Rok 2015

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

  Publikacja

  • J. Kozak
  • J. Kowalski

  - Polish Maritime Research - Rok 2015

  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 Proposal to “Snapshot” Raim Method for Gnss Vessel Receivers Working in Poor Space Segment Geometry

  Publikacja

  • A. Nowak

  - Polish Maritime Research - Rok 2015

  Nowadays, we can observe an increase in research on the use of small unmanned autonomous vessel (SUAV) to patrol and guiding critical areas including harbours. The proposal to “snapshot” RAIM (Receiver Autonomous Integrity Monitoring) method for GNSS receivers mounted on SUAV operating in poor space segment geometry is presented in the paper. Existing “snapshot” RAIM methods and algorithms which are used in practical applications...

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• Tryton Supercomputer Capabilities for Analysis of Massive Data Streams

  Publikacja

  • H. Krawczyk
  • M. Nykiel
  • J. Proficz

  - Polish Maritime Research - Rok 2015

  The recently deployed supercomputer Tryton, located in the Academic Computer Center of Gdansk University of Technology, provides great means for massive parallel processing. Moreover, the status of the Center as one of the main network nodes in the PIONIER network enables the fast and reliable transfer of data produced by miscellaneous devices scattered in the area of the whole country. The typical examples of such data are streams...

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Rok 2021

• The influence of selected strain-based failure criteria on ship structure damage resulting from a collision with an offshore wind turbine monopile

  Publikacja

  • K. Niklas
  • A. Bera

  - Polish Maritime Research - Rok 2021

  Offshore wind farms are developing well all over the world, providing green energy from renewable sources. The evaluation of possible consequences of a collision involves Finite Element computer simulations. The goal of this paper was to analyse the influence of selected strain-based failure criteria on ship damage resulting from a collision with an offshore wind turbine monopile. The case of a collision between an offshore supply...

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• The Matter of Decision-Making Control Over Operation Processes of Marine Power Plant Systems with the Use of their Models in the form of Semi-Markov Decision-Making Processes

  Publikacja

  • J. Girtler
  • J. Rudnicki

  - Polish Maritime Research - Rok 2021

  The article presents the possibility to control the real operation process of an arbitrary device installed in the marine power plant based on the four-state semi-Markov process, being the model of the process, which describes the transition process of operational states of the device and the transition process of its technical states. All these states are precisely defined for the ship main engine (SG). A hypothesis is proposed...

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• Ultimate compressive strength assessment of uncleaned and cleaned corroded plates with locked crack

  Publikacja

  • K. Wołoszyk
  • Y. Garbatov

  - Polish Maritime Research - Rok 2021

  The work presented here investigates the structural response of cleaned corroded plates, subjected to compressive load in the presence of a locked crack, where the change of mechanical properties as a result of corrosion development and the cleaning process is also accounted for. A Finite Element model for assessing the compressive strength, considering geometric and material nonlinearities, is developed, and the analysed plates...

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Rok 2020

• The Influence of the Cuboid Float’s Parameters on the Stability of a Floating Building

  Publikacja

  • A. Karczewski
  • Ł. Piątek

  - Polish Maritime Research - Rok 2020

  Usually, the concept of sufficient stability of a floating structure is connected with the capacity to keep a small heel angle despite the moment of heeling. The variable responsible for these characteristics is the initial metacentric height, which is the relation between the hydrostatic features of the pontoon and the mass properties of the entire object. This article answers the questions of how heavy the floating system should...

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• The Influence of Water and Mineral Oil on Mechanical Losses in a Hydraulic Motor for Offshore and Marine Applications

  Publikacja

  • P. Śliwiński

  - Polish Maritime Research - Rok 2020

  In this paper, mechanical losses in a hydraulic motor supplied with water and mineral oil (two liquids having significantly different viscosity and lubricating properties) are described and compared. The experimental tests were onducted using a special design (prototype) of a hydraulic satellite motor. The design of the satellite motor is presented. This motor was developed to supply both with water and mineral oil and features...

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• Towards Improving Optimised Ship Weather Routing

  Publikacja

  • R. Vettor
  • J. Szłapczyńska
  • R. Szłapczyński
  • W. Tycholiz
  • C. G. Soares

  - Polish Maritime Research - Rok 2020

  The aim of the paper is to outline a project focusing on the development of a new type of ship weather routing solution with improved uncertainty handling, through better estimation of ship performance and responses to sea conditions. Ensemble forecasting is considered to take into account the uncertainty levels that are typical of operations in a stochastic environment. Increased accuracy of weather prediction is achieved through...

