Rok 2019

• Application of Reverse Engineering Technology in Part Design for Shipbuilding Industry

  Publikacja

  • M. Deja
  • M. Dobrzyński
  • M. Rymkiewicz

  - Polish Maritime Research - Rok 2019

  In the shipbuilding industry, it is difficult to create CAD models of existing or prototype parts, especially with many freeform surfaces. The paper presents the creation of the CAD 3D model of a shipbuilding component with the application of the reverse engineering technology. Based on the data obtained from the digitization process, the component is reconstructed in point cloud processing programs and the CAD model is created....

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• Application of the Optimization Methods to the Search of Marine Propulsion Shafting Global Equilibrium in Running Condition

  Publikacja

  • A. Ursolov
  • Y. Batrak
  • W. Tarełko

  - Polish Maritime Research - Rok 2019

  Full film hydrodynamic lubrication of marine propulsion shafting journal bearings in running condition is discussed. Considerable computational difficulties in non-linear determining the quasi-static equilibrium of the shafting are highlighted. The approach using two optimization methods (the particle swarm method and the interior point method) in combination with the specially developed relaxation technique is proposed to overcome...

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• Application of Thermo-chemical Technologies for Conversion of Associated Gas in Diesel-Gas Turbine Installations for Oil and Gas Floating Units

  Publikacja

  • O. Cherednichenko
  • S. Serbin
  • M. Dzida

  - Polish Maritime Research - Rok 2019

  The paper considers the issue of thermo-chemical recovery of engine’s waste heat and its further use for steam conversion of the associated gas for oil and gas floating units. The characteristics of the associated gas are presented, and problems of its application in dual-fuel medium-speed internal combustion engines are discussed. Various variants of combined diesel-gas turbine power plant with thermo-chemical heat recovery are...

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• AUTONOMOUS PLATFORM TO PROTECT MARITIME INFRASTRUCTURE FACILITIES

  Publikacja

  • E. Kozaczka
  • G. Grelowska

  - Polish Maritime Research - Rok 2019

  Problems regarding the security of maritime infrastructure, especially harbours and offshore infrastructure, are currently a very hot topic. Due to these problems, there are some research projects in which the main goal is to decrease the gap and improve the methods of observation in the chosen area, for both in-air and underwater areas. The main goal of the paper is to show a new complex system for improving the security of the...

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• Blade Section Prpfile Array Lifting Surface Design Method for Marine Screw Propeller Blade

  Publikacja

  • P. Król

  - Polish Maritime Research - Rok 2019

  The lifting surface model is widely used in screw propeller design and analysis applications. It serves as a reliable tool for determination of the propeller blade mean line and pitch distribution. The main idea of this application was to determine the blade shape that would satisfy the kinematic boundary condition on its surface with the prescribed bound circulation distribution over it. In this paper a simplified lifting surface...

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• CFGFRPT Piles with a Circular Cross-Section and their Application in Offshore Structures

  Publikacja

  • E. Mieloszyk
  • M. Abramski
  • A. Milewska

  - Polish Maritime Research - Rok 2019

  The possibilities of using concrete piles in a polymer composite reinforced with glass fibres in offshore facilities were shown. Laboratory tests of CFGFRPT type piles compressed axially and in eccentric compression for the analysis of CFGFRPT piles were used. Methods of analysis of dynamic systems for mathematical modelling of the displacement of the hammer in the pile driving process were applied. The possibilities of combining...

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• Design of Jack-up Platform for 6 MW Wind Turbine: Parametric Analysis Based Dimensioning of Platform Legs

  Publikacja

  • P. Dymarski

  - Polish Maritime Research - Rok 2019

  The article presents the results of the research conducted within the framework of the project entitled WIND-TU-PLA (ERA-NET, MARTEC II), the general aim of which was to design and analyse supporting structures for wind turbines intended for operation on the South Baltic area. The research part described in the article aimed at developing a preliminary design for a jack-up platform which can operate on water areas with depth of...

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• Diagnostic Model of Crankshaft Seals

  Publikacja

  • P. Bzura

  - Polish Maritime Research - Rok 2019

  T he paper presents a research stand being a diagnostic model of radial lip seals used, among others, on crankshafts of piston combustion engines in order to identify the correctness of their operation. The possibility of determining the technical condition of lip seals on the basis of the proposed coefficient of correctness of operation has been described. T he basic features of seals influencing their correctness of...

