Rok 2014

• Digital signal processing applied to the modernization of Polish Navy sonars

  Publikacja

  • J. Marszal

  - Polish Maritime Research - Rok 2014

  The article presents the equipment and digital signal processing methods used for modernizing the Polish Navy’s sonars. With the rapid advancement of electronic technologies and digital signal processing methods, electronic systems, including sonars, become obsolete very quickly. In the late 1990s a team of researchers of the Department of Marine Electronics Systems, Faculty of Electronics, Telecommunications and Informatics, Gdansk...

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• Computational simulation of motion of a rescue module during its launching from ship at rough sea

  Publikacja

  • C. Dymarski
  • P. Dymarski

  - Polish Maritime Research - Rok 2014

  This paper is a continuation of the work titled : “A comp utational model for simulation of motion of rescue module during its launching from stern ramp of a ship at rough sea”. It presents results of computer simulations of motion of a rescue module with embarked persons during its launching on rollers along stern ramp of a ship at rough sea. The simulations were conducted for a selected ship fitted with a launching ramp , for...

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• CFD and FEM model of an underwater vehicle propeller

  Publikacja

  • T. Chruściel
  • E. Ciba
  • J. Dopke

  - Polish Maritime Research - Rok 2014

  During the project execution of design and optimization the Remotely Operated Vehicle (ROV) research on its propulsion has been carried out. The entire project was supported by CFD and FEM calculations, which taking into account the characteristics of underwater vehicle. One of the tasks was to optimize the semi-open duct for horizontal propellers, which provided propulsion and controllability in horizontal plane. In order to...

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Rok 2019

• Diagnostic Model of Crankshaft Seals

  Publikacja

  • P. Bzura

  - Polish Maritime Research - Rok 2019

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

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

  Publikacja

  • P. Dymarski

  - Polish Maritime Research - Rok 2019

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

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

  Publikacja

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

  - Polish Maritime Research - Rok 2019

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

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Rok 2021

• 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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• 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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Rok 2023

• 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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• 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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• 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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Rok 2003

• Deterministic and probabilistic interpretation of operation of technicalsystems with regard to their reliability

  Publikacja

  • J. Girtler

  - Polish Maritime Research - Rok 2003

  Zaproponowano interpretację wartościującą działanie, które jest rozpatrywane jako wielkość fizyczna o jednostce miary zwanej dżulosekundą [dżulxsekunda]. Tak rozumiane działanie przedstawiono w ujęciu technicznym. Zaproponowano oryginalną metodę analizy i oceny działania dowolnego systemu technicznego z uwzględnieniem jego niezawodności. Szczególną uwagę zwrócono na interpretację działania silnika o zapłonie samoczynnym. Do uzasadnienia...

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Rok 2020

• DETERMINATION OF SEAKEEPING PERFORMANCE FOR A CASE STUDY VESSEL BY THE STRIP THEORY METHOD

  Publikacja

  • K. Niklas
  • A. Karczewski

  - Polish Maritime Research - Rok 2020

  The increase of seakeeping performance is of particular importance for car and passenger ferries, service ships in the gas and oil extraction industry and offshore wind power farm industry, as well as for special purpose ships (including military applications). In the water areas of the Baltic Sea, North Sea, and Mediterranean Sea, which are characterised by a short and steep wave, the hull shape has a substantial impact on the...

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• DETERMINATION OF ADDITIONAL TENSION IN TOWED STREAMER CABLE TRIGGERED BY COLLISION WITH UNDERWATER MOVING OBJECT

  Publikacja

  • V. Blintsov
  • K. Trunin
  • W. Tarełko

  - Polish Maritime Research - Rok 2020

  The paper deals with issues connected with the behaviour of a streamer cable towed by a survey seismic vessel when the cable undergoes a strike triggered by collision with an underwater moving object. The consequences of such collisions may be both threat to the life of marine animals or damage to underwater units and large economic losses suffered by vessel owners. The risk of such collisions has increased over the last years...