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• Underwater Navigation Ssystem Based on Doppler Shift – Measurements and Error Estimations

  Publikacja

  • Z. Ostrowski
  • R. Salamon
  • I. Kochańska
  • J. Marszal

  - Polish Maritime Research - Rok 2020

  A new acoustic navigation system was developed to determine the position and speed of moving underwater objects such as divers and underwater vehicles. The path of an object and its speed were determined by the Doppler shifts of acoustic signals emitted by a transmitter placed on the object and received by four hydrophones installed at the periphery of the monitored body of water. The position and speed measurements were affected...

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• Validation Process for Computational Model of Full-Scale Segment for Design of Composite Footbridge

  Publikacja

  • T. Ferenc
  • T. Mikulski

  - Polish Maritime Research - Rok 2020

  Experimental tests and numerical simulations of a full-scale segment of a foot and cycle bridge made of polymer composites are presented in the paper. The analysed structure is made of sandwich panels, which consist of glass fibre reinforced polymer (GFRP) multi-layered laminate faces and a PET foam (obtained from recycling) core. The dimensions of the segment cross-section are the same as for the target footbridge; however, span...

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Rok 2018

• THE INFLUENCE OF WATER AND MINERAL OIL ON MECHANICAL LOSSES IN THE DISPLACEMENT PUMP FOR OFFSHORE AND MARINE APPLICATIONS

  Publikacja

  • P. Śliwiński

  - Polish Maritime Research - Rok 2018

  In this paper mechanical losses in a positive displacement pump supplied with water and mineral oil (two liquids having significantly different viscosity and lubricating properties) are described and compared. The experimental tests were conducted using a special design (prototype) of a satellite pump. The design of the satellite pump is presented in the article. The pump features a non-circular tooth working mechanism. This pump...

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• The propagation of the waves in the CTO S.A. towing tank

  Publikacja

  • M. Drzewiecki

  - Polish Maritime Research - Rok 2018

  The paper presents the results of research focused on the wave propagation in the CTO S.A. deepwater towing tank. In the scope of paper, the wavemaker transfer function was determined for regular waves, based on the Biésel Transfer Function and further for irregular waves, based on Hasselman model of nonlinear energy transfer. The phenomena: wave damping, wave breakdown and wave reflection, were measured, analyzed and mathematically...

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• Vertical motions damping model test of a lifeboat lowered onto a flat sea surface

  Publikacja

  • A. Kniat
  • P. Dymarski

  - Polish Maritime Research - Rok 2018

  The article presents the experiment’s results of the lifeboat model lowered with an initial speed and then released to fall onto a flat water surface. The purpose of the research is to determine the trajectory of the vertical boat motion and describe it with a mathematical model. This is closely related to determining the damping factor since the vertical motion is damped and the lifeboat gets balanced and stops moving after some...

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Rok 2017

• The influence of water and mineral oil on volumetric losses in a hydraulic motor

  Publikacja

  • P. Śliwiński

  - Polish Maritime Research - Rok 2017

  In this paper volumetric losses in hydraulic motor supplied with water and mineral oil (two liquids having significantly different viscosity and lubricating properties) are described and comparison. The experimental tests were conducted using an innovative hydraulic satellite motor, that is dedicated to work with different liquid, including water. The sources of leaks in this motor are characterized and described also. On this...

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• Theoretical Model of Acoustic Wave Propagation in Shallow Water

  Publikacja

  • E. Kozaczka
  • G. Grelowska

  - Polish Maritime Research - Rok 2017

  The work is devoted to the propagation of low frequency waves in a shallow sea. As a source of acoustic waves, underwater disturbances generated by ships were adopted. A specific feature of the propagation of acoustic waves in shallow water is the proximity of boundaries of the limiting media characterised by different impedance properties, which affects the acoustic field coming from a source situated in the water layer “ deformed”...

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• TOTAL SHIP OPERABILITY – REVIEW, CONCEPT AND CRITERIA

  Publikacja

  • M. H. Ghaemi
  • H. Olszewski

  - Polish Maritime Research - Rok 2017

  The ship operability can be understood and analysed in different manners, and its quality is described using different indexes by different authors. Practically, there is no general and widely accepted description of total ship operability in the literature, nor in the rules of classification societies, which would include both seakeeping and manoeuvrability characteristics of a ship, and simultaneously take into account all ship...

