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    Wyświetlanie 1-21 z 21
    Tytuł:
    Motion of water and sediment due to non-breaking waves in the swash zone
    Autorzy:
    Kapinski, J.
    Ostrowski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/48514.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    water motion
    sediment
    non-breaking wave
    flow velocity
    sediment transport
    spatial variability
    sandy shore
    swash zone
    Baltic Sea
    shear stress
    Opis:
    A long wave run-up theory is applied to the modelling of wave-induced flow velocities, sediment transport rates and bottom changes in a swash zone. First, the properties of the water tongue motion and the resulting lithodynamic response are analysed theoretically. Next, an attempt is made to run the model for the natural conditions encountered on the southern Baltic Sea coast. The Lagrangian swash velocities are used to determine the Eulerian phase-resolved bed shear stresses with a momentum integral method, after which the motion of sand is described by the use of a two-layer model, comprising bedload and nearbed suspended load. Seabed evolution is then found from the spatial variability of the net sediment transport rates. The results presented are limited to cases of the small-amplitude waves that seem to be responsible for accretion on beaches.
    Źródło:
    Oceanologia; 2012, 54, 2
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the geometry of ocean surface waves
    Autorzy:
    Massel, S.R.
    Powiązania:
    https://bibliotekanauki.pl/articles/48766.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    air-sea interaction
    atmosphere-ocean interaction
    deep water
    dynamic factor
    geometry
    irregular wave
    marine environment
    ocean surface
    regular wave
    shallow water
    surface wave
    water motion
    wave breaking
    wave slope
    Opis:
    The factors influencing the atmosphere-ocean transfer of mass and momentum, as well as incipient wave breaking and the amount of energy dissipated due to breaking, are discussed in detail. In particular, the influence of directional spreading on the statistics of surface wave slopes and the area of the wind- roughened ocean surface is demonstrated. Theoretical analysis and comparison with the available experimental data show that unimodal directional spreading is not able to reproduce the observed ratio of the cross-wind/up-wind mean square slopes. Better agreement is achieved when bimodal directional spreading, consisting of two wrapped-Gaussian distributions, is applied. The bimodal form suggested by Ewans (1998) is used in the paper. Moreover, the formulae developed here show that the increase in the area due to surface waves is rather small for both regular and irregular waves.
    Źródło:
    Oceanologia; 2011, 53, 2
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the generation of water waves in a flume
    Autorzy:
    Wilde, P.
    Wilde, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/241118.pdf
    Data publikacji:
    2001
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Tematy:
    water wave
    flume
    wavemaker
    horizontal motion
    piston
    Opis:
    The present paper proposes a simple model for the calculation of a time series to control the horizontal motion of the piston of a wavemaker. It is assumed that the initial conditions correspond to water at rest. It is assumed that parameters of kinematics of the fluid (displacement, velocity and acceleration fields) at the initial time are equal to zero. In the first interval the amplitudes grow to an asymptote that corresponds to a regular monochromatic wave. In the second interval the waves decay. Calculated time series were fed in to the control system of our wavemaker and the measured horizontal displacements of the piston compared. The control series was supplemented by terms corresponding to the Stokes type solution by addition of terms with multiples of the basic frequency.
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2001, 48, 4; 69-83
    1231-3726
    Pojawia się w:
    Archives of Hydro-Engineering and Environmental Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Energy-saving technologies with the use of water treated in magnetic fields
    Ehnergosberegajushhie tekhnologii s ispolzovaniem vody, obrabotannojj v magnitnykh poljakh
    Autorzy:
    Zhuravska, N.
    Malkin, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/791998.pdf
    Data publikacji:
    2016
    Wydawca:
    Komisja Motoryzacji i Energetyki Rolnictwa
    Tematy:
    water structure
    magnetic field
    magnetized water
    wave motion
    water processing
    energy saving
    Źródło:
    Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2016, 16, 4
    1641-7739
    Pojawia się w:
    Teka Komisji Motoryzacji i Energetyki Rolnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ship seakeeping in UKC determination – a further study on wave force transfer functions
    Autorzy:
    Artyszuk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/359064.pdf
    Data publikacji:
    2012
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    ship seakeeping
    ocean wave
    shallow water
    motion dynamics
    Opis:
    Modeling of ship motions in waves concentrates in most applications on the response amplitude operator (RAO). This mathematically not demanding method of analysis is very attractive, but loses some essential information in certain situations. The objective of present contribution is to establish and investigate preliminary foundations for a seakeeping model as optimal for under keel clearance (UKC) estimation. A special attention was devoted to transients of motions, stationary harmonic motions, coupling between degrees of freedom, and the wave force transfer functions – all in the aspect of shallow water environment.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2012, 32 (104) z. 2; 5-15
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the Description of Long Water Waves in Material Variables
    Autorzy:
    Szmidt, K.