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• ENERGY EFFICIENT SMALL INLAND PASSENGER SHUTTLE FERRY WITH HYBRID PROPULSION - CONCEPT DESIGN, CALCULATIONS AND MODEL TESTS

  Publikacja

  • M. Kunicka
  • W. Litwin

  - Polish Maritime Research - Rok 2019

  In recent years, there has been a significant development in “green” and energy efficient propulsion systems, which fits into the general trend of environmentally friendly “green shipping”. The pursued goal is to construct a safe passenger ship that is low in energy demand and equipped with a highly energy efficient, emission-free propulsion system. The paper presents main problems encountered by designers of a small, hybrid-powered...

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• Energy Loss Coefficients ki in a Displacement Pump and Hydraulic Motor used in Hydrostatic Drives

  Publikacja

  • A. Maczyszyn

  - Polish Maritime Research - Rok 2019

  The article aims at defining and analysing the energy loss coefficients in design solutions of rotating displacement machines, with a piston machine as an example. The energy losses observed in these machines include mechanical loss, volumetric loss, and pressure loss. The scale and relations between these losses in different machines depend on machine design and manufacturing quality, and on operating parameters. The operating...

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• Framework of an Evolutionary Multi-Objective Optimisation Method for Planning a Safe Trajectory for a Marine Autonomous Surface Ship

  Publikacja

  • R. Szłapczyński
  • M. H. Ghaemi (dawniej: M. Ghaemi)

  - Polish Maritime Research - Rok 2019

  This paper represents the first stage of research into a multi-objective method of planning safe trajectories for marine autonomous surface ships (MASSs) involved in encounter situations. Our method applies an evolutionary multi-objective optimisation (EMO) approach to pursue three objectives: minimisation of the risk of collision, minimisation of fuel consumption due to collision avoidance manoeuvres, and minimisation of the extra...

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• Generation and Propagation of Nonlinear Waves in a Towing Tank

  Publikacja

  • M. Drzewiecki
  • W. Sulisz

  - Polish Maritime Research - Rok 2019

  The paper presents the results of the research focused on linear and nonlinear wave generation and propagation in a deepwater towing tank equipped with a single flap-type wavemaker of variable draft. The problem of wave generation and propagation has been theoretically formulated and solved by applying an analytical method; linear and nonlinear solutions were obtained. The linear solution has been verified experimentally. The...

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• Hybrid Finite Element Method Development for Offshore Structures’ Calculation with the Implementation of Industry Standards

  Publikacja

  • J. Łubiński
  • H. Olszewski

  - Polish Maritime Research - Rok 2019

  In the design process of offshore steel structures, it is typical to employ commercial calculation codes in which simulation and evaluation of results are performed on the basis of the available standards (e.g. API, DNV, Lloyds). The modeling and solution rely on finite element methods and cover the simulation of the structure’s properties along with the influence of the marine environment – sea currents, wave and wind loading,...

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• Hydraulic analysis of causes of washout of Gdynia-Orłowo seashore during the flood in the Kacza river estuary

  Publikacja

  • M. Szydłowski

  - Polish Maritime Research - Rok 2019

  In July 2016 in the Three-city agglomeration a rainfall episode of over a day duration and 150 mm summary rainfall height, occurred. This situation, extreme as for Polish conditions, caused significant freshets in rivers and streams running into Gdansk Bay, the Baltic Sea, and serving as collectors of rainfall waters for the sea-coast towns. In many areas of the Three-city flood phenomena and overflows took place. The flood also...

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• Injury Prediction Models for Onshore Road Network Development

  Publikacja

  • W. Kustra
  • J. Żukowska
  • M. Budzyński
  • K. Jamroz

  - Polish Maritime Research - Rok 2019

  Integrating different modes of transport (road, rail, air and water) is important for port cities. To accommodate this need, new transport hubs must be built such as airports or sea ports. If ports are to grow, they must be accessible, a feature which is best achieved by building new roads, including fast roads. Poland must develop a network of fast roads that will provide good access to ports. What is equally important is to upgrade...

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• Investigation of the Combustion Processes in the Gas Turbine Module of an FPSO Operating on Associated Gas Conversion Products

  Publikacja

  • O. Cherednichenko
  • S. Serbin
  • M. Dzida

  - Polish Maritime Research - Rok 2019

  In this paper, we consider the issue of thermo-chemical heat recovery of waste heat from gas turbine engines for the steam conversion of associated gas for offshore vessels. Current trends in the development of offshore infrastructure are identified, and the composition of power plants for mobile offshore drilling units and FPSO vessels is analyzed. We present the results of a comparison of power-to-volume ratio, power-to-weight...

