Rok 2024

• An Innovative Floating System with a Savonius Rotor as a Horizontal-Axis Wind Turbine

  Publikacja

  • J. Grzelak
  • L. G. Carrillo
  • J. Nakielski
  • M. Piotrowicz
  • K. Doerffer

  - Polish Maritime Research - Rok 2024

  In this project, an innovative wind turbine was designed for a floating plant. A large Savonius rotor was replaced with a double-rotor wind turbine implemented as a horizontal-axis turbine. This double rotor was positioned on the tip of a thrust plate and fixed to the deck of a catamaran. Simple 2D numerical simulations were performed to confirm the effectiveness of the concept. An analysis of the floating system configuration...

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• Evaluation of a Small Inland Ferry’s Energy Requirements from the Acceleration Stage of Towing Tank Model Tests

  Publikacja

  • M. Kunicka
  • K. Wrzask
  • W. Litwin
  • M. Grygorowicz
  • H. Zeratgaar

  - Polish Maritime Research - Rok 2024

  Computing the power required to meet a ship’s operational needs is one of the most important tasks in naval design. The power required to propel a vessel is directly related to the resistance the hull experiences as it moves through the water. The conventional method of determining a ship’s resistance involves towing tank tests of ship models at a fixed speed; however, for short-range vessels, where constant speed is not the primary...

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• Investigating Fuel Injection Strategies to Enhance Ship Energy Efficiency in Wave Conditions

  Publikacja

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

  - Polish Maritime Research - Rok 2024

  The prediction of fuel consumption and resulting transportation costs is a crucial stage in ship design, particularly for conditions involving motion in waves. This study investigates the real-time fuel consumption of a container ship when sailing in waves. The overall ship performance is evaluated using a novel non-linear coupled hull-engine-propeller interaction model. A series of towing tank experiments for hull resistance in...

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• Optimisation of the Energy Consumption of a Small Passenger Ferry with Hybrid Propulsion

  Publikacja

  • M. Kunicka

  - Polish Maritime Research - Rok 2024

  The main goal in the design phase is to create a safe ship with a very efficient (and preferably zero-emission) propulsion system. To obtain such ships, new concepts are being developed for both propulsion systems and individual components. The choice of a propulsion system is not straightforward. To optimise the selection of the propulsion system, it is valuable to optimise the energy demand of this unit, which can be done by...

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• Simulation-Based Approach to a More Efficient Handling Strategy for a Container Terminal Storage Yard: Case Study of the Baltic Hub Container Terminal

  Publikacja

  • K. Moszyk
  • M. Deja
  • O. Janowczyk

  - Polish Maritime Research - Rok 2024

  The primary objective of this research was to implement a more efficient handling strategy in the container terminal storage yard at the Baltic Hub Container Terminal (BHCT). Following an analysis of the current logistics system associated with starboard-side mooring, an attempt was made to shift the mooring to the port side. Two routing strategies corresponding to the analysed mooring operations were tested using a developed...

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• Simulation-Based Approach to a More Efficient Handling Strategy for a Container Terminal Storage Yard: Case Study of the Baltic Hub Container Terminal

  Publikacja

  • K. Moszyk
  • O. Janowczyk
  • M. Deja

  - Polish Maritime Research - Rok 2024

  The primary objective of this research was to implement a more efficient handling strategy in the container terminal storage yard at the Baltic Hub Container Terminal (BHCT). Following an analysis of the current logistics system associated with starboard-side mooring, an attempt was made to shift the mooring to the port side. Two routing strategies corresponding to the analysed mooring operations were tested using a developed model....

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• Zero-Emissions, Off-grid, Autonomous Houseboat – a Case Study of Selected Locations in Europe

  Publikacja

  • J. Gorzka
  • A. Karczewski
  • W. Litwin
  • K. Matej-Łukowicz
  • N. Nawrot
  • L. Nyka
  • Ł. Piątek

  - Polish Maritime Research - Rok 2024

  The aim of this study was to assess the feasibility of creating a prototype of a self-sufficient houseboat that is capable of prolonged independence from power grids and freshwater sources. In this design, electricity demand is met by a photovoltaic installation, and the energy is stored in batteries. Fresh water for living needs may be obtained from many sources, depending on the environmental conditions, such as through purifying...

