Rok 2017

• 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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• 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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• 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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• 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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• 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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• 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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• Effect of Different Structure Type Traffic On Railway Line Capacity

  Publikacja

  • S. Grulkowski
  • J. Zariczny
  • R. Gleba

  - Polish Maritime Research - Rok 2017

  The article points to methods of analyzing railway traffic conditions based on two parameters: capacity and delay of trains. The impact of the differentiated railway type structure on the capacity of the railway line was presented. Particular attention has been paid to the assessment of commonly used simplifications in analyzes.

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• ENERGY EFFICIENT AND ENVIRONMENTALLY FRIENDLY HYBRID CONVERSION OF INLAND PASSENGER VESSEL

  Publikacja

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

  - Polish Maritime Research - Rok 2017

  The development and growing availability of modern technologies, along with more and more severe environment protection standards which frequently take a form of legal regulations, are the reason why attempts are made to find a quiet and economical propulsion system not only for newly built watercraft units, but also for modernised ones. Correct selection of the propulsion and supply system for a given vessel affects significantly...

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• Environmental aspects of coastal earth structures made of soil-ash composites

  Publikacja

  • R. Ossowski

  - Polish Maritime Research - Rok 2017

  This paper presents an innovative technology of building the coastal dams with the use of soil-ash composites. A natural- scale test stand and results of the performed environmental tests are presented ; they have been compared with standards for purity of soils and waters. Also, an analysis of the obtained results and discussion of trends and anomalies in the observations, are given.

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• FAILURE OF MAGNETIC FLUID SEALS OPERATING IN WATER: PRELIMINARY CONCLUSIONS

  Publikacja

  • L. Matuszewski

  - Polish Maritime Research - Rok 2017

  The article analyses properties of magnetic fluid seals installed in rotary sealing no des which operate in the utility water environment. Seals of this type have been examined as a possible solution to the problem with ship manoeuvring propulsion sealing. The present analysis bases on laboratory durability tests of magnetic fluid seals expo sed to long - term utility water loads, at different water pressures and shaft revolutions....

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• Features of load and wear of main propulsion devices on sea-going ships with piston combustion engines and their impact on changes in technical states of the systems

  Publikacja

  • J. Girtler

  - Polish Maritime Research - Rok 2017

  The paper presents the specificity of operation of propulsion systems of seagoing ships which causes the need to control the load on them, especially on their engines called main engines. The characteristics of the load on the propulsion systems, especially on the main engines as well as on the shaft lines and propellers driven by the engines, along with the process of wear in tribological joints (sliding tribological systems)...

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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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• Exhaust gas temperature measurements in diagnostic examination of naval gas turbine engines. Part I: Steady-state processes

  Publikacja

  • Z. Korczewski

  - Polish Maritime Research - Rok 2011

  The article presents a possible method of detecting failures in the flow section and supply system of a naval gas turbine engine based on the exhaust gas temperature measured behind the gas generator. This temperature is a basic diagnostic parameter use for evaluating the technical state of the turbine engine in operation, and is monitored during engine start-ups, accelerations and decelerations of rotor units, and steady-load...

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• Exhaust gas temperature measurements in diagnostic examination of naval gas turbine engines. Part II. Unsteady processes

  Publikacja

  • Z. Korczewski

  - Polish Maritime Research - Rok 2011

  The second part of the article presents the results of operating diagnostic tests of a two- and three-shaft engine with a separate power turbine during the start-up and acceleration of the rotor units. Attention was paid to key importance of the correctness of operation of the automatic engine load control system, the input for which, among other signals, is the rate of increase of the exhaust gas flow temperature. The article...

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• Exhaust gas temperature measurements in diagnostic examination of naval gas turbine engines. Part III. Diagnostic and operating tolerances

  Publikacja

  • Z. Korczewski

  - Polish Maritime Research - Rok 2011

  The third part of the article presents a method for detecting failures of the automatic engine control system with the aid of an exhaust gas temperature setter, specially designed and machined for this purpose. It also presents a procedure of identifying the operating tolerances and determining the diagnostic tolerances for the exhaust gas temperature recorded in the naval turbine engine during the start-up and acceleration processes....