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• Underwater Wet Repair Welding of API 5L X65M Pipeline Steel

  Publikacja

  • G. Rogalski
  • D. Fydrych
  • J. Łabanowski

  - Polish Maritime Research - Rok 2017

  This paper presents results of the research of effect of polymer insulation of pipeline made of API 5L X65M steel as well as underwater wet welding parameters on properties of joints made by covered electrodes. Effect of heat input on structure and hardness of joints during repair of underwater pipeline was analyzed. Welding defects like microcracks, micro-lacks of fusion, slag inclusions, as well as HAZ hardness increase over...

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• VARIANT DESIGNING IN the PRELIMINARY SMALL SHIP DESIGN PROCESS

  Publikacja

  • A. Karczewski
  • J. Kozak

  - Polish Maritime Research - Rok 2017

  Ship designing is a complex process, as the ship itself is a complex, technical multi-level object which operates in the air/water boundary environment and is exposed to the action of many different external and internal factors resulting from the adopted technical solutions, type of operation, and environmental conditions. A traditional ship design process consists of a series of subsequent multistage iterations, which gradually...

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• Visualization of a lifeboat motion during lowering along ship’s side

  Publikacja

  • A. Kniat

  - Polish Maritime Research - Rok 2017

  This paper presents description of a computer program for motion visualization of a lifeboat lowered along ship’s side. The program is a post-processor which reads results of numerical calculations of simulated objects’ motions. The data is used to create scene composed of 3D surfaces to visualize mutual spatial positions of a lifeboat, ship’s side and water waving surface. Since the numerical data contain description of a simulation...

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Rok 2019

• The influence of water and mineral oil on volumetric losses in the displacement pump for offshore and marine applications

  Publikacja

  • P. Śliwiński

  - Polish Maritime Research - Rok 2019

  In this paper volumetric losses in a positive displacement pump supplied with water and mineral oil are described and compared. The experimental tests were conducted using a prototype of a satellite pump (with a non-circular tooth working mechanism). In this paper the sources of volumetric losses in this pump are characterised. On this basis, a mathematical model of these losses has been presented. The results of the calculation...

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• Universal autonomous control and management system for multipurpose unmanned surface vessel

  Publikacja

  • A. Stateczny
  • P. Burdziakowski

  - Polish Maritime Research - Rok 2019

  The paper presents design, structure and architecture of the Universal Autonomous Control and Management System (UACAMS) for multipurpose unmanned surface vessel. The system was designed, installed and implemented on the multipurpose platform - unmanned surface vessel named HydroDron. The platform is designed to execute hydrographic survey missions with multi-variant configuration of the survey system (payload? ) including multi-beam...

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Rok 2009

• The operating field of a hydrostatic drive system. Parameters of the energy efficiency investigations of pump and hydraulic motors

  Publikacja

  • Z. Paszota

  - Polish Maritime Research - Rok 2009

  Przedstawiono pole pracy układu napędu hydrostatycznego. Uzasadniono podział parametrów pracy silnika hydraulicznego i pompy na parametry niezależne i zależne od pracy tych maszyn wyporowych i układu z nich utworzonego. Zaproponowano podjęcie tematu badawczego mającego na celu opracowanie metod wyznaczania charakterystyk energetycznych pomp i silników hydraulicznych obrotowych oraz zmodyfikowanych metod wyznaczania charakterystyk...

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• Water-lubricated bearings of ship propeller shafts - problems, experimental tests and theoretical investigations

  Publikacja

  • W. Litwin

  - Polish Maritime Research - Rok 2009

  W pracy przedstawiono problemy związane z projektowaniem, montażem i ekspolatcją smarowanych wodą łożysk okrętowych wałów głównych.Przedstawiono wyniki prowadzonych prac badawczych ekperymntalnych i obliczeń.

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Rok 2014

• The Quick Measure of a Nurbs Surface Curvature for Accurate Triangular Meshing

  Publikacja

  • A. Kniat

  - Polish Maritime Research - Rok 2014

  NURBS surfaces are the most widely used surfaces for three-dimensional models in CAD/CAE programs. As a model for FEM calculation is prepared with a CAD program it is inevitable to mesh it finally. There are many algorithms for meshing planar regions. Some of them may be used for meshing surfaces but it is necessary to take the curvature of the surface under consideration to avoid poor quality mesh. The mesh must be denser in the...

