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    Wyświetlanie 1-4 z 4
    Tytuł:
    On autofrettage of cylinders by limiting circumferential residual stress based on Mises yield criterion
    Autorzy:
    Zhu, R.
    Zhu, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/281678.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    pressure vessel
    autofrettage
    load-bearing capacity
    strength theory
    Opis:
    The autofrettage technique is an effective and important measure to improve load-bearing capacity and safety and to even distributions of stresses for pressure vessels. Based on the classical fundamental theory on autofrettage and by theoretical analysis of residual stresses, the total stresses, the overstrain and the load-bearing capacity, etc., in view of the cylindrical pressure vessels with outside-to-inside radius ratio larger than the critical ratio, the laws contained in the autofrettage theory are revealed, the essential cause and reason for the obtained laws are analyzed, the inherent and meaning relations between various parameters in the autofrettage theory are brought to light, and the safe depth of the plastic zone (overstrain) as well as the conditions of loading or optimum operation conditions are found out. It is shown that under the optimum operation conditions, pressure vessels are not only safe but also economic, and the equations of the autofrettage theory are simplified greatly and are quite terse, as a result, the essential relations between various parameters in the autofrettage theory are distinct, and these equations are convenient for application in engineering practice.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2013, 51, 3; 697-710
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Behavior of helical piles - as a geoenvironmental choice - by frustum confining vessel (FCV)
    Autorzy:
    Khazaie, J.
    Eslami, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/102327.pdf
    Data publikacji:
    2016
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    helical pile
    environment
    geoenvironment
    frustum confining vessel (FCV)
    physical modeling
    bearing capacity
    Opis:
    Helical piles are environmental friendly and economical deep foundations that due to environmental considerations are excellent additions to the variety of deep foundation alternatives available to the practitioner. Helical piles performance depends on soil properties, the pile geometry and soil-pile interaction. Helical piles can be a proper alternative in sensitive environmental sites if their bearing capacity is sufficient to support applied loads. The failure capacity of helical piles in this study was measured via an experimental research program that carried out by Frustum Confining Vessel (FCV). FCV is a frustum chamber by approximately linear increase in vertical and lateral stresses along depth from top to bottom. Due to special geometry and applied bottom pressure, this apparatus is a proper choice to test small model piles which can simulate field stress conditions. Small scale helical piles are made with either single helix or more helixes and installed in fine grained sand with three various densities. Axial loading tests including compression and tension tests were performed to achieve pile ultimate capacity. Results indicate the helical piles behavior essentially depends on pile geometric characteristics, i.e. helix configuration and soil properties. According to the achievements, axial uplift capacity of helical model piles is about equal to usual steel model piles that have the helixes diameter. Helical pile compression bearing capacity is too sufficient to act as a medium pile, thus it can be substituted other piles in special geoenvironmental conditions. The bearing capacity also depends on spacing ratio, S/D, and helixes diameter.
    Źródło:
    Advances in Science and Technology. Research Journal; 2016, 10, 31; 8-22
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The impact of LNG carrier transit on fairway capacity
    Autorzy:
    Li, M.
    Mou, J.
    XinSheng, Z.
    Gong, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/135263.pdf
    Data publikacji:
    2018
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    waterborne transportation
    liquefied natural gas (LNG) ship
    approach channel capacity
    vessel traffic control
    fairway capacity
    LNG Port
    Opis:
    Liquefied natural gas (LNG), as one of the main sources of clean energy, has witnessed great growth in marine transportation in recent years. Due to the potential catastrophic consequences in case of a vessel traffic accident, the guidelines of the design of an LNG Port and the regulation of traffic management require that a mobile safety zone be set up for the transit of an LNG carrier, that is, a moving safety area around the carrier that excludes other ship traffic. To study the impact of a safety zone on channel capacity, this paper has presented a mathematical model to calculate the impact ratio of a large LNG ship on channel capacity considering different speeds and sailing modes. As a case study, an approach channel to a new LNG port that was developed in Yueqing bay, Zhejiang province, East China, has been analyzed during the concept design of the port with the aim of receiving ships with a capacity of 145,000 m3 . Based on the model, the impact ratio on the whole channel and the segmented channel when a carrier arrives at and leaves the berth has been calculated. The methodology can support the job of port design and vessel traffic management to improve the capacity, efficiency and safety of a waterway.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2018, 56 (128); 63-70
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Global optimal vessel capacity for LNG production and transportation
    Autorzy:
    Igboanusi, Cninemerem
    Amuji, Harrison Obiora
    Onukwube, Obioma G.
    Chikadibia, Nwosu Azuwueze
    Powiązania:
    https://bibliotekanauki.pl/articles/2141225.pdf
    Data publikacji:
    2022
    Wydawca:
    Fundacja Centrum Badań Socjologicznych
    Tematy:
    natural gas
    liquefied natural gas
    vessel capacity
    transportation
    linear programming
    Opis:
    In this paper, developed a linear programming model to determine the volume of vessels that will give an optimal return on investment. The solution to the developed model was carried out using the Interior Point algorithm with the help of the MATLAB package. The analysis observed that the production and transporting of the LNG with a vessel of capacity 178,5006m3 would give an optimal profit of 633,640 million USD. And from the results of the analysis, we observed that the decision to take the maximum modern capacity instead of lower capacities yields the highest profit.
    Źródło:
    Journal of Sustainable Development of Transport and Logistics; 2022, 7, 1; 82-89
    2520-2979
    Pojawia się w:
    Journal of Sustainable Development of Transport and Logistics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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