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• Fatigue strength determination of ship structural joints. Part I - Analytical methods for determining fatigue strength of ship tructures

  Publikacja

  • J. Kozak
  • Z. Górski

  - Polish Maritime Research - Rok 2011

  Spectacular accidents at sea which have happened for a few last years show that hull structures of contemporary sea-going ships are not perfect and must be systematically improved. Fatigue strength is one of the groups of strength problems which affect design of contemporary ship's structures and greatly contribute in their improvement process. In this paper several approaches to estimation of fatigue life of hull structural...

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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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• Energy losses in the hydraulic rotational motor - definitions and relations for evaluation of the efficiency of motor and hydrostatic drive

  Publikacja

  • Z. Paszota

  - Polish Maritime Research - Rok 2010

  Stosowane dotychczas w badaniach naukowych i w praktyce przemysłowej metody oceny strat i sprawności energetycznej obrotowych silników hydraulicznych stosowanych w napędach hydrostatycznych dają błędne rezultaty, ponieważ obarczone są wpływem samych strat na parametry, w funkcji których straty i sprawności są oceniane.Celem pracy było zdefiniowanie w silniku parametrów pracy, rozwijanych mocy, występujących strat i sprawności energetycznej...

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• Entropy function application within the selection process of diagnostic parameters of marine diesel and gas turbine engines

  Publikacja

  • Z. Korczewski

  - Polish Maritime Research - Rok 2010

  The paper presents the method of conducting an analysis of the diagnostic informativeness among the parameters characterizing the observed gas dynamic processes carried out within working spaces of marine diesel and gas turbine engines. An entropy function, as the measure of uncertainty of the identified states' set of the engine unfitness was applied. Having evaluated the diagnostic information the most adequate parameters were...

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• Evaluation of losses in a hydraulic motor based on the SWSB - 63 motor tests

  Publikacja

  • A. Maczyszyn

  - Polish Maritime Research - Rok 2010

  In this paper are compared two models of energy losses: that suggested by Prof. Paszota,Z. in monograph "Energy losses in the hydraulic displacement motors - definitions and relations serving the evaluation of the efficiency of hydrostatic drive" [18] and that ofProf. Balawender, A. in "Energy analysis and methodology of testing of low-speed hydraulic motors" [1]. By using the data obtained from the tests of SWSB-63 hydraulic motors...

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Rok 2018

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

  Publikacja

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

  - Polish Maritime Research - Rok 2018

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

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

  Publikacja

  • A. Karczewski
  • J. Kozak

  - Polish Maritime Research - Rok 2018

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

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

  Publikacja

  • M. Niedostatkiewicz

  - Polish Maritime Research - Rok 2018

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

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

  Publikacja

  • A. Witkowska
  • T. Niksa-Rynkiewicz

  - Polish Maritime Research - Rok 2018

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

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

  Publikacja

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

  - Polish Maritime Research - Rok 2018

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

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

  Publikacja

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

  - Polish Maritime Research - Rok 2018

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

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• EXPERIMENTAL AND NUMERICAL VALIDATION OF THE IMPROVED VORTEX METHOD APPLIED TO CP745 MARINE PROPELLER MODEL

  Publikacja

  • P. Król
  • K. Tesch

  - Polish Maritime Research - Rok 2018

  The article presents a numerical analysis of the CP745 marine propeller model by means of the improved vortex method and CFD simulations. Both numerical approaches are validated experimentally by comparing with open water characteristics of the propeller. The introduced modification of the vortex method couples the lifting surface approach for the propeller blades and the boundary element method for the hub. What is more, a...

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• FEM ANALYSIS AND EXPERIMENTAL TESTS OF RIGID RISER HANGING SYSTEM

  Publikacja

  • A. Olszewski
  • M. Wodtke
  • A. Wójcikowski

  - Polish Maritime Research - Rok 2018

  The article presents the analysis, project, and experimental examination of an original rigid riser for Coil Tubing Pipes. The principle of riser operation is based on the use of friction forces. The research included the FEM analysis of the designed riser, calculations of the required bolt tensions, and checking the effect of the clamping force on stress distribution in the pipeline. The results of computer simulation were verified...