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• DESIGN ANALYSIS OF HYBRID GAS TURBINE - FUEL CELL POWER PLANT IN STATIONARY AND MARINE APPLICATIONS

  Publikacja

  • T. Kwaśniewski
  • M. Piwowarski

  - Polish Maritime Research - Rok 2020

  The paper concerns design analysis of a hybrid gas turbine power plant with a fuel cell (stack). The aim of this work was to find the most favorable variant of the medium capacity (approximately 50 MW) hybrid system. In the article, computational analysis of two variants of such a system was carried out. The analysis let to calculate capacity, efficiency of both variants and other parameters like flu gas temperature. The paper...

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• Cargo ships heat demand - operational experiment

  Publikacja

  • D. Bocheński
  • D. Kreft

  - Polish Maritime Research - Rok 2020

  The paper presents the results of an experiment conducted on two cargo ships – a 5300 TEU container with a steam heating system and a 7500 dwt general cargo ship with a thermal oil system. On both ships research has been carried out using specially designed measuring equipment. After gathering data about flow velocity and temperatures (steam/ cooling water/ thermal oil/ seawater/ outside air), calculations have been done, resulting...

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Rok 2008

• Detection of ferromagnetic objects in local magnetic anomaly of the Baltic Sea

  Publikacja

  • M. Wołoszyn

  - Polish Maritime Research - Rok 2008

  In geological researches several kinds of methods are applied to discovering the natural resources. Planes, helicopters and UAVs (UnmAnned Vehicle) are used in researches in large areas. The gravity, electromagnetic and magnetic methods, which are used in geological researches, are presented in this paper. The special attention was paid to magnetic systems installed on mobile platforms. The magnetic field of the Earth obtained...

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Rok 2015

• DESIGN OF THE DUAL CONSTELLATION GPS/GALILEO MOBILE DEVICE FOR IMPROVING NAVIGATION OF THE VISUALLY IMPAIRED IN AN URBAN AREA, POLISH MARITIME RESEARCH

  Publikacja

  • K. Drypczewski
  • M. Moszyński
  • J. Demkowicz
  • K. Bikonis
  • A. Stepnowski

  - 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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• DESIGN OF THE DUAL CONSTELLATION GPS/GALILEO MOBILE DEVICE FOR IMPROVING NAVIGATION OF THE VISUALLY IMPAIRED IN AN URBAN AREA

  Publikacja

  • K. Drypczewski
  • M. Moszyński
  • J. Demkowicz
  • K. Bikonis
  • A. Stepnowski

  - Polish Maritime Research - Rok 2015

  It is well known by users of Personal Navigation Device (PND) and other GPS-based devices that positioning suffers from (local) significant decreases of accuracy in partially obscured environments like urbanized areas, where buildings (especially high buildings), trees or terrain block large portions of the sky. In such areas, GPS receiver performance is usually deteriorated by the reduced number of currently available satellite...

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• DESIGN AND STRENGTH CALCULATIONS OF THE TRIPOD SUPPORT STRUCTURE FOR OFFSHORE POWER PLANT

  Publikacja

  • C. Dymarski
  • P. Dymarski
  • J. Żywicki

  - Polish Maritime Research - Rok 2015

  The support structure being the object of the analysis presented in the article is Tripod. According to the adopted assumptions, it is a foundation gravitationally set in the water region of 60 m in depth, not fixed to the seabed, which can be used for installing a 7MW wind turbine. Due to the lack of substantial information on designing and strength calculations of such types of structures in the world literature, authors have...

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• Comparison of the powers of energy losses in a variable capacity displacement pump determined without or with taking into account the power of hydraulic oil compression

  Publikacja

  • Z. Paszota

  - Polish Maritime Research - Rok 2015

  Powers of energy losses in a variable capacity displacement pump are compared with or without taking into account the power of hydraulic oil compression. Evaluation of power of liquid compression in the pump was made possible by the use of method, proposed by the Author, of determining the degree of liquid aeration in the pump. In the method of determining the liquid aeration in the pump and of powers of volumetric losses of liquid...