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Rok 2023

• A Generative Approach to Hull Design for a Small Watercraft

  Publikacja

  • A. Karczewski
  • J. Kozak

  - Polish Maritime Research - Rok 2023

  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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• Analysis of the Environmental Impact of the Hull Construction of a Small Vessel Based on LCA

  Publikacja

  • J. Nakielski

  - Polish Maritime Research - Rok 2023

  In recent years, issues related to the impact of human activity on the natural environment have become pressing, and the challenge of global warming necessitates immediate action. To support environmental protection efforts, it has become imperative to adopt a broader perspective when evaluating various products and systems. A valuable tool for such assessments is a life cycle assessment (LCA), which enables a comprehensive analysis...

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• COMMENTS ON EXISTING ANALYTICAL SOLUTIONS TO THE WAVE-INDUCED CYCLIC RESPONSE OF A POROUS SEABED OF INFINITE THICKNESS

  Publikacja

  • W. Magda

  - Polish Maritime Research - Rok 2023

  This paper deals with the wave-induced cyclic response of a porous seabed (by means of oscillating parameters: pore-fluid pressure, soil displacement components, effective normal stress and shear stress components) due to a surface sinusoidal water-wave propagating over a seabed of infinite thickness. The main existing analytical solutions to the governing problem are critically discussed, pointing out their meaningful errors and...

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• Design of an Autonomous IoT Node Powered by a Perovskite-Based Wave Energy Converter

  Publikacja

  • M. Drzewiecki
  • J. Guziński

  - Polish Maritime Research - Rok 2023

  This paper presents the results of experimental research focused on wave energy harvesting and its conversion to power Internet of Things (IoT) devices. The harvesting and conversion process was performed using a wave energy converter (WEC) consisting of a lead zirconate titanate piezoelectric ceramic perovskite material and a prototype power electronic circuit. The designed WEC was considered as a power supply for an end node...

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• Diagnostic Analysis of Exhaust Gas with A Quick-Changing Temperature from a Marine Diesel Engine Part II / Two Factor Analysis

  Publikacja

  • P. Puzdrowska

  - Polish Maritime Research - Rok 2023

  The article presents a continuation of research carried out to determine the effect of input parameters (changes in engine structure parameters) on selected output parameters (diagnostic measures), based on quickly changing exhaust gas temperature. A method of determining the simultaneous influence of two input factors (the structure parameter and the engine load) on one output factor was presented, as well as an evaluation...

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• DYNAMIC POSITIONING CAPABILITY ASSESSMENT BASED ON OPTIMAL THRUST ALLOCATION

  Publikacja

  • A. Piekło
  • A. Witkowska
  • T. Zubowicz

  - Polish Maritime Research - Rok 2023

  The article presents an efficient method of optimal thrust allocation over the actuators in a dynamically positioned ship, according to the DNV-ST-0111 standard, Level 1. The optimisation task is approximated to a convex problem with linear constraints and mathematically formulated as quadratic programming. The case study is being used to illustrate the use of the proposed approach in assessing the DP capability of a rescue ship....

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• EVALUATION OF THE USE OF M2M-TYPE NB-IoT AND LTE TECHNOLOGIES FOR MARITIME COMMUNICATION SYSTEMS

  Publikacja

  • S. Gajewski
  • A. Czapiewska
  • M. Gajewska

  - Polish Maritime Research - Rok 2023

  The development of IoT (the Internet of Things) wireless transmission opens a new era in communication systems. In the next years, the development and implementation of IoT systems will be very dynamic. It can be seen that the solutions of LTE – NB-IoT (Long Term Evolution – Narrowband IoT) transmission devices are implemented in a wide range of terrestrial solutions, e.g. smart grids. This paper aims to analyse the possibility...