    Hedzielski, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/241085.pdf
    Data publikacji:
    2009
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Tematy:
    long waves
    shallow water
    unsteady motion
    sloping beach
    Opis:
    Shallow water equations formulated in material variables are presented in this paper. In the model considered, a three-dimensional physical problem is substituted by a two-dimensional one describing a transformation of long waves in water of variable depth. The latter is obtained by means of the assumption that a vertical column of water particles remains vertical during the entire motion of the fluid. Under the assumption of small, continuous variation of the water depth, the equations for gravity waves are derived through Hamilton's principle formulated in terms of the material coordinates. This formulation ensures the conservation of mechanical energy. The approximation depends on the wave parameters as well as on the bed bathymetry. The latter may influence a solution of the model decisively; thus, one should be careful in applying the description to complicated geometries of fluid domains encountered in engineering practice.
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2009, 56, 1-2; 63-83
    1231-3726
    Pojawia się w:
    Archives of Hydro-Engineering and Environmental Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Analysis of Motion Dynamics and Resistance of the Multipurpose Boat Operating in Shallow Water
    Autorzy:
    Kulczyk, T.
    Górnicz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/116257.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Hydrodynamics
    Motion Dynamics
    Shallow Water
    Miltipurpose Boat
    Boat's Motion
    Computer Simulation
    CFD Method, Resistance
    Opis:
    Polish market of small boats has been developed very dynamically in recent years. Market competition forces the shipyards to build new more efficient hull forms and to cut the cost of production as well. This is why modern computer simulation programs are used more often by naval architects. Another trend is to design more universal ships that may be used by larger number of diversified customers. This paper presents project proposal of multipurpose boat hull form. The boat was design to fulfil the requirements imposed by public services like water police, fire brigades, and border guards. It is supposed to be operated on unexplored floodplains and other type shallow waters. The analysis of boat’s motion was based on computer simulations. The resistance curve was evaluated with two methods: comparison study of model test results of similar ships and CFD methods. The results obtained from Ansys Fluent and FINE/Marine systems were compared in this paper. It was shown that taking into consideration dynamic trim and sinkage has a significant impact on free surface capture and resistance values.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2014, 8, 3; 359-363
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Initial boundary value problems for vortex motion of an ideal fluid in bounded domains
    Autorzy:
    Szmidt, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/241010.pdf
    Data publikacji:
    2001
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Tematy:
    vortex motion
    incompressible perfect fluid
    bounded domains
    boundary value problems
    water wave
    Opis:
    The paper deals with the problem of vortex motion of an incompressible perfect fluid in bounded domains. The research is confined to chosen cases of steady velocity fields within rectangular, circular and elliptic regions with rigid boundaries. The solution to the initial-value problem of the fluid flow for the assumed velocity fields is the primary object of this paper. It is demonstrated that individual particles of the fluid have their own periods of motion and thus, one should be careful in describing such problems by means of discrete methods, especially in the Lagrangian variables. The problem discussed has its origin in numerical analysis of water waves by means of the finite difference or the finite element method.
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2001, 48, 1; 19-33
    1231-3726
    Pojawia się w:
    Archives of Hydro-Engineering and Environmental Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Life tests of a rotary single-stage magnetic-fluid seal for shipbuilding applications
    Autorzy:
    Matuszewski, L.
    Szydło, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/258558.pdf
    Data publikacji:
    2011
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    shaft sealing
    magnetic fluid
    utility water
    seal durability
    critical pressure
    critical motion velocity
    Opis:
    Use of the magnetic fluid seal technology in water is much more difficult technological problem in comparison to gas or vacuum environment. Some seals constructed up to time been are designed as hybrid, two stage sealing structures with shields or mechanical seals used as protection measures to the magnetic fluid seal. Anyway, there is always problem with immediate contact between magnetic fluid and the environmental liquid. In the paper are presented results of experiments carried out with one stage rotating magnetic fluid seal operating in immediate contact with utility water. The special test procedures have been elaborated and practically used, with the aim to define main characteristics of magnetic fluid seals and to simplify experiments. These characteristics were: critical pressure, critical motion velocity and working life of the seal. Four grades of commercial, silicon based magnetic fluids of hydrophobic properties were tested in a single stage sealing system. The results of tests are presented in the form of tables and diagrams. It is concluded that hydrophobic commercial magnetic fluids could be efficiently used in rotating shaft seals however in a limited range of motion velocity.
