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    Wyświetlanie 1-14 z 14
    Tytuł:
    Influence of pitting corrosion on fatigue and corrosion fatigue of ship structures. Part I Pitting corrosion of ship structures
    Autorzy:
    Jakubowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/260006.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    pitting corrosion
    ship structures
    offshore structures
    Opis:
    The present paper is a literature survey focused on a specific kind of corrosion, i.e. pitting corrosion and its influence on fatigue of ship and offshore steels. Mechanisms of a shortand long-term pitting corrosion in marine environment have been described including pit nucleation and growth phases. Some models of pit growth versus time of exposure have been presented. Some factors which influence the pit growth rate have been discussed briefly.
    Źródło:
    Polish Maritime Research; 2014, 1; 62-69
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of pitting corrosion on fatigue and corrosion fatigue of ship and offshore structures. Part II: load - pit - crack interaction
    Autorzy:
    Jakubowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/260195.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    pitting corrosion
    fatigue
    ship structures
    offshore structures
    Opis:
    In the paper has been discussed influence of stresses on general corrosion rate and corrosion pit nucleation rate and growth , whose presence has been questioned by some authors but accepted by most of them. Influence of roughness of pit walls on fatigue life of a plate suffering pit corrosion and presence of the so called „ non-damaging” pits which never lead to initiation of fatigue crack, has been presented. Possibility of prediction of pit-to-crack transition moment by two different ways, i.e. considering a pit a stress concentrator or an equivalent crack, has been analyzed. Also, influence of statistical distribution of depth of corrosion pits as well as anticorrosion protection on fatigue and corrosion fatigue has been described.
    Źródło:
    Polish Maritime Research; 2015, 3; 57-66
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of pitting corrosion on strength of steel ships and offshore structures
    Autorzy:
    Jakubowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/260055.pdf
    Data publikacji:
    2011
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    pitting corrosion
    strength
    shipbuilding steels
    ship structures
    Opis:
    The present paper deals with the influence of pitting corrosion on mechanical properties of mild and low alloy steels and strength of steel structures under static and quasi-static loads. Pitting corrosion is a very important phenomenon that influence local strength of ship hull members. The present paper is based mainly on Japanese publications. Analyzing the standard tensile diagrams one can see that that pitting corrosion reduces the load corresponding to yield stress (YS) and, even more markedly, tensile strength UTS, reduces almost to zero plastic flow strains at YS load level and dramatically reduces the total elongation to fracture. Nominal UTS load for uniformly corroded specimens is higher than that for pitted specimens at the same average thickness loss. The strength related to the true fracture surface area (i.e. reduced by pits, taking into account real path of the crack through the pits) is almost independent of the thickness loss and is almost the same as for uniform thickness loss. For wide specimens the tensile strength depends mainly on the local deformation ability, and the maximum loading ability for large members, predicted on the base of the total true fracture surface area, can be overestimated. Concept of equivalent thickness loss for plates under bending and compression and for more complex structural models as well as relation between the average and the equivalent thickness losses has been presented. Approach based on degree of pitting (ratio of pitted area to total plate surface area) has been shown as a real and more convenient than the approach based on the thickness loss.
    Źródło:
    Polish Maritime Research; 2011, 4; 54-58
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural reliability assessment of corroded tanker ship based on experimentally estimated ultimate strength
    Autorzy:
    Woloszyk, Krzysztof
    Garbatov, Yordan
    Powiązania:
    https://bibliotekanauki.pl/articles/259065.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    ship structures
    reliability assessment
    corrosion
    ultimate strength
    tanker ship
    Opis:
    This work deals with the reliability assessment of a tanker ship hull structure subjected to a vertical bending moment and corrosion degradation. The progressive collapse and ultimate load carrying capacity are estimated based on experimentally tested scaled box-shaped-specimens. The translation of the strength estimate of the scaled specimen to the real tanker ship hull structure is performed based on the dimensional theory developing a step-wise linear stressstrain relationship. The load-carrying capacity is considered as a stochastic variable, and the uncertainties resulted from the scaled-specimen to the real-structure strength translation, and the subjected load of the real ship are also accounted for. A sensitivity analysis concerning the stochastic variables, included in the ultimate limit state function is performed. The partial safety factors, in the case of a scaled specimen and real structure, are also identified, and conclusions are derived.