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• GUIDED WAVES IN SHIP STRUCTURAL HEALTH MONITORING – A FEASIBILITY STUDY

  Publikacja

  • E. Roch
  • B. Zima
  • K. Wołoszyk
  • Y. Garbatov

  - Polish Maritime Research - Rok 2023

  Ships and offshore structures operate in a severe corrosion degradation environment and face difficulty in providing long- lasting corrosion protection. The Classification Societies recommend regular thickness measurements leading to structural component replacements, to ensure structural integrity during service life. The measurements are usually performed using ultrasonic thickness gauges and such an approach requires multiple...

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• HEALTH MONITORING OF A COMPRESSION IGNITION ENGINE FED WITH DIFFERENT LOW-SULPHUR MARINE FUELS BY ENDOSCOPIC IMAGE PROCESSING AND ANALYSIS

  Publikacja

  • Z. Korczewski

  - Polish Maritime Research - Rok 2023

  This article characterises the methodology for the endoscopic testing of a laboratory diesel engine used for testing marine fuels. The ‘Shadow’ measurement method used in the XLG3 type EVEREST digital endoscope, for quantitative and qualitative identification of detected surface defects, was approximated. Representative endoscopic images of the elements limiting the working space of the research engine are demonstrated, having...

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• Human Resource Management Digitalisation in Multidisciplinary Ship Design Companies

  Publikacja

  • P. Bilon
  • W. Litwin

  - Polish Maritime Research - Rok 2023

  The digitalisation in the ship design sector is currently applied to the design process itself and is well defined, partially standardised and practically implemented by both independent design companies and the design departments of shipyards. The situation is similar in other sectors of engineering. However, the requirements for the digitalisation of other processes in design and engineering companies have not previously been...

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• Investigation of the Efficiency of a Dual-Fuel Gas Turbine Combustion Chamber with a Plasma‒Chemical Element

  Publikacja

  • S. Serbin
  • B. Diasamidze
  • M. Dzida
  • D. Chen

  - Polish Maritime Research - Rok 2023

  The study is devoted to the possibility of increasing the efficiency of the working process in dual-fuel combustion chambers of gas turbine engines for FPSO vessels. For the first time, it is proposed to use the advantages of plasma‒chemical intensification of the combustion of hydrocarbon fuels in the dual-fuel combustion chambers, which can simultaneously operate on gaseous and liquid fuels. A design scheme of a combustion chamber...

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• Management Strategy for Seaports Aspiring to Green Logistical Goals of IMO: Technology and Policy Solutions

  Publikacja

  • T. T. Le
  • H. P. Nguyen
  • K. Rudzki
  • L. Rowiński
  • V. D. Bui
  • T. H. Truong
  • H. C. Le
  • N. D. K. Pham

  - Polish Maritime Research - Rok 2023

  Recently, because of serious global challenges including the consumption of energy and climate change, there has been an increase in interest in the environmental effect of port operations and expansion. More interestingly, a strategic tendency in seaport advancement has been to manage the seaport system using a model which balances environmental volatility and economic development demands. An energy efficient management system...

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• Quantumness in Diagnostics of Marine Internal Combustion Engines and Other Ship Power Plant Machines

  Publikacja

  • J. Rudnicki
  • J. Girtler

  - Polish Maritime Research - Rok 2023

  The article provides proof that the diagnostics of marine internal combustion engines and other ship power plant machines should take into account the randomness and unpredictability of certain events, such as wear, damage, the variations of mechanical and thermal loads, etc., which take place during machine operation. In the article, the energy E, like the other forms (methods) that it can be converted into (heat and work), is...

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• Reduction of CO2 Emissions from Offshore Combined Cycle Diesel Engine-Steam Turbine Power Plant Powered by Alternative Fuels

  Publikacja

  • W. Olszewski
  • M. Dzida
  • V. G. Nguyen
  • D. N. Cao

  - Polish Maritime Research - Rok 2023

  Diverse forms of environmental pollution arise with the introduction of materials or energy that exert adverse effects on human health, climate patterns, ecosystems, and beyond. Rigorous emission regulations for gases resulting from fuel combustion are being enforced by the European Union and the International Maritime Organization (IMO), directed at maritime sectors to mitigate emissions of SOx, NOx, and CO2. The IMO envisions...

