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    Wyświetlanie 1-11 z 11
    Tytuł:
    Determination of optimum hull form for passenger car ferry with regard to its sea-keeping qualities and additional resistance in waves
    Autorzy:
    Cepowski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/258898.pdf
    Data publikacji:
    2008
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    sea-keeping qualities
    roll-on/roll-off ferry ship
    rolling
    transverse accelerations
    vertical accelerations
    motion sickness index
    additional resistance in waves
    ship hull form
    ship design parameters
    artificial neural networks
    fuzzy logic
    Opis:
    This paper presents a method which makes it possible to determine optimum hull form of passenger car ferry with regard to selected sea-keeping qualities and additional resistance in waves. In the first phase of investigations a hull form characterized by the highest qualities was selected from the list of similar ships. Next, its optimum dimension ratios were determined. Design criteria were formulated by using a method based on deterministic scenarios, but objective functions of partial targets were determined in the form of artificial neural networks. To select the best design variants elements of fuzzy logic were used, that made it possible a.o. to show merits of the design by means of linguistic variables. Such approach made it possible to find the best hull form and its dimensions from the point of view of all considered criteria simultaneously.
    Źródło:
    Polish Maritime Research; 2008, 2; 3-11
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence analysis of changes of design parameters of passenger-car ferries on their selected sea-keeping qualities
    Autorzy:
    Cepowski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/259447.pdf
    Data publikacji:
    2010
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    passenger-car ferry
    design guidelines
    preliminary design stage
    sea-keeping qualities
    rolling
    sea-sickness (motion-sickness) index
    vertical accelerations
    ateral accelerations
    ship main dimensions
    Opis:
    The main scientific aim of this research was to elaborate design guidelines which could make it possible to improve sea-keeping qualities of passenger-car ferries. The searchedfor design guidelines were prepared in the form of regression functions as well as artificial neural networks on the basis of the results obtained from calculations with the use of numerical methods based on the theory of planar flow around a body. The guidelines make it possible to predict ship roll, sea-sickness index, lateral and vertical accelerations on the basis of quantities available in the preliminary stage of ship design.
    Źródło:
    Polish Maritime Research; 2010, 1; 25-32
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prediction of the influence of propeller emergence on its thrust reduction during ship navigation on waves
    Prognozowanie wpływu wynurzania się śruby napędowej na spadek naporu podczas pływania statku na fali
    Autorzy:
    Szelangiewicz, T.
    Żelazny, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/359277.pdf
    Data publikacji:
    2010
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    kołysania statku na fali
    pionowy ruch względny
    ship motions on waves
    vertical relative motion
    Opis:
    During ship's navigation on waves some relative motions occur resulting in propeller emergence, which in consequence reduces the propeller thrust. The article presents an algorithm for calculating the propeller thrust reduction as a result of ship motions on waves. The algorithm has preset parameters: significant wave height Hs, period T1 and geographical direction.
    Podczas pływania statku na fali powstają m.in. ruchy względne, które powodują wynurzanie się śruby napędowej, a w konsekwencji spadek naporu. W artykule przedstawiono algorytm obliczania spadku naporu śruby w wyniku kołysań statku na fali o zadanych parametrach: wysokość znacząca Hs, okres T1 i kierunek geograficzny.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2010, 21 (93); 83-87
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The propeller thrust and speed reduction as a result of the propeller emergence on a given ocean route
    Spadek naporu i prędkości statku w wyniku wynurzania się śruby napędowej na danej linii żeglugowej
    Autorzy:
    Szelangiewicz, T.
    Żelazny, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/360413.pdf
    Data publikacji:
    2010
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    kołysania statku na fali
    pionowy ruch względny
    ship motions on waves
    vertical relative motion
    Opis:
    During ship navigation on waves its relative motions occur which result in propeller emergence. This, in consequence, causes the propeller thrust drop. The article presents the results of calculations of the propeller thrust drop and ship service speed reduction on a preset ocean route where specific mean statistic weather parameters occur.
    Podczas pływania statku na fali powstają m.in. ruchy względne, które powodują wynurzanie się śruby napędowej, a w konsekwencji spadek naporu. W artykule przedstawiono algorytm obliczania spadku naporu śruby w wyniku kołysań statku na fali o zadanych parametrach: wysokość znacząca Hs, okres T1 i kierunek geograficzny
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2010, 22 (94); 63-66
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Adequate Theory of Vertical Motion of a Mass-Elastic System
    Autorzy:
    Pluta, Z.