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• FEM Calculations in Analysis of Steel Subsea Water Injection Flowlines Designing Process

  Publikacja

  • M. Wodtke
  • A. Olszewski
  • A. Wójcikowski

  - Polish Maritime Research - Rok 2018

  Paper describes the result of theoretical research aimed at assessing the loads and operating conditions of a Coiled Tubing pipeline injecting water, suspended to the mining platform of Lotos Petrobaltic. For this purpose, appropriate calculation models have been developed using the Finite Element Method (FEM), taking into account the nature of the analyzed object and its loads. The analyzes were carried out for two pipes (previously...

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Rok 2015

• 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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• 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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• 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 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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• Exhaust gas temperature measurements in diagnostics of turbocharged marine internal combustion engines. Part I. Standard measurements.

  Publikacja

  • Z. Korczewski

  - Polish Maritime Research - Rok 2015

  The article discusses the problem of diagnostic informativeness of exhaust gas temperature measurements in turbocharged marine internal combustion engines. Theoretical principles of the process of exhaust gas flow in turbocharger inlet channels are analysed in its dynamic and energetic aspects. Diagnostic parameters are defined which enable to formulate general evaluation of technical condition of the engine based on standard...

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Rok 2012

• 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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• 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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• Effect of the working liquid compressibility on the picture of volumetric and mechanical losses in a high pressure displacement pump used in a hydrostatic drive. Part I Energy losses in a drive system, volumetric losses in a pump

  Publikacja

  • Z. Paszota

  - Polish Maritime Research - Rok 2012

  Ściśliwość cieczy roboczej może znacząco zmienić wartości i proporcje współczynników strat objętościowych i mechanicznych w pompie wyporowej zastosowanej w układzie napędu hydrostatycznego. Wpływ ten jest szczególnie widoczny w trakcie pracy pod wysokim ciśnieniem a także wówczas, gdy występuje zapowietrzenie cieczy roboczej. W części I przedstawiono wykres zaproponowany przez autora, wzrostu mocy w układzie napędu hydrostatycznego...

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• Effect of the working liquid compressibility on the picture of volumetric and mechanical losses in a high pressure displacement pump used in a hydrostatic drive Part II Mechanical losses in a pump

  Publikacja

  • Z. Paszota

  - Polish Maritime Research - Rok 2012

  Ściśliwość cieczy roboczej może znacząco zmienić wartości i proporcje współczynników strat objętościowych i mechanicznych w pompie wyporowej zastosowanej w układzie napędu hydrostatycznego. Wpływ ten jest szczególnie widoczny w trakcie pracy pod wysokim ciśnieniem a także wówczas, gdy występuje zapowietrzenie cieczy roboczej. W części II przedstawiono model matematyczny momentu strat mechanicznych w pompie oraz jego laboratoryjną...

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• Evolutionary approach to ship's trajectory planning within Traffic Separation Schemes

  Publikacja

  • R. Szłapczyński

  - Polish Maritime Research - Rok 2012

  The paper presents the continuation of the author's research on evolutionary approach to ship trajectory planning. While the general problem of the evolutionary trajectory planning has already been solved, no one has yet touched one of its specific aspects: evolutionary trajectory planning within Traffic Separation Schemes. Traffic Separation Scheme (TSS) is a traffic-management route-system complying with rules of the International...

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Rok 2014

• 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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• 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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• Effect of microstructure on mechanical properties and corrosion resistance of 2205 duplex stainless steel

  Publikacja

  • J. Łabanowski
  • A. Świerczyńska
  • S. Topolska

  - Polish Maritime Research - Rok 2014

  This paper presents results of the research on impact of microstructure of austenitic-ferritic steel of duplex type on its mechanical properties and susceptibility to stress corrosion cracking. As showed, improper processing technologies more and more often used in shipbuilding industry for plates and other half-finished products made of duplex steel may cause significant lowering their properties, which frequently makes their...