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Rok 2017

• Design of Structure of Tension Leg Platform for 6 MW Offshore Wind Turbine Based On Fem Analysis

  Publikacja

  • J. Żywicki
  • P. Dymarski
  • E. Ciba
  • C. Dymarski

  - Polish Maritime Research - Rok 2017

  The article presents the calculation and design stages of the TLP platform serving as a supporting construction of a 6 MW offshore wind turbine. This platform is designed to anchor at sea at a depth of 60 m. The authors presented the method of parameterization and optimization of the hull geometry. For the two selected geometry variants, the load and motion calculations of the platform subjected to wind, wave and current under...

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• Design Methodology for Small Passenger Ships On the Example of the Ferryboat Motława 2 Driven by Hybrid Propulsion System

  Publikacja

  • P. Gełesz
  • A. Karczewski
  • J. Kozak
  • W. Litwin
  • Ł. Piątek

  - Polish Maritime Research - Rok 2017

  Dynamic development in practically all elds of science and engineering has not passed over shipbuilding . In last years , engineers got to their use computer soware which makes it possible to perform strength and hydrodynamic calculations as well as to visualize design projects in 3 D space [1-4]. At their disposal they have full spectrum of modern solutions associated with the use of advanced materials and technologies [5-7]....

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• Corrosion fatigue crack propagation rate characteristics for weldable ship and offshore steels with regard to the influence of loading frequency and seawater temperature

  Publikacja

  • M. Jakubowski

  - Polish Maritime Research - Rok 2017

  After Vosikovsky (1975), the corrosion fatigue crack growth rate (CFCGR) characteristics have been divided into three regions. The region-III rates are very close to mechanical fatigue crack growth rates. CFCGR formulae, including the long-crack length effect (in region I only), the loading frequency effect (in region II only), and the saltwater temperature effect, have been proposed. It has been assumed that CFCGR is proportional...

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• Composite GFRP U-shaped footbridge

  Publikacja

  • J. Chróścielewski
  • M. Miśkiewicz
  • Ł. Pyrzowski
  • K. Wilde

  - Polish Maritime Research - Rok 2017

  The paper presents proposals for the use of glass fiber reinforced polymer composites for the construction of engineering objects, known and commonly used in the shipbuilding industry. An example of a pedestrian footbridge was used in this case, which, despite the considerable thickness of the structural material, was made using infusion technology in one production cycle. The designed and produced footbridge span is durable, dynamically...

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• Comparison of soil models in the thermodynamic analysis of a submarine pipeline buried in seabed sediments

  Publikacja

  • W. Magda

  - Polish Maritime Research - Rok 2017

  This paper deals with mathematical modelling of a seabed layer in the thermodynamic analysis of a submarine pipeline buried in seabed sediments. The existing seabed soil models: a “soil ring” and a semi-infinite soil layer are discussed in a comparative analysis of the shape factor of a surrounding soil layer. The meaning of differences in the heat transfer coefficient of a soil layer is illustrated based on a computational example...

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• Comparative Study of Machining Technology Selection to Manufacture Large-Size Components of Offshore Constructions

  Publikacja

  • M. Deja
  • M. Siemiątkowski
  • P. Sender

  - Polish Maritime Research - Rok 2017

  The focus of this paper is on process planning for large parts manufacture in systems of definite process capabilities, involving the use of multi-axis machining centres. The analysis of machining heavy mechanical components used in off-shore constructions has been carried out. Setup concepts applied and operation sequences determined in related process plans underwent studies. The paper presents in particular a reasoning approach...

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• CAUSALITY IN MODELS OF THERMAL PROCESSES IN SHIP ENGINE ROOMS WITH THE USE OF BOND GRAPH (BG) METHOD

  Publikacja

  • M. Cichy
  • Z. Kneba
  • J. Kropiwnicki

  - Polish Maritime Research - Rok 2017

  With a single approach to modeling elements of different physical nature, the method of Bond Graph (BG) is particularly well suited for modeling energy systems consisting of mechanical, thermal, electrical and hydraulic elements that operate in the power system engine room. The paper refers to the earlier presented new concept of thermal process modeling using the BG method. The authors own suggestions for determining causality...

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Rok 2016

• Design of OFDM-based radio communication systems for coast-to-sea and coast-to-air propagation environments

  Publikacja

  • S. Gajewski

  - Polish Maritime Research - Rok 2016

  In the paper the study of radio communication system design process for systems based on OFDM transmission is considered. The signal propagation model for 1.4 GHz frequency band is discussed, and the study of signal propagation characteristics, important from the point of view of OFDM system design, is presented. The methodology of OFDM interface design is proposed and some characteristics of the OFDM-based radio communication...

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• DEPTH IMAGES FILTERING IN DISTRIBUTED STREAMING

  Publikacja

  • T. Dziubich
  • J. Szymański
  • A. Brzeski
  • J. Cychnerski
  • W. Korłub

  - Polish Maritime Research - Rok 2016

  In this paper we discuss the comparison of point cloud filters focusing on their applicability for streaming optimization. For the filtering stage within a stream pipeline processing we evaluate three filters: Voxel Grid, Pass Through and Statistical Outlier Removal. For the filters we perform series of the tests aiming at evaluation of changes of point cloud size and transmitting frequency (various fps ratio). We propose a distributed...

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• Depth Images Filtering In Distributed Streaming

  Publikacja

  • T. Dziubich
  • J. Szymański
  • A. Brzeski
  • J. Cychnerski
  • W. Korłub

  - Polish Maritime Research - Rok 2016

  In this paper, we propose a distributed system for point cloud processing and transferring them via computer network regarding to effectiveness-related requirements. We discuss the comparison of point cloud filters focusing on their usage for streaming optimization. For the filtering step of the stream pipeline processing we evaluate four filters: Voxel Grid, Radial Outliner Remover, Statistical Outlier Removal and Pass Through....

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• Characterizing surface and air temperature in the Baltic Sea coastal area using remote sensing techniques and GIS

  Publikacja

  • A. Chybicki
  • M. Kulawiak
  • Z. Łubniewski

  - Polish Maritime Research - Rok 2016

  Estimation of surface temperature using multispectral imagery retrieved from satellite sensors constitutes several problems in terms of accuracy, accessibility, quality and evaluation. In order to obtain accurate results, currently utilized methods rely on removing atmospheric fluctuations in separate spectral windows, applying atmospheric corrections or utilizing additional information related to atmosphere or surface characteristics...

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Rok 2012

• Design of Inner Gate for CRIST Shipyard Dry Dock

  Publikacja

  • M. Bogdaniuk
  • Z. Górecki

  - Polish Maritime Research - Rok 2012

  The paper deals with a removable steel inner gate which was designed to separate two parts of a dry dock of about 70 m in width and 380 m in length. The gate allows for independent assembly of ship structures in two separated parts of the dock. The fore part of the dock can be flooded while the after part is dry. Tthe gate was designed by IDEK Company Ltd in 2011 and it was soon constructed and used by CRIST Shipyard in Gdynia.

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• Computational model for simulation of lifeboat motions during its launching from ship in rough seas

  Publikacja

  • C. Dymarski
  • P. Dymarski

  - Polish Maritime Research - Rok 2012

  W artykule przedstawiono model obliczeniowy 3 D, opisujący ruch obiektu w 6 stopniach swobody (6DoF), do symulacji ruchu jedno- lub dwuzawiesiowej łodzi ratunkowej lub ratowniczej podczas opuszczania ze statku na wzburzonej wodzie. Jest to złożony model uwzględniający warunki morskie oraz elastyczność i własności tłumiące elementów i mechanizmów żurawika, liny oraz kadłuba łodzi. Ponadto przedstawiono przykładowe wyniki obliczeń...

