Rok 2022

• 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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Rok 2023

• 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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Rok 2019

• 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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Rok 2020

• Hydrodynamic Model of the New Waterway through the Vistula Spit

  Publikacja

  • M. Szydłowski
  • T. Kolerski

  - Polish Maritime Research - Rok 2020

  The decision to build a new waterway (strait) in the Polish part of the Vistula Spit was made in 2017. The new connection between the Gulf of Gdańsk and the Vistula Lagoon is planned as an artificial navigable channel with a lock and a small port. During storm surges and wind tides in the gulf or in the lagoon, sluicing will be re-quired for vessels to tackle the Vistula Spit. This procedure does not require significant water flow...

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• Influence of process of straightening ship hull structure made of 316L stainless steel on corrosion resistance and mechanical properties

  Publikacja

  • J. Kowalski
  • Ł. Licznerski
  • M. Supernak (dawniej: M. Supernak-Marczewska)
  • K. Emilianowicz

  - Polish Maritime Research - Rok 2020

  The AISI 316L type steel belongs to the group of chromium-nickel stainless steels. They are determined according to European standards as X2CrNiMo17-12-2 and belong to the group of austenitic stainless steels. Steels of this group are used for elements working in seawater environments, for installations in the chemical, paper, and food, industries, for architectural elements, and many others. The chemical composition of corrosion-resistant...

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• Investigations of the Working Process in a Dual-Fuel Low-Emission Combustion Chamber for an FPSO Gas Turbine Engine

  Publikacja

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

  - Polish Maritime Research - Rok 2020

  This investigation is devoted to an analysis of the working process in a dual-fuel low-emission combustion chamber for a floating vessel’s gas turbine. The low-emission gas turbine combustion chamber with partial pre-mixing of fuel and air inside the outer and inner radial-axial swirlers was chosen as the object of research. When modelling processes in a dual-flow low-emission gas turbine combustion chamber, a generalized method...

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• Limiting distribution of the three-state semi-Markov model of technical state transitions of ship power plant machines and its applicability in operational decision-making.

  Publikacja

  • J. Girtler

  - Polish Maritime Research - Rok 2020

  The article presents the three-state semi-Markov model of the process {W(t): t 0} of state transitions of a ship power plant machine, with the following interpretation of these states: s1 – state of full serviceability, s2 – state of partial serviceability, and s3 – state of unserviceability. These states are precisely defined for the ship main engine (ME). A hypothesis is proposed which explains the possibility of application...

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• LNG TANK IN ŚWINOUJŚCIE: NONLINEAR ANALYSIS OF THE TANK DOME ELEMENTS BEHAVIOUR

  Publikacja

  • B. Sobczyk

  - Polish Maritime Research - Rok 2020

  In this paper, the dome of a tank in the Świnoujście LNG terminal is analysed. Some of the rafter ribs at the connection with hangers were not mounted during construction of the tank dome. Therefore, it has become necessary to estimate its response, which has been done with the aid of some computational models of the dome, that have been created in the finite element method environment. Different local models are studied, aiming...

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• MULTI-CRITERIA COMPARATIVE ANALYSIS OF THE USE OF SUBTRACTIVE AND ADDITIVE TECHNOLOGIES IN THE MANUFACTURING OF OFFSHORE MACHINERY COMPONENTS

  Publikacja

  • M. Deja
  • M. Siemiątkowski
  • D. Zieliński

  - Polish Maritime Research - Rok 2020

  The dynamic development of additive manufacturing technologies, especially over the last few years, has increased the range of possible industrial applications of 3D printed elements. This is a consequence of the distinct advantages of additive techniques, which include the possibility of improving the mechanical strength of products and shortening lead times. Offshore industry is one of these promising areas for the application...

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Rok 2011

• Hydrostatic drives as safe and energy saving machines. The drive investigation method compatible diagram of power increase opposite to the direction of power flow

  Publikacja

  • Z. Paszota

  - Polish Maritime Research - Rok 2011

  Projektanci i producenci napędu hydrostatycznego nie dysponują możliwością dokładnego określania jego sprawności energetycznej zmieniającej się szeroko w polu pracy napędzanego urządzenia a więc w pełnym zakresie zmiany prędkości i obciążenia silnika hydraulicznego oraz lepkości zastosowanego czynnika roboczego. Dotyczy to zarówno określania strat i sprawności maszyn wyporowych (pompy i silnika hydraulicznego) zastosowanych w układzie...

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• Influence of local bush wear on properties of water lubricated marine stern tube bearings

  Publikacja

  • W. Litwin

  - Polish Maritime Research - Rok 2011

  W artykule przedstawiono propozycję metody obliczania łożysk ślizgowych smarowanych cieczą o niskiej lepkości (wodą) w których doszło do lokalnego zużycia panwi. Proponowana metoda uwzględnia sprężystą deformację panwi (model EHL) oraz zmianę geometrii będącą wynikiem zużycia.

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• Life tests of a rotary single-stage magnetic-fluid seal for shipbuilding applications

  Publikacja

  • L. Matuszewski
  • Z. Szydło

  - Polish Maritime Research - Rok 2011

  Use of the magnetic fluid seal technology in water is much more difficult technological problem in comparisonto gas or vacuum environment. Some seals constructed up to time been are designed as hybrid, two stagesealing structures with shields or mechanical seals used as protection measures to the magnetic fluid seal.Anyway, there is always problem with immediate contact between magnetic fluid and the environmentalliquid. In the...

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• Metody analizy zapachu

  Publikacja

  • P. Biernacka
  • T. Chmiel
  • T. Dymerski
  • W. Wardencki

  - Polish Maritime Research - Rok 2011

  Zmysł węchu to jeden z dwóch, oprócz smaku, zmysłów chemicznych. Istota tego zmysłu polega na umiejętności rozpoznawania i występowania zapachu określonych związków chemicznych lub ich mieszanin w otoczeniu. W artykule przedstawione zostały metody analizy zapachu m.in. metody klasycznej analizy sensorycznej, chromatografii gazowej połączonej z detekcją olfaktometryczną oraz elektroniczny nos.

Rok 2015

• IDENTIFICATION OF DAMAGES OF TRIBOLOGICAL ASSOCIATIONS IN CRANKSHAFT AND PISTON SYSTEMS OF TWO-STROKE INTERNAL COMBUSTION ENGINES USED AS MAIN PROPULSION IN SEA-GOING VESSELS AND PROPOSAL OF PROBABILISTIC DESCRIPTION OF LOADS AS CAUSES OF THESE DAMAGES

  Publikacja

  • J. Girtler

  - Polish Maritime Research - Rok 2015

  The article discusses damages of essential tribological associations in crankshaft and piston systems of large power two-stroke engines used as main engines, which take place during transport tasks performed by those ships. Difficulties are named which make preventing those damages impossible, despite the fact that the technical state of engines of this type is identified with the aid of complex diagnostic systems making use of...

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• Influence of pitting corrosion on fatigue and corrosion fatigue of ship and offshore structures. Part II: Load - pit crack interaction

  Publikacja

  • M. Jakubowski

  - Polish Maritime Research - Rok 2015

  In the paper has been discussed influence of stresses on general corrosion rate and corrosion pit nucleation and growth rate, whose presence has been questioned by some authors but accepted by most of them. Influence of pit walls roughness on fatigue life of a plate suffering pit corrosion and presence of so called "non damaging" pits which never lead to initiation of fatigue crack, has been presented. Possibility of prediction...

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• Inlet air fogging of marine gas turbine in power output loss compensation

  Publikacja

  • Z. Domachowski
  • M. Dzida

  - Polish Maritime Research - Rok 2015

  The use of inlet air fogging installation to boost the power for gas turbine engines is widely applied in the power generation sector. The application of fogging to mechanical drive is rarely considered in the literature [1]. This paper will cover some considerations relating to its application to gas turbines in ship drive. There is an important evaporative cooling potential throughout the world when the dynamic data is evaluated,...

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• MARITIME LASER SCANNING AS THE SOURCE FOR SPATIAL DATA

  Publikacja

  • P. Burdziakowski
  • A. Janowski
  • A. Kholodkov
  • K. Matysik
  • M. Matysik
  • M. Przyborski
  • J. Szulwic
  • P. Tysiąc
  • A. Wojtowicz

  - Polish Maritime Research - Rok 2015

  The rapid development of scanning technology, especially mobile scanning, gives the possibility to collect spatial data coming from maritime measurement platforms and autonomous manned or unmanned vehicles. Presented solution is derived from the mobile scanning. However we should keep in mind that the specificity of laser scanning at sea and processing collected data should be in the form acceptable in Geographical Information...

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• METHOD TO EXTEND OPERATIONABILITY OF WEB-GIS BASED MARINE SERVICES USING SSE PLATFORM

  Publikacja

  • K. Drypczewski
  • A. Stepnowski
  • K. Bruniecki

  - Polish Maritime Research - Rok 2015

  Earth Observation (EO) products are widely used by geospatial society. Over the last years a number of new applications of satellite imagery were proposed. This led to an increased interest in EO products, not only from researchers but also from companies and individuals. The authors constitute the essential part of the team that created the marine, web-GIS system - SafeCity GIS - for dissemination of data obtained from a 1.5...

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Rok 2010

• Identification of hydroacoustic wave sources of ship in motion

  Publikacja

  • E. Kozaczka
  • J. Domagalski

  - Polish Maritime Research - Rok 2010

  This paper deals with results of identification tests of acoustic field spectrum of underwater noise generated by ship in motion. The field is connected with acoustic activity of ship mechanisms and devices in operation. Vibration energy generated by the mechanisms and devices is transferred through ship structural elements to surrounding water where it propagates in the form of acoustic waves of a broad band of frequencies. In...

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• Influence of main design parameters of ship propeller shaft water-lubricated bearings on their properties

  Publikacja

  • W. Litwin

  - Polish Maritime Research - Rok 2010

  W artykule omówiono wpływ głównych parametrów konstrukcyjnych i eksploatacyjnych takich jak wielkość luzu łożyskowego, własności materiału panwi, stanu powierzchni skojarzenia ślizgowego oraz temperatury i zasolenia wody na nośność hydrodynamiczną łożyska okrętowego wału śrubowego smarowanego wodą.

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• Investigation of the underwater noise produced by ships by means of intensity method

  Publikacja

  • E. Kozaczka
  • J. Domagalski
  • I. Gloza

  - Polish Maritime Research - Rok 2010

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• Mathemathical model of radial passive magnetic bearing

  Publikacja

  • L. Matuszewski
  • K. Falkowski

  - Polish Maritime Research - Rok 2010

  In the article mathematical radial model of passive magnetic bearings to ocean engineering units has been presented. The units application in underwater thrusters should increase propulsion systems durability and gives lower maintenance costs. The rotor of electric motor is hanging in magnetic field taken from radial passive magnetic bearings. However axial direction maintenance must be controlled with electromagnets and their...

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Rok 2017

• Implementation of spatial information for monitoring and analysis of the area around the port using laser scanning techniques

  Publikacja

  • K. Bobkowska
  • A. Inglot
  • M. Mikusova
  • P. Tysiąc

  - Polish Maritime Research - Rok 2017

  Nowadays, maritime infrastructure is heavily exploited, which requires monitoring. The article presents the implementation of spatial information which are point clouds for monitoring and analysis of the area around the port (buildings and wharves). For this study, point clouds coming from terrestrial (TLS) and airborne laser scanning (ALS), each of them having different accuracy, were used. An important part of the analysis was...

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• Influence of water and mineral oil on the leaks in satellite motor commutation unit clearances

  Publikacja

  • P. Śliwiński

  - Polish Maritime Research - Rok 2017

  The article describes the flow rates of mineral oil and water flowing, as working media, through the commutation unit of a hydraulic satellite motor. It is demonstrated that geometrical dimensions of commutation unit clearances change as a function of the machine shaft rotation angle. Methods for measuring the rate of this flow and the pressure in the working chamber are presented. The results of pressure measurements in the working...

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• Internet photogrammetry for inspection of seaports

  Publikacja

  • Z. Paszotta
  • M. Szumiło
  • J. Szulwic

  - Polish Maritime Research - Rok 2017

  This paper intends to point out the possibility of using Internet photogrammetry to construct 3D models from the images obtained by means of UAVs (Unmanned Aerial Vehicles). The solutions may be useful for the inspection of ports as to the content of cargo, transport safety or the assessment of the technical infrastructure of port and quays. The solution can be a complement to measurements made by using laser scanning and traditional...

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• Investigations On Water Circulation in Animal Sea-Water Basins – On the Example of Seals′ Breeding Pools

  Publikacja

  • P. Zima

  - Polish Maritime Research - Rok 2017

  This paper presents general comments concerning investigations on water circulation in animal breeding pools containing sea water. As an example are given results of computer simulation of water circulation in seals’ breeding pools situated in Marine Station at Hel, belonging to Oceanographic Institute, Gdansk University. A mathematical model of three main pools was prepared with taking into account their inflow and outflow water...

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• Living and working beneath the sea – next approach

  Publikacja

  • L. Rowiński

  - Polish Maritime Research - Rok 2017

  The idea of living beneath the sea is very new if compared with millennia of shipping activity. In fact, ocean surface was considered mainly as medium suitable for transport of persons and goods as well as aggression and robbery. More practical attempts to live “on” the water surface are limited to well protected internal waters. The presented concept of “an underwater-above water accommodation, especially for residential purposes”...

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• MAPPING SOUTH BALTIC NEAR-SHORE BATHYMETRY USING SENTINEL-2 OBSERVATIONS

  Publikacja

  • A. Chybicki

  - Polish Maritime Research - Rok 2017

  One of the most promising new applications of remote observation satellite systems (RO) is the near-shore bathymetry estimation based on spaceborn multispectral imageries. In recent years, many experiments aiming to estimate bathymetry in optically shallow water with the use of remote optical observations have been presented. In this paper, optimal models of satellite derived bathymetry (SDB) for relatively turbid waters of the...

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• Modelling and Simulation of a New Variable Stiffness Holder for Milling of Flexible Details

  Publikacja

  • K. J. Kaliński
  • M. Galewski
  • M. Mazur
  • M. Chodnicki

  - Polish Maritime Research - Rok 2017

  Modern industry expectations in terms of milling operations often demand the milling of the flexible details by using slender ball-end tools. This is a difficult task because of possible vibration occurrence. Due to existence of certain conditions (small depths of cutting, regeneration phenomena), cutting process may become unstable and self-excited chatter vibration may appear. Frequency of the chatter vibration is close to dominant...

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• Multi-objective weather routing of sailing vessels

  Publikacja

  • M. Życzkowski
  • R. Szłapczyński

  - Polish Maritime Research - Rok 2017

  The paper presents a multi-objective deterministic method of weather routing for sailing vessels. Depending on a particular purpose of sailboat weather routing, the presented method makes it possible to customize the criteria and constraints so as to fit a particular user’s needs. Apart from a typical shortest time criterion, safety and comfort can also be taken into account. Additionally, the method supports dynamic weather data:...

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• Numerical Modelling of Structures with Uncertainties

  Publikacja

  • M. Kahsin

  - Polish Maritime Research - Rok 2017

  The nature of environmental interactions, as well as large dimensions and complex structure of marine offshore objects, make designing, building and operation of these objects a great challenge. This is the reason why a vast majority of investment cases of this type include structural analysis, performed using scaled laboratory models and complemented by extended computer simulations. The present paper focuses on FEM modelling...

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Rok 2018

• INCREASING POWER SUPPLY SAFETY IN THE ASPECT OF SUPPORTING THE RENEWABLE ENERGY SOURCES BY CONVENTIONAL AND VIRTUAL POWER STORES

  Publikacja

  • D. Jakowski
  • M. Dzida

  - Polish Maritime Research - Rok 2018

  This paper presents characteristics and purposefulness of supporting the renewable energy sources (OZE) by means of energy stores. The main emphasis was placed on analysis of virtual energy stores available for implementation in Polish economy conditions. A role which management of Demand Side Response (DSR) may play in balancing Polish electric power system, is discussed. Implementation of such solutions together with conventional...

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• INDICES FOR ASSESSING POTENTIAL ENVIRONMENTAL HAZARD FROM FUTURE SHIP SCRAPPING PROCESS, DETERMINABLE IN SHIP DESIGN STAGE

  Publikacja

  • R. Liberacki

  - Polish Maritime Research - Rok 2018

  This paper shortly presents the issue of utilization of ships after their withdrawal from service. Information on number of floating units liquidated in previous years was presented. Hazards to the environment , health and life of workers employed in the Far East ship scrapping yards operating on the beaches, were indicated. Then, the most important rules which have to make the ship recycling process safe were referred to. This...

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• Influence of geotechnical conditions on damage states of Gdansk Bay Coast cliff formations

  Publikacja

  • E. Mieloszyk
  • M. Wyroślak

  - Polish Maritime Research - Rok 2018

  A geotechnical aspect of destruction processes of seashores was identified based on the case of erosion of Gdansk Bay Coast cliff formations. Causative factors of landslide were described in the context of natural phenomena, land development and its anthropogenic transformations. Possible directions of theoretical analysis of changes in groundwater relations were indicated.

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• Influence of lubricating oil improvers on performance of crankshaft seals

  Publikacja

  • P. Bzura

  - Polish Maritime Research - Rok 2018

  This paper presents an original method for checking influence of lubricating oil improvers on performance of crankshaft seals of combustion piston engine. Crankshaft seals were tested with the use of a modified friction node of T-02 four- ball apparatus in laboratory conditions. The tests were conducted according to a worked-out algorithm. Their results confirmed usefulness of the method for determining „harmful” performance...

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• Influence of Natural Conditions on the Imaging of the Bottom of the Gdańsk Bay by Means of the Side Scan Sonar

  Publikacja

  • D. Witos-Okrasińska
  • G. Grelowska
  • E. Kozaczka

  - Polish Maritime Research - Rok 2018

  The interest in underwater resources is the reason for the development of modern hydroacoustic systems, including side sonars, which find numerous applications such as: research of seabed morphology and sediment characteristics, preparation of sea sediment maps, and even in special cases of biocenoses such as sea grass meadows, detection of specific targets at the bottom such as shipwrecks, mines, identification of suitable sites...

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• Investigation method and mathematical model of pressure losses in hydraulic rotary motor

  Publikacja

  • A. Maczyszyn

  - Polish Maritime Research - Rok 2018

  Tis paper presents a way of determining the coefcient k of the pressure losses Δp (fow drag) in internal ducts 8 Mp of SWSB-63 hydraulic motor. Te coefcient is determined at a fow rate equal to the theoretical capacity Q of the Pt pump feeding the motor , the losses are related to the nominal pressure p in the hydraulic system. Te investigations n followed a model of energy performance of hydraulic rotary motor, proposed by...

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• Laboratory test rig for examining aggregate mining from seabed using the AIRLIFT method

  Publikacja

  • C. Dymarski
  • T. Pająk

  - Polish Maritime Research - Rok 2018

  The use of the Airlift method for transporting the mined aggregate from the seabed to the deck of the mining ship is an alternative for presently used solutions, such as suction pumps or scoop transport for instance. Building the laboratory test rig was preceded by tests in natural conditions. The rig was designed in such a way as to model these conditions as close as possible, and to have potential for further development

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• Longitudinal Motion Due to Action of Tunnel Thrusters

  Publikacja

  • M. Reichel

  - Polish Maritime Research - Rok 2018

  Tunnel thrusters are propulsion and active control devises that provide a side force, or transverse thrust, to support mooring operations or position keeping. They shorten the time of manoeuvring, reduce the cost of towage and since inception, manoeuvrability specifically in ports has become a lot easier. Tunnel thrusters can either be operated manually or with the help of Dynamic Positioning systems which makes it even more efficient. Theoretically,...

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• MEMS Technology Quality Requirements as Applied to Multibeam Echosounder

  Publikacja

  • K. Bikonis
  • J. Demkowicz

  - Polish Maritime Research - Rok 2018

  Small, lightweight, power-efficient, and low-cost microelectromechanical system (MEMS) inertial sensors and microcontrollers, available in the market today, help reduce the instability of Multibeam Sonars. Current MEMS inertial measurement units (IMUs) come in many shapes, sizes, and costs — depending on the application and performance required. Although MEMS inertial sensors offer affordable, appropriately scaled units, they are...

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• Mobile Laser Scanning Calibration on a Marine Platform

  Publikacja

  • J. Szulwic
  • P. Tysiąc

  - Polish Maritime Research - Rok 2018

  The article describes the method of calibration of the Riegl VMZ-400 mobile scanning system on a floating platform and an experiment aimed at conducting measurements from a previously calibrated instrument. The issue of factors affecting the quality of measurements was discussed. Mobile laser scanning is an increasingly popular measurement solution, but it is still innovative on a European scale. The use of a floating platform...

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• Modeling of the Two-Dimensional Flow Caused by Sea Conditions and Wind Stresses on the Example of Dead Vistula

  Publikacja

  • P. Zima

  - Polish Maritime Research - Rok 2018

  The article presents the results of two-dimensional modeling of flows caused by the sea conditions and wind stresses on the example of Dead Vistula. Based on the available bathymetric data, a numerical model of the river section was created, which was supplemented with data on the position of the water table depending on hydrometeorological conditions. To describe the flow field in steady conditions, a simplified model of two-dimensional...

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• Multi-objective weather routing of sailboats considering wave resistance

  Publikacja

  • M. Życzkowski
  • P. Krata
  • R. Szłapczyński

  - Polish Maritime Research - Rok 2018

  The article presents a method to determine the route of a sailing vessel with the aid of deterministic algorithms. The method assumes that the area in which the route is to be determined is limited and the basic input data comprise the wind vector and the speed characteristic of the vessel. Compared to previous works of the authors, the present article additionally takes into account the effect of sea waves with the resultant resistance...

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• NetBaltic System-Heterogenous Wireless Network for Maritime Communications

  Publikacja

  • M. Hoeft
  • K. Gierłowski
  • J. Rak
  • J. Woźniak

  - Polish Maritime Research - Rok 2018

  In case of maritime communications, we observe a growing interest in deployment of multitask satellite-based solutions and development of new maritime-specific systems intended for improvements in safety of e-navigation. Analysis of different types of currently used maritime communication systems leads, however, to a conclusion that neither global and still very expensive satellite systems nor cheaper, but short-ranged transmission...

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• New Concept of Numerical Ship Motion Modelling for Total Ship Operability Analysis by Integrating Ship and Environment Under One Overall System

  Publikacja

  • H. Olszewski
  • M. H. Ghaemi

  - Polish Maritime Research - Rok 2018

  The paper presents a new concept of overall ship motion modelling for application to total ship operability. The delivered model is a multi-phase and includes both submerged part of ship’s hull and the surrounding water as a unique body. The Discrete Finite Element Method is applied. The model is successfully examined and illustrated for a selected AHTS.

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• NON-LINE ANALYSIS OF STIFFNESS IN COMPRESSION CONDITIONS

  Publikacja

  • M. Kahsin
  • D. Stecki

  - Polish Maritime Research - Rok 2018

  The analyzes were aimed at demonstrating the influence of parameters describing the deformation of the structure on the uncertainty of critical force, and the impact of technological imperfections on stress uncertainty in compression conditions. In a linear buckling analysis, the problem is considered only for the initial, permanent state of the stiffness matrix. In the case of demonstrating the influence of initial deformations...

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• NUMERICAL MODEL OF PLASTIC DESTRUCTION OF THICK STEEL STRUCTURAL ELEMENTS

  Publikacja

  • J. Kowalski
  • J. Kozak

  - Polish Maritime Research - Rok 2018

  In the shipbuilding industry, the risk of brittle fracture of the structure is limited by using certified materials with specified impact strength, determined by the Charpy method (for a given design temperature) and by supervising the welding processes (technology qualification, production supervision, non-destructive testing). For off-shore constructions, classical shipbuilding requirements may not be sufficient. Therefore, the...

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Rok 2003

• Influence of adjustment of gas turbine controller on ship propulsion system behaviour in rough sea conditions. Part 1. The dynamic model of propulsion system.

  Publikacja

  • M. Dzida

  - Polish Maritime Research - Rok 2003

  Przedstawiono model dynamiki układu napędowego okrętowego, wykorzystując metodę elementów skończonych. Układ napędowy składa się z dwóch turbin gazowych napędzających poprzez przekładnię mechaniczną zębatą pędnik o nastawnym skoku. W symulacji układu napędowego można zadawać wymuszenia wartością zadaną nastaw prędkości na regulatorze, wymuszenia od falowania morza w zależności od stanu morza, jak również zmianą ustawienia skoku...

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• On application of the Case-Based Reasoning methods in ship automation design

  Publikacja

  • M. Meler-Kapcia
  • S. Zieliński
  • Z. Kowalski

  - Polish Maritime Research - Rok 2003

  W artykule przedstawiono metodę wnioskowania na podstawie przypadków oraz dwa przykłady jej zastosowania w projektowaniu statków. Pierwszy przykład dotyczy systemu projektowania koncepcyjnego statku. Drugi przykład odnosi się do projektowania układów automatyki okrętowej. Omówiono szczegółowo problemy doboru funkcji podobieństwa w metodzie wnioskowania na podstawie przypadków.

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• On possible lowering fuel oil consumption by differentiating loads on ship diesel engines running in parrallel.

  Publikacja

  • J. Herdzik
  • A. Balcerski

  - Polish Maritime Research - Rok 2003

  Podano możliwości zmniejszenia zużycia paliwa przez silniki okrętowe pracujące równolegle dzieki różnicowaniu ich obciążeń eksploatacyjnych. Zaprezentowano podstawy teoretyczne oraz sposób postępowania przy pomiarach zużycia paliwa w czasie rzeczywistym.

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Rok 2008

• Influence of cathodic-protection-induced hydrogenation on mechanical properties of two ship hull plate steels

  Publikacja

  • M. Jakubowski
  • Ł. Modelski
  • M. Podbereski

  - Polish Maritime Research - Rok 2008

  Przedstawiono wyniki próby rozciągania i udarowej Charpy V dla stali zwykłej wytrzymałości (kategorii A) i podwyższonej wytrzymałości (kat. AH32) zarówno w stanie dostawy jak i po nawodorowaniu (protektor Zn w słonej wodzie). Nawodorowanie obydwu stali zwiększyło nieco granicę plastyczności (Re) i wydłużenie (A), nie zmieniając (atal A) lub nieco zmniejszając przewężenie (Z). Wpływ nawodorowania na udarność był ewidentnie pozytywny...

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• Investigations of operational driving loads of bucket chains and manoeuvre hoisting winches on multi-bucket dredgers

  Publikacja

  • D. Bocheński

  - Polish Maritime Research - Rok 2008

  Artykuł dotyczy zagadnień wstępnego projektowania siłowni pogłębiarek wieloczerpakowych. Niniejszy artykuł przedstawia wyniki badań eksploatacyjnych sześciu pogłębiarek wieloczerpakowych. Badania eksploatacyjne obejmowały pomiary parametrów charakteryzujących warunki pracy dwóch podstawowych głównych odbiorników energii mechanicznej na pogłębiarkach wieloczerpakowych a mianowicie łańcuchów czerpakowych i zespołu wciągarek manewrowych....

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• Modelling of vibrations of a liquid filled tank

  Publikacja

  • K. Trębacki

  - Polish Maritime Research - Rok 2008

  Przeprowadzono analizę teoretyczną i numeryczną zbiorników długich i krótkich wypełnionych całkowicie lub częściowo cieczą. Wyznaczenie obciążeń hydrodynamicznych dotyczy bezpośrednio wytrzymałości konstrukcji samego zbiornika, a przez to pozwala określić wytrzymałość konstrukcyjną całego kadłuba. Szczególne wymagania stawiane są zbiornikom do przewozu cieczy radioaktywnych, gdyż należy zapewnić bardzo wysoki stopień bezpieczeństwa...

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• Multihull vessel excitations in stochastic formulation

  Publikacja

  • A. Królicka-Gałązka (dawniej: A. Królicka)

  - Polish Maritime Research - Rok 2008

  Praca dotyczy określania wymuszeń wielokadłubowej jednostki pływającej w ujęciu stochastycznym. Wymuszenia ruchu jednostek pływających pochodzą od ruchu fal morskich i działania wiatru. Najczęściej jest to falowanie nieregularne i dlatego w badaniach dynamiki takich jednostek zakłada się, że proces falowania ma charakter probabilistyczny. Przeprowadzono analizę dynamiki jednostki wielokadłubowej na liniowym modelu, na który działa...

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• Numerical calculations of behaviour of ship double-bottom structure during grounding

  Publikacja

  • K. Niklas

  - Polish Maritime Research - Rok 2008

  Ideą projektu CORET jest dodanie do obecnej konstrukcji dna podwójnego statku specjalnych powłok polimerowo-betonowych w celu zwiększenia odporności na rozszczelnienie podczas kolizji, czy wejścia na mieliznę. Aby poprawnie zaprojektować te bariery ochronne konieczne jest przeprowadzenie symulacji numerycznej. Tworzenie modelu numerycznego konstrukcji podczas kolizji jest bardzo złożone i wymaga wykonania symulacji pomocniczych...

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• Numerical investigations of the engine cooling system in a small power vesel pod propulsion system

  Publikacja

  • C. Dymarski
  • W. Leśniewski

  - Polish Maritime Research - Rok 2008

  The development of electronics and electrotechnology enabled to put electric motors of the alternating current in the pod and to use them for the main drive of ships. A lot of heat which must be picked up from the system is a problem which is turning up at applying the system of this type. Many big ships lately contended with these problems. Building the small propeller for the boat powered with solar power we decided to check...

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Rok 2014

• Influence of pitting corrosion on fatigue and corrosion fatigue of ship structures. Part I: pitting corrosion of ship structures.

  Publikacja

  • M. Jakubowski

  - Polish Maritime Research - Rok 2014

  The paper is a literature survey focused on pitting corrosion and its influence on fatigue of ship and offshore steels. Mechanisms of short- and long-term pitting corrosion in marine environment have been described including pit nucleation and growth phases. Some models of pit growth versus time of exposure have been presented. Some factors which influence the pit growth have been discussed briefly.

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• Mathematical model defining volumetric losses of hydraulic oil compression in a variable capacity displacement pump

  Publikacja

  • Z. Paszota

  - Polish Maritime Research - Rok 2014

  The objective of the work is to develop the capability of evaluating the volumetric losses of hydraulic oil compression in the working chambers of high pressure variable capacity displacement pump. Volumetric losses of oil compression must be determined as functions of the same parameters, which the volumetric losses due to leakage, resulting from the quality of design solution of the pump, are evaluated as dependent on and also...

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• Monitoring of underdeck corrosion by using acoustic emission method

  Publikacja

  • K. Emilianowicz

  - Polish Maritime Research - Rok 2014

  This paper presents first short characteristics of underdeck corrosion process as well as a problem of its monitoring. Next is described an acoustic emission (AE) method elaborated by Department of Ship Technology , Quality Systems and Material Engineering, Gdańsk University of Technology in cooperation with partners of CORFAT project realized within 7th EU Frame Program . Further are presented short characteristics of the emission...

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• Numerical Analysis of the Unsteady Propeller Performance in the Ship Wake Modified by Different Wake Improvement Devices

  Publikacja

  • J. Szantyr
  • T. Bugalski

  - Polish Maritime Research - Rok 2014

  The paper presents summary of numerical analysis of the unsteady propeller forces and induced pressure pulses generated by the selected real propeller of 7000 tons product tanker, operating in five different wakefields including four inflenced by the different wake improvement devices. The results of the analysis are partly compared with experimental data and univocal conclusions about the optimum wake improvement device are presented.

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Rok 2012

• Influence of pitting corrosion on strength of steel ships and offshore structures

  Publikacja

  • M. Jakubowski

  - Polish Maritime Research - Rok 2012

  Praca dotyczy wpływu korozji wżerowej na własności mechaniczne stali o zwykłej i podwyższonej wytrzymałości oraz na wytrzymałość stalowych konstrukcji przy obciążeniach statycznych i quasi- statycznych. Artykuł oparty jest głównie na japońskich publikacjach. W próbie rozciągania, korozja wżerowa obniża nieznacznie obciążenie odpowiadające granicy plastyczności Re(nieznacznie) i wytrzymałości na rozciąganie Rm (silniej, redukuje...

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• Multi-stage magnetic-fluid seals for operating in water - life test procedure, test stand and research results

  Publikacja

  • L. Matuszewski

  - Polish Maritime Research - Rok 2012

  The edge criteria for magnetic-fluid seals durability research are critical for the seal'stechnological usefulness. The magnetic fluid seal technology in water is much moredifficult technological problem in comparison to gas or vacuum environment. There isalways problem with immediate contact between magnetic fluid and the environmentaluninspected liquids. In the paper are presented ways of experiments definitions carried outwith...

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• Numerical prediction of steady and unsteady tip vortex cavitation on hydrofoils

  Publikacja

  • P. Flaszyński
  • J. Szantyr
  • K. Tesch

  - Polish Maritime Research - Rok 2012

  Artykuł przedstawia metodę numeryczną do wyznaczania kawitujących wirów wierzchołkowych powstających za płatami nośnymi. Metoda ta jest oparta na rozwiązywanie dwufazowego turbulentnego przepływu cieczy lepkiej. Pozwala ona wyznaczyć geometrię kawitującego wiru dla różnych geometrii płata nośnego i dla różnych parametrów przepływu. Pokazano porównanie wyników obliczeń z pomiarami i rejestracjami wykonanymi na modelu płata w tunelu...

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Rok 2021

• 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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• INFLUENCE OF THE HULL SHAPE ON THE ENERGY DEMAND OF A SMALL INLAND VESSEL WITH HYBRID PROPULSION

  Publikacja

  • A. Karczewski
  • M. Kunicka

  - Polish Maritime Research - Rok 2021

  Recently, there has been a significant development of ecological propulsion systems, which is in line with the general trend of environmentally friendly “green shipping”. The main aim is to build a safe, low-energy passenger ship with a highly efficient, emission-free propulsion system. This can be achieved in a variety of ways. The article presents the main problems encountered by designers and constructors already at the stage...

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• INVESTIGATIONS OF THE EMISSION CHARACTERISTICS OF A DUAL-FUEL GAS TURBINE COMBUSTION CHAMBER OPERATING SIMULTANEOUSLY ON LIQUID AND GASEOUS FUELS

  Publikacja

  • S. Serbin
  • B. Diasamidze
  • V. Gorbov
  • J. Kowalski

  - Polish Maritime Research - Rok 2021

  T his study is dedicated to investigations of the working process in a dual-fuel low-emission combustion chamber for a floating vessel’s gas turbine. As the object of the research, a low-emission gas turbine combustion chamber with partial premixing of fuel and air inside the outer and inner radial-axial swirls was chosen. The method of the research is based on the numerical solution of the system of differential...

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• Joints Of Steel Sandwich Structures

  Publikacja

  • J. Kozak

  - Polish Maritime Research - Rok 2021

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

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• Minimizing Greenhouse Gas Emissions From Ships Using a Pareto Multi-Objective Optimization Approach

  Publikacja

  • Z. Domachowski

  - Polish Maritime Research - Rok 2021

  To confront climate change, decarbonization strategies must change the global economy. According to statements made as part of the European Green Deal, maritime transport should also become drastically less polluting. As a result, the price of transport must reflect the impact it has on the environment and on health. In such a framework, the purpose of this paper is to suggest a novel method for minimizing emissions...

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• NEW DESIGNS OF MAGNETIC FLUID SEALS FOR RECIPROCATING MOTION

  Publikacja

  • L. Matuszewski
  • P. Bela

  - Polish Maritime Research - Rok 2021

  T he operating conditions of magnetic fluid seals during reciprocating motion are so different from those observed in rotating motion that the use of their conventional structures for reciprocating motion seals yields no good results. The analysis of the sealing mechanism of magnetic fluid seals in reciprocating motion shows that the operation of these seals is affected by the carry-over phenomenon and magnetic fluid...

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• Numerical Estimation of Hull Hydrodynamic Derivatives in Ship Maneuvering Prediction

  Publikacja

  • R. Kołodziej
  • P. Hoffmann

  - Polish Maritime Research - Rok 2021

  Prediction of the maneuvering characteristics of the ship at the design stage can be done by means of model tests, computational simulations or a combination of both. The model tests can be realized as direct simulation of the standard maneuvers with the free running model, which gives the most accurate results, but is also the least affordable as it requires very large tank or natural lake, as well as complex equipment of the...

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Rok 2002

• Influence of the steam within seals and glands of the turbine on its rotor motion stability.

  Publikacja

  • Z. Walczyk

  - Polish Maritime Research - Rok 2002

  Przedstawiono metodę obliczania charakterystyk dynamicznych wpływu parowych uszczelnień turbin na ich dynamikę i stateczność ruchu wirników. Zarysowano model ''masowy'' uszczelnienia. Podano przykłady zastosowań.

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• Investigations of transverse stability of semi-displacement ships

  Publikacja

  • E. Brzoska
  • M. Grygorowicz
  • A. Rogalski

  - Polish Maritime Research - Rok 2002

  Przedstawiono wyniki eksperymentalnych badań modelowych poprzecznej stateczności jednostek półślizgowych, których celem było określenie wpływu prędkości oraz parametrów kształtu kadłuba na stateczność poprzeczną. Na podstawie wyników badań opracowano algorytmy, uwzględniające zmiany ramienia prostującego w funkcji prędkości, kąta przechyłu i parametrów geometrycznych kadłuba które mogą być wykorzystane do oceny stateczności poprzecznej...

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Rok 2016

• INFORMATION ABOUT DYNAMICS OF THE SEA SURFACE AS A MEANS TO IMPROVE SAFETY OF THE UNMANNED VESSEL AT SEA

  Publikacja

  • M. Przyborski

  - Polish Maritime Research - Rok 2016

  One of the fundamental states of the sea surface is its heave. Despite of years of the intense scientific inquiry, no clear understanding of the influence of this aspect on the dynamics of the sea environment has emerged. The separation of two nearby fluid elements which one may observed for example as a free floating of small objects on the sea surface (rescuers on the rough sea or small research vessels) is caused by the interaction...

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• MAPSERVER – INFORMATION FLOW MANAGEMENT SOFTWARE FOR THE BORDER GUARD DISTRIBUTED DATA EXCHANGE SYSTEM

  Publikacja

  • M. Blok
  • S. Kaczmarek
  • M. Młynarczuk
  • M. Narloch

  - Polish Maritime Research - Rok 2016

  In this paper the architecture of the software designed for management of position and identification data of floating and flying objects in Maritime areas controlled by Polish Border Guard is presented. The software was designed for managing information stored in a distributed system with two variants of the software, one for a mobile device installed on a vessel, an airplane or a car and second for a central server. The details...

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• Method of sum of power losses as a way for determining the ki coefficients of energy losses in hydraulic motor

  Publikacja

  • A. Maczyszyn

  - Polish Maritime Research - Rok 2016

  This paper shows application of the method of sum of power losses to determining energy losses which occur in hydraulic rotary motor in situation when not all laboratory data are at one’s disposal or when no use is made of data contained in catalogue charts. The method makes it possible to determine the coefficients ,ki , of energy losses occurring in the motor. The method of sum of power losses is based on the approach proposed...

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• Numerical Simulations of Hydrodynamic Open-Water Characteristics of a Ship Propeller

  Publikacja

  • J. Felicjancik
  • K. Sebastian
  • K. Felicjancik
  • K. Krzysztof

  - Polish Maritime Research - Rok 2016

  The paper presents the results of numerical simulations of ship propeller operation bearing the name of Propeller Open Water (POW) Tests. The object of tests was a sample ship propeller (PPTC1), the geometrical and kinematic data of which are available, along with the results of model tests, on the official page of the research centre involved in the measurements. The research aimed at verifying the correctness of results of numerical...

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• On power stream in motor or drive system

  Publikacja

  • Z. Paszota

  - Polish Maritime Research - Rok 2016

  In a motor or in a drive system the quantity of power increases in the direction opposite to the direction of power flow. Energy losses and energy efficiency of a motor or a drive system must be presented as functions of physical quantities independent of losses. Such quantities are speed and load. But the picture of power stream in a motor or in a drive system is presented in the literature in the form of traditional Sankey...

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Rok 2024

• 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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Rok 2006

• Investigation of motion of the lifeboat lowered from ship's deck

  Publikacja

  • C. Dymarski
  • M. Kraskowski
  • M. Sperski

  - Polish Maritime Research - Rok 2006

  W pracy przedstawiono model obliczeniowy oraz różniczkowe równania ruchu łodzi ratowniczej, opuszczanej z pokładu statku kołyszącego się na fali. Równania całkowano numerycznie. Opracowany na ich podstawie program komputerowy umożliwia wyznaczanie trajektorii oraz innych parametrów ruchu opusz¬czanej łodzi w funkcji czasu, dla różnych zadanych kołysań statku, a także obliczenie sił działających na łódź oraz znajdujących się...

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Rok 2013

• Losses and energy efficiency of drive motors and systems

  Publikacja

  • Z. Paszota

  - Polish Maritime Research - Rok 2013

  Losses and energy efficiency of every drive motor must be presented as functions of physical quantities independent of losses in the motor. Such quantities are speed and load required by the machine or device driven by the motor, changing in the drive operating field. Speed and load of the motor decide of the instantaneous useful power of the motor and also in a differentiated way of kinds and values of losses occurring in the...

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• Method of determining the degree of liquid aeration in a variable capacity displacement pump

  Publikacja

  • Z. Paszota

  - Polish Maritime Research - Rok 2013

  The Author concludes, that there is a possibility of determining a concrete value of the liquid aeration coefficient during the pump operation by finding such value of coefficient with which the increase of torque of mechanical losses is proportional to the indicated torque determined with a fixed value of increase of pressure in the pump working chambers. The fixed value of increase of pressure assumed in searching the liquid...

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• Multi-source-supplied parallel hybrid propulsion of the inland passenger ship STA.H. Research work on energy efficiency of a hybrid propulsion system operating in the electric motor drive mode

  Publikacja

  • W. Litwin
  • W. Leśniewski
  • J. Kowalski

  - Polish Maritime Research - Rok 2013

  In the Faculty of Ocean Engineering and Ship Technology, Gdansk University of Technology, design has recently been developed of a small inland ship with hybrid propulsion and supply system. The ship will be propelled by a specially designed so called parallel hybrid propulsion system. The work was aimed at carrying out the energy efficiency analysis of a hybrid propulsion system operating in the electric motor drive mode and at...

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• Multi-stage magnetic-fluid seals for operating in water - life test procedure, test stand and research results. Part II Results of life tests of multi-stage magnetic - fluid seal operating in water

  Publikacja

  • L. Matuszewski

  - Polish Maritime Research - Rok 2013

  The edge criteria for magnetic-fluid seals durability research were described in previous article [24] and now the tests results are presented. The tests were made with three magnetic fluids using various magnets quantity in magnetic assemblies. If values obtained in the repeated test deviated by more than 10 % from results of the first test an additional control test was made for final characteristics. The characteristics are:...

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Rok 2007

• Manoeuvring forces on azimuthing podded propulsor model

  Publikacja

  • M. Reichel

  - Polish Maritime Research - Rok 2007

  This paper presents the preliminary part of comprehensive manoeuvring open- water tests of a gas carrier model. The paper focuses on open water experiments with an azimuthing podded propulsor. The test program was carried out in the cavitation tunnel and the large towing tank of Ship Hydromechanics Division, Ship Design and Research Centre, Gdańsk. The pod was tested as a pushing unit with a 161.3 mm diameter propeller. Steering...

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Rok 2009

• On the modelling of aerodynamic force coefficients for over-shroud seals of turbine stages

  Publikacja

  • W. Włodarski
  • K. Kosowski

  - Polish Maritime Research - Rok 2009

  This paper presents experimental investigations which made it possible to determine dynamic coefficients of labyrinth over-shroud seal of a model air turbine. The coefficients associate pressure forces with turbine rotor displacement, velocity and acceleration respective to turbine casing (linear model) and play important role in analyzing turbine-set dynamics. The obtained results indicated that involving serious errors can be...

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• On the possible increasing of efficiency of ship power plant with the system combined of marine diesel engine, gas turbine and steam turbine at the main engine - steam turbine mode of cooperation

  Publikacja

  • M. Dzida

  - Polish Maritime Research - Rok 2009

  W pracy przedstawiono koncepcję układu kombinowanego okrętowego dużej mocy złożonego z silnika głównego tłokowego oraz skojarzonych z nim turbiny gazowej mocy i układu turbiny parowej, wykorzystujących energię zawartą w spalinach wylotowych silnika głównego tłokowego. Rozpatrywano układ kombinowany układ złożony z silnika spalinowego tłokowego skojarzony z układem turbiny parowej. Podano algorytm i obliczenia poszczególnych podukładów:...

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