Готові списки джерел за темами / Point absorber technology

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Автор: Grafiati
Опубліковано: 14 березня 2023

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Статті в журналах з теми "Point absorber technology"

1

Khasawneh, Mohammad A., and Mohammed F. Daqaq. "Internally-resonant broadband point wave energy absorber." Energy Conversion and Management 247 (November 2021): 114751. http://dx.doi.org/10.1016/j.enconman.2021.114751.

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2

Hogan, R. E., and R. D. Skocypec. "Analysis of Catalytically Enhanced Solar Absorption Chemical Reactors: Part I—Basic Concepts and Numerical Model Description." Journal of Solar Energy Engineering 114, no. 2 (May 1, 1992): 106–11. http://dx.doi.org/10.1115/1.2929987.

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Анотація:
A detailed numerical model is presented for high-temperature, catalytically enhanced, solar absorption chemical reactors. In these reactors, concentrated solar energy is volumetrically absorbed throughout a porous absorber matrix impregnated with a catalyst. The catalyst promotes heterogeneous reactions with fluid-phase reactant species flowing through the absorber. This paper presents a description of a numerical model and the basic concepts of reactor operation. The numerical model of the absorber includes solar and infrared radiation, heterogeneous chemical reactions, conduction in the solid phase, and convection between the fluid and solid phases. The model is nonlinear primarily due to both the radiative transfer and the heterogeneous chemistry occurring in the absorber. The nonlinear two-point boundary value problem is solved using superposition with orthonormalization and an adaptive solution point scheme. This technique preserves accuracy throughout the domain. The model can be modified for other chemical reactions and can be simplified to model volumetric air-heating receivers.
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3

Alamian, Rezvan, Rouzbeh Shafaghat, and Mohammad Reza Safaei. "Multi-Objective Optimization of a Pitch Point Absorber Wave Energy Converter." Water 11, no. 5 (May 9, 2019): 969. http://dx.doi.org/10.3390/w11050969.

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In this paper, a pitch point absorber wave energy converter (WEC) is selected in order to be optimized for the wave characteristics of the Caspian Sea. The optimization process is a multi-objective optimization. For achieving the optimal WEC, mean absorbed power should be maximized while the construction cost should be minimized. The submerged surface area of the WEC is selected as a cost parameter. The amount of mean absorbed power depends on the installation site and also the shape of the WEC. For optimizing the shape of the WEC, various shapes are considered which are categorized into three different sections. A multi-objective genetic algorithm is used for optimization of the model, and the NEMOH software is used to simulate the wave-body interaction. The results show that the bottom flat and upside chamfered geometry with X:Y ratio of 10:1 is the best geometry for the desired application. Comparing the results from the final optimized shape with the optimized basic parallelepipedic hull shape reveals that much more extractable power can be achieved with less cost.
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4

Geehan, Genevieve, Ritika Ritika, and Coen Winchester. "Impact of Nanofluids and Specific Frequency Absorbers in Parabolic Trough Collector Solar Furnaces." PAM Review Energy Science & Technology 5 (May 31, 2018): 89–103. http://dx.doi.org/10.5130/pamr.v5i0.1502.

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This meta-study aims to identify methods of optimising the efficiency of upcoming parabolic trough collector (PTC) solar furnace technology by analysing thermodynamic properties of both solar absorbers: SiC, Pyromark 2500, Polychromic Al-AlN and C54-TiSi2 nanoparticles; and heat transfer nanofluids: SiO2, TiO2, Al2O3, Cu and Al2O3-Cu with a 50:50 ratio. The thermodynamic properties investigated are energy absorbance and emittance, melting point, thermal conductivity and viscosity. Our study revealed that the optimal transfer fluid is the hybrid nanofluid Al2O3-Cu with a 50:50 ratio and a 1-2% volume fraction in an ethylene glycol base. The optimal solar absorber for use in combination with this nanofluid was found to be polychromic Al-AlN cerment absorber.
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5

Guo, Bingyong, Tianyao Wang, Siya Jin, Shunli Duan, Kunde Yang, and Yaming Zhao. "A Review of Point Absorber Wave Energy Converters." Journal of Marine Science and Engineering 10, no. 10 (October 19, 2022): 1534. http://dx.doi.org/10.3390/jmse10101534.