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• Model Predictive Super-Twisting Sliding Mode Control for An Autonomous Surface Vehicle

  Publikacja

  • H. Nejatbakhsh Esfahani
  • R. Szłapczyński

  - Polish Maritime Research - Rok 2019

  This paper presents a new robust Model Predictive Control (MPC) algorithm for trajectory tracking of an Autonomous Surface Vehicle (ASV) in presence of the time-varying external disturbances including winds, waves and ocean currents as well as dynamical uncertainties. For fulfilling the robustness property, a sliding mode control-based procedure for designing of MPC and a super-twisting term are adopted. The MPC algorithm has been...

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• NEW CONCEPT OF HYBRID PROPULSION WITH HYDROSTATIC GEAR FOR INLAND WATER TRANSPORT

  Publikacja

  • D. Piątek

  - Polish Maritime Research - Rok 2019

  The article presents the development of author’s concept of a diesel/hydraulic propulsion system for inland watercraft. Due to specific nature of vessel navigation on rivers, classical propulsion systems with shaft lines can be effectively replaced by systems with hydraulic power transmission. A solution is also presented of a hybrid design with extra electric port having the form of a pumping system driven from a battery of accumulators....

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• NEW DESIGNS OF CENTRIFUGAL MAGNETIC FLUID SEALS FOR ROTATING SHAFTS IN MARINE TECHNOLOGY

  Publikacja

  • L. Matuszewski

  - Polish Maritime Research - Rok 2019

  The centrifugal magnetic fluid seals have important advantage over the conventional centrifugal seals. They maintain very good sealing capacity at static, medium and high speeds of shaft rotation, with the increased seal lifetime, and minimum torque and static friction. These seals are particularly useful in cases when the angular shaft velocity varies and sometimes decreases to nearly or exactly zero, such as in flywheel applications,...

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• Numerical Analysis of an Impact of Planned Location of Sewage Discharge on Natura 2000 Areas – The Dead Vistula Region Case Study

  Publikacja

  • P. Zima

  - Polish Maritime Research - Rok 2019

  This article presents results of an analysis of impact of a designed discharge of contaminated water into the Dead Vistula (Wisła Martwa) in the region of the Isthmus (Przesmyk) with the aim of determination of a possible effect of the pollution onto protected areas of Natura 2000 (bird habitats and sites, especially the Bird Paradise – Ptasi Raj) nature reserve. The analysis was conducted on the basis of the two-dimensional modelling...

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• On some problems in determining tensile parameters of concrete model from size effect tests

  Publikacja

  • I. Marzec
  • J. Bobiński

  - Polish Maritime Research - Rok 2019

  The paper presents results of numerical simulations of size effect phenomenon in concrete specimens. The behaviour of in-plane geometrically similar notched and unnotched beams under three-point bending is investigated. In total 18 beams are analysed. Concrete beams of four different sizes and five different notch to depth ratios are simulated. Two methods are applied to describe cracks. First, an elasto-plastic constitutive law...

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• Parametric method applicable in calculating breakout force and time for lifting axisymmetric objects from seabed.

  Publikacja

  • J. Michalski

  - Polish Maritime Research - Rok 2019

  The issue of calculating parameters for lifting objects of axisymmetric shapes from the seabed is studied. The article presents the results of numerical simulation examination of the equation formulated by Foda for the force needed to extricate the object from the seabed depending on soil and water parameters, extrication speed, and object diameter. The simulations were performed within the range of parameters characteristic for...

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• Polish DGPS System: 1995–2017 – Study of Positioning Accuracy

  Publikacja

  • C. Specht
  • L. Smolarek
  • J. Pawelski
  • M. Specht
  • P. S. Dąbrowski

  - Polish Maritime Research - Rok 2019

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• REVIEW OF WEATHER FORECAST SERVICES FOR SHIP ROUTING PURPOSES

  Publikacja

  • M. Życzkowski
  • J. Szłapczyńska
  • R. Szłapczyński

  - Polish Maritime Research - Rok 2019

  Weather data is nowadays used in a variety of navigational and ocean engineering research problems: from the obvious ones like voyage planning and routing of sea-going vessels, through the analysis of stability-related phenomena, to detailed modelling of ships’ manoeuvrability for collision avoidance purposes. Apart from that, weather forecasts are essential for passenger cruises and fishing vessels that want to avoid the risk...