    Hryniewicz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/412071.pdf
    Data publikacji:
    2013
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Theory of oscillation motion
    Vertical mass-elastic system
    Free harmonic oscillator motion
    potential field
    force characteristics
    Source equation of path/way length
    time constant
    Opis:
    The paper covers an adequate theory on vertical motion of the mass-elastic system. This system is an oscillator with the motion being a free harmonic motion. The first extended link of the consideration presents a critical analysis of the existent knowledge referred to this subject. Then the energetic states of the oscillator have been determined. Next the force characteristics of the free harmonic motion of the oscillator are presented. A general source equation of the path/way length and the resulting detailed forms, signalizing extensive possibilities to build up the characteristics, have been presented. Finally the connections between the characteristics of real and simulative motions were derived. It should be added that this first mentioned motion is the subject of adequate description presented here. The simulated motion is referred to the existent classical theory which has been subjected under a critical consideration.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2013, 6; 116-136
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of the propeller emergence on the torque during sailing of a ship on a regular wave
    Autorzy:
    Szelangiewicz, T.
    Żelazny, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/359675.pdf
    Data publikacji:
    2013
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    ship motion on a regular wave
    vertical relative motion
    propeller emergence
    decrease in torque value of a propeller
    Opis:
    While the ship is sailing on waves the relative motions occur which result in propeller emergence, and as a consequence – propeller thrust reduction which results in a decrease in the ship’s speed. Propeller emergence is also accompanied by the decrease in torque values, with which the propeller affects the propelling engine. The article presents both calculation results and the algorithm for calculating the decrease in torque of the propeller during ship motion on a regular wave.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2013, 35 (107); 138-143
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of ship size and propeller parameters on engine workload during ship motion on regular wave
    Autorzy:
    Żelazny, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/135633.pdf
    Data publikacji:
    2015
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    ship motions on a regular wave
    vertical relative motion
    propeller emergence
    decrease in torque value of a propeller
    Opis:
    While the ship is sailing on waves the relative motions occur which result in propeller emergence, and as a consequence – propeller thrust reduction which results in a decrease in the ship’s speed. Propeller emergence is also accompanied by the decrease in torque values, with which the propeller affects the marine engine. The article presents a simplified method for calculating the decrease in torque of the propeller during ship motion on a regular wave together with the obtained results for various ship sizes and propellers.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2015, 41 (113); 52-57
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Lexicalisation of vertical motion: A study of three satellite-framed languages
    Autorzy:
    Łozińska, Joanna
    Pietrewicz, Barbara
    Powiązania:
    https://bibliotekanauki.pl/articles/677239.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Instytut Slawistyki PAN
    Tematy:
    vertical motion
    motion event
    satellite-framed languages
    lexicalization patterns
    Polish
    Russian
    English
    Opis:
    Lexicalisation of vertical motion: A study of three satellite-framed languagesThis article presents a comparison of the description of motion in three satellite-framed languages, namely in Polish, Russian and English. More specifically, the lexicalisation patterns of horizontal and vertical motion are compared on the basis of elicitation data. The study highlights the divergent patterns of the lexicalisation of motion along these two planes in the three languages. Besides a description of the motion verbs coding these relations, the linguistic and non-linguistic factors influencing the lexicalisation patterns of motion are discussed. Leksykalizacja ruchu wertykalnego w polskim, rosyjskim i angielskimArtykuł przedstawia porównanie sposobów leksykalizacji ruchu w trzech językach z tzw. „ramą towarzyszącą" - w języku polskim, rosyjskim oraz angielskim. Na podstawie danych uzyskanych od respondentów porównane zostały wzory leksykalizacji ruchu horyzontalnego i wertykalnego w tych trzech językach. Wyniki wskazują na różne wzorce leksykalizacji ruchu horyzontalnego i wertykalnego. W artykule omówiono czynniki zarówno językowe jak i niejęzykowe wpływające na wzorce leksykalizacji ruchu wertykalnego.