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Анотація:
There are more than thousands of concepts for harvesting wave energy, and wave energy converters (WECs) are diverse in operating principles, design geometries and deployment manners, leading to misconvergence in WEC technologies. Among numerous WEC devices, the point absorber wave energy converter (PAWEC) concept is one of the simplest, most broad-based and most promising concepts that has been investigated intensively all over the world. However, there are only a few reviews focusing on PAWECs, and the dynamical advancement of PAWECs merits an up-to-date review. This review aims to provide a critical overview of the state of the art in PAWEC development, comparing and contrasting various PAWEC devices and discussing recent research and development efforts and perspectives of PAWECs in terms of prototyping, hydrodynamic modelling, power take-off mechanism and control.
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6

A., Elakkiya, Radha Sankararajan, Sreeja B.S., and Manikandan E. "Modified I-shaped hexa-band near perfect terahertz metamaterial absorber." Circuit World 46, no. 4 (July 16, 2020): 281–84. http://dx.doi.org/10.1108/cw-11-2019-0155.

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Purpose A novel and simple six-band metamaterial absorber is proposed in the terahertz region, which is composed of an I-shaped absorber and circular ring with four gaps and a continuous metal ground plane separated by only 0.125 mm polyimide dielectric substrate. Initially, I-shaped resonator gives three bands at 0.4, 0.468 and 0.4928 THz with the absorptivity of 99.3%, 97.9% and 99.1%, respectively. The purpose of this paper is to improve the number of bands, for which the authors added the circular ring with four gaps, so the simulated metamaterial absorber exhibited six absorption peaks at 0.3392, 0.3528, 0.3968, 0.4676, 0.4768 and 0.492 THz, with the absorption rate of 91.4%, 94.2%, 94.9%, 90.3%, 77.5% and 97.4%, respectively. The surface current distribution and angle independence are explained for all the six frequencies which are used to analyze the absorption mechanism clearly. Structure maximum uses the squares and circles, so it will make the fabrication easy. The multiband absorbers obtained here have potential applications in many engineering technology, thermal radiation, material detection and imaging and optoelectronic areas. Design/methodology/approach This paper presents the design of the six-band metamaterial absorber which is from the I-shaped resonator and circular ring with four gaps and the metallic ground plane separated by the 0.125 polyimide dielectric substrate. The absorber exhibited six absorption peaks at 0.3392, 0.3528, 0.3968, 0.4676, 0.4768 and 0.492 THz, with the absorption rate of 91.4%, 94.2%, 94.9%, 90.3%, 77.5% and 97.4%, respectively. From the fabrication point of view, the proposed six-band metamaterial absorber has a very simple geometrical structure, and it is very easy to be fabricated. Findings The authors present a new and simple design of six-band absorber based on an I-shaped absorber and circular ring with four gaps and a metallic ground plane separated by a polyimide layer having the thickness of 0.125 mm. Six different resonance absorption peaks are found at 0.3392, 0.3528, 0.3968, 0.4676 , 0.4768 and 0.492 THz. Surface current distribution and angle independence plot have been studied to understand the absorption behavior of the designed terahertz metamaterial absorber. Originality/value The multiband absorbers obtained here have potential applications in many engineering technology, thermal radiation, material detection, security, sensors, imaging and optoelectronic areas.
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7

Xu, Pengfei, Chenbo Han, Tao Lv, and Hongxia Cheng. "Underwater Absorber for a Remotely Operated Vehicle." Journal of Marine Science and Engineering 10, no. 4 (April 1, 2022): 485. http://dx.doi.org/10.3390/jmse10040485.

