Janusz Kozak - Publications - Bridge of Knowledge

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Year 2023
  • A Generative Approach to Hull Design for a Small Watercraft
    Publication

    In the field of ocean engineering, the task of spatial hull modelling is one of the most complicated problems in ship design. This study presents a procedure applied as a generative approach to the design problems for the hull geometry of small vessels using elements of concurrent design with multi-criteria optimisation processes. Based upon widely available commercial software, an algorithm for the mathematical formulation of...

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  • ROLE OF GREEN LOGISTICS IN THE CONSTRUCTION OF SUSTAINABLE SUPPLY CHAINS
    Publication
    • N. D. K. Pham
    • G. H. Dinh
    • H. T. Pham
    • J. Kozak
    • P. N. Hoang

    - Polish Maritime Research - Year 2023

    The global supply chain has been growing strongly in recent years. This development brings many benefits to the economy, society, and human resources in each country but also causes a large number of concerns related to the environment since traditional logistics activities in the supply chain have been releasing significant amount of emissions. For that reason, many solutions have been proposed to deal with these environmental...

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  • USING ARTIFICIAL NEURAL NETWORKS FOR PREDICTING SHIP FUEL CONSUMPTION
    Publication
    • G. V. Nguyen
    • R. Sakthivel
    • K. Rudzki
    • J. Kozak
    • S. Prabhakar
    • N. D. K. Pham
    • P. Q. P. Nguyen
    • N. X. Phuong

    - Polish Maritime Research - Year 2023

    In marine vessel operations, fuel costs are major operating costs which affect the overall profitability of the maritime transport industry. The effective enhancement of using ship fuel will increase ship operation efficiency. Since ship fuel consumption depends on different factors, such as weather, cruising condition, cargo load, and engine condition, it is difficult to assess the fuel consumption pattern for various types...

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Year 2022
  • Crack Mouth Opening Displacement for EH36 Shipbuilding Steel Measurements
    Publication

    - Year 2022

    The dataset titled EH36 steel for shipbuilding (plate thicnkness 50mm) - CMOD - force record, a0/W = 0.6 contains CMOD (Crack Mouth Opening Displacement) - Force record which is the base for evaluation of fracture toughness of structural steel. Bend specimens witch Bx2B section (B= 50mm), and relative initial crack length a0 / W = 0.60 were used. The test was carried out at ambient temperature in accordance to ISO 12135 standard....

  • Crack Mouth Opening Displacement for EH36 Shipbuilding Steel Measurements Dataset
    Publication

    - Year 2022

    The dataset titled EH36 steel for shipbuilding (plate thickness 50 mm) – CMOD – force record, a0/W=0.6 contains a CMOD (Crack Mouth Opening Displacement) – Force record which is the base for evaluation of the fracture toughness of structural steel. Bend specimens with a Bx2B section (B = 50 mm), and relative initial crack length a0/W=0.60 were used. The test was carried out at ambient temperature in accordance with the ISO 12135...

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  • Influence of Material Thickness on the Ductile Fracture of Steel Plates for Shipbuilding
    Publication

    In the shipbuilding industry, the risk of brittle fractures is relatively high because some units operate in arctic or subarcticzones and use high thickness (up to 100 mm) steel plates in their structures. This risk is limited by employing certifiedmaterials with a specific impact strength, determined using the Charpy method (for a given design temperature) and byexercising control over the welding processes (technology qualification,...

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  • Prediction of Weld Deformations by Numerical Methods - Review
    Publication

    The welding process is the basic technique of joining in the shipbuilding industry. This method generates welding distortions that cause a lot of problems during the manufacturing process due to both the time and cost of straightening as well as their influence on later stages of production. Proper preparation of welding processes plays a growing role in the shipbuilding industry and the development of calculating tools is being...

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Year 2021
  • Joints Of Steel Sandwich Structures
    Publication

    Steel sandwich structures are perceived as alternatives to single-skin welded structures in the shipbuilding industry due its advantages like significant reduction of mass in relation to typical single skin structure. However, beside problems with their strength properties itself, applications in real structures requires of solving the problem of joining, both for connection sandwich to sandwich as well as sandwiches to single-shell...

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Year 2018
Year 2017
Year 2016
Year 2015
  • CTOD designation for WM and HAZ in butt joint made from S460 ML steel, Expertise No. WOiO/II/82/2015
    Publication

    Typical (normative) testing of materials and/or welded joints do not answer on all questions about material or welded joint properties. In ship building and off-shore sectors, many strucures requires materials and joint with higher than typical fatigue resistance. Imact tests, which are carried out during welding technology qualification, gives answer about ductility, CTOD tests results about material or welded joint ability to...