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Rok 2007

• The role of inland ports in integration of polish waterways with the european network

  Publikacja

  • T. Jarzębińska

  - Polish Maritime Research - Rok 2007

  Artykuł zawiera główne wnioski z badan, prowadzonych przez autorke w ramach projektu EUREKA. Przedstawiono krótki opis aktualnego stanu dróg wodnych w Polsce, uwarunkowania prawne żeglugi, znaczenie transportu wodnego w systemie transportowym kraju i najważniejsze porty śródlądowe. Opisano bariery rozwoju dród wodnych w Polsce. W artykule wykorzystano zdjęcia z dwóch rejsów, w ktorych autorka brała udzial w 2006 r.

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Rok 2011

• The semi-Markov model of energy state changes of the main marine internal combustion engine and method for evaluating its operation during ships voyage

  Publikacja

  • J. Girtler

  - Polish Maritime Research - Rok 2011

  Przedstawiono metodę oceny działania tłokowych silników spalinowych napędu głównego statków morskich, nazywanych silnikami głównymi, działających w różnych warunkach ich eksploatacji. Metoda ta umożliwia obliczenie wartości działania w wyniku zastosowania teorii procesów semimarkowskich i statystyki matematycznej. Znamienne jest to, że działanie wspomnianych silników spalinowych zostało przyrównane do wielkości fizycznej, którą...

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• Theoretical models of the torque of mechanical losses in the pump used in a hydrostatic drive

  Publikacja

  • Z. Paszota

  - Polish Maritime Research - Rok 2011

  Przedstawiono modele teoretyczne i matematyczne momentu strat mechanicznych występujących w pompie o stałej teoretycznej wydajności qPt na obrót wału (o stałej teoretycznej objętości roboczej VPt) bądź o zmiennej geometrycznej wydajności qPgv na obrót wału (o zmiennej geometrycznej objętości roboczej VPgv). Modele mają służyć badaniom laboratoryjnym i symulacyjnym strat energetycznych w pompie umożliwiającym ocenę sprawności energetycznej...

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Rok 2013

• The semi-Markov model of the process of appearance of sea-going ship propupsion system ability and inability states in application to determining the reliablity of these systems

  Publikacja

  • J. Girtler

  - Polish Maritime Research - Rok 2013

  The article presents possible application of the theory of semi-Markov processes in creating the eight-state model of the process of appearance of the propulsion systems ability and inability states on sea-going vessels performing transportation tasks in a relatively long operating time t (t → ∞). The model has been proved to be able to be successfully used for determining the reliability of the abovementioned systems. The probability...

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• Weldability of high strength steels in wet welding conditions

  Publikacja

  • D. Fydrych
  • J. Łabanowski
  • G. Rogalski

  - Polish Maritime Research - Rok 2013

  In this paper are characterized problems of high strength steel weldability in underwater wet welding conditions. Water as a welding environment intensifies action of unfavourable factors which influence susceptibility to cold cracking of welded steel joints. The susceptibility to cold cracking of S355J2G3 steel and S500M steel in wet conditions was experimentally estimated (by using Tekken test). It was concluded that the steels...

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Rok 2010

• Theoretical and mathematical models of the torque of mechanical losses in a hydraulic rotational motor for hydrostatic drive

  Publikacja

  • Z. Paszota

  - Polish Maritime Research - Rok 2010

  W pracy przedstawiono modele teoretyczne i matematyczne momentu strat mechanicznych występujących w silniku hydraulicznym obrotowym o stałej teoretycznej chłonności qMt silnika na obrót wału (o stałej teoretycznej objętości roboczej VMt silnika) i o zmiennej chłonności qMgv = bM qMt na obrót wału (o zmiennej geometrycznej objętości roboczej VMgv silnika). Modele mają służyć badaniom laboratoryjnym i symulacyjnym strat energetycznych...

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Rok 2023

• Toward Safe and Efficient Recovery of Gas Munitions Dumped at Sea

  Publikacja

  • L. Rowiński
  • T. H. Truong
  • P. Q. P. Nguyen

  - Polish Maritime Research - Rok 2023

  The proposal of a system for the safe recovery of unexploded ordnance (UXO), chemical weapons (CW) and chemicalwarfare agents (CWA) dumped at sea mainly after WWI and WWII is described in this work. The proposed solutionaddresses the tasks required to neutralise thousands of tons of dumped material and the currently available solutionsand proposed ideas. Requirements concerning the features of a recovery system are defined and...

