Rok 2016

• STUDY OF SEASONAL ACOUSTIC PROPERTIES OF SEA WATER IN SELECTED WATERS OF THE SOUTHERN BALTIC

  Publikacja

  • G. Grelowska

  - Polish Maritime Research - Rok 2016

  Climate Research of the globe is a current task, in particular to confirm the general hypothesis of global warming associated with an increase in average temperature. The sea acoustic climate is derived from the concept of climate and refers to the conditions of propagation of acoustic waves in a particular basin. In this paper, the results of systematic measurements of temperature, salinity and velocity distributions of sound...

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• THE APPLICATION OF KALMAN FILTERING TO PREDICT VERTICAL RAIL AXIS DISPLACEMENTS OF THE OVERHEAD CRANE BEING A COMPONENT OF SEAPORT TRANSPORT STRUCTURE

  Publikacja

  • D. Filipiak-Kowszyk
  • W. Kamiński

  - Polish Maritime Research - Rok 2016

  As the devices designed to transport materials, the overhead cranes should meet certain geometric requirements for their operation to be safe. The presently available geodetic equipment, in particular total stations, provides opportunities for precise 3D measurements of coordinates of the controlled points. These coordinates make a basis for correcting the height of crane runway axes. The paper presents a method to calculate position...

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Rok 2015

• A Model of Thermal Energy Storage According to the Convention of Bond Graphs (BG) and State Equations (SE)

  Publikacja

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

  - Polish Maritime Research - Rok 2015

  The main advantage of the use of the Bond Graphs method and State Equations for modeling energy systems with a complex structure (marine power plants, hybrid vehicles, etc.) is the ability to model the system components of different physical nature using identical theoretical basis. The paper presents a method of modeling thermal energy storage, which is in line with basic BG theory. Critical comments have been put forward concerning...

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• An Experimental Study of Emission and Combustion Characteristics of Marine Diesel Engine in Case of Cylinder Valves Leakage

  Publikacja

  • J. Kowalski

  - Polish Maritime Research - Rok 2015

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• Application Isssues of the Semi-Markov Reliability Model

  Publikacja

  • J. Rudnicki

  - Polish Maritime Research - Rok 2015

  Predicting the reliability of marine internal combustion engines, for instance, is of particular importance, as it makes it possible to predict their future reliability states based on the information on the past states. Correct reliability prediction is a complex process which consists in processing empirical results obtained from operating practice, complemented by analytical considerations. The process of technical state changes...

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

  Publikacja

  • J. Girtler

  - Polish Maritime Research - Rok 2015

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

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

  Publikacja

  • M. Jakubowski

  - Polish Maritime Research - Rok 2015

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

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

  Publikacja

  • Z. Domachowski
  • M. Dzida

  - Polish Maritime Research - Rok 2015

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

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• MARITIME LASER SCANNING AS THE SOURCE FOR SPATIAL DATA

  Publikacja

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

  - Polish Maritime Research - Rok 2015

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

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

  Publikacja

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

  - Polish Maritime Research - Rok 2015

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

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• Problems of Determination of Welding Angular Distortions of T-fillet Joints in Ship Hull Structures

  Publikacja

  • J. Kozak
  • J. Kowalski

  - Polish Maritime Research - Rok 2015

  Ship hull structure elements are in majority joined by welding. Welding distortions can cause a lot of problems during the manufacturing process. In the literature it is proposed wide spectrum of suggestions for a correct estimation of welding deformation in particular angular deformation in the fillet welded T joint. In the work verification of selected methods is proposed basing upon of the results of the laboratory measurements....

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• THE INFLUENCE OF MANUFACTURING OVERSIZING ON POSTWELDING DISTORTIONS OF THE FILLET WELDED JOINT

  Publikacja

  • J. Kozak
  • J. Kowalski

  - Polish Maritime Research - Rok 2015

  Welding proces is basic joining technique in shipbuilding. Such method generated welding distortions which cause a lot of problems during the manufacturing process. In the literature it is proposed wide spectrum of suggestions for a correct estimation of welding deformation in particular angular deformation in the fillet welded T joint. In the work influence of oversizing of weld on angular distortions of joint is presented basing...

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• The Proposal to “Snapshot” Raim Method for Gnss Vessel Receivers Working in Poor Space Segment Geometry

  Publikacja

  • A. Nowak

  - Polish Maritime Research - Rok 2015

  Nowadays, we can observe an increase in research on the use of small unmanned autonomous vessel (SUAV) to patrol and guiding critical areas including harbours. The proposal to “snapshot” RAIM (Receiver Autonomous Integrity Monitoring) method for GNSS receivers mounted on SUAV operating in poor space segment geometry is presented in the paper. Existing “snapshot” RAIM methods and algorithms which are used in practical applications...

