, Wentylacja

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2024

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T. 55, nr 2

13--20

PL

Zmniejszenie emisji gazów cieplarnianych jest jednym z głównych wyzwań stojących przed ludzkością w nadchodzących latach. Dlatego celem dla naukowców i przemysłu jest poszukiwanie alternatywnych źródeł energii oraz zmniejszenia zużycia energii przez zwiększenie wydajności produkcji, dystrybucji i końcowego wykorzystania z uwzględnieniem procesów odzyskiwania energii. Technologia termoelektryczna (TE) jest uważana za alternatywną i przyjazną w odniesieniu do środowiska technologię pozyskiwania i odzyskiwania ciepła. Generatory termoelektryczne (TEG) wykorzystują efekt Seebecka do bezpośredniej konwersji ciepła w energię elektryczną. Artykuł przybliża czytelnikowi zasadę działania TEG, stosowane materiały termoelektryczne oraz możliwe zastosowania. Tym samym zwraca uwagę, na wciąż niewykorzystywany w pełni potencjał generatorów termoelektrycznych i zauważa, że dalsze prace nad rozwojem tej technologii są konieczne.

EN

Reducing greenhouse gas emissions is one of the major challenge facing humanity in the coming years. Therefore, the goal for researchers and industry is to seek alternative sources of energy and to reduce energy consumption by increasing the efficiency of production, distribution and end-use, taking into account energy recovery processes. Thermoelectric (TE) technology is considered as an alternative and environmentally friendly technology for heat harvesting and recovery. Thermoelectric generators (TEG) use the Seebeck effect to directly convert thermal energy into electrical energy. This article introduces the reader to the principle of TEG, the thermoelectric materials used and possible applications. It also draws attention to the still not fully exploited potential of thermoelectric generators and notes that further development of this technology necessary.

4

Experimental Energy Recovery from a Backpack Using Various Harvester Concepts

Kęcik Krzysztof

Advances in Science and Technology. Research Journal

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2024

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Vol. 18, no 3

67--78

EN

Energy harvesting from human body kinetics is a crucial issue. The primary challenge lies in designing and optimizing the energy converter. This paper presents an analysis of energy harvesting using three variants of electromagnetic harvesters designed for backpack integration. The first harvester comprises a single levitating magnet within a coil. The second concept involves a specially designed oscillating magnet consisting of two divided magnets with a separator. The third harvester variant utilizes two levitating magnets within the coil. The results indicate that, for harmonic excitation, the harvested power is the highest for the classical harvester with a single oscillating magnet. However, when integrated into a backpack, the concept of two levitating magnets proves to be more effective in lower speed ranges.

5

Numerical investigations on the dynamic behaviour of a 2-DOF airfoil with application in energy harvesting system

Haniszewski Tomasz, Gąska Damian, Margielewicz Jerzy, Opasiak Tadeusz

Zeszyty Naukowe. Transport / Politechnika Śląska

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2023

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z. 118

77--91

EN

This article presents the basic airfoil model with two degrees of freedom - the semi-rigid model, where its forced vibrations were considered, and the exciting force is the aerodynamic force, including its periodic changes, that is, gusts. Since the phenomenological model under study has a coupled form, its versions after decoupling are presented, which has an impact on the results of the final research. The airfoil model presented in this way was shown from the application side in the system of a simple energy harvester based on a deformable beam with piezoelectric elements. The result of the simulation tests is a preliminary analysis of the possibility of using the airfoil as a vibration generator for the energy harvesting system. Along with the application of the mechanical part, a numerical simulation of the electrical part was also implemented, related to the transformation of the voltage generated by piezoelectric elements into a constant voltage signal with a connected receiver with power consumption similar to the Atmega microcontroller with battery charging.

6

Zasilanie gwarantowane w czasie niedoborów energii

Kuczyński Karol

Rynek Instalacyjny

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2023

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Nr 12

42--46

PL

W artykule omówiono wybrane sposoby magazynowania energii elektrycznej oraz strukturę pozyskiwania energii ze źródeł odnawialnych w Polsce. Zwrócono uwagę na zasilanie odbiorców z kilku źródeł, w tym z sieci elektroenergetycznej (układy hybrydowe), w okresach niedoborów energii.

EN

The article discusses selected methods of electricity storage and the structure of obtaining energy from renewable sources in Poland. It draws attention to the power supply of consumers from several sources, including the power grid (hybrid systems), during periods of energy shortages.

7

An elliptical dipole nanoantenna with an elliptical slot for enhanced plasmonic performance

Rasheed Abdalem A., Sayidmarie Khalil H.