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• Understanding Fuel Saving and Clean Fuel Strategies Towards Green Maritime

  Publikacja

  • V. N. Nguyen
  • K. Rudzki
  • M. Dzida
  • N. D. K. Pham
  • M. T. Pham
  • P. Q. P. Nguyen
  • P. N. Xuan

  - Polish Maritime Research - Rok 2023

  Due to recent emission-associated regulations imposed on marine fuel, ship owners have been forced to seek alternate fuels, in order to meet the new limits. The aim of achieving low-carbon shipping by the year 2050, has meant that alternative marine fuels, as well as various technological and operational initiatives, need to be taken into account. This article evaluates and examines recent clean fuels and novel clean technologies...

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• Use of the AHP Method for Preference Determination in Yacht Design

  Publikacja

  • J. SIERZPUTOWSKI

  - Polish Maritime Research - Rok 2023

  A sailing yacht is a human-centred product, the design of which revolves primarily around the wants and desires of the future owner. In most cases, these preferences are not measurable, such as a personal aesthetic feeling, or a need for comfort, speed, safety etc. The aims of this paper are to demonstrate that these preferences can be classified and represented numerically, and to show that they are correlated with the type...

• Use of the AHP Method for Preference Determination in Yacht Design

  Publikacja

  • J. Sierzputowski
  • A. Karczewski
  • P. Krata

  - Polish Maritime Research - Rok 2023

  A sailing yacht is a human-centred product, the design of which revolves primarily around the wants and desires of the future owner. In most cases, these preferences are not measurable, such as a personal aesthetic feeling, or a need for comfort, speed, safety etc. The aims of this paper are to demonstrate that these preferences can be classified and represented numerically, and to show that they are correlated with the type of...

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• USING ARTIFICIAL NEURAL NETWORKS FOR PREDICTING SHIP FUEL CONSUMPTION

  Publikacja

  • 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 - Rok 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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• Vessel Energy Requirement Prediction from Acceleration Stage Towing Tests on Scale Models

  Publikacja

  • K. Wrzask

  - Polish Maritime Research - Rok 2023

  One of the most crucial tasks for naval architects is computing the energy required to meet the ship’s operational needs. When predicting a ship’s energy requirements, a series of hull resistance tests on a scale model vessel is carried out in constant speed stages, while the acceleration stage measurements are ignored. Another important factor in seakeeping analysis is the ship’s hydrodynamic added mass. The second law of dynamics...

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Rok 2006

• Two design concepts of power plant for an inland waterways passenger ship intended for operating on Berlin-Kaliningrad route

  Publikacja

  • D. Bocheński
  • J. Rudnicki

  - Polish Maritime Research - Rok 2006

  Artykuł przedstawia dwa rozwiązania siłowni dwuczłonowego, śródlądowego statku pasażerskiego przeznaczonego na trasę Berlin-Kaliningrad. Przedstawiono projekty wstępne siłowni głównej umieszczonej na pchaczu oraz omówiono wymagania odnośnie siłowni pomocniczej umieszczonej w barce.

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• Waterjet propulsion of small-draught inland waterways ships

  Publikacja

  • Z. Domachowski
  • W. Próchnicki

  - Polish Maritime Research - Rok 2006

  Przedstawiono aspekty napędu strugowodnego z punktu widzenia jego zastosowania na statkach żeglugi śródlądowej, zarówno zalety jak i wady (ograniczenia). Oceniono możliwości takiego zastosowania napędu strugowodnego.

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Rok 2022

• Weather Routing System Architecture Using Onboard Data Collection and Route Optimisation

  Publikacja

  • J. Szłapczyńska
  • R. Vettor
  • R. Szłapczyński (dawniej: R. Szlapczynski)
  • M. Łącki
  • M. Życzkowski
  • M. A. Hinostroza
  • F. P. Santos
  • W. Tycholiz
  • C. G. Soares

  - Polish Maritime Research - Rok 2022

  This paper describes the architecture of a weather routing system consisting of two key elements: onboard monitoring and route optimiser sub-systems. The former is responsible for collecting various onboard measurements, such as current ship position or ship motion variables. These data, when gathered and processed, are then used for fine-tuning a ship model. The model, together with weather forecasts, is utilised by a multi-objective...

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