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Fixed-point underwater hovering is a key technology for the reliable operation of a remotely operated vehicle in the ocean to inspect the surfaces of a variety of underwater structures, such as ports and offshore wind power facilities. This study proposes an underwater wall absorber that can be used in remotely operated vehicles. First, we explain the working principle of the underwater absorber. Second, we analyze the main factors affecting its adsorption performance by using numerical simulations. Finally, we show the results of a tested prototype of the proposed absorber, whose performance was consistent with the results of numerical calculations. The proposed absorber may have important technical prospects for use in remotely operated underwater vehicles.
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8

Pierart, Fabián G., Joaquín Fernandez, Juan Olivos, Roman Gabl, and Thomas Davey. "Numerical Investigation of the Scaling Effects for a Point Absorber." Water 14, no. 14 (July 7, 2022): 2156. http://dx.doi.org/10.3390/w14142156.

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In order to design and evaluate the behaviour of a numerically optimised wave energy converter (WEC), a recommended procedure is to initially study small scale models in controlled laboratory conditions and then progress further up until the full-scale is reached. At any point, an important step is the correct selection of the wave theory to model the dynamical behaviour of the WEC. Most authors recommend the selection of a wave theory based on dimensional parameters, which usually does not consider the model scale. In this work, the scale effects for a point absorber are studied based on numerical simulations for three different regular waves conditions. Furthermore, three different wave theories are used to simulate two scales 1:1 and 1:50. The WEC-wave interaction is modelled by using a numerical wave tank implemented in ANSYS-Fluent with a floating object representing the WEC. Results show that the normalised difference between 1:1 and 1:50 models, keeping the same wave theory fluctuate between 30% and 58% of the WEC heave motion and that a wrong selection of the wave theory can lead to differences up to 138% for the same variable. It is also found that the limits for the use of wave theories depends on the particular model and that the range of applicability of different theories can be extended.
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Sun, Ke, Yang Yi, Xiongbo Zheng, Lin Cui, Chuankai Zhao, Mingyao Liu, and Xiang Rao. "Experimental investigation of semi-submersible platform combined with point-absorber array." Energy Conversion and Management 245 (October 2021): 114623. http://dx.doi.org/10.1016/j.enconman.2021.114623.

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Quartier, Nicolas, Pablo Ropero-Giralda, José M. Domínguez, Vasiliki Stratigaki, and Peter Troch. "Influence of the Drag Force on the Average Absorbed Power of Heaving Wave Energy Converters Using Smoothed Particle Hydrodynamics." Water 13, no. 3 (February 2, 2021): 384. http://dx.doi.org/10.3390/w13030384.

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Анотація:
In this paper, we investigated how the added mass, the hydrodynamic damping and the drag coefficient of a Wave Energy Converter (WEC) can be calculated using DualSPHysics. DualSPHysics is a software application that applies the Smoothed Particle Hydrodynamics (SPH) method, a Lagrangian meshless method used in a growing range of applications within the field of Computational Fluid Dynamics (CFD). Furthermore, the effect of the drag force on the WEC’s motion and average absorbed power is analyzed. Particularly under controlled conditions and in the resonance region, the drag force becomes significant and can greatly reduce the average absorbed power of a heaving point absorber. Once the drag coefficient has been determined, it is used in a modified equation of motion in the frequency domain, taking into account the effect of the drag force. Three different methods were compared for the calculation of the average absorbed power: linear potential flow theory, linear potential flow theory modified to take the drag force into account and DualSPHysics. This comparison showed the considerable effect of the drag force in the resonance region. Calculations of the drag coefficient were carried out for three point absorber WECs: one spherical WEC and two cylindrical WECs. Simulations in regular waves were performed for one cylindrical WEC with two different power take-off (PTO) systems: a linear damping and a Coulomb damping PTO system. The Coulomb damping PTO system was added in the numerical coupling between DualSPHysics and Project Chrono. Furthermore, we considered the optimal PTO system damping coefficient taking the effect of the drag force into account.
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Більше джерел

Дисертації з теми "Point absorber technology"

1

Östbom, Lykke. "Device Resonance Response in a Wave Energy Converter : Investigation of Surge Resonance in a Heaving Point Absorber." Thesis, Uppsala universitet, Elektricitetslära, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-433389.