Przegląd Elektrotechniczny

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2023

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R. 99, nr 10

160--164

EN

The increasing interests in plasmonic nanoantennas focus on changing the resonance wavelength or field localization by changing the shape and size of the nanoantenna. A hollow elliptical dipole nanoantenna (HEDNA) is proposed by adding a slot in the two elliptical arms of the dipole nanoantenna. The plasmonic resonance wavelength and the localized field in the gap zone are increased. Moreover, the slot can be designed to enhance the overall absorption and reduce scattering. The simulations revealed that the antenna with the slot HEDNA scatters just 43% of the incident power and absorbs the remaining 57%, while the parent solid dipole scatters 90% of coupled power and absorbs the residual 10%. This represents switching from a scatterer to an absorber nanoantenna. Moreover, the achieved field enhancement in the gap region of the HEDA is more than three folds that without a slot. The proposed structure is easily applicable in sensing, thermoplasmonics, solar cells, and energy harvesting.

PL

Rosnące zainteresowanie nanoantenami plazmonicznymi koncentruje się na zmianie długości fali rezonansu lub lokalizacji pola poprzez zmianę kształtu i rozmiaru nanoanteny. Zaproponowano wydrążoną eliptyczną nanoantenę dipolową (HEDNA) poprzez dodanie szczeliny w dwóch eliptycznych ramionach nanoanteny dipolowej. Zwiększa się długość fali rezonansu plazmonowego i zlokalizowane pole w strefie szczeliny. Ponadto szczelinę można zaprojektować tak, aby zwiększyć ogólną absorpcję i zmniejszyć rozpraszanie. Symulacje wykazały, że antena ze szczeliną HEDNA rozprasza zaledwie 43% padającej mocy i pochłania pozostałe 57%, podczas gdy macierzysty stały dipol rozprasza 90% sprzężonej mocy i pochłania pozostałe 10%. Oznacza to przejście z nanoanteny rozpraszającej na nanoantenę pochłaniającą. Co więcej, osiągnięte wzmocnienie pola w obszarze szczeliny HEDA jest ponad trzykrotnie większe niż bez szczeliny. Proponowana struktura jest łatwa do zastosowania w wykrywaniu, termoplazmonice, ogniwach słonecznych i pozyskiwaniu energii.

8

Zasilanie gwarantowane w czasie niedoborów energii

Kuczyński Karol

Elektro Info

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2023

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nr 6

34--38

PL

Artykuł omawia wybrane sposoby magazynowania energii elektrycznej oraz strukturę pozyskiwania energii ze źródeł odnawialnych w Polsce. Zwraca uwagę na zasilanie odbiorców z kilku źródeł, w tym z sieci elektroenergetycznej (układy hybrydowe), w okresach niedoborów energii.

EN

The article discusses selected methods of electricity storage and the structure of obtaining energy from renewable sources in Poland. It draws attention to the power supply of consumers from several sources, including the power grid (hybrid systems), during periods of energy shortages.

9

Sposoby odzyskiwania oraz magazynowania energii w aplikacjach elektromobilnych i zasilania gwarantowanego – przegląd wybranych metod i perspektywy rozwoju

Kuczyński Karol

Elektro Info

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2023

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nr 1-2

68--71

PL

W artykule omówione zostały wybrane rozwiązania w zakresie odzyskiwania energii z otoczenia (energy harvesting – EH) i możliwości ich zastosowania w aplikacjach elektromobilnych oraz zasilania innych odbiorników energii elektrycznej.

EN

The article discusses selected solutions in the field of energy harvesting (EH) from the environment and the possibility of using them in electromobile applications and power supply.

10

Time-slot based architecture for power beam-assisted relay techniques in CR-WSNs with transceiver hardware inadequacies

Umer Mushtaq Muhammad, Jiang Hong, Zhang Qiuyun, Manlu Liu, Muhammad Owais

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2023

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Vol. 71, nr 5

art. no. e146620

EN

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.

11

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.