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• Robust Model Predictive Control for Autonomous Underwater Vehicle – Manipulator System with Fuzzy Compensator

  Publikacja

  • H. Nejatbakhsh Esfahani

  - Polish Maritime Research - Rok 2019

  This paper proposes an improved Model Predictive Control (MPC) approach including a fuzzy compensator in order to track desired trajectories of autonomous Underwater Vehicle Manipulator Systems (UVMS). The tracking performance can be affected by robot dynamical model uncertainties and applied external disturbances. Nevertheless, the MPC as a known proficient nonlinear control approach should be improved by the uncertainty estimator...

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• Robust Model Predictive Control for Autonomous Underwater Vehicle–Manipulator System with Fuzzy Compensator

  Publikacja

  • H. Nejatbakhsh Esfahani

  - Polish Maritime Research - Rok 2019

  This paper proposes an improved Model Predictive Control (MPC) approach including a fuzzy compensator in order totrack desired trajectories of autonomous Underwater Vehicle Manipulator Systems (UVMS). The tracking performancecan be affected by robot dynamical model uncertainties and applied external disturbances. Nevertheless, the MPCas a known proficient nonlinear control approach should be improved by the...

• Selected Issues of Hybrid Outboard Motors

  Publikacja

  • W. Leśniewski

  - Polish Maritime Research - Rok 2019

  The aim of the research reported in the article was designing a hybrid drive system based on an outboard internal combustion engine offered by a selected producer and testing its operating characteristics. The article presents different designs of this type of drive which can be found in the literature and are available in the market. The designed hybrid outboard drive system was tested both on the laboratory test rig and in real...

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• Selected Problems of Experimental Testing Marine Stern Tube Bearings

  Publikacja

  • A. Barszczewska
  • E. Wojtowicz (dawniej: E. Piątkowska)
  • W. Litwin

  - Polish Maritime Research - Rok 2019

  This paper presents typical methods for conducting experimental tests on main shaft slide bearings. There are described their possible testing capabilities, advantages, drawbacks and limitations. Various testing methods were analyzed to find a solution able of providing a wide range of possible investigations at possibly acceptable limitations.

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• SPECTRAL DYNAMIC ANALYSIS OF A STATIONARY JACK-UP PLATFORM

  Publikacja

  • B. Rozmarynowski

  - Polish Maritime Research - Rok 2019

  The paper refers to the dynamic short-term response analysis of the Baltic steel drilling platform (see Fig.2) in a random sea-state represented by one-dimensional wave spectrum proposed by Striekalov and Massel and it is recommended for the Baltic Sea area. The Baltic drilling platform is a jack-up type platform for the exploration and exploitation of oil under the Baltic Sea. The analysis presented deals with the stationary...

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• Stability Analysis of the Floating Offshore Wind Turbine Support Structure of Cell Spar Type During its Installation

  Publikacja

  • P. Dymarski
  • C. Dymarski
  • E. Ciba

  - Polish Maritime Research - Rok 2019

  The article presents the results of selected works related to the wider subject of the research conducted at the Faculty of Ocean Engineering and Ship Technology of the Gdansk University of Technology, which concerns design and technology of construction, towing, and settlement on the seabed, or anchoring, of supporting structures for offshore wind farms. As a result of this research, several designs of this type of objects were...

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• Structural Reliability Assessment Of Corroded Tanker Ship Based On Experimentally Estimated Ultimate Strength

  Publikacja

  • K. Wołoszyk
  • Y. Garbatov

  - Polish Maritime Research - Rok 2019

  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...

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• The Analysis of Overall Ship Fuel Consumption in Acceleration Manoeuvre using Hull-Propeller-Engine Interaction Principles and Governor Features

  Publikacja

  • H. Zeraatgar
  • M. H. Ghaemi (dawniej: M. Ghaemi)

  - Polish Maritime Research - Rok 2019

  The problem of reduction of greenhouse gas emissions in shipping is currently addressed by many research works and related industries. There are many existing and visionary technologies and ideas, which are conceptually defined or practically realised. This goal can be achieved in different ways, and reducing fuel consumption is one of the major methods. In these circumstances, the aim of this study is to analyse the possibility...

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• THE APPLICATION OF PHENOMENOLOGICAL METHODOLOGY FOR DESIGNING PILE FOUNDATION IN PORT STRUCTURES

  Publikacja

  • P. Więcławski

  - Polish Maritime Research - Rok 2019

  It is of utmost importance in the design process that a suitable, safe and concurrently economic solution be chosen. Issues connected with foundations require adopting a special approach. Soil is a composite medium, and it is essential to describe as precisely as possible the interaction taking place between the subgrade and the structure. There are many design methods of pile foundation that are based on in-situ test of soils....