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Wave power possesses vast potential to become a considerable energy contributor. The main challenge for wave power to become competitive on the energy market is to minimize the delivered energy cost simultaneously as designing a wave energy converter (WEC) strong enough to survive extreme sea conditions. The Swedish company CorPower Ocean is developing a heaving WEC that converts the emerged relative heave motion to electricity. CorPower Ocean minimizes the delivered energy cost by letting the WEC resonate with the incoming wave providing maximization of the annual energy output. However, system characteristics of the WEC structure can produce resonance in other modes than heave which might affect the energy performance. This thesis targeted the device resonance response in CorPower Ocean’s WEC in the surge mode. More specifically, the thesis investigated, through simulation, when resonance in surge occurs and whether the impacts of the resonance should be mitigated. The results indicated that the WEC is resonant in surge when the incident wave has a period between 6.5-10.5 s and 13.5-19 s. Moreover, the WEC is resonant in surge when the oscillation period in surge is 15-17 s. The surge resonance period and its bandwidth increase for higher wave loads. The surge resonance is negatively affecting the heave motion and the WEC’s performance. It is not exactly known what in the structure that causes surge resonance.Two methods were used, results from one method showed tendencies that the mooring system was the instigator of the surge resonance, however, that could not be confirmed.
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2

DAFNAKIS, PANAGIOTIS. "Study of a point absorber wave energy converter technology: modeling, simulation, control and experimental validation of the system." Doctoral thesis, Politecnico di Torino, 2021. http://hdl.handle.net/11583/2945183.

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Eriksson, Mikael. "Modelling and Experimental Verification of Direct Drive Wave Energy Conversion : Buoy-Generator Dynamics." Doctoral thesis, Uppsala universitet, Elektricitetslära, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-7785.

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This thesis is focused on development of models and modelling of a wave energy converter in operation. Through the thesis linear potential wave theory has been used to describe the wave-buoy interaction. The differences lie in the generator models, in the simplest model the generator is a mechanical damper characterized by a damping factor. In the most advanced generator model the magnetic fields is calculated the by a FE-method, which gives detailed description of the electric properties and the effect it has on the buoy dynamics. Moreover, an equivalent circuit description of the generator has been tested. It has the same accuracy as the field based model but with a strongly enhanced CPU time. All models are verified against full scale experiments. The models are intended to be used for design of the next generation wave energy converters. Further, the developed models have also been used to study what effect buoy geometry and generator damping have on the ability to energy absorption. In the spring 2006 a full scale wave energy converter was installed at the west coast of Sweden. It was in operation and collected data during three months. During that period the load resistance was varied in order to study the effect on the energy absorption. These collected data was then used in the verification of the developed models. In the year 2002 a wave energy project started at Uppsala University; this work is a part of that larger project which intendeds to develop a viable wave energy conversion concept.
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4

Afonja, Adetoso J. "Dynamics of Pitching Wave Energy Converter with Resonant U-Tank Power Extraction Device." Thesis, Virginia Tech, 2020. http://hdl.handle.net/10919/98782.