    Źródło:
    Polish Maritime Research; 2019, 2; 47-54
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design criteria for scantling of longitudinal and transverse connections in the torsion box under fatigue loading
    Autorzy:
    Silva-Campillo, Arturo
    Suárez-Bermejo, Juan Carlos
    Herreros-Sierra, Miguel Ángel
    Powiązania:
    https://bibliotekanauki.pl/articles/1573576.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    fatigue life
    ship structures
    crack growth
    fracture
    Opis:
    Fatigue is one of the main failure modes in marine structures, and it is caused by the strong cyclic characteristics of the loads they support. This failure mode is amplified in areas of high stress concentration, such as at the intersection of primary and secondary elements. In this paper, a two-phase study is proposed that compares numerical and experimental results using a digital image correlation technique. The described procedure establishes selection, design, and scantling criteria and provides recommendations for the design of the transverse structure using specimens with different geometries. These geometries correspond to different designs for the transverse primary structure that use a longitudinal secondary stiffener with variable thickness and longitudinal spacing to transverse in a dynamic and quasi-static regime. The stress state for this regime is calculated based on the biaxiality indication concept, which uses the fatigue phenomenon (safety factor and sensitivity curves) and fracture mechanics (parameters of the Paris crack propagation law, correlation value, and law of variation of the stress intensity factor).
    Źródło:
    Polish Maritime Research; 2021, 2; 116-127
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of the Applicability of Aluminum Alloy Welding Processes during the Prefabrication of Ship Structures Based on the Multi-Index Method
    Autorzy:
    Urbański, Tomasz
    Taczała, Maciej
    Wąs, Dariusz
    Powiązania:
    https://bibliotekanauki.pl/articles/2201867.pdf
    Data publikacji:
    2023
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    ship structures
    prefabrication process
    aluminum alloys welding
    welding processes
    evaluation criteria
    multi-index evaluation
    Opis:
    The purpose of the paper is to evaluate the processes of welding aluminum alloys in terms of their applicability to the process of prefabrication of ship structures. The prefabrication process requires solving a number of problems related to the welding processes used (e.g. the problem of welding incompatibilities, deformations). Therefore, the key issue is to choose the right welding process, which is complex and difficult. It requires analysis of the process considering many points of view (e.g. technological, economic, security) in order to maximize the objectivity of the choice. Therefore, an attempt at a comprehensive view requires the formulation of a set of accurate evaluation criteria. The multi-indicator expert assessment presented in the article makes it possible to make such a choice. Currently used methods of welding aluminum alloys, both those from the group of conventional and innovative methods, were assessed. As a result of the analysis, the so-called technological hierarchy that allows to rank the assessed processes in terms of their suitability in the process of prefabrication of ship structures.
    Źródło:
    Advances in Science and Technology. Research Journal; 2023, 17, 1; 133--139
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Methodology of threat autonomous assessment and forecasting the lifetime of the marine structure
    Autorzy:
    Murawski, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/245864.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    monitoring systems
    non-destructive tests
    ship structures lifetime prediction
    damage identification
    damage localization
    lifetime forecasting
    Opis:
    Structural Health Monitoring (SHM) is a natural extension and supplement of Non-Distractive Tests (NDT). Structure assessment during periodical NDT tests is performed by highly trained human team. However, during long sea voyage, ship crew has no knowledge and possibility for detailed assessment and, what is more, has no knowledge lifetime predicting of ship structure. SHM systems should have good designed sensors types, distribution, and automatic recording unit. However, most important (and most difficult for designing) is autonomous and self-contained procedures for marine structures hazard assessment. In the paper, basic assumptions for numerical algorithms of signal processing, damage identification and localization, threat assessment and forecasting of structure lifetime are presented. SHM systems can be based on several different measurements techniques like: comparative vacuum monitoring, electromagnetic layer, Lamb waves, vibration based methods, acoustic emission, and fibre optics. Last three methods are most promising in the marine environment, according to the author experience. Global ship hull deformation should be monitored as quasi-continuous measurements. Optical Time-Domain Reflectometer method (OTDR) is planned by author for hull global deformation monitoring. Some local strain-stress concentration of hull structure and propulsion system bearings' reactions will be monitored by Fibre Bragg Grating (FBG) sensors. Both techniques (OTDR and FBG) have been shortly described in the paper.
    Źródło:
    Journal of KONES; 2015, 22, 2; 163-168
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sandwich panels in shipbuilding
    Autorzy:
    Metschkow, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/260538.pdf
    Data publikacji:
    2006
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    laser welding
    laser welded steel panels
    I-core panels
    connection of panels
    double-skin structure
    ship structures
    Opis:
    In this paper a short historical outline of laser technique development and its application to welding sandwich panels, is presented. Laser-welded sandwich panels of different geometry, today introduced in industrial scale, were described. Prefabrication process of folded ship constructions, in particular, of panel-to-panel connections and hybrid (sandwich panel – conventional construction) structures, was discussed. Attention was paid to various aspects of prefabrication, assembly and use of panel constructions.