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• ROLE OF GREEN LOGISTICS IN THE CONSTRUCTION OF SUSTAINABLE SUPPLY CHAINS

  Publikacja

  • N. D. K. Pham
  • G. H. Dinh
  • H. T. Pham
  • J. Kozak
  • P. N. Hoang

  - Polish Maritime Research - Rok 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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• 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 2022

• 50’ Sail Catamaran with Hybrid Propulsion, Design, Theoretical and Experimental Studies

  Publikacja

  • W. Litwin
  • D. Piątek
  • W. Leśniewski
  • K. M. Marszałkowski (dawniej: K. Marszałkowski)

  - Polish Maritime Research - Rok 2022

  The development of modern lithium batteries and propulsion systems now allows the use of complex propulsion systems for vessels of various sizes. As part of the research and implementation project, a parallel hybrid drive system was designed, built and then tested in the laboratory. The experimental studies conducted allowed for the measurements of power, fuel consumption and electric power distribution in various operating modes...

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• An innovative method of measuring the extension of the piston rod in hydraulic cylinders, especially large ones used in the shipbuilding and offshore industry

  Publikacja

  • C. Dymarski
  • P. Dymarski
  • P. Grymajło

  - Polish Maritime Research - Rok 2022

  The article presents the results of selected works related to the wider subject of research conducted at the Faculty of Mechanical Engineering and Shipbuilding at the Gdańsk University of Technology, regarding designing various on board devices with hydraulic drive for ships and other offshore facilities. One of the commonly used these mechanisms are hydraulic actuators with the measurement of the piston rod extension. The issue...

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• Analysis of the Hydrodynamic Properties of the 3-Column Spar Platform for Offshore Wind Turbines

  Publikacja

  • E. Ciba
  • P. Dymarski
  • M. Grygorowicz

  - Polish Maritime Research - Rok 2022

  The article presents a design of a floating platform for offshore wind turbines. The concept is a modification of the Spar design and consists of three variable section columns connected to each other by a ballast tank in the lower part of the platform. This solution makes it possible to influence the position of the centre of buoyancy and the centre of mass of the structure. Compared to the classic Spar platform structure, the...

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• Application of the corrosion tester in corrosion tests using the acoustic emission method.

  Publikacja

  • K. Emilianowicz
  • M. Supernak
  • A. Ossowska

  - Polish Maritime Research - Rok 2022

  The article presents an innovative method of corrosion tests using the acoustic emission method and the corrosion tester. The problem of corrosion occurring in ballast tanks and tanks carrying petroleum products is discussed. The acoustic method is presented which, due to the use of a unique corrosion tester, is used to monitor the course of corrosion processes in steel. The principle of operation of the corrosion tester, its construction...

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• Autonomous Control of the Underwater Remotely Operated Vehicle in Collision Situation with Stationary Obstacle

  Publikacja

  • R. Śmierzchalski
  • M. Kapczyński

  - Polish Maritime Research - Rok 2022

  The article considers the problem of autonomous control of the underwater remotely operated vehicle mini Remotely Operated Vehicle (ROV) in a collision situation with a stationary obstacle. The control of the collision avoidance process is presented as a synthesis of fuzzy proportional-differential controllers for the control of distance and orientation concerning the detected stationary obstacle. The control of the submergence...

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• ENERGY AND EMISSION QUALITY RANKING OF NEWLY PRODUCED LOW-SULPHUR MARINE FUEL

  Publikacja

  • Z. Korczewski

  - Polish Maritime Research - Rok 2022

  The article describes the methodology of engine tests on new types of low-sulphur marine fuels in laboratory conditions in order to conduct a comprehensive assessment of their suitability for powering full-size marine engines. The innovativeness of the proposed solution consists of adapting the laboratory Diesel Engine Test Bed to carry out experimental tests using residual and alternative fuels so that it is possible to imitate...

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• Heave Plates with Holes for Floating Offshore Wind Turbines

  Publikacja

  • E. Ciba
  • P. Dymarski
  • M. Grygorowicz

  - Polish Maritime Research - Rok 2022

  The paper presents an innovative solution which is heave plates with holes. The long-known heave plates are designed to damp the heave motion of platforms. They are most often used for Spar platforms. The growing interest in this type of platform as supporting structures for offshore wind turbines makes it necessary to look for new solutions. Based on the available literature and the authors’ own research, it was concluded that...