    Źródło:
    Polish Maritime Research; 2011, 2; 51-59
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multi-stage magnetic-fluid seals for operating in water – life test procedure, test stand and research results. Part. I. Life test procedure, test stand and instrumentation
    Autorzy:
    Matuszewski, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/260287.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    shaft sealing
    utility water
    seal durability
    critical pressure
    critical motion velocity
    magnetic fluid
    Opis:
    The edge criteria for magnetic-fluid seals durability research are critical for the seal’s technological usefulness. The magnetic fluid seal technology in water is much more difficult technological problem in comparison to gas or vacuum environment. There is always problem with immediate contact between magnetic fluid and the environmental uninspected liquids. In the paper are presented ways of experiments definitions carried out with multi-stage rotating magnetic fluid seal operating in permanent contact with utility water. The special test procedures have been elaborated and practically used, with the aim to define main characteristics of magnetic fluid seals. These characteristics were: critical pressure, critical motion velocity and working life of the seal. Some grades of commercial, silicon based magnetic fluids of hydrophobic properties were tested in sealing system. The test stand and its features as well as results of tests are presented in the form of tables, cross section draws and diagrams. In conclusion one can see that multi-stage magnetic-fluid seals could be efficiently used in water for rotating shaft seals in a limited range of motion velocity and work lasting.
    Źródło:
    Polish Maritime Research; 2012, 4; 62-70
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multi-stage magnetic-fluid seals for operating in water - life test procedure, test stand and research results. Part II Results of life tests of multi-stage magnetic - fluid seal operating in water
    Autorzy:
    Matuszewski, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/259203.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    shaft sealing
    magnetic fluid
    utility water
    seal durability
    critical pressure
    critical motion velocity
    Opis:
    The edge criteria for magnetic-fluid seals durability research were described in previous article [24] and now the tests results are presented. The tests were made with three magnetic fluids using various magnets quantity in magnetic assemblies. If values obtained in the repeated test deviated by more than 10 % from results of the first test an additional control test was made for final characteristics. The characteristics are: critical pressure, critical motion velocity and working life of the seal. The test stands were prepared for particular seals dimensions and results of tests are presented in the form of tables, cross section draws and diagrams. In conclusion one can see that multi-stage magnetic-fluid seals could be efficiently used in water for rotating shaft seals in a limited range of motion velocity and cycles quantity. Nevertheless a particular applications can be provided by magnetic-fluid seals only.
    Źródło:
    Polish Maritime Research; 2013, 1; 39-47
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wave-induced set-up and flow over shoals and coral reefs. Part 1. A simplified bottom geometry case
    Autorzy:
    Massel, S.R.
    Brinkman, R.M.
    Powiązania:
    https://bibliotekanauki.pl/articles/47564.pdf
    Data publikacji:
    2001
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    shoal
    hydrodynamics
    coral reef
    shallow
    biological variability
    wave motion
    morphology
    water depth
    linear function
    Opis:
    An analytical approach was used to model the wave-induced set-up and flow through simple shoal geometry when water depth is a linear function of the distance. Two different approaches were applied to parameterize the energy dissipation due to wave breaking. The resulting set-up height and flow velocity were determined and their dependence on the geometry of the shoal and offshore forcing was demonstrated. The extension of the solution to a more complicated bathymetry and verification against the experimental data will be given in the second part of the paper.
    Źródło:
    Oceanologia; 2001, 43, 4
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Methodology for measurement the energy efficiency involving solar heating systems using stochastic modelling
    Autorzy:
    Menita, B. G.
    Medeiros, G. P.
    Domingos, J. L.
    Domingues, E. G.
    Alves, A. J.
    Faria, A. F.
    Miguel, M. L. S.
    Calixto, W. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/136254.pdf
    Data publikacji:
    2017
    Wydawca:
    EEEIC International Barbara Leonowicz Szabłowska
    Tematy:
    energy efficiency
    geometric brownian motion
    Monte Carlo simulation
    performance measurement
    verification
    solar water heating
    Opis:
    The purpose of the present study is to evaluate gains through measurement and verification methodology adapted from the International Performance Measurement and Verification Protocol, from case studies involving Energy Efficiency Projects in the Goias State, Brazil. This paper also presents the stochastic modelling for the generation of future scenarios of electricity saving resulted by these Energy Efficiency Projects. The model is developed by using the Geometric Brownian Motion Stochastic Process with Mean Reversion associated with the Monte Carlo simulation technique. Results show that the electricity saved from the replacement of electric showers by solar water heating systems in homes of low-income families has great potential to bring financial benefits to such families, and that the reduction in peak demand obtained from this Energy Efficiency Action is advantageous to the Brazilian electrical system. Results contemplate also the future scenarios of electricity saving and a sensitivity analysis in order to verify how values of some parameters influence on the results, once there is no historical data available for obtaining these values.
    Źródło:
    Transactions on Environment and Electrical Engineering; 2017, 2, 1; 42-51
    2450-5730
    Pojawia się w:
    Transactions on Environment and Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Planned motion equations of free-running grain mixture flow
    Autorzy:
    Piven, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/791801.pdf
    Data publikacji:
    2016
    Wydawca:
    Komisja Motoryzacji i Energetyki Rolnictwa
    Tematy:
    shallow water
    free-running mixture
    stress tensor
    grain mixture
    vibrating sieve
    planned motion equation
    Źródło:
    Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2016, 16, 4
    1641-7739
    Pojawia się w:
    Teka Komisji Motoryzacji i Energetyki Rolnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Computation of energy for diapycnal mixing in the Baltic Sea due to internal wave drag acting on wind-driven barotropic currents
    Autorzy:
    Nohr, C.
    Gustafsson, B.G.
    Powiązania:
    https://bibliotekanauki.pl/articles/48609.pdf
    Data publikacji:
    2009
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    Baltic Sea
    North Sea
    barotropic motion
    computation
    deep water
    halocline
    internal wave
    saline water
    sea level
    seasonal thermocline
    shallow water
    stratification
    surface area
    turbulent mixing
    water exchange
    wind force
    Opis:
    The pathways of energy supply for mixing the deep waters of the Baltic Sea is largely unknown. In this paper, a parameterization of the internal wave drag forces on barotropic motion is developed and implemented into a two-dimensional shallow water model of the Baltic Sea. The model is validated against observed sea levels. The dissipation of barotropic motion by internal wave drag that is quantified from the model results show that breaking internal waves generated by wind forced barotropic motions can contribute significantly to diapycnal mixing in the deep water of the Baltic Sea.
    Źródło:
    Oceanologia; 2009, 51, 4
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Twórczość Gianlorenzo Berniniego – specyfika rzymskich fontann barokowego mistrza
    Gianlorenzo Bernini’s Works – Specification of Roman Fountains made by the Baroque Artist
    Autorzy:
    Liwoch, Beata
    Powiązania:
    https://bibliotekanauki.pl/articles/460267.pdf
    Data publikacji:
    2014
    Wydawca:
    Fundacja Pro Scientia Publica
    Tematy:
    Bernini
    fontanna
    Rzym
    barok
    woda
    przeciwieństwo
    nieskończoność
    ruch
    fountain
    Rome
    baroque
    water
    contrast
    inflnity
    motion
    Opis:
    Rzymskie fontanny Gianlorenzo Berniniego są znakomitym przykładem dzieł sztuki okresu pełnego baroku. Na podstawie ich hermeneutycznej analizy dowodzę, że woda zawiera w sobie cechy, które są kluczowe dla stylu barokowego. W artykule omawiam sylwetkę Gianlorenzo Berniniego, historię zaprojektowanych przez niego fontann, a także cechy, które pozwalają mi utożsamić wykorzystaną w dziele sztuki wodę z istotą baroku: zestawienie natury i kultury, ideę nieskończoności oraz ruch.
    Gianlorenzo Bernini’s fountains in Rome are tremendous examples of late baroque works of art. In this article I am going to prove that water incorporates characteristics of the late baroque, on the basis of hermeneutic analysis. Firstly, the article presents Bernini as an artist. Further on, a brief story of his fountains is introduced, and finally the characteristics which enabled me to connect the idea of water with the essence of baroque, a juxtaposition of nature and culture, the idea of infinity and motion, are explored.