    Źródło:
    Cognitive Studies; 2018, 18
    2392-2397
    Pojawia się w:
    Cognitive Studies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Forced motion CFD simulation and load refinement evaluation of floating vertical-axis tidal current turbines
    Autorzy:
    Zhang, Wanchao
    Zhou, Yujie
    Wang, Kai
    Zhou, Xiaoguo
    Powiązania:
    https://bibliotekanauki.pl/articles/1573876.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    vertical-axis tidal current turbine
    hydrodynamic loads
    pitching motion
    added mass
    damping coefficients
    Opis:
    Simulation of the hydrodynamic performance of a floating current turbine in a combined wave and flow environment is important. In this paper, ANSYS-CFX software is used to analyse the hydrodynamic performance of a vertical-axis turbine with various influence factors such as tip speed ratio, pitching frequency and amplitude. Time-varying curves for thrust and lateral forces are fitted with the least squares method; the added mass and damping coefficients are refined to analyse the influence of the former factors. The simulation results demonstrate that, compared with nonpitching and rotating turbines under constant inflow, the time-varying load of rotating turbines with pitching exhibits an additional fluctuation. The pitching motion of the turbine has a positive effect on the power output. The fluctuation amplitudes of thrust and lateral force envelope curves have a positive correlation with the frequency and amplitude of the pitching motion and tip speed ratio, which is harmful to the turbine’s structural strength. The mean values of the forces are slightly affected by pitching frequencies and amplitudes, but positively proportional to the tip speed ratio of the turbine. Based upon the least squares method, the thrust and lateral force coefficients can be divided into three components, uniform load coefficient, added mass and damping coefficients, the middle one being significantly smaller than the other two. Damping force plays a more important role in the fluctuation of loads induced by pitching motion. These results can facilitate study of the motion response of floating vertical-axis tidal current turbine systems in waves.
    Źródło:
    Polish Maritime Research; 2020, 3; 40-49
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mathematical modeling of convective heat and mass transfer of a rotating nano-fluid bounded by stretching and stationary walls in a vertical conduit
    Autorzy:
    Haritha, B.
    Umadevi, C.
    Dhange, M. Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/1839699.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    pole magnetyczne
    termoforeza
    ruchy Browna
    Brownian motion
    magnetic field
    stretching wall
    vertical conduit
    thermophoresis
    Opis:
    The influence of thermal emission and unvarying magnetic field of convective heat and mass transfer of a rotating nano-liquid in an upright conduit constrained by a stretching and motionless wall is studied. The temperature, concentration profile, primary and secondary velocities have been computed through similarity transformation and fourth-order Runge-Kutta shooting technique. The objective of this article is to measure the impact of emission constraint, Brownian movement constraint and Eckert number, thermophoresis constraint, Prandtl number, space, and temperature-dependent heat source constraint on velocity. The results are presented in tables and graphs. Further, various constraint impacts on the skin friction coefficient, heat and mass transfer rates are also explored. This work is pertinent to biotechnological and engineering uses, like mass and heat transfer enhancement of microfluids and design of bioconjugates.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2020, 25, 4; 69-83
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of vertical ground motion on seismic responses of triple friction pendulum interlayer isolation structures
    Autorzy:
    Fang, Zhao
    Yan, Ping
    Powiązania:
    https://bibliotekanauki.pl/articles/1852324.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ruch gruntu pionowy
    struktura
    izolacja międzywarstwowa
    odpowiedź sejsmiczna
    wahadło z potrójnym tarciem
    vertical ground motion
    interlayer isolation
    structure
    seismic response
    triple friction pendulum
    Opis:
    In order to investigate the influence of vertical ground motion on seismic responses of story-isolation structures mounted on triple friction pendulum (TFP) bearings, the finite element model of a six-story building with various types of interlayer isolation TFP bearings under far field or near fault ground motions is established and analysed. A discrepancy rate function of peak interlayer shear, acceleration and displacement results is adopted to discuss the influence of the vertical seismic motions on isolation structural responses. Furthermore, the isolation form, the isolation period and the friction coefficient of bearings are changed to study their effect on the vertical seismic component’s influence. The results show that the influence of the vertical seismic component is considerable on the isolation layer especially under near-fault ground motions, so it should not be overlooked during the structural design; The change of isolation forms will greatly affect the influence of the vertical seismic component especially in the isolation layer and isolation systems with isolation devices set on higher stories or with less isolation layers will have less vertical seismic effect on story acceleration; The increase of the isolation period will globally result in the decrease of the influence of vertical seismic components, though in some cases it shows some sort of fluctuation before the final decrease; The increase of the friction coefficient will lead to the global decrease in the influence of the vertical seismic component in single-layer isolation structures, while it does not obviously affect those in the multi-layer isolation systems.
    Źródło:
    Archives of Civil Engineering; 2021, 67, 3; 581-597
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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