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• 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 2018

• 3D Object Shape Reconstruction from Underwater Multibeam Data and Over Ground Lidar Scanning

  Publikacja

  • M. Kulawiak
  • Z. Łubniewski

  - Polish Maritime Research - Rok 2018

  The technologies of sonar and laser scanning are an efficient and widely used source of spatial information with regards to underwater and over ground environment respectively. The measurement data are usually available in the form of groups of separate points located irregularly in three-dimensional space, known as point clouds. This data model has known disadvantages, therefore in many applications a different form of representation,...

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• A CONCEPT OF DETERMINING THE RELATION BETWEEN LOAD AND WEAR OF TRIBOLOGICAL SYSTEMS OF SHIP MAIN SELF-IGNITION ENGINES BY USING PROBABILISTIC APPROACH PROBABILISTIC APPROACH

  Publikacja

  • J. Girtler

  - Polish Maritime Research - Rok 2018

  This paper presents a proposal of simultaneous consideration of load and wear associated with it , of tribological systems of ship main engines (intended for ship propulsion) . Based on results of investigations it was assumed that both the load Q (i.e. a cause of wear ) and the wear Z (i.e. an effect of load occurrence) considered in a given time t(0 ≤ t ≤ t) are random variables Qt and Zt, respectively. There was characterized...

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• A Framework of A Ship Domain-Based Near-Miss Detection Method Using Mamdani Neuro-Fuzzy Classification

  Publikacja

  • T. Niksa-Rynkiewicz
  • R. Szłapczyński

  - Polish Maritime Research - Rok 2018

  Safety analysis of navigation over a given area may cover application of various risk measures for ship collisions. One of them is percentage of the so called near- miss situations (potential collision situations). In this article a method of automatic detection of such situations based on the data from Automatic Identification System (AIS), is proposed. The method utilizes input parameters such as: collision risk measure based...

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• A new approach of coastal cliff monitoring using Mobile Laser Scanning

  Publikacja

  • R. Ossowski
  • P. Tysiąc

  - Polish Maritime Research - Rok 2018

  The article proposes a new approach of coastal cliff monitoring which bases on a new comprehensive monitoring system, being a combination of mobile scanning from the sea with the geotechnical stability analysis. Mobile laser scanning is an innovative solution for 3D data collection which allows the monitored object geometry to be precisely measured, thus providing opportunities for series of analyses contributing to the development...

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• Application of Rapid Prototyping technology in the manufacturing of turbine blade with small diameter holes

  Publikacja

  • M. Deja
  • M. Dobrzyński
  • P. Flaszyński
  • J. Haras
  • D. Zieliński

  - Polish Maritime Research - Rok 2018

  The article presents the possibilities of using Rapid Prototyping (RP) technology in the manufacturing of turbine blades with small diameter holes. The object under investigation was gas turbine blade with small diameter cooling holes and holes for generating longitudinal vortices. A turbine blade model was produced by means of Direct Metal Laser Sintering (DMLS) technology and subsequently validated in terms of detection and accuracy...

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• APPLICATION OF VORTEX FLOW MODEL IN PROPELLER-STATOR SYSTEM DESIGN AND ANALYSIS

  Publikacja

  • P. Król
  • T. Bugalski

  - Polish Maritime Research - Rok 2018

  The paper covers basics of the vortex model used for propeller-stator systems. The outline of the design algorithm is given and the results of its application are shown. The designed propeller-stator system was the subject of model tests run at the CTO model basin and cavitation tunnel. Stator’s influence on the delivered power required by the propeller and its revolution rate has been examined by conducting self-propulsion...

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• Automatic Watercraft Recognition and Identification on Water Areas Covered by Video Monitoring as Extension for Sea and River Traffic Supervision Systems

  Publikacja

  • N. Wawrzyniak
  • A. Stateczny

  - Polish Maritime Research - Rok 2018

  The article presents the watercraft recognition and identification system as an extension for the presently used visual water area monitoring systems, such as VTS (Vessel Traffic Service) or RIS (River Information Service). The watercraft identification systems (AIS - Automatic Identification Systems) which are presently used in both sea and inland navigation require purchase and installation of relatively expensive transceivers...

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• COLD CRACKING OF S460N STEEL WELDED IN WATER ENVIRONMENT

  Publikacja

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

  - Polish Maritime Research - Rok 2018

  This paper shows results of weldability testing of fine-grained high -strength low- alloy S460N steel welded in water environment by covered electrodes. The tests were carried out by using the CTS test specimens with fillet welds. Four specimens were welded under water and one specimen in air. Welded joints were subjected to non-destructive visual and penetration tests. The accepted joints were then subjected to macroscopic and...