    Źródło:
    Ogrody Nauk i Sztuk; 2014, 4; 557-565
    2084-1426
    Pojawia się w:
    Ogrody Nauk i Sztuk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study on Manoeuvring Criteria for Safety Assessment in Shallow Water
    Autorzy:
    Nakamura, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/116979.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    shallow water
    ships manoeuvering
    safety assessment
    manoeuvring criteria
    navigational safety assessment
    mathematical models
    navigational simulation
    measurement of motion conditions
    Opis:
    The necessity of verifying manoeuvring mathematical models in shallow water for studying the safety of ships using a ship-handling simulator is pointed out in this report. Several instances of verification of mathematical models in shallow water are introduced here based on measurements of motion conditions of full-scale ships and shallow water tank tests of models. Results of safety assessment tests of five manoeuvring phases are given using the verified manoeuvring mathematical models to discuss manoeuvring criteria in shallow water. Objective manoeuvring criteria for safety assessment in shallow water are proposed based on subjective judgement related to control margin assessed by more than 3,200 masters and pilots for over 325 simulation tests and by analysis of the study results of 15 full-scale ships.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2017, 11, 3; 401-407
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Shallow-water wave energy dissipation in a multi-bar coastal zone
    Autorzy:
    Pruszak, Z.
    Szmytkiewicz, P.
    Ostrowski, R.
    Skaja, M.
    Szmytkiewicz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/47959.pdf
    Data publikacji:
    2008
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    coastal region
    energy dissipation
    surf zone
    Baltic Sea
    wave parameter
    wave motion
    wave transformation
    shallow water
    coastal zone
    offshore wave
    Opis:
    The paper presents the results of studies of wave transformation on a multi-bar cross-shore profile of the southern Baltic Sea. The field investigations of wave motion were carried out using an offshore wave buoy and string wave gauges at the IBW PAN Coastal Research Station, Lubiatowo (Poland). These experimental results were used to validate statistical relationships between characteristic wave parameters in the coastal region and to assess wave energy dissipation in the surf zone. Asimple model for calculating the residual nearshore wave energy is proposed and tested versus the data collected in situ.
    Źródło:
    Oceanologia; 2008, 50, 1; 43-58
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical study of hydrodynamic derivatives and course stability under ship-bank interaction
    Autorzy:
    Liu, H.
    Ma, N.
    Gu, X. C.
    Powiązania:
    https://bibliotekanauki.pl/articles/116925.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    safety at sea
    ship-bank interaction
    Reynolds-Averaged Navier-Stokes (RANS)
    hydrodynamic derivatives
    hydrodynamics
    Planar Motion Mechanism (PMM)
    Circulating Water Channel (CWC)
    User Defined Functions (UDF)
    Opis:
    Since ship-bank interaction affects the manoeuvrability of a ship navigating close to a bank, the determination of hydrodynamic derivatives is of great importance to assess the ship manoeuvrability. To obtain the hydrodynamic derivatives of the KVLCC2 model ship with different water depths and ship-bank distances, the simulation of PMM tests are carried out using an unsteady Reynolds-Averaged Navier–Stokes (RANS) based solver. Hybrid dynamic mesh technique is proposed to realize the simulation of pure yaw tests in confined water. Studies on the grid convergence and time-step-size convergence are firstly performed. Hydrodynamic derivatives for the ship in different water depths and ship-bank distances are compared. The course stability is investigated based on time-domain simulations and eigenvalue analysis, and the results show that the ship-bank interaction and shallow water effect have a remarkable influence on the course stability.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2018, 12, 4; 747-753
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of energy resources of Polish Baltic Sea areas
    Ocena zasobów energetycznych polskich obszarów Morza Bałtyckiego
    Autorzy:
    Kałas, M.
    Piotrowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/111479.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Morski w Gdańsku
    Tematy:
    renewable energy resources
    wind
    wave motion
    water flows
    polish marine areas of the Baltic Sea
    zasoby energii odnawialnej
    wiatr
    falowanie
    przepływy wody
    polskie obszary morskie na Bałtyku
    Opis:
    The article presents spatial characteristics of energy fluxes recorded in the area of the Polish Exclusive Economic Zone (EEZ) in the four-year period of 2013–16. Data presented in this work are based on results of forecast calculations with application of numerical models of the atmosphere (HIRLAM) and sea (WAM and HIROMB). Conducted analyses were concerned with dynamics of physical phenomena above the sea surface (wind), on its surface (wind waves motion), and in its near-surface layer up to 4 m (seawater flows). Physical energy resources connected with these processes for subsequent four years were computed and compared with the amount of annual electricity output generated by conventional and renewable sources of energy. Such an analysis of estimated energy resources reveals that the resource are highly differentiated in terms of space and in individual years, and significantly exceed the annual production of Polish power plants.
    Praca przedstawia charakterystykę rozkładów przestrzennych strumieni energii, jakie w latach 2013–16 związane były z obszarem polskiej strefy odpowiedzialności na Bałtyku (EEZ). Przedstawione dane uzyskano korzystając z wyników obliczeń prognostycznych operacyjnych modeli numerycznych: atmosfery (HIRLAM) oraz morza (WAM i HIROMB). Wykonane analizy dotyczyły dynamiki zjawisk fizycznych nad powierzchnią morza - wiatru, na jego powierzchni - falowania wiatrowego oraz w jego przypowierzchniowej warstwie (do 4 m) – przepływów wody. Oszacowano fizyczne zasoby energii związane z wymienionymi procesami dla czterech kolejnych lat i porównano je z wielkościami rocznej produkcji energii elektrycznej ze źródeł konwencjonalnych i odnawialnych. Analiza tak otrzymanych wielkości pokazuje, że zasoby energii są znacząco zróżnicowane przestrzennie jak i w poszczególnych latach i znacząco przewyższają możliwości produkcyjne polskich elektrowni.
    Źródło:
    Biuletyn Instytutu Morskiego w Gdańsku; 2017, 32, 1; 93-105
    1230-7424
    2450-5536
    Pojawia się w:
    Biuletyn Instytutu Morskiego w Gdańsku
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Shaft Bearing of Wind Turbine with Vertical Axis of Rotation
    Łożyskowanie wału siłowni wiatrowej o pionowej osi obrotu
    Autorzy:
    Grzegorzek, Wojciech
    Adamecki, Daniel
    Mikuła, Jarosław
    Borek, Wojciech
    Głuszek, Grzegorz
    Mikuła, Stanisław
    Powiązania:
    https://bibliotekanauki.pl/articles/2116058.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    green energy
    low resistance to motion
    prosumer wind turbine
    quiet running
    long service life
    renewable energy sources
    RES
    water-lubricated hybrid bearing
    zielona energia
    OZE
    prosumencka elektrownia wiatrowa
    niskie opory ruchu
    łożysko hybrydowe smarowane wodą
    cichobieżność
    wysoka trwałość
    Opis:
    This article describes a new design solution for a hybrid bearing intended for use in prosumer wind turbines with a vertical axis of rotation of the turbine rotor. The automatic rotational speed-dependent load-switching, lubrication and cooling systems applied in the hybrid bearing ensure a particularly long service life and highly quiet running while maintaining high energy efficiency over the full rotational speed range of shafts with turbine rotors. The hybrid bearing design has been adapted to the use of lubricating fluids with the lowest possible viscosity, including oil-water emulsions and even water itself. The use of water as a lubricant makes the bearing system highly environmentally friendly and completely fire-safe.
    W artykule opisano nowe rozwiązanie konstrukcyjne łożyska hybrydowego przeznaczonego do zastosowania w prosumenckich siłowniach wiatrowych o pionowej osi obrotu wirnika turbinowego. Zastosowane w łożysku hybrydowym układy automatycznego przełączania obciążenia w zależności od prędkości obrotowej, smarowania i chłodzenia zapewniają uzyskanie szczególnie długiej trwałości i dużej cichobieżności przy zachowaniu wysokiej sprawności energetycznej w pełnym zakresie prędkości wirowania wałów z wirnikami turbinowymi. Konstrukcja łożyska hybrydowego przystosowana została do wykorzystania cieczy smarnych o możliwie niskiej lepkości, w tym emulsji olejowo-wodnych, a nawet samej wody. Wykorzystanie wody jako środka smarnego powoduje, że łożyskowanie ma wysokie walory ekologiczne i całkowite bezpieczeństwo pożarów
    Źródło:
    Tribologia; 2022, 1; 9--17
    0208-7774
    Pojawia się w:
    Tribologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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