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• Impact of Propeller Emergence on Hull, Propeller, Engine, and Fuel Consumption Performance in Regular Head Waves

  Publikacja

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

  - Polish Maritime Research - Rok 2022

  In this study, the impact of propeller emergence on the performance of a ship (speed), propeller (thrust, torque, and RPM), a diesel engine (torque and RPM) and fuel consumption are analysed under severe sea conditions. The goal is to describe the variation in the system variables and fuel consumption rather than analysing the motion of the ship or the phenomenon of propeller ventilation in itself. A mathematical model of the...

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

  Publikacja

  • J. Kowalski
  • J. Kozak

  - Polish Maritime Research - Rok 2022

  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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• INVESTIGATION OF THE CHARACTERISTICS OF A LOWEMISSION GAS TURBINE COMBUSTION CHAMBER OPERATING ON A MIXTURE OF NATURAL GAS AND HYDROGEN

  Publikacja

  • S. Serbin
  • K. Burunsuz
  • D. Chen
  • J. Kowalski

  - Polish Maritime Research - Rok 2022

  T his article is devoted to the investigation of the characteristics of a low-emission gas turbine combustion chamber, which can be used in Floating Production, Storage and Offloading (FPSO) vessels and operates on a mixture of natural gas and hydrogen. A new approach is proposed for modelling the processes of burning out a mixture of natural gas with hydrogen under preliminary mixing conditions in gaseous fuel with an oxidizer...

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• Monitoring the gas turbine start-up phase on the platform using a hierarchical model based on Multi-Layer Perceptron networks

  Publikacja

  • T. Niksa-Rynkiewicz
  • A. Witkowska
  • J. Głuch
  • M. Adamowicz

  - Polish Maritime Research - Rok 2022

  Very often, the operation of diagnostic systems is related to the evaluation of process functionality, where the diagnostics is carried out using reference models prepared on the basis of the process description in the nominal state. The main goal of the work is to develop a hierarchical gas turbine reference model for the estimation of start-up parameters based on multi-layer perceptron neural networks. A functional decomposition...

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• On the Use of Selected 4th Generation Nuclear Reactors in Marine Power Plants

  Publikacja

  • M. Drosińska-Komor
  • J. Głuch
  • Ł. Breńkacz
  • P. Ziółkowski

  - Polish Maritime Research - Rok 2022

  This article provides a review of the possibility of using different types of reactors to power ships. The analyses were carried out for three different large vessels: a container ship, a liquid gas carrier and a bulk carrier. A novelty of this work is the analysis of the proposal to adapt marine power plants to ecological requirements in shipping by replacing the conventional propulsion system based on internal combustion engines...

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• Prediction of Weld Deformations by Numerical Methods - Review

  Publikacja

  • J. Kozak

  - Polish Maritime Research - Rok 2022

  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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• 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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Rok 2021

• ASSESSING THE POTENTIAL REPLACEMENT OF MINERAL OIL WITH ENVIRONMENTALLY ACCEPTABLE LUBRICANTS IN A STERN TUBE BEARING: AN EXPERIMENTAL ANALYSIS OF BEARING PERFORMANCE

  Publikacja

  • J. Kowalski
  • W. Leśniewski
  • D. Piątek
  • D. Cuper-Przybylska

  - Polish Maritime Research - Rok 2021

  T his study compares the performance of a plain bearing, with a similar structure to a tail shaft stern bearing, lubricated with either mineral oil or an environmentally acceptable lubricant (EAL). The main characteristic of the bearing is its length/diameter ratio of <1. Measurements are carried out with the bearing operating under loads from 0.5 to 1 MPa and seven speeds ranging from 1 to 11 rev/s. The bearing lubricated...