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• Comparative analysis of thermodynamic cycles of selected nuclear ship power plants with high-temperature helium-cooled nuclear reactor

  Publikacja

  • N. Szewczuk-Krypa
  • A. Milewska
  • J. Głuch

  - Polish Maritime Research - Rok 2018

  This paper presents a comparative analysis of thermodynamic cycles of two ship power plant systems with a high-temperature helium- cooled nuclear reactor. The first of them is a gas system with recuperator , in which classical gas chamber is substituted for a HTGR reactor (High Temperature Gas-cooled Reactor) . The second of the considered cycles is a combined gas-steam system where working medium flux from gas turbine outlet...

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• Comparison analysis of selected nuclear power plants supplied with helium from high-temperature gas-cooled reactor

  Publikacja

  • N. Szewczuk-Krypa
  • M. Drosińska-Komor
  • J. Głuch
  • Ł. Breńkacz

  - Polish Maritime Research - Rok 2018

  The article presents results of efficiency calculations for two 560 MW nuclear cycles with high-temperature gas-cooled reactor (HTGR). An assumption was made that systems of this type can be used in so-called marine nuclear power plants. The first analysed system is the nuclear steam power plant. For the steam cycle, the efficiency calculations were performed with the code DIAGAR, which is dedicated for analysing this type of systems....

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• Comparison of selected parametric methods for prediction of inland waterways ship hull resistance in towing tank test

  Publikacja

  • A. Karczewski
  • J. Kozak

  - Polish Maritime Research - Rok 2018

  In the paper selected approximate methods for calculation of inland waterways ship resistance and their verification by towing tests, compared on the example of a small urban ferry, are presented. The test results are made for both the bare hull and the hull with appendages (skeg, azimuthal propeller). Significant differences between results of the theoretical methods and experimental ones, especially in the case of the model with...

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• Degradation of the Concrete Railway Track Bed Located in the Vicinity of the Loading Wharf

  Publikacja

  • M. Niedostatkiewicz

  - Polish Maritime Research - Rok 2018

  The following article describes the damages of the concrete railway track bed at the place of unloading petroleum products located in the immediate vicinity of the cargo berth. The concrete of the track bed has been a subject to degradation as a result of many years of exploitation resulting, inter alia, in its cyclical flooding of petroleum products during the unloading and loading of rail tankers. Repairs carried out in the previous...

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• Dynamically positioned ship steering making use of backstepping method and artificial neural networks

  Publikacja

  • A. Witkowska
  • T. Niksa-Rynkiewicz

  - Polish Maritime Research - Rok 2018

  The article discusses the issue of designing a dynamic ship positioning system making use of the adaptive vectorial backstepping method and RBF type arti cial neural networks. In the article, the backstepping controller is used to determine control laws and neural network weight adaptation laws. e arti cial neural network is applied at each time instant to approximate nonlinear functions containing parametric uncertainties....

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• ECONOMICAL AND SAFE METHOD OF GRANULAR MATERIAL STORAGE IN SILOS IN OFFSHORE PORT TERMINALS

  Publikacja

  • M. Sondej
  • C. Ratnayake
  • M. Wójcik

  - Polish Maritime Research - Rok 2018

  The article discusses issues related with storage of granular materials in silos made of corrugated sheets and reinforced with vertical ribs. Advantages and disadvantages of these structures are named, and typical technological solutions used by largest silo producers are presented. Moreover, basic assumptions of Eurocode 3 are discussed in the context of determining the buckling load capacity of a ribbed jacket. Alternative methods...

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• ENERGY ANALYSIS OF PROPULSION SHAFT FATIGUE PROCESS IN ROTATING MECHANICAL SYSTEM PART I TESTING SIGNIFICANCE OF INFLUENCE OF SHAFT MATERIAL FATIGUE EXCITATION PARAMETERS

  Publikacja

  • Z. Korczewski
  • K. M. Marszałkowski (dawniej: K. Marszałkowski)

  - Polish Maritime Research - Rok 2018

  The article discusses the problem of mathematical modelling of energy conversion processes in a rotating mechanical system for the purpose of identifying fatigue states of propulsion shafts in this system. A simplified physical model of the analysed system, constructed in an appropriate scale, has made the basis for the experimental research. The research programme took into consideration mechanical fatigue excitation of the model...

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