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• Tryton Supercomputer Capabilities for Analysis of Massive Data Streams

  Publikacja

  • H. Krawczyk
  • M. Nykiel
  • J. Proficz

  - Polish Maritime Research - Rok 2015

  The recently deployed supercomputer Tryton, located in the Academic Computer Center of Gdansk University of Technology, provides great means for massive parallel processing. Moreover, the status of the Center as one of the main network nodes in the PIONIER network enables the fast and reliable transfer of data produced by miscellaneous devices scattered in the area of the whole country. The typical examples of such data are streams...

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Rok 2014

• A numerical model to simulate the motion of a lifesaving module during its launching from the ship’s stern ramp

  Publikacja

  • P. Dymarski
  • C. Dymarski

  - Polish Maritime Research - Rok 2014

  The article presents a numerical model of object motion in six degrees of freedom (DoF) which is intended to be used to simulate 3D motion of a lifesaving module during its launching from a ship using a stern ramp in rough sea. The model, of relatively high complexity, takes into account both the motion of the ship on water in changing sea conditions, and the relative motion of the ramp with respect to the ship. The motion of the...

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• Application of theory of semi-Markov processes to determining distribution of probabilistic process of marine accidents resulting from colission of ships

  Publikacja

  • J. Girtler

  - Polish Maritime Research - Rok 2014

  In this paper is presented possible application of the theory of semi-Markov processes to elaborating an eight-state model of the process of occurrence of serviceability state and unserviceability states of sea-going ships making critical manoeuvres during their entering and leaving the ports. In the analysis it was taken into account that sea-going ships are in service for a very long time t (t → ∞). The model was elaborated to...

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• Balancing energy processes in turbine engines

  Publikacja

  • W. Balicki
  • P. Głowacki
  • S. Szczeciński
  • Z. Korczewski
  • A. Kozakiewicz
  • J. Szczeciński

  - Polish Maritime Research - Rok 2014

  The article discusses the issue of balancing energy processes in turbine engines in operation in aeronautic and PDULQHSURSXOVLRQV\VWHPVZLWKWKHDLPWRDQDO\VHDQGHYDOXDWH EDVLFRSHUDWLQJSDUDPHWHUV7KH¿UVWSDUWSUHVHQWV the problem of enormous amounts of energy needed for driving fans and compressors of the largest contemporary turbofan engines commonly used in long-distance aviation. The amounts of the transmitted power and the effect RIÀRZSDUDPHWHUVDQGFRQVWUXFWLRQDOSURSHUWLHVRIWKHHQJLQHV RQWKHLUSHUIRUPDQFHDQGUHDOHI¿FLHQF\DUH evaluated....

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• Bead-on-plate welding on S235JR steel by underwater local dry chamber process

  Publikacja

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

  - Polish Maritime Research - Rok 2014

  The article presents the results of the effect of parameters of underwater local dry chamber welding on the properties of padding welds. The effect of heat input and the type of shielding gas on the structure and hardness of welds was established. the functions for estimating the maximum hardness of the heat affected zone have been also elaborated.

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

  Publikacja

  • M. Jakubowski

  - Polish Maritime Research - Rok 2014

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

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

  Publikacja

  • Z. Paszota

  - Polish Maritime Research - Rok 2014

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

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• Monitoring of underdeck corrosion by using acoustic emission method

  Publikacja

  • K. Emilianowicz

  - Polish Maritime Research - Rok 2014

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

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

  Publikacja

  • J. Szantyr
  • T. Bugalski

  - Polish Maritime Research - Rok 2014

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

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• Parametric method for evaluating optimal ship deadweight

  Publikacja

  • J. Michalski

  - Polish Maritime Research - Rok 2014

  The paper presents a method of choosing the optimal value of the cargo ships deadweight. The method may be useful at the stage of establishing the main owners requirements concerning the ship design parameters as well as for choosing a proper ship for a given transportation task. The deadweight is determined on the basis of a selected economic measure of the transport effectiveness of ship – the Required Freight Rate (RFR). The...

