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    Wyświetlanie 1-3 z 3
    Tytuł:
    Repellence Effect of the New Sound for Underwater Speaker of Hydrofoil
    Autorzy:
    Nakashima, T.
    Kobayashi, N.
    Yamada, H.
    Katsumata, T.
    Yoshida, R.
    Kato, H.
    Okabe, H.
    Kawazu, I.
    Yanase, Y.
    Omine, M.
    Terada, M.
    Sugioka, H.
    Kyo, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/116522.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Underwater Speaker (UWS)
    Hydrofoil
    Underwater Speaker Sound
    Humpback Whale
    New Sound
    Cetaceans
    Acoustics
    Hydroacoustics
    Opis:
    In order to prevent hydrofoil colliding with cetaceans, the underwater speaker (UWS) has been installed to repel cetaceans. Yamada et al. (2012) analyzed and devised the UWS sound as it fits the cetaceans' acoustic properties to prevent the collision furthermore. The new UWS sound was devised and synthesized by Yamada et al. (2015) with expectation of avoiding collision with large cetaceans (Patent applied for, JP2014-171411). In this research project, the new UWS sound was investigated by the playback experiment on humpback whale (Megaptera novaeangliae) and by sighting survey in the actual hydrofoil shipping service route. As a result, a physiological and behavioral change of the humpback whale was observed in the playback experiment of the new UWS sound, and the chance of hydrofoil encountering cetaceans of the new UWS sound was smaller than that of the previous UWS sound. Therefore, the improvement of the new UWS sound was confirmed. Lastly, we wish this research project would contribute toward the safer cruise of hydrofoil in the future.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2015, 9, 2; 207-211
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of the injection frequency on the urea selective catalytic reduction systems performance
    Autorzy:
    Rogóż, R.
    Jaworski, P.
    Kapusta, Ł. J.
    Teodorczyk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/133789.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    AVL FIRE
    selective catalytic reduction
    uniformity index
    urea water solution
    UWS
    wall-film
    selektywna redukcja katalityczna
    roztwór mocznika
    Opis:
    This study presents the influence of the UWS injection frequency on a close coupled SCR systems performance. The investigation was performed with the CFD tool AVL Fire. In the paper the analysis of four different UWS injection frequencies in the three different operating points of diesel engine was shown. The assessments of the system performance was referred to the ammonia distribution at catalyst intake and wall film formation inside the investigated geometry, as these are considered as crucial in such a configuration. The results showed that injection frequency affects both factors on different level depending from the flow conditions. In addition, the wall film crystallization risk was discussed basing on the obtained wall film characteristics.
    Źródło:
    Combustion Engines; 2017, 56, 3; 73-77
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    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 1-3 z 3

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