12

High-displacement electret-based energy harvesting system for powering leadless pacemakers from heartbeats

Maamer Bilel, Jaziri Nesrine, Said Mohamed Hadj, Tounsi Fares

Archives of Electrical Engineering

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2023

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Vol. 72, nr 1

229--238

EN

In vivo biomedical devices are one of the most studied applications for vibrational energy harvesting. In this paper, we investigated a novel high-displacement device for harvesting heartbeats to power leadless implantable pacemakers. Due to the location peculiarities, certain constraints must be respected for the design of such devices. Indeed, the total dimension of the system must not exceed 5.9 mm to be usable within the leadless pacemakers and it must be able to generate accelerations lower than 0.25 m/s2 at frequencies of less than 50 Hz. The proposed design is an electrostatic system based on a square electret of dimension 4.5 mm. It is based on the Quasi-Concertina structure, which has a very low resonant frequency of 26.02 Hz and a low stiffness of 0.492 N/m, allowing it to be very useful in such an application. Using a Teflon electret charged at 1000 V, the device was able to generate an average power of 10.06 μW at a vibration rate of 0.25 m/s2 at the resonant frequency.

13

Gravity-induced bistable 2DOF piezoelectric vibration energy harvester for broadband low-frequency operation

Liu Chaoran, Zhang Wei, Yu Kaiping, Liao Baopeng, Zhao Rui, Liu Tao

Archives of Civil and Mechanical Engineering

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2023

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Vol. 23, no. 3

art. no. e208, 2023

EN

Bistability has been proven beneficial for vibration energy harvesting. However, previous bistable harvesters are usually cumbersome in structure and are not necessarily capable of low-frequency operation. To resolve this issue, this paper proposes a compact two-degree-of-freedom (2DOF) bistable piezoelectric energy harvester with simple structure by using an inverted piezoelectric cantilever beam elastically coupled with a swinging mass-bar. The swinging mass-bar possesses bistable property due to the combined effect of the gravity and the elastic joint. It is revealed that, under the inter-well periodic motion pattern which has large swinging amplitude, the swinging mass-bar can exert large force and moment on the piezoelectric cantilever beam, thereby generating large electrical output in this process. Moreover, the inter-well periodic swinging motion can occur in a very broad low-frequency region, enabling broadband low-frequency energy harvesting. An experimental prototype is tested under harmonic excitation and sine frequency sweeping excitation; high electrical output is gained in the frequency range of 2 Hz to 12.6 Hz with a peak power of 3.558mW and a normalized power density of 19.52mW/(g2·cm3), which validates the broadband low-frequency energy harvesting capability.

14

Investigation of mechanical motion amplification for vibration energy harvesting

Satpute Nitin, Iwaniec Marek, Narina Ramesh, Satpute Sarika

Vibrations in Physical Systems

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2022

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Vol. 33, nr 1

art. no. 2022113

EN

Vibration Energy Harvesting is being investigated for autonomous sensors and actuators that mainly utilize ambient and machine induced vibrations. Recently mechanical motion amplification is incorporated for improving power to weight ratio of vibration harvesters. The present study is motivated to investigate mechanical motion amplification characteristics with different configurations. The parameters investigated are motion amplification ratio, force transmissibility characteristics, weight of the electrical generator, effective damping coefficient achieved and linear nature of damping. Numerical analysis has been performed to compare important characteristics of device operating without amplification to that of with amplification with different configuration. The study has been concluded with comments on application of suitable type of amplification mechanism depending on weight/space constraints and desired effective damping coefficient.

15

System do oceny mikrogeneratorów termoelektrycznych w szerokim zakresie temperatury

Wójcik Szymon, Gierczak Mirosław

Przegląd Elektrotechniczny

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2022

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R. 98, nr 4

131--135

PL

W artykule przedstawiono system pomiarowy, który umożliwia charakteryzowanie mikrogeneratorów termoelektrycznych przy gradiencie temperatury poczynając od -50 °C. Pozwala to na badanie mikrogeneratorów pod kątem zastosowań w ekstremalnych warunkach, gdzie dostęp do energii elektrycznej jest ograniczony.

EN

The paper presents a measurement system that enables the characterization of thermoelectric microgenerators at a temperature gradient starting from -50 ° C. This allows the testing of microgenerators for applications in extreme conditions where access to electricity is limited.

16

Auto-wireless battery charging system for medical and healthcare applications

Al-Nabulsi Jamal I, Owida Hamza Abu, Turab Nidal M., Moh’d Bashar Al-haj

Przegląd Elektrotechniczny

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2022

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R. 98, nr 8

128--131

EN

The explosive growth of smart wearable devices has led to significant interest in harvesting human motion energy, especially during walking, for clinical and health purposes. The use of such energy offers a feasible way forward to significantly surpass the battery power limits for implantable and wearable devices. In this study, a complete system is designed to produce electrical energy from human walking then transfer the generated power wirelessly to the intended distance to charge a portable device without the need to substitute the power sources. Lead Zerconate Titanate (PZT)-5H has been implemented with customised specifications to estimate and harvest energy in one step. The obtained experimental results of the generated and stored energy using the proposed design agree with the theoretical results obtained through the calculations. Further investigations are required to improve the proposed system.