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• Evolutionary sets of safe ship trajectories with speed reduction manoeuvres within traffic separation schemes

  Publikacja

  • R. Szłapczyński

  - Polish Maritime Research - Rok 2014

  In the previous paper the author presented the evolutionary ship trajectory planning method designed to support Traffic Separation Schemes (TSS). This time the extensions of this method are described which allow to combine evolutionary trajectory planning with speed reduction manoeuvres. On TSS regions with higher than usual density of traffic and smaller distances between ships, the course alterations alone are not always sufficient...

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• Flow of liquid in flat gaps of the satellite motor working mechanism

  Publikacja

  • P. Śliwiński

  - Polish Maritime Research - Rok 2014

  The article describes the methodology and results of investigations of the flow of oil and HFA-E emulsion in flat gaps of the working mechanism of a satellite motor. The flow of liquid in those gaps is turbulent and not fully developed. The article presents two methods of modelling this flow. Method I makes use of the Darcy-Weisbach formula, while Method II bases on the assumption that in the variable-length gaps the flow is turbulent...

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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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• Dynamic interaction of the cavitating propeller tip vortex with the rudder

  Publikacja

  • J. Szantyr

  - Polish Maritime Research - Rok 2007

  Praca przedstawia model teoretyczny i obliczeniowy dynamicznego oddziaływania kawitującego wiru wierzchołkowego śruby okrętowej z płetwą sterową. W wyniku oddziaływania zmienia się geometria wiru, powodując generowanie wysokich pulsacji ciśnienia w otaczającej wodzie i na kadłubie okrętu. Wyniki obliczeń skonfrontowano z rezultatami pomiarów laboratoryjnych na modelach. Pokazano praktyczną przydatność modelu obliczeniowego do projektowania...

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• Experimental research on effectiveness of the magnetic fluid seals for rotary shafts working in water

  Publikacja

  • L. Matuszewski
  • Z. Szydło

  - Polish Maritime Research - Rok 2007

  Uszczelnianie wałów obrotowych, łożysk i innych zespołów mechanicznych, za pomocą cieczy magnetycznej, tworzącej przegrodę uszczelniającą utrzymywaną siłami pola magnetycznego jest techniką uszczelniania, stosowaną z powodzeniem w urządzeniach pracujących w środowisku gazowym przy ciśnieniu do około 1,0 MPa. Uszczelnienia te umożliwiają również skuteczne rozwiązywanie problemu szczelności przepustów stałych i ruchowych w urządzeniach...

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Rok 2013

• 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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• 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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• Gdansk Bay sea bed sounding and classification of its results

  Publikacja

  • G. Grelowska
  • E. Kozaczka
  • S. Kozaczka

  - Polish Maritime Research - Rok 2013

  The main goal of this paper is to describe the results of sounding the Gdansk Bay sea bed by using a SES-2000 Standard parametric sub-bottom profiler. Quality of data obtained during trials depends inter alia on a proper location of transducer array to reduce influence of pitch, roll and heave motions as well as ship self noise (resulting from bubbles due to propeller and flow around hull, vibration generated by main engine and...

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Rok 2016

• 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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• 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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• 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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• Effective method for determining environmental loads on supporting structures for offshore wind turbines

  Publikacja

  • P. Dymarski
  • E. Ciba
  • T. Marcinkowski

  - Polish Maritime Research - Rok 2016

  This paper presents a description of an effective method for determining loads due to waves and current acting on the supporting structures of the offshore wind turbines. This method is dedicated to the structures consisting of the cylindrical or conical elements as well as (truncates) pyramids of polygon with a large number of sides (8 or more). The presented computational method is based on the Morison equation, which was originally...

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• EXHAUST GAS TEMPERATURE MEASUREMENTS IN DIAGNOSTICS OF TURBOCHARGED MARINE INTERNAL COMBUSTION ENGINES PART II DYNAMIC MEASUREMENTS

  Publikacja

  • Z. Korczewski

  - Polish Maritime Research - Rok 2016

  The second part of the article describes the technology of marine engine diagnostics making use of dynamic measurements of the exhaust gas temperature. Little-known achievements of Prof. S. Rutkowski of the Naval College in Gdynia (now: Polish Naval Academy) in this area are presented. A novel approach is proposed which consists in the use of the measured exhaust gas temperature dynamics for qualitative and quantitative assessment...