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This research revolves around the concept design and theoretical validation of a new type of wave energy converter (WEC), comprising a pitching floater integrated with a resonant U-tank (RUT) and a Wells turbine as power take-off (PTO). Theoretical formulation of a fully coupled multi-body dynamic system, incorporating the thermodynamic processes of the RUT air chamber, its interaction with the PTO dynamics and their coupling with the floater is presented. Inaccuracies of the dynamic modeling of RUT based on Lloyd's low order model, which assumes constant hydrodynamic parameters irrespective of the frequency, are demonstrated by a series of high fidelity CFD simulations. These simulations are a systematic series of fully viscous turbulent simulations, using unsteady RANSE solvers, of the water sloshing at different frequencies of oscillation. Calibration of Lloyd’s model with CFD results evidenced that the RUT hydrodynamic parameters are not invariant to frequency. A numerical model was developed based on Simulink WEC-Sim libraries to solve the non-linear thermo-hydrodynamic equations of the device in time domain. For power assessment, parametric investigations are conducted by varying the main dimensions of the RUT and power RAOs were computed for each iteration. Performance in irregular sea state are assessed using a statistical approach with the assumption of linear wave theory. By superimposing spectrum energy density from two resource sites with RAO, mean annual energy production (MEAP) are computed. The predicted MEAP favorably compares with other existing devices, confirming the superior efficiency of the new proposed device over a larger range of incident wave frequency.
M.S.
This study present results of an investigation into a new type of wave energy converter which can be deployed in ocean and by its pitch response motion, it can harvest wave energy and convert it to electrical energy. This device consist of a floater, a U-tank (resonant U-tank) with sloshing water free to oscillate in response to the floater motion and a pneumatic turbine which produces power as air is forced to travel across it. The pneumatic turbine is used as the power take-off (PTO) device. A medium fidelity approach was taken to carry out this study by applying Lloyd’s model which describes the motion of the sloshing water in a resonant U-tank. Computational fluid dynamics (CFD) studies were carried out to calibrate the hydrodynamic parameters of the resonant U-tank as described by Lloyd and it was discovered that these parameters are frequency dependent, therefore Lloyd’s model was modelled to be frequency dependent. The mathematical formulation coupling the thermodynamic evolution of air in the resonant U-tank chamber, modified Lloyd’s sloshing water equation, floater dynamics and PTO were presented for the integrated system. These set of thermo-hydrodynamic equations were solved with a numerical model developed using MATLAB/Simulink WEC-Sim Libraries in time domain in other to capture the non-linearity arising from the coupled dynamics. To assess the annual energy productivity of the device, wave statistical data from two resource sites, Western Hawaii and Eel River were selected and used to carrying out computations on different iterations of the device by varying the tank’s main dimensions. This results were promising with the most performing device iteration yielding mean annual energy production of 579 MWh for Western Hawaii.
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5

Lindroth, [formerly Tyrberg] Simon. "Buoy and Generator Interaction with Ocean Waves : Studies of a Wave Energy Conversion System." Doctoral thesis, Uppsala universitet, Elektricitetslära, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-160085.

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Анотація:
On March 13th, 2006, the Division of Electricity at Uppsala University deployed its first wave energy converter, L1, in the ocean southwest of Lysekil. L1 consisted of a buoy at the surface, connected through a line to a linear generator on the seabed. Since the deployment, continuous investigations of how L1 works in the waves have been conducted, and several additional wave energy converters have been deployed. This thesis is based on ten publications, which focus on different aspects of the interaction between wave, buoy, and generator. In order to evaluate different measurement systems, the motion of the buoy was measured optically and using accelerometers, and compared to measurements of the motion of the movable part of the generator - the translator. These measurements were found to correlate well. Simulations of buoy and translator motion were found to match the measured values. The variation of performance of L1 with changing water levels, wave heights, and spectral shapes was also investigated. Performance is here defined as the ratio of absorbed power to incoming power. It was found that the performance decreases for large wave heights. This is in accordance with the theoretical predictions, since the area for which the stator and the translator overlap decreases for large translator motions. Shifting water levels were predicted to have the same effect, but this could not be seen as clearly. The width of the wave energy spectrum has been proposed by some as a factor that also affects the performance of a wave energy converter, for a set wave height and period. Therefore the relation between performance and several different parameters for spectral width was investigated. It was found that some of the parameters were in fact correlated to performance, but that the correlation was not very strong. As a background on ocean measurements in wave energy, a thorough literature review was conducted. It turns out that the Lysekil project is one of quite few projects that have published descriptions of on-site wave energy measurements.
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6

Shahroozi, Zahra. "Force Prediction and Estimation for Point Absorber Wave Energy Converter." Thesis, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-385353.

