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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.
2
Content available remote Auto-wireless battery charging system for medical and healthcare applications
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.
3
Content available remote Assessment of the role of structural nonlinearity in galloping energy harvesters
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.
PL
W artykule omówiono wybrane zagadnienia związane z pozyskiwaniem energii odpadowej w budynkach, transformowaniem jej w energię elektryczną oraz wykorzystaniem na potrzeby zasilania zdalnych, bezbateryjnych platform czujnikowych, wykorzystujących komunikację radiową. Układy czujnikowe instalowane w budynkach najczęściej pozyskują dane dotyczące temperatury oraz wilgotności powietrza, obecności osób w pomieszczeniu, sygnału otwarcia okien, itp. Często są to dane strategiczne, niezbędne do prawidłowej pracy układów automatyki budynkowej i bezpośrednio wpływające na komfort oraz bezpieczeństwo osób przebywających w budynku a także na redukcję zapotrzebowania budynku na energię.
XX
The article discusses selected issues related to the acquisition of ambient energy in buildings, its transformation into electricity and use for power supply of remote, battery-free sensor platforms using radio communication. Sensor systems installed in buildings most often acquire data concerning temperature and humidity of air, presence of people in a room, window opening signals, etc. These are often strategic data, necessary for the correct operation of building automation systems and directly influencing not only the comfort and safety of people in the building but also a significant reduction in the building's energy demand.
EN
The paper describes the procedure of modelling and optimization of the aeroelastic energy harvester from the point of view of their operation at very low flow velocities. Using analytical solutions of models of different device variants, the relationships between their efficiency and flow velocity were presented. By way of analytical considerations, the conditions for high performance operation of the device have been demonstrated, indicating at the same time the difficulty in maintaining it at low operation velocities. As a solution to the problem, the application of external delayed feedback control was proposed and its effectiveness was demonstrated.
EN
Energy harvesting shock absorbers can generate about 15-20 W of electric power for normal suspension velocities. However, higher weight, fail safe characteristics and space limitations have restricted development of regenerative shock absorbers to research prototypes. Power to weight ratio of regenerative shock absorbers can be improved by incorporating motion amplification. In the presented work, an innovative design of energy harvesting shock absorber has been presented that uses motion amplification for improving harvesting efficiency. Apart from improving electric power, the proposed solution is fail safe and can be easily incorporated in existing vehicles with only marginal change in suspension layout. Study includes detailed numerical analysis for vibration transmissibility to investigate comfort and safety. Further, a prototype has been fabricated and experimentation has been performed to compute electric power generated and comfort. Simulations have been performed on real size model with utilization of harvested electric power which indicates about 19% of overall harvesting efficiency.
PL
Zaprezentowano laboratoryjny model zdalnego, mikroelektronicznego układu czujnikowego, zasilanego z hybrydowego, elektrostatyczno-piezoelektrycznego harvestera energii, współpracującego z koncentrycznym kondensatorem tubowym, instalowanym na linii napowietrznej. Układ ten przetestowano na modelu jednofazowej linii przesyłowej SN przy napięciu do 60 kV. Opracowany samowystarczalny energetycznie system pomiarowy stanowi element globalnej sieci IoT, przystosowany do integracji z rozwiązaniami informatycznymi Smart Grid.
EN
The paper presents a laboratory model of a remote microelectronic sensor devices, supplied by a hybrid electrostatic-piezoelectric energy harvester, accommodated in a coaxial capacitor installed on the overhead transmission line. The system was laboratory-tested using a model of single-phase overhead transmission line up to 60 kV. Developed energy self-sufficient system is part of a global IoT network, suitable for integration with smart power grid IT solutions.
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