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Rok 2006

• Design concepts of propulsion and steering system for hotel unit of two-segment inland waterways ship

  Publikacja

  • C. Dymarski
  • R. Rolbiecki

  - Polish Maritime Research - Rok 2006

  W artykule przedstawiono założenia projektowe i dwa rozwiązania koncepcyjne napędu i sterowania barki hotelowej, stanowiącej część dwusegmentowego statku śródlądowego i przybrzeżnego. Obydwa rozwiązania oparto na zastosowaniu dziobowego śrubosteru małej mocy, ze śrubą stałą umieszczoną w dyszy obrotowej. W jednym z rozwiązań śruba napędzana jest silnikiem hydraulicznym, zaś w drugim - silnikiem elektrycznym. Mechanizm obrotu kolumny...

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• Design concept of a modular stage - stop - over terminal for inland waterways passenger transport on East - West routes

  Publikacja

  • M. Stawicka-Wałkowska
  • B. Felski
  • M. Ptaszyński
  • A. Szumilas

  - Polish Maritime Research - Rok 2006

  Centralne położenie Wisły i jej dorzecza w europejskim systemie wodnym, pozwala na włączenie jej do układu komunikacji wodnej Wschód - Zachód. Pozwoli to na wdrożenie systemu wodnego do celów transportu towarów ale również na wykorzystanie walorów krajobrazowo-kulturowych przyległych terenów do celów turystycznych.W oparciu o projekt nowo projektowaniej jednostki wodnej dostosowanej do śródlądowego transportu wodnego, rozważano...

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• Comparative analysis of selected design variants of propulsion system for an inland waterways ship

  Publikacja

  • C. Dymarski
  • R. Rolbiecki

  - Polish Maritime Research - Rok 2006

  W pracy zaprezentowano założenia projektowe i wstępną analizę porównawczą dwóch wariantów napędu śródlądowego statku pasażerskiego. Pierwsze rozwiązanie to wariant z przekładnią elektryczną, drugie natomiast, to wariant z przekładnią hydrostatyczną.

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Rok 2009

• Design analysis of turbines for co-generating micro-power plant working in accordance with organic Rankine's cycle

  Publikacja

  • J. Mikielewicz
  • M. Piwowarski
  • K. Kosowski

  - Polish Maritime Research - Rok 2009

  Przedstawiono wyniki analizy projektowej turbin dla mikrosiłowni kogeneracyjnej pracującej według organicznego obiegu Rankine'a z wykorzystaniem biopaliwa. Rozważono zakres mocy cieplnej od 25kW do 100kW, któremu odpowiadała możliwa do uzyskania moc elektryczna od 2kW do 12kW. Przeanalizowano projekty turbin osiowych (jedno- i wielostopniowych, także z częściowym zasilaniem), turbin promieniowych i promieniowo-osiowych. Porównano...

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• Design analysis of Tesla micro-turbine operating on a low-boiling medium

  Publikacja

  • P. Lampart
  • K. Kosowski
  • M. Piwowarski
  • Ł. Jędrzejewski

  - Polish Maritime Research - Rok 2009

  This paper presents results of the design analysis of a Tesla bladeless turbine intended for a co-generating micro-power plantof heat capacity 20 kW, which operates in an organic Rankine cycle on a low-boiling medium. Numerical calculations of flowin several Tesla turbine models were performed for a range of design parameters. Results of investigations exhibit interestingfeatures in the distribution of flow parameters within the...