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Rok 2020

• 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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• 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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• 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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• ENERGY ANALYSIS OF THE PROPULSION SHAFT FATIGUE PROCESS IN A ROTATING MECHANICAL SYSTEM PART II IDENTIFICATION STUDIES – DEVELOPING THE FATIGUE DURABILITY MODEL OF A DRIVE SHAFT

  Publikacja

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

  - Polish Maritime Research - Rok 2020

  The article presents a continuation of research carried out concerning identification of energy consequences of mechanical fatigue within a propeller shaft in a rotating mechanical system, while working under conditions of the loss of the required alignment of shaft lines. Experimental research was carried out on a physical model reflecting a full-sized real object: i.e., the propulsion system of the ship. It is proven, by means...

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• EVOLUTIONARY MULTI–OBJECTIVE WEATHER ROUTING OF SAILBOATS

  Publikacja

  • E. Sobecka
  • R. Szłapczyński
  • M. Życzkowski

  - Polish Maritime Research - Rok 2020

  The paper presents a multi-objective method, which optimises the route of a sailboat. The presented method makes use of an evolutionary multi-objective (EMO) algorithm, which performs the optimisation according to three objective functions: total passage time, a sum of all course alterations made during the voyage and the average angle of heel. The last two of the objective functions reflect the navigator’s and passenger’s comfort,...

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• Experimental and numerical investigations of ultimate strength of imperfect stiffened plates of different slenderness

  Publikacja

  • K. Wołoszyk
  • Y. Garbatov
  • J. Kowalski
  • L. Samson

  - Polish Maritime Research - Rok 2020

  The objective of this study is to analyse the behaviour of compressed stiffened plates of different slenderness using experimental and numerical methods. The presented results are part of a long-term project to investigate the ultimate strength of geometrically imperfect structures subjected to different degradation phenomena, including corrosion degradation and locked cracks. Several specimens were subjected to a uniaxial compressive...

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• Experimental Research on Insufficient Water Lubrication of Marine Stern Tube Journal Bearing with Elastic Polymer Bush

  Publikacja

  • A. Barszczewska

  - Polish Maritime Research - Rok 2020

  Water-lubricated bearings with polymer bushes are steadily gaining popularity due to their advantages, including environmental friendliness, relatively simple construction and long-term operation. Nevertheless, in practice instances of damage to such bearings occur due to insufficient or absent flow of the lubricating agent. In this study, experimental tests established that elastic polymer bush bearing is capable of operating...

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Rok 2009

• 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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• 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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• Evaluation of technical efficiency of heat and electric power generation

  Publikacja

  • H. Piwowarska
  • M. Piwowarski

  - Polish Maritime Research - Rok 2009

  This paper presents an evaluation of technical efficiency and time-dependent changes in productivity of Polish professional electric power and heat&electric power stations by using Data Envelopment Analysis non-parametric method. The research covered the enterprises whose total available electric power amounted to about 98% of that of all professional thermal electric power stations in this country. The analysis has concerned...

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Rok 2006

• 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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• 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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• Economical analysis of selected variants of power plant for inland waterways passenger ship intended for operating on Berlin-Kaliningrad route

  Publikacja

  • D. Bocheński

  - Polish Maritime Research - Rok 2006

  W artykule przedstawiono analizę ekonomiczną trzech wariantów siłowni śródlądowego statku pasażerskiego przeznaczonego na trasę Berlin-Królewiec. Określono koszty inwestycyjne oraz koszty zużycia paliwa przez porównywalne siłownie. Wykorzystano wskaźniki ekonomiczne: AAC oraz NPV.

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• Fatigue life of steel, laser welded panels

  Publikacja

  • J. Kozak

  - Polish Maritime Research - Rok 2006

  W publikacji przedstawiono zagadnienia dotyczące możliwości analizy trwałości zmęczeniowej stalowyxh paneli spawanych laserowo typu sandwich. Przedstawiono wyniki badań laboratoryjnych w skali naturalnej a także krzywe projektowe uzyskane na podstawie systematycznych badań połączeń elementarnych spawanych laserowo. Na podstawie przedstawionych i uogólnionych wyników pokazano propozycję metodyki szacowania trwałości zmęczeniowej...