    Źródło:
    Polish Maritime Research; 2006, S 1; 5-8
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On long-term prediction of stresses in principal members of ship hull structures. Current report
    Autorzy:
    Bogdaniuk, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/259393.pdf
    Data publikacji:
    2004
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    Rules for classification of ships
    spactral analysis of wave loads on ships
    dynamic stresses in ship hull structures
    Opis:
    The paper presents a discussion on the strength criteria and load cases required in the rules of classification societies for direct FEM strength analysis of ship hull structures, which show some differences to each other. The conclusion of it is that detail studies on stress values in ship structures are necessary to improve the requirements. With this end in view an effective method for long-term prediction of stresses in ship hull structure princiŹpal members is proposed. The method is based on the concept of influence coefficients and spectral analysis of wave loads. A FEM model of the principal member system in the form of 3D frame is applied to calculate values of the influence coefficients. Next, the concept is used of correlaŹtion factors for combining characteristic long-term stress values caused by global and local loads, with combined stresses due to general bending of the ship, zone bending of the principal members and local bending of longitudinals. As an example, results of stress prediction and correlation factors calculated in some points of hull structure of a panamax bulk carrier are presented and discussed.
    Źródło:
    Polish Maritime Research; 2004, 3; 3-6
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of steel sandwich panels to hull structure of two-segment inland navigation passenger ship
    Autorzy:
    Szarnik, A.
    Kuryłko, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/260350.pdf
    Data publikacji:
    2006
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    inland navigation passenger ship
    sandwich panels
    sandwich structures
    Opis:
    This paper presents a concept of hull structure of novel environment-friendly inland navigation and coastal ships for Polish east-west waterways. In compliance with its assumptions the inland navigation passenger ship is designed in the form of two mutually connected segments : a propulsion segment which contains gastronomy and entertainment infrastructure and crew accommodations and an articulated hotel segment. In this paper attention is focused on solutions of the hotel segment of an innovative structure mainly consisted of steel polyurethane-filled sandwich panels. Similar structural solution is intended for the propulsion segment.
    Źródło:
    Polish Maritime Research; 2006, S 2; 85-87
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Concept of barge hull structure made of extruded aluminium panels
    Autorzy:
    Bogdaniuk, M.
    Górecki, Z.
    Łukowski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/260354.pdf
    Data publikacji:
    2006
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    inland waterways ships
    ship hull strength
    structures composed of aluminium panels
    Opis:
    A design of the hotel barge of 52 m overall length and 9 m breadth , intended for inland waterway shipping on the route from Berlin to Kaliningrad, is presented. Hull of the barge is characterized by a unique structure consisted of densely stiffened aluminium panels of 4.5 mm plate thickness and 70 mm depth of stiffeners, supported by transverse walls or girders. The stiffeners of the panels are longitudinally directed. Also, are described problems associated with assurance of adequate strength and stiffness of such structure, resulting from a limited maximum depth of the barge.
    Źródło:
    Polish Maritime Research; 2006, S 2; 88-90
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An investigation of ship airwakes by scale adaptive simulation
    Autorzy:
    Shukla, S.
    Singh, S. N.
    Sinha, S. S.
    Vijayakumar, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/116802.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    applications for navy
    ship airwakes
    Scale Adaptive Simulation (SAS)
    simulation
    flow phenomena
    turbulent structures
    investigation by simulation
    ship airwakes flow characteristic
    Opis:
    An early assessment of the ship airwakes flow characteristic is one of the most challenging tasks associated with the designing of vessels. The presence of ship airwake creates very complex flow phenomena due to the presence of strong velocity gradients in space and time and widely varying high levels of recirculation and turbulence. Under such condition, the landing and take-off operation of a helicopter over the ship helodeck is very complex and accurate prediction represents a computational challenge. We present time-accurate scale-adaptive simulation (SAS) of turbulent flow around a simple frigate ship to gain insight into the flow phenomena over the helodeck. Numerical analysis is carried out after several grids and time-steps refinement to ensure the spatial and temporal accuracy of the numerical data. The instantaneous iso-surface of eddy flow structures and vorticity have been analysed across the vertical and longitudinal plane. Results show good agreement with experimental data. Comparisons of mean quantities and velocity spectra show good agreement, indicating that SAS can resolve the large-scale turbulent structures which can adversely impact ship-helo combined operations. Overall, the SAS approach is shown to capture the unsteady flow features of massively separated ship airwake characteristics with reasonable accuracy.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2020, 14, 2; 471-475
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ocena głębokości toru podejściowego na południe od Ławicy Słupskiej w aspekcie obsługi jednostek o maksymalnych gabarytach - metoda rozbudowana
    Estimation of approach lanes deapth south of Slupsk Sandbank with regard to services provided for vessels of maximum dimensions - extended method
    Autorzy:
    Rutkowski, G.
    Królikowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/222920.pdf
    Data publikacji:
    2010
    Wydawca:
    Akademia Marynarki Wojennej. Wydział Dowodzenia i Operacji Morskich
    Tematy:
    tor podejściowy
    Rynna Słupska
    maksymalne zanurzenie statku
    rezerwa nawigacyjna głębokości
    budowle hydrotechniczne
    approach lane
    Slupsk Trough
    maximum draught of ship
    navigational reserve of depth
    marine structures
    Opis:
    Artykuł obejmuje ocenę maksymalnego zanurzenia statku handlowego, który przy działaniu różnych warunków zewnętrznych (przeciętnych i ekstremalnych) mógłby bezpiecznie prowadzić żeglugę (manewrować) w Rynnie Słupskiej, zachowując przy tym wymagany zapas wody pod stępką, czyli minimalną rezerwę nawigacyjną głębokości. Do określenia maksymalnego zanurzenia statku posłużymy się metodą praktyczną, wykorzystując definicję ryzyka nawigacyjnego oraz model przestrzenny domeny statku. Otrzymane wyniki porównamy z wytycznymi Rozporządzenia Ministra Transportu i Gospodarki Morskiej z dnia 01.06.1998 r. w sprawie warunków technicznych, jakim powinny odpowiadać morskie budowle hydrotechniczne obsługujące statki o określonych gabarytach.
    The paper includes an analysis of maximum draught of a merchant vessel to maintain safety of navigation in different external condition (average and extreme) in Slupsk Trough and keep required under keel clearance, i.e. navigational reserve of depth. To determine the maximum draught of a vessel we use practical method which incorporates risk of navigational and three- -dimensional model of ship’s domain. The results obtained will be compared with guidelines published by Decree of Minister of Transport and Maritime Economy dated 01 June 1998 on technical conditions to be met by hydro mechanical marine structures which provide service for vessels of specific dimensions.
    Źródło:
    Zeszyty Naukowe Akademii Marynarki Wojennej; 2010, R. 51 nr 1 (180), 1 (180); 81-96
    0860-889X
    Pojawia się w:
    Zeszyty Naukowe Akademii Marynarki Wojennej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ocena głębokości toru podejściowego na południe od Ławicy Słupskiej w aspekcie obsługi jednostek o maksymalnych gabarytach - metody uproszczone
    Estimation of approach lanes deapth south of slupsk sandbank with regard to services provided for vessels of maximum dimensions - simplified methods
    Autorzy:
    Rutkowski, G.
    Królikowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/223344.pdf
    Data publikacji:
    2009
    Wydawca:
    Akademia Marynarki Wojennej. Wydział Dowodzenia i Operacji Morskich
    Tematy:
    tor podejściowy
    Rynna Słupska
    maksymalne zanurzenie statku
    rezerwa nawigacyjna głębokości
    budowle hydrotechniczne
    approach lane
    maximum draught of ship
    Slupsk Trough
    navigational reserve of depth
    marine structures
    Opis:
    Artykuł obejmuje ocenę maksymalnego zanurzenia statku handlowego, który przy działaniu różnych warunków zewnętrznych (przeciętnych i ekstremalnych) mógłby bezpiecznie prowadzić żeglugę (manewrować) w „Rynnie Słupskiej”, zachowując przy tym wymagany zapas wody pod stępką, czyli minimalną rezerwę nawigacyjną głębokości. Do określenia maksymalnego zanurzenia statku posłużymy się metodą praktyczną, wykorzystując definicję ryzyka nawigacyjnego oraz model przestrzenny domeny statku. Otrzymane wyniki porównamy z wytycznymi Rozporządzenia Ministra Transportu i Gospodarki Morskiej z dnia 01.06.1998 r. w sprawie warunków technicznych, jakim powinny odpowiadać morskie budowle hydrotechniczne obsługujące statki o określonych gabarytach.
    The paper includes an analysis of maximum draught of a merchant vessel to maintain safety of navigation in different external condition (average and extreme) in ‘Slupsk Trough’ and keep required under keel clearance, i.e. navigational reserve of depth. To determine the maximum draught of a vessel we use practical method which incorporates risk of navigational and three- -dimensional model of ship’s domain. The results obtained will be compared with guidelines published by Decree of Minister of Transport and Maritime Economy dated 01 June 1998 on technical conditions to be met by hydro mechanical marine structures which provide service for vessels of specific dimensions.
    Źródło:
    Zeszyty Naukowe Akademii Marynarki Wojennej; 2009, R. 50 nr 4 (179), 4 (179); 35-50
    0860-889X
    Pojawia się w:
    Zeszyty Naukowe Akademii Marynarki Wojennej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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