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• Problems of modelling toxic compounds emitted by a marine internal combustion engine in unsteady states

  Publikacja

  • J. Rudnicki
  • R. Zadrąg

  - Polish Maritime Research - Rok 2014

  Contemporary engine tests are performed based on the theory of experiment. The available versions of programmes used for analysing experimental data make frequent use of the multiple regression model, which enables examining effects and interactions between input model parameters and a single output variable. The use of multi-equation models provides more freedom in analysing the measured results, as those models enable simultaneous...

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• The Quick Measure of a Nurbs Surface Curvature for Accurate Triangular Meshing

  Publikacja

  • A. Kniat

  - Polish Maritime Research - Rok 2014

  NURBS surfaces are the most widely used surfaces for three-dimensional models in CAD/CAE programs. As a model for FEM calculation is prepared with a CAD program it is inevitable to mesh it finally. There are many algorithms for meshing planar regions. Some of them may be used for meshing surfaces but it is necessary to take the curvature of the surface under consideration to avoid poor quality mesh. The mesh must be denser in the...

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Rok 2013

• A novel method for archiving multibeam sonar data with emphasis on efficient record size reduction and storage

  Publikacja

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

  - Polish Maritime Research - Rok 2013

  Over the past few years considerable advances in sonar technology, spatial positioning capabilities and computer processing power have lead to significant improvements in mapping, imaging and technologies of seafloor exploration. Recently, modern multibeam echosounder systems (MBES) capable of recording backscatter data for the whole water column, not just for the seabed, have become available thus providing data allowing for...

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• Analysing the potential for application of the phase shift method in endoscopic examination of marine engines

  Publikacja

  • Z. Korczewski

  - Polish Maritime Research - Rok 2013

  The article presents theoretical principles of image processing in digital endoscopy which makes use of a miniaturised spectral scanner “PhaseProbe” designed by General Inspection Technologies LP, the producer of the measuring videoendoscope Everest XLG3. The technology of optoelectronic 3D mapping of the examined surface, which consists in measuring the phase shift between the emitted and reflected light waves, is briefly described....

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• Application of Shape From Shading Technique for Side Scan Sonar Images

  Publikacja

  • K. Bikonis
  • M. Moszyński
  • Z. Łubniewski

  - Polish Maritime Research - Rok 2013

  Side scan sonar (SSS) is one of the most widely used imaging systems in the underwater environment. It is relatively cheap and easy to deploy in comparison with more powerful sensors like multibeam echosounder or synthetic aperture sonar. Although, the SSS does not provide directly the seafloor bathymetry measurements. Its outputs are usually in a form of grey level acoustic images of seafloor. However, the analysis of such images...

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• Calculations of labyrinth seals with and without diagnostic extraction in fluid-flow machines

  Publikacja

  • P. B. Kaszowski
  • M. Dzida
  • P. Krzyślak

  - Polish Maritime Research - Rok 2013

  Labyrinth seals are essential components of steam turbine unit constructions. Two types of labyrinth seals can be named, the first of which is the seal without diagnostic steam extraction, and the second – with extraction. The distribution of flow parameters along the packing is affected remarkably by the average seal clearance. The presence of diagnostic extraction leads to the equation system which is determinable and can be...

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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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• 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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• Losses and energy efficiency of drive motors and systems

  Publikacja

  • Z. Paszota

  - Polish Maritime Research - Rok 2013

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

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

  Publikacja

  • Z. Paszota

  - Polish Maritime Research - Rok 2013

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

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

  Publikacja

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

  - Polish Maritime Research - Rok 2013

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

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

  Publikacja

  • L. Matuszewski

  - Polish Maritime Research - Rok 2013

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

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• The semi-Markov model of the process of appearance of sea-going ship propupsion system ability and inability states in application to determining the reliablity of these systems

  Publikacja

  • J. Girtler

  - Polish Maritime Research - Rok 2013

  The article presents possible application of the theory of semi-Markov processes in creating the eight-state model of the process of appearance of the propulsion systems ability and inability states on sea-going vessels performing transportation tasks in a relatively long operating time t (t → ∞). The model has been proved to be able to be successfully used for determining the reliability of the abovementioned systems. The probability...

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• Weldability of high strength steels in wet welding conditions

  Publikacja

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

  - Polish Maritime Research - Rok 2013

  In this paper are characterized problems of high strength steel weldability in underwater wet welding conditions. Water as a welding environment intensifies action of unfavourable factors which influence susceptibility to cold cracking of welded steel joints. The susceptibility to cold cracking of S355J2G3 steel and S500M steel in wet conditions was experimentally estimated (by using Tekken test). It was concluded that the steels...

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