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• Fatigue life tests of steel laser-welded sandwich structures

  Publikacja

  • D. Boroński
  • J. Szala

  - Polish Maritime Research - Rok 2006

  W publikacji zaprezentowano rezultaty systematycznych badań trwałości zmęczeniowej elementarnych połączeń wykonanych techniką spawania laserowego dla różnych wariantów geometrii złącz. Pokazano uzyskane wyniki i ich aproksymację, porównano uzyskane rezultaty dla różnych geometrii.

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• FEM strength analysis of sandwich panels for ship structure applications

  Publikacja

  • M. Augustyniak
  • G. Porembski

  - Polish Maritime Research - Rok 2006

  W publikacji zaprezentowano wyniki analizy numerycznej stalowego panelu sandwich obciążonego siłami ściskającymi wzdłuż laserowo spawanych usztywnień. Przedstawiono sposób modelowania, pokazano i przedyskutowano uzyskane rezultaty.

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• Geographic Information System (GIS) tools for aiding development of inland waterways fleet

  Publikacja

  • C. Żrodowski
  • A. Kniat
  • R. Pyszko

  - Polish Maritime Research - Rok 2006

  Informatyczne wspomaganie planowania i eksploatacji floty śródlądowej obejmuje szereg zagadnień, pośród których szczególnie istotne są problemy związane z analizą stanu istniejących dróg wodnych. Artykuł przedstawia koncepcję budowy modelu danych GIS dla potrzeb projektu INCOWATRANS z uwzględnieniem istniejących danych i ewentualnego wykorzystania ich przez administrację oraz innych użytkowników dróg wodnych.

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Rok 2023

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

  Publikacja

  • M. Drzewiecki
  • J. Guziński

  - Polish Maritime Research - Rok 2023

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

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

  Publikacja

  • P. Puzdrowska

  - Polish Maritime Research - Rok 2023

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

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• DYNAMIC POSITIONING CAPABILITY ASSESSMENT BASED ON OPTIMAL THRUST ALLOCATION

  Publikacja

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

  - Polish Maritime Research - Rok 2023

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

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

  Publikacja

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

  - Polish Maritime Research - Rok 2023

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

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

  Publikacja

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

  - Polish Maritime Research - Rok 2023

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

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

  Publikacja

  • Z. Korczewski

  - Polish Maritime Research - Rok 2023

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

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Rok 2019

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

  Publikacja

  • P. Dymarski

  - Polish Maritime Research - Rok 2019

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

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• Diagnostic Model of Crankshaft Seals

  Publikacja

  • P. Bzura

  - Polish Maritime Research - Rok 2019

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

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

  Publikacja

  • M. Kunicka
  • W. Litwin

  - Polish Maritime Research - Rok 2019

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

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

  Publikacja

  • A. Maczyszyn

  - Polish Maritime Research - Rok 2019

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

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

  Publikacja

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

  - Polish Maritime Research - Rok 2019

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

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• Generation and Propagation of Nonlinear Waves in a Towing Tank

  Publikacja

  • M. Drzewiecki
  • W. Sulisz

  - Polish Maritime Research - Rok 2019

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

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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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• Elastic protection coasting for ship tanks to increase environment protection level

  Publikacja

  • J. Kozak

  - Polish Maritime Research - Rok 2008

  W opracowaniu przedstawiono ideę nowego rozwiązania dla podniesienia bezpieczeństwa zbiorników paliwowych statków, polegającą na wprowadzeniu do zbiornika drugiej - elastycznej bariery ochronnej opartej na warstwie wypełniacza.

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• Elastic protection coating for ship fuel tanks, intended for the increasing of environment protection level

  Publikacja

  • J. Kozak

  - Polish Maritime Research - Rok 2008

  W opracowaniu przedstawiono problemy związane z wprowadzeniem nowego rozwiązania dla podniesienia bezpieczeństwa zbiorników paliwowych, poprzez zainstalowanie we wnętrzu zbiornika drugiej elastycznej bariery ochronnej opartej na warstwie wypełniacza. Przedstawiono wyniki prac związanych z doborem parametrów warstwy drugiej bariery jak również materiału wypełniacza.