  • FEM modelling of stress and strain distribution in weld joints of steel sandwich panels
    Publication

    The development of laser welding technology has enabled the mass production of thin-walled structures, including steel sandwich panels. The technology of joining plating panels with stiffeners by welding allows us to create joints with a specific geometry and material properties. In comparison with other types of joints, laser welds are characterized by their specific behaviour under cyclic load and, as a consequence, a different...

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  • Inżynieria odwrotna w okrętownictwie
    Publication

    - Mechanik - Year 2015

    W procesie budowy i eksploatacji dużych obiektów inżynierskich często zachodzi potrzeba inwentaryzacji i odtworzenia stanu rzeczywistego kształtu czy też położenia elementów konstrukcji. Powody takiej potrzeby wynikają najczęściej z braku albo nieaktualności dokumentacji w procesie wytwarzania, a jeszcze częściej przebudowy czy modernizacji. Coraz częściej potrzeby takie pojawiają się w okrętownictwie. Proces tworzenia – niejako...

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  • Pomiary w procesie budowy kadłuba statku
    Publication

    - Year 2015

    Statki i obiekty oceanotechniczne to największe ruchome ruchome dzieła sztuki inżynierskiej. Budowie takich kolosów towarzyszą procesy pomiarowe – nierzadko na odległości przekraczające kilkaset metrów i dokładnościach milimetrowych. Tak było kilkaset lat temu i tak jest dzisiaj. Pomimo niezmienności praw fizyki i zasad geometrii przestrzennej, w metrologii okrętowej – tak jak w innych dziedzinach życia – zachodzą zmiany. Pojawienie...

  • Problems of Determination of Welding Angular Distortions of T-fillet Joints in Ship Hull Structures
    Publication

    Ship hull structure elements are in majority joined by welding. Welding distortions can cause a lot of problems during the manufacturing process. In the literature it is proposed wide spectrum of suggestions for a correct estimation of welding deformation in particular angular deformation in the fillet welded T joint. In the work verification of selected methods is proposed basing upon of the results of the laboratory measurements....

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  • Strength analysis of the support structure of the offshore wind turbine
    Publication

    - Year 2015

    The global power demand from renewable sources is growing. One of a very favorable solution which meets severe environmental protection requirements are the offshore wind turbines. The offshore wind energy sector has experienced very fast development over last decade. Offshore wind farms, in comparison with onshore applications, can provide increased efficiency with reduced noise, visual, transportation and installation con-flicts....

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  • THE INFLUENCE OF MANUFACTURING OVERSIZING ON POSTWELDING DISTORTIONS OF THE FILLET WELDED JOINT
    Publication

    Welding proces is basic joining technique in shipbuilding. Such method generated welding distortions which cause a lot of problems during the manufacturing process. In the literature it is proposed wide spectrum of suggestions for a correct estimation of welding deformation in particular angular deformation in the fillet welded T joint. In the work influence of oversizing of weld on angular distortions of joint is presented basing...

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  • The Influence of Modelling Material Zones on Strains and Stresses at Weld Toe Notch
    Publication

    The latest development in the field of welding technology enabled prefabrication of thin-walled sandwich structures in an industrial scale. Sandwich structures fabricated of steel, or aluminium alloy plates and stiffeners are welded with the use of hi-power CO2 lasers. Strength analysis of such structures with the use of finite element method needs proper material modelling.In this paper the material model of steel sandwich panel...

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  • The Influence of Selected Parameters of Numerical Modelling on Strains and Stresses at Weld Toe Notch
    Publication

    - Year 2015

    Latest development in the field of welding technology and prefabrication enabled massive production of thin-walled sandwich structures. Multi-layered sandwich structures are fabricated with the use of high-power CO2 lasers, friction welding, arc welding, hybrid welding, or other technique designed for the special purpose. Steel or aluminium alloy plates with thickness between 1 and 5 mm are connected by internal stiffeners. Strength...

Year 2014
Year 2013
  • Innovative design of hybrid powered inland vessel
    Publication

    - Year 2013

    One of the most demanding task for European countries is rational transportation system taking into account fuel efficient and ecological propulsion. The paper presents innovative design of hybrid powered inland vessel. The most important aspects regarding new design and technical solutions are being presented, including numerical and experimental research on hull form. Combined diesel-electric propulsion supported by solar panel...

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  • Projekt i wykonanie łodzi regatowej zasilanej energią słoneczną
    Publication

    Wzrastające z roku na rok zużycie energii na naszej planecie i związanie z tym kurczenie się zapasów powszechnie wykorzystywanych nośników energii oraz wynikające z ich stosowania niekorzystne skutki dla środowiska naturalnego powodują, że ludzkość sięga w stronę odnawialnych źródeł energii. Problem ten dotyka także zagadnień napędu jednostek pływających. Jednym z potencjalnie interesujących źródeł energii jest energia słoneczna....

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Year 2012
Year 2011

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