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1
Content available A triboelectric nanogenerator based on a pendulum-plate wave energy converter
Zhu Shenglin, Yang Shaohui, Li Hui, Huang Yan, Du Zhichang, Fan Jianyu, Lin Zhonghua
Polish Maritime Research
|
2022
|
nr 4
155--161
2
Zastosowanie bioniki w projektowaniu elektrowni morskich
Przybyła K.
Gospodarka Wodna
|
2018
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Nr 10
304--307
PL
W artykule przedstawiono analizę zysków oraz zagrożeń wynikających z funkcjonowania elektrowni morskich. Analizowane przypadki dotyczą elektrowni morskich pobierających energię z ruchu fal, pływów oraz prądów morskich. Aby pokazać różnokierunkowe możliwości dla rozwoju podwodnej energetyki, uwzględniono szeroki zakres typologii analizowanych urządzeń, a także wpływ elektrowni na środowisko wodne. Stosowane obecnie elektrownie zestawiono z rozwiązaniami nietypowymi, bazującymi na technologiach bionicznych. Ma to na celu zaprezentowanie możliwych rozwiązań zwiększających wydajność i poprawę warunków funkcjonowania elektrowni morskich.
EN
The article presents an analysis of benefits and threats resulting from the marine power plants functioning. Subject to the analysis were marine stations generating power from waves, tides and sea currents. In order to show multi-directional possibilities for the underwater power industry development, it took into account a wide typology of the analysed equipment, as well as the impact of the plants on the marine environment. The currently functioning power plants are compared to some uncommon solutions based on bionic technologies. The goal is to present the possible solutions increasing the performance and improving the conditions of the marine power plants functioning.
3
Content available Dynamic characteristics of magnetic coupling in horizontal axis wave energy device
Zhang J., Liu Y., Liu J., He T., Xie Y.
Polish Maritime Research
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2017
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S 3
165--170
EN
To solve the dynamic response problems of magnetic coupling in the horizontal axis wave energy device, this has researched the dynamic characteristicsof magnetic coupling. The fitting formula about torque and angle of the magnetic coupling is obtained through experiments. The mathematical models of the magnetic coupling torque transmission are established. The steady state error of the magnetic coupling and the transfer function of the output angle are obtained. The analytical solution of the step response of the output angle in time domain is derived. The influence of the torsional rigidity, the damping coefficient and the driven rotor’s rotational inertia on dynamic characteristics of the magnetic coupling isanalyzed. According to the analysis results, the design rules of magnetic coupling are proposed.
4
Content available Utilising water wave energy – technology profile
Chybowski L., Kuźniewski B.
Zeszyty Naukowe Akademii Morskiej w Szczecinie
|
2016
|
nr 47 (119)
183--186
EN
The use of wave energy was studied at the Maritime University of Szczecin. The two main subjects were wave-energy conversion and using wave energy to protect the seashore against the hazardous effects of extreme waves. A construction of new technologies were outlined. Future research and intended cooperation were presented.
5
Content available Semi-analytical solution of optimization on moon-pool shaped WEC
Zhang W. C., Liu H. X., Zhang X. W., Zhang L.
Polish Maritime Research
|
2016
|
S 1
25--31
EN
In order to effectively extract and maximize the energy from ocean waves, a new kind of oscillating-body WEC (wave energy converter) with moon pool has been put forward. The main emphasis in this paper is placed on inserting the damping into the equation of heaving motion applied for a complex wave energy converter and expressions for velocity potential added mass, damping coefficients associated with exciting forces were derived by using eigenfunction expansion matching method. By using surface-wave hydrodynamics, the exact theoretical conditions were solved to allow the maximum energy to be absorbed from regular waves. To optimize the ability of the wave energy conversion, oscillating system models under different radius-ratios are calculated and comparatively analyzed. Numerical calculations indicated that the capture width reaches the maximum in the vicinity of the natural frequency and the new kind of oscillating-body WEC has a positive ability of wave energy conversion.
6
Content available Optimal configurations of wave energy converter arrays with a floating body
Zhang W., Liu H., Zhang X., Zhang L., Ashraf M. A.
Polish Maritime Research
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2016
|
S 1
71--77
EN
An array of floating point-absorbing wave energy converters (WECs) is usually employed for extracting efficiently ocean wave energy. For deep water environment, it is more feasible and convenient to connect the absorbers array with a floating body, such as a semi-submersible bottom-moored disk, whose function is to act as the virtual seabed. In the present work, an array of identical floating symmetrically distributed cylinders in a coaxial moored disk as a wave energy device is proposed The power take-off (PTO) system in the wave energy device is assumed to be composed of a linear/nonlinear damper activated by the buoys heaving motion. Hydrodynamic analysis of the examined floating system is implemented in frequency domain. Hydrodynamic interferences between the oscillating bodies are accounted for in the corresponding coupled equations. The array layouts under the constraint of the disk, incidence wave directions, separating distance between the absorbers and the PTO damping are considered to optimize this kind of WECs. Numerical results with regular waves are presented and discussed for the axisymmetric system utilizing heave mode with these interaction factors, in terms of a specific numbers of cylinders and expected power production.
7
Content available Energy retrieval from sea waves
Szelangiewicz T., Żelazny K.
Zeszyty Naukowe Akademii Morskiej w Szczecinie
|
2015
|
nr 41 (113)
30--34
EN
Seas and oceans occupy approx. 71% of the Earth. On their surface wave action of stronger or weaker magnitude can be observed throughout a major part of the year. Wind-generated wave action contains energy, which can be retrieved and used for electrical current production. The paper shows what energy is contained in wind-generated waves on various ocean areas, presents dynamics of water movement in a wave as well as several examples of calculation results of the velocity of water particles and hydrodynamic pressures occurring in a wave.
8
Content available Establishment of motion model for wave capture buoy and research on hydrodynamic performance of floating-type wave energy converter
Gao H., Li B.
Polish Maritime Research
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2015
|
S 1
106--111
EN
Floating-type wave energy converter has the advantages of high wave energy conversion efficiency, strong shock resistance ability in rough sea and stable output power. So it is regarded as a promising energy utilization facility. The research on hydrodynamic performance of wave capture buoys is the precondition and key to the wave energy device design and optimization. A simplified motion model of the buoys in the waves is established. Based on linear wave theory, the equations of motion of buoys are derived according to Newton’s second law. The factors of wave and buoys structural parameters on wave energy absorption efficiency are discussed in the China’s Bohai Sea with short wave period and small wave height. The results show that the main factor which affects the dynamic responses of wave capture buoys is the proximity of the natural frequency of buoys to the wave period. And the incoming wave power takes a backseat role to it at constant wave height. The buoys structural parameters such as length, radius and immersed depth, influence the wave energy absorption efficiency, which play significant factors in device design. The effectiveness of this model is validated by the sea tests with small-sized wave energy devices. The establishment methods of motion model and analysis results are expected to be helpful for designing and manufacturing of floating-type wave energy converter.
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