PL

Gwałtowny rozwój inteligentnych urządzeń do noszenia doprowadził do znacznego zainteresowania pozyskiwaniem energii ruchu człowieka, zwłaszcza podczas chodzenia, do celów klinicznych i zdrowotnych. Wykorzystanie takiej energii oferuje realny sposób na znaczne przekroczenie limitów mocy baterii dla urządzeń wszczepialnych i noszonych na ciele. W tym badaniu zaprojektowano kompletny system do wytwarzania energii elektrycznej podczas chodzenia ludzi, a następnie bezprzewodowego przesyłania wytworzonej energii na zamierzoną odległość w celu naładowania przenośnego urządzenia bez konieczności zastępowania źródeł zasilania. Lead Zerconate Titanate (PZT)-5H został wdrożony ze spersonalizowanymi specyfikacjami, aby oszacować i zebrać energię w jednym kroku. Otrzymane wyniki doświadczalne energii wytworzonej i zmagazynowanej przy zastosowaniu proponowanej konstrukcji zgadzają się z wynikami teoretycznymi uzyskanymi w wyniku obliczeń. Konieczne są dalsze badania w celu ulepszenia proponowanego systemu.

17

Mechanical vibrations: recent trends and engineering applications

Garus Sebastian, Błachowski Bartłomiej, Sochacki Wojciech, Jaskot Anna, Kwiatoń Paweł, Ostrowski Mariusz, Šofer Michal, Kapitaniak Tomasz

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2022

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Vol. 70, nr 1

art. no. e140351

EN

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.

18

Outage Performance of Full-Duplex Dual-hop Relaying System With Energy Harvesting Using Fountain Codes

Vo Gia-Thinh, Viet Nguyen Hoanh, Hoai Nguyen Thi Thanh, Hung Dang The, Viet Nguyen Hong

Annals of Computer Science and Information Systems

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2022

|

Vol. 33

43--47

EN

In this paper, we consider a dual-hop relaying network exploiting fountain codes, where a source node and a destination node are single antenna, while a relay node is equipped two antennas. Moreover, the relay node is a energy constrained device, so it must harvest the radio frequency signals of the source to assist the data transmission from the source to the destination with full-duplex mode to increase double channel capacity. We evaluate the performance of the system through the derived exact outage probability expression over Rayleigh fading channels. Finally, Monte-Carlo simulations are performed to verify the theoretical results of the proposed protocol.

19

On the Performance of Cellular Networks with Adaptive Modulation and Energy Harvesting : A Stochastic Geometry Approach

Ho Nhut-Minh, Phan Thanh-Toan, Nguyen Sang Quang, Tu Lam-Thanh

Annals of Computer Science and Information Systems

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2022

|

Vol. 33

115--120

EN

The performance of ultra-dense cellular networks considering both adaptive discrete modulation (ADM) and energy harvesting (EH) is investigated. Particularly, mobile users (MUs) are charged its battery from all ambient radio frequency (RF) signals. Based on the amount of harvested energy as well as the channel conditions, MU will actively choose an appropriate modulation scheme that not only maximizes the rate but also satisfies the quality-of-service (QoS). Moreover, we consider the spatial-temporal correlation at the signal-to-interference-plus-noise ratios (SINRs) of base stations (BSs) which are totally different from work in the literature. Several important metrics are investigated such as, occurrence probabilities of different modulation schemes (Poc), coverage probability (Pcov), and achievable spectral efficiency (ASE). Finally, the results highlight the superiority of the proposed scheme compared to the conventional fixed modulation

20

Assessment of the role of structural nonlinearity in galloping energy harvesters

Sarbinowski Filip, Starosta Roman

Vibrations in Physical Systems

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2021

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Vol. 32, nr 2

art. no. 2021209

EN

The study compares different variants of aeroelastic energy harvesters due to the power they generate. For this purpose, models of devices with different stiffness characteristics were prepared: linear, nonlinear, with combined stiffness and bistable. Then, using the authorial procedure, analytical expressions that describe the power of each system were determined and the influence of individual parameters on this quantity was examined. By way of optimization, the system parameters have been selected in such a way that, regardless of the flow velocity, each of them generates the maximum possible power. Based on the results obtained in this way, the advisability of using a device with combined stiffness and bistable characteristics was rejected. Moreover, it was pointed out that the linear system would provide greater efficiency for lower flow velocities.