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• DETERMINATION OF THE AERODYNAMIC DRAG OF PNEUMATIC LIFE RAFTS AS A FACTOR FOR INCREASING THE RELIABILITY OF RESCUE OPERATIONS

  Publikacja

  • E. Ksiązkiewicz
  • J. Jachowski
  • I. Szwoch

  - Polish Maritime Research - Rok 2021

  Ensuring the safety of ship crews at sea is of the utmost importance. Life rafts are one of the basic components of any seagoing vessel and ensuring their stability is an important component of maritime research. This study concerns the determination of the aerodynamic drag coefficients of pneumatic life rafts in a full range of wind speed and directions. The drag coefficients are based on full-scale experimental studies and numerical...

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• DIAGNOSTIC INFORMATION ANALYSIS OF QUICKLY CHANGING TEMPERATURE OF EXHAUST GAS FROM MARINE DIESEL ENGINE PART I SINGLE FACTOR ANALYSIS

  Publikacja

  • P. Puzdrowska

  - Polish Maritime Research - Rok 2021

  In this paper, attention was paid to the problem of low controllability of marine medium- and high-speed engines during operation, which significantly limits the parametric diagnosis. The measurement of quickly changing temperature of engine exhaust gas was proposed, the courses of which can be a source of diagnostic information. The F statistic of the Fisher-Snedecor distribution was chosen as a statistical tool. Laboratory tests...

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• ENERGY ANALYSIS OF THE PROPULSION SHAFT FATIGUE PROCESS IN A ROTATING MECHANICAL SYSTEM PART III DIMENSIONAL ANALYSIS

  Publikacja

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

  - Polish Maritime Research - Rok 2021

  This article presents the third and last part of the problem of diagnosing the fatigue of marine propulsion shafts in terms of energy with the use of the action function, undertaken by the authors. Even the most perfect physical models of real objects, observed under laboratory conditions and developed based on the results of their research, cannot be useful in diagnostics without properly transferring the obtained results to the...

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• EVALUATION OF EFFECTIVENESS OF WATERJET PROPULSOR FOR A SMALL UNDERWATER VEHICLE

  Publikacja

  • L. Rowiński

  - Polish Maritime Research - Rok 2021

  T he goal of the project described is to replace the existing propulsion system of a small underwater vehicle with a solution less prone to mechanical damage and ensuring a lower risk of the entanglement of fibrous objects suspended in the body of water. Four typical marine screws are utilised in the current design of the vehicle. One possible solution of the problem is the application of waterjet propulsors located...

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• EXPERIMENTAL AND NUMERICAL INVESTIGATION ON SPECIMEN GEOMETRY EFFECT ON THE CTOD VALUE FOR VL-E36 SHIPBUILDING STEEL

  Publikacja

  • J. Kowalski

  - Polish Maritime Research - Rok 2021

  There are special cases in the marine industry, where additional material tests, such as the fracture toughness test, must be performed. Additional fracture toughness tests, such as CTOD (Crack Tip Opening Displacement), are typically performed on three-point bend specimens. The dimension that defines all the specimen dimensions is the thickness of the material to be tested. It is recommended by classification societies (e.g. DNVGL)...

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• HEAVE MOTION OF A VERTICAL CYLINDER WITH HEAVE PLATES

  Publikacja

  • E. Ciba

  - Polish Maritime Research - Rok 2021

  The shape of a vertical cylinder resembles the classic form of a spar platform. Spar platforms are floating platforms that are successfully used in waters of great depths and have several advantages that mean they are readily used in the oil industry. Many of these advantages are also relevant to their application for offshore wind turbines, which is currently being considered. In the hydrodynamic analysis of spar platforms, the...

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• INFLUENCE OF SOLID PARTICLE CONTAMINATION ON THE WEAR PROCESS IN WATER LUBRICATED MARINE STRUT BEARINGS WITH NBR AND PTFE BUSHES

  Publikacja

  • E. Wojtowicz (dawniej: E. Piątkowska)

  - Polish Maritime Research - Rok 2021

  This paper reports on a study of the influence of solid particle contamination on the wear process in water-lubricated slide bearings (steel-acrylonitrile-butadiene rubber (NBR) and steel- polytetrafluoroethylene (PTFE)). To compare the wear of the shaft journal and bushes (NBR and PTFE) when lubricated with fresh water and contaminated water, an experiment was carried out to identify key factors that influence the state of wear...

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