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Частини книг з теми "Point absorber technology"

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Hallak, T. S., D. Karmakar, and C. Guedes Soares. "Hydrodynamic performance of semi-submersible FOWT combined with point-absorber WECs." In Developments in Maritime Technology and Engineering, 577–85. London: CRC Press, 2021. http://dx.doi.org/10.1201/9781003216599-61.

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2

Calvário, M., and C. Guedes Soares. "Study of a composite pressure hull for point absorber wave energy converter." In Developments in Maritime Technology and Engineering, 639–45. London: CRC Press, 2021. http://dx.doi.org/10.1201/9781003216582-71.

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3

Hallak, T. S., M. Kamarlouei, J. F. Gaspar, and C. Guedes Soares. "Time domain analysis of a conical point-absorber moving around a hinge." In Trends in Maritime Technology and Engineering Volume 2, 401–9. London: CRC Press, 2022. http://dx.doi.org/10.1201/9781003320289-42.

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Hallak, T. S., J. F. Gaspar, M. Kamarlouei, and C. Guedes Soares. "Numerical and experimental analyses of a conical point-absorber moving around a hinge." In Developments in Maritime Technology and Engineering, 587–95. London: CRC Press, 2021. http://dx.doi.org/10.1201/9781003216599-62.

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5

Piscopo, V., and A. Scamardella. "AEP assessment of a new resonant point absorber deployed along the Portuguese coastline." In Trends in Maritime Technology and Engineering Volume 2, 451–59. London: CRC Press, 2022. http://dx.doi.org/10.1201/9781003320289-48.

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6

Valencia, J. B., and C. Guedes Soares. "A preliminary evaluation of the performance parameters of point absorbers for the extraction of wave energy." In Trends in Maritime Technology and Engineering Volume 2, 509–18. London: CRC Press, 2022. http://dx.doi.org/10.1201/9781003320289-53.

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7

Espindola, R., P. Andrade, and A. Araújo. "Theoretical analysis of mechanical energy conversion by a point absorber WEC using reanalysis wave data." In Maritime Technology and Engineering III, 1103–9. CRC Press, 2016. http://dx.doi.org/10.1201/b21890-148.

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8

Sinha, A., D. Karmakar, J. Gaspar, M. Calvário, and C. Soares. "Time domain analysis of circular array of heaving point absorbers." In Maritime Technology and Engineering III, 1133–40. CRC Press, 2016. http://dx.doi.org/10.1201/b21890-152.

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9

"Modelling pump efficiency in a generic hydraulic Power Take-Off for wave energy point absorbers." In Maritime Technology and Engineering, 1247–56. CRC Press, 2014. http://dx.doi.org/10.1201/b17494-134.

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Gaspar, J., and C. Soares. "Modelling pump efficiency in a generic hydraulic Power Take-Off for wave energy point absorbers." In Maritime Technology and Engineering, 1233–41. CRC Press, 2014. http://dx.doi.org/10.1201/b17494-167.

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Тези доповідей конференцій з теми "Point absorber technology"

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Sharma, Tushar, Anshu Ojha, and Nidhi Singh Pal. "Simulation of point absorber technology in Indian conditions." In 2017 IEEE International Conference on Power, Control, Signals and Instrumentation Engineering (ICPCSI). IEEE, 2017. http://dx.doi.org/10.1109/icpcsi.2017.8392201.

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2

Al Mahfazur Rahman, Abdullah, Md Moniruzzaman, and M. Al Mamun. "Estimation of energy potential of point absorber buoy type wave energy converter." In 2017 3rd International Conference on Electrical Information and Communication Technology (EICT). IEEE, 2017. http://dx.doi.org/10.1109/eict.2017.8275223.

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3

Pastor, Jeremiah, and Yucheng Liu. "Time Domain Modeling and Power Output for a Heaving Point Absorber Wave Energy Converter." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-36374.

