Rok 2017

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

  Publikacja

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

  - Polish Maritime Research - Rok 2017

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

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

  Publikacja

  • P. Śliwiński

  - Polish Maritime Research - Rok 2017

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

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• Internet photogrammetry for inspection of seaports

  Publikacja

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

  - Polish Maritime Research - Rok 2017

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

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

  Publikacja

  • P. Zima

  - Polish Maritime Research - Rok 2017

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

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• Living and working beneath the sea – next approach

  Publikacja

  • L. Rowiński

  - Polish Maritime Research - