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    Wyświetlanie 1-6 z 6
    Tytuł:
    Historia i trendy rozwojowe wykorzystania hydrofoli w konstrukcji jachtów żaglowych
    Hydrofoils in construction of sailing yachts
    Autorzy:
    Ginter, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/315435.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Naukowo-Wydawniczy "SPATIUM"
    Tematy:
    żeglarstwo
    jacht żaglowy
    stateczność jachtu
    hydroskrzydła
    sailing
    sailing yacht
    stability of yacht
    hydrofoils
    Opis:
    W artykule omówiono zastosowanie hydroskrzydeł w konstrukcjach jachtów. Zwrócono uwagę na historię rozwoju podwodnych skrzydeł zarówno w jednostkach napędzanych silnikami jak i wiatrem ze szczególnym wskazaniem problemów technicznych. Opisano główne trendy i kierunki rozwoju jednostek żaglowych, wyposażonych w systemy skrzydeł.
    In the paper the usage of hydrofoils in sailing yachts is discussed. The paper draws attention to the history of development of hydrofoils both in engine and wind driven vessels, focusing specifically on technical issues. Major trends and directions of development of sailing yachts equipped with systems of hydrofoils are described.
    Źródło:
    Autobusy : technika, eksploatacja, systemy transportowe; 2018, 19, 6; 426-430, CD
    1509-5878
    2450-7725
    Pojawia się w:
    Autobusy : technika, eksploatacja, systemy transportowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical prediction of steady and unsteady tip vortex cavitation on hydrofoils
    Autorzy:
    Flaszyński, P.
    Szantyr, J. A.
    Tesch, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/259131.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    rotary hydraulic machinery
    vortex cavitation
    numerical methods
    Opis:
    The article presents the numerical method for prediction of tip vortex cavitation generated on hydrofoils. This method has been developed in the course of numerical and experimental research described in earlier publications. The objective of the research was to design the optimum discrete grid structure for this specific computational task and to select the best turbulence model for such an application The article includes a short description of the method and a computational example demonstrating its performance. In this example the results of numerical prediction of the cavitating tip vortex obtained from two commercial CFD codes are compared with experimental photographs taken in the cavitation tunnel in the corresponding flow conditions. Altogether nine different flow conditions are tested and analyzed, but only selected results are included. The accuracy of the numerical predictions is discussed and the reasons for minor existing discrepancies are identified. The unsteady tip vortex calculations are also presented, showing the fluctuations of the transverse velocity components predicted for three cross-sections of the cavitating vortex kernel.
    Źródło:
    Polish Maritime Research; 2012, 3; 3-15
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High-speed catamaran’s longitudinal motion attenuation with active hydrofoils
    Autorzy:
    Hu, K.
    Ding, Y.
    Wang, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/259910.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    High-speed catamaran
    longitudinal motion attenuation
    2.5D theory
    hydrofoil
    Opis:
    This paper mainly studies the longitudinal motion prediction method and control technology of high-speed catamaran using the active hydrofoils. To establish the longitudinal motion equations of the ship basing on the 2.5D theory. Using the CFD software to obtain the hydrodynamic data of the hydrofoil. Bring the hydrodynamic expression of hydrofoils into the longitudinal motion equations of the ship. Predicting the longitudinal motion of High-speed catamaran before and after added the hydrofoils. A specific catamaran has been predicted with this approach, the result indicates this approach is workable and this prediction approach provides the theoretical basis for assessing the stabilization ability of appendages and possess the engineering practical value.
    Źródło:
    Polish Maritime Research; 2018, S 2; 56-61
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An experimental and numerical study of the vortices generated by hydrofoils
    Autorzy:
    Szantyr, J. A.
    Biernacki, R.
    Flaszyński, P.
    Dymarski, P.
    Kraskowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/258826.pdf
    Data publikacji:
    2009
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    marine propulsors
    vortex generation
    numerical methods
    experimental techniques
    Opis:
    The article presents the results of the research project concerning the process of formation of the tip vortices shed from hydrofoils of different geometry in different flow conditions. Three hydrofoils resembling the contemporary marine propeller blades have been selected for the study. The experimental part of the project consisted of the LDA measurements of the velocity field in three cross-sections of the vortex generated by the hydrofoils in the cavitation tunnel. The numerical part of the project consisted of calculations of the corresponding velocity field by means of three computer codes and several selected turbulence models. The comparative analysis of the experimental and numerical results, leading to the assessment of the accuracy of the numerical methods, is included.
    Źródło:
    Polish Maritime Research; 2009, 3; 11-17
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A method for the accurate numerical prediction of the tip vortices shed from hydrofoils
    Autorzy:
    Flaszyński, P.
    Szantyr, J. A.
    Dymarski, P.
    Kraskowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/259231.pdf
    Data publikacji:
    2010
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    marine propulsors
    vortex generation
    numerical methods
    experimental techniques
    Opis:
    The possibly accurate numerical prediction of the detailed structure of vortices shed from the tips of hydrofoils is an important element of the design process of marine propellers. The concentrated tip vortices are responsible for the propeller cavitation erosion and acoustic emission. The purpose of the project described in this paper was to develop the numerical method for prediction of the tip vortex structure. In the course of the project the numerical calculations were confronted with the results of experimental measurements. This led to creation of the specific method of construction of the computational grid and to selection of the optimum turbulence model. As a result the reliable method for the accurate numerical prediction of the concentrated tip vortices for different hydrofoil geometry and flow conditions has been developed and validated. This method enables elimination of the unfavourable phenomena related to the tip vortices in the course of the propeller design calculations.
    Źródło:
    Polish Maritime Research; 2010, 2; 10-17
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development of the Effective Underwater Speaker Sound Modulated by Audible Sound Frequency Range of Large Cetaceans for Avoidance with Ship Collision
    Autorzy:
    Yamada, H.
    Kobayashi, N.
    Nakashima, T.
    Kato, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/116934.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Cetaceans
    Underwater Speaker (UWS)
    Underwater Speaker Sound
    Audible Sound Frequency Range
    Hydrofoils
    Hydroacoustics
    Avoidance with Ship Collision
    Large Cetaceans
    Opis:
    The underwater speaker (UWS) has been installed on high speed vessels; hydrofoils (HF) with low-noise during their cruises, to avoid sudden collisions with large cetaceans, while its performance has remained uncertain because of the problem in quality of the produced sound. Thus, we developed a sound source for the UWS by modulating the sound based on the audible range of major large cetaceans so as to increase its utilities. To investigate the audible sound frequency range of cetacean, we tried two procedures, (1) indirect-estimation from relationship between cetaceans audibility and vocalization, and (2) indirect-estimation from measurements on the cochlear basal membrane. We also synthesized the two new sound sources which we can potentially expect an avoidance with large cetaceans. Through several field experiments with deploy the new sounds we reached a tentative conclusion that the new sound was effective in terms of inducing the cetaceans' avoidance reaction and would be also expected to be applied to other low-noise vessels.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2015, 9, 2; 213-217
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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