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Анотація:
This paper presents, assesses, and optimizes a point absorber wave energy converter (WEC) through numerical modeling, simulation, and analysis in time domain. Wave energy conversion is a technology especially suited for assisting in power generation in the offshore oil and gas platforms. A linear frequency domain model is created to predict the behavior of the heaving point absorber WEC system. The hydrodynamic parameters are obtained with AQWA, a software package based on boundary element methods. A linear external damping coefficient is applied to enable power absorption and an external spring force is introduced to tune the point absorber to the incoming wave conditions. The external damping coefficient and external spring forces are the control parameters, which need to be optimized to maximize the power absorption. Two buoy shapes are tested and a variety of diameters and drafts are compared. Optimal shape, draft, and diameter of the model are then determined to maximize its power absorption capacity. Based on the results generated from the frequency domain analysis, a time domain analysis was also conducted to derive the responses of the WEC in the hydrodynamic time response domain. The time domain analysis results allowed us to estimate the power output of this WEC system.
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4

Zhao, Xilu, and Ichiro Hagiwara. "Designing and Manufacturing a Super Excellent and Ultra-Cheap Energy Absorber by Origami Engineering." In ASME 2019 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/detc2019-97725.

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Анотація:
Abstract Current vehicle energy absorbers have two defects during collision, such as only 70 % collapsed in its length and high initial peak load. It is because present energy absorbed column is the most primitive from the point of Origami structure. We developed the column so called Reversed Spiral Origami Structure; RSO which solves these 2 defects. However, for RSO, the manufacturing cost of hydroforming in the existing technology is too expensive to be applied in real vehicle structure. To address the problems, a new structure, named Reversed Torsion Origami Structure (RTO), has been developed, which can be manufactured at a low cost by using simple torsion. This structure is possible to replace conventional energy absorbers and it is expected to be widely used such as not only in automobile structures but also in building ones.
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Binh, Phan Cong. "A Study on Design and Simulation of the Point Absorber Wave Energy Converter Using Mechanical PTO." In 2018 4th International Conference on Green Technology and Sustainable Development (GTSD). IEEE, 2018. http://dx.doi.org/10.1109/gtsd.2018.8595546.

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Nava, Vincenzo, Marin Rajic, and Carlos Guedes Soares. "Effects of the Mooring Line Configuration on the Dynamics of a Point Absorber." In ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/omae2013-11141.

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The aim of this paper is to study the dynamics of a floating body with characteristics comparable to a point absorber wave energy converter with different mooring systems, in geometrical configuration or in the materials. To this purpose, the dynamics of a moored buoy is investigated. The point absorber is modeled as a spherical buoy in plane two-dimensional motion, and it is studied under the action of irregular unidirectional wind-generated waves, moored to the seabed by means of one, two or three mooring lines. Two different sets of moorings are considered, and typical wires and chains used in offshore technology are considered, leading to a total of 6 case studies. A quasi-static approach is used for modeling the restoring forces needed to keep buoy into station, using an innovative iterative procedure able to predict for each time instant and for each cable the lay down length of the cable, being each mooring line allowed to be taut or slack. Approaches in the time and frequency domains are used to obtain the system responses in intermediate waters, where these facilities are usually installed. Results for all case studies are compared both in terms of statistics of response and tensions on the top of the cable.
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Wirz, Men, Matthew Roesle, and Aldo Steinfeld. "Design Point for Predicting Year-Round Performance of Solar Parabolic Trough Concentrator Systems." In ASME 2013 7th International Conference on Energy Sustainability collocated with the ASME 2013 Heat Transfer Summer Conference and the ASME 2013 11th International Conference on Fuel Cell Science, Engineering and Technology. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/es2013-18055.