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Rok 2013

• Design analysis of ORC micro-turbines making use of thermal energy of oceans

  Publikacja

  • M. Piwowarski

  - Polish Maritime Research - Rok 2013

  The article presents the results of the analysis of energy conversion cycles making use of thermal energy of oceans. The objects of analysis were two cases of closed Organic Rankine Cycle (ORC) power plants, which were: the cycle in which the vapour of the working medium was produced by warm oceanic water in the circum-equatorial zone, and the so-called “arctic” cycle in which this vapour was produced by non-frozen water in the circumpolar...

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• Critical review of propeller performance scaling methods based on model experiments and numerical calculations

  Publikacja

  • T. Bugalski
  • J. Szantyr
  • H. Streckwall

  - Polish Maritime Research - Rok 2013

  The article presents the results of experimental and theoretical investigation of propeller scale effects. The objective of this investigation is to test the adequacy of the methods currently used and to develop possible improvement of the methods.New approaches to the problem and new procedures to account for the propeller scale effects are suggested. The description of the underlying experimental and theoretical research is included.

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• Comparative analysis of the theoretical models of ideal propulsor, ideal fluid brake, ideal screw propeller and ideal axial wind turbine

  Publikacja

  • T. Koronowicz
  • J. Szantyr

  - Polish Maritime Research - Rok 2013

  The article presents a detailed discussion of four different fluid dynamics devices.These devices are presented with all relevant mathematical formulae regarding the forces, the power and the efficiency. It is demonstrated that application of the Betz theorem to axial wind turbines is not correct and it underestimates the maximujm achievable efficiency. This conclusion is supported by numerical calculations.

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Rok 2018

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

  Publikacja

  • M. Niedostatkiewicz

  - Polish Maritime Research - Rok 2018

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

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

  Publikacja

  • A. Karczewski
  • J. Kozak

  - Polish Maritime Research - Rok 2018

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

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

  Publikacja

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

  - Polish Maritime Research - Rok 2018

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

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

  Publikacja

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

  - Polish Maritime Research - Rok 2018

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

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• COLD CRACKING OF S460N STEEL WELDED IN WATER ENVIRONMENT

  Publikacja

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

  - Polish Maritime Research - Rok 2018

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

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Rok 2007

• Concept of implementation of open water model tests for assessment of safety of ships in damaged conditions

  Publikacja

  • M. K. Gerigk (dawniej: M. Gerigk)

  - Polish Maritime Research - Rok 2007

  Praca zawiera opis koncepcji zastosowania badań modelowych na wodach otwartych w odniesieniu do oceny bezpieczeństwa statków w stanie uszkodzonym. Badania modelowe w omawianym zakresie mogą stanowić alternatywną metodę oceny bezpieczeństwa statków w stanie uszkodzonym lub mogę służyć do weryfikacji oceny bezpieczeństwa statków w stanie uszkodzonym, przeprowadzonej za pomocą metody zawartej w zharmonizowanej wersji konwencji SOLAS...

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Rok 2010

• Comparing N3-60 cascade exit angles obtained from tunnel measurements and numerical calculations

  Publikacja

  • R. Biernacki
  • P. Krzyślak

  - Polish Maritime Research - Rok 2010

  The article compares the results of measurements performed in the aerodynamic tunnel at CUT and numerical simulation carried out for a plane cascade of N3-60 profiles. Comparing the measured and calculated results provides opportunities for assessing the range of systematic differences between simulation predictions and actual experimental results.

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Rok 2011

• Comparing combined gas tubrine/steam turbine and marine low speed piston engine/steam turbine systems in naval applications

  Publikacja

  • M. Dzida
  • W. Olszewski

  - Polish Maritime Research - Rok 2011

  Porównano układy napędowe okrętowe kombinowane turbina gazowa- turbina parowa oraz spalinowy okrętowy silnik tłokowy wolnoobrotowy - turbina parowa. Porównywano moce oraz zużycie paliwa oraz parametry pary świeżej układu turbiny parowej.

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