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• Experimental investigations of the model tank of a liquid filled

  Publikacja

  • K. Trębacki

  - Polish Maritime Research - Rok 2008

  Praca dotyczy zagadnienia hydrosprężystości wewnętrznej i jest poświęcona badaniom eksperymentalnym drgań na modelu zbiornika wypełnionego cieczą. Badania dotyczą drgań giętnych w płaszczyźnie pionowej zbiornika odkształcalnego zawierającego ciecz. Otrzymano oscylogramy dla modelu suchego (brak cieczy) oraz dla modelu wypełnionego całkowicie cieczą. Następnie dokonano obróbki tych oscylogramów pod kątem badania drgań modelu w zakresie...

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• Fault detection in measuring systems of power plants

  Publikacja

  • J. Głuch

  - Polish Maritime Research - Rok 2008

  This paper describes possibility of forming diagnostic relations based on application of the artifical neural networks (ANNs), intended for the identifying of degradation of measuring instruments used in developed power systems. As an example a steam turbine high-power plant was used. And, simulative calculations were applied to forming diagnostic neural relations. Both degradation of the measuring instruments and simultaneously...

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• Graphical presentation of the power of energy losses and power developed in the elements hydrostatic drive and control system. Part II. Rotational hydraulic motor speed parallel throtling control and volumetric control systems

  Publikacja

  • Z. Paszota

  - Polish Maritime Research - Rok 2008

  Przedstawiono interpretację graficzną mocy strat energetycznych występujących w elementach układów napędu i sterowania hydrostatycznego, a także mocy rozwijanych przez te elementy. Dokonano analizy układu indywidualnego ze sterowaniem dławieniowym równoległym prędkości silnika hydraulicznego obrotowego, układu indywidualnego ze sterowaniem objętościowym, pompą o zmiennej wydajności, prędkości silnika hydrailicznego obrotowego,...

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• Graphical presentation of the power of energy losses and power developed in the elements of hydrostatic drive and control system. Part I. Rotational hydraulic motor speed series throttling control systems

  Publikacja

  • Z. Paszota

  - Polish Maritime Research - Rok 2008

  Zaproponowano i uzasadniono wykres przedstawiający kierunek wzrostu strumienia mocy narastającej od wału lub tłoczyska silnika hydraulicznego do wału pomopy, mocy narastającej w wyniku wymuszania przez moce strat energetycznych występujących w elementach układu i sterowania hydrostatycznego. Przedstawiono interpretację graficzną mocy strat energetycznych występujących w elementach układów, a także mocy rozwijanych przez te elementy....

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Rok 2021

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

  Publikacja

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

  - Polish Maritime Research - Rok 2021

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

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

  Publikacja

  • P. Puzdrowska

  - Polish Maritime Research - Rok 2021

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

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

  Publikacja

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

  - Polish Maritime Research - Rok 2021

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

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

  Publikacja

  • L. Rowiński

  - Polish Maritime Research - Rok 2021

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

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

  Publikacja

  • J. Kowalski

  - Polish Maritime Research - Rok 2021

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

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• HEAVE MOTION OF A VERTICAL CYLINDER WITH HEAVE PLATES

  Publikacja

  • E. Ciba

  - Polish Maritime Research - Rok 2021

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

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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 2022

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

  Publikacja

  • Z. Korczewski

  - Polish Maritime Research - Rok 2022

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

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Rok 2002

• Experimental measurements of the hydrodynamic characteristics of the pod propulsor models

  Publikacja

  • J. Szantyr

  - Polish Maritime Research - Rok 2002

  Praca przedstawia wyniki pomiarów charakterystyk hydrodymicznych trzech wariantów modelu pędnika azymutalnego. Charakterystyki obejmują napór pędnika, siłę boczną i moment względem osi pionowej w zależności od współczynnika posuwu i kąta dryfu.

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