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Thermal efficiencies of the solar field of two different parabolic trough concentrator (PTC) systems are evaluated for a variety of operating conditions and geographical locations, using a detailed 3D heat transfer model. Results calculated at specific design points are compared to yearly average efficiencies determined using measured direct normal solar irradiance (DNI) data as well as an empirical correlation for DNI. It is shown that the most common choices of operating conditions at which solar field performance is evaluated, such as the equinox or the summer solstice, are inadequate for predicting the yearly average efficiency of the solar field. For a specific system and location, the different design point efficiencies vary significantly and differ by as much as 11.5% from the actual yearly average values. An alternative simple method is presented of determining a representative operating condition for solar fields through weighted averages of the incident solar radiation. For all tested PTC systems and locations, the efficiency of the solar field at the representative operating condition lies within 0.3% of the yearly average efficiency. Thus, with this procedure, it is possible to accurately predict year-round performance of PTC systems using a single design point, while saving computational effort. The importance of the design point is illustrated by an optimization study of the absorber tube diameter, where different choices of operating conditions result in different predicted optimum absorber diameters.
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Shimizu, Makoto, Kimio Takeuchi, Hitoshi Sai, Fumitada Iguchi, Noriko Sata, and Hiroo Yugami. "High-Temperature Solar Selective Absorber Material Using Surface Microcavity Structures." In ASME 2011 5th International Conference on Energy Sustainability. ASMEDC, 2011. http://dx.doi.org/10.1115/es2011-54599.

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The spectral properties of thermal radiation can be controlled by surface microstructures with feature size in the optical wavelength range. We applied this technology to solar selective absorbers for concentrated solar power (CSP) generation systems. We investigated the spectral properties and thermal stability of two-dimensional periodic microstructures on a tungsten (W) surface to develop solar selective absorbers for high-temperature applications. The developed absorbers exhibited good spectral selectivity and sufficient thermal stability under vacuum. Although we could verified that the microstructured solar selective absorbers improved CSP efficiency, this method cannot be put into practical use because of cost and time, and also because there is currently no technology for fabricating surface gratings on high melting point materials over a large area. Therefore, we used W–Cu alloys to investigate an approach to mass production of surface microcavity structures over a large area. We then confirmed that the absorptivity in the visible light range could be increased by using this simple method.
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Muliawan, Made Jaya, Madjid Karimirad, Torgeir Moan, and Zhen Gao. "STC (Spar-Torus Combination): A Combined Spar-Type Floating Wind Turbine and Large Point Absorber Floating Wave Energy Converter — Promising and Challenging." In ASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/omae2012-84272.

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This paper deals with a novel concept by combining a spar-type floating wind turbine (FWT) and a Torus (donutshaped) point absorber-type wave energy converter (WEC) that is referred as the ‘Spar-Torus Combination’ (STC) herein. Concept feasibility study has been carried out by doing numerical simulations. It showed that the STC results in a positive synergy between wind and wave energy generation in terms of both capital investment and power production. As a novel concept, the STC concept is considered a simple compact combination of two technologies that have had high technology readiness level (TRL). It is suitable for deep water deployment and is not sensitive to seabed conditions and wave directions. Therefore, it is interesting to pursue a further development of this concept. The paper presents the technical information about the STC and highlights some challenging areas of the STC that should be carefully looked at to make it a proven concept.
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Yang, Yang, Xilu Zhao, and Ichiro Hagiwara. "Energy Absorption Characteristics of Passenger Car With Origami Structure." In ASME 2021 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/detc2021-69870.

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Анотація:
Abstract In the crash collision, the vehicle energy absorbers play an important role in the energy absorbed performance. Current vehicle energy absorbers have two defects during collision, such as only 70 % collapsed in its length and high initial peak load. It is because present energy absorbed column is the most primitive from the point of Origami structure. We developed the column so called Reversed Spiral Origami Structure; RSO which solves these 2 defects. However, for RSO, the manufacturing cost of hydroforming in the existing technology is too expensive to be applied in real vehicle structure. To address the problems, we have developed a new molding method called “Partial-heating torsion molding method”. And we have developed RTO (Reversed Torsion Origami Structure) by this new molding method at a very low cost. We show this RTO also solves the two defects of the present vehicle absorbers by not only simulation but also experiments. This structure is possible to replace conventional energy absorbers and it is expected to be widely used such as not only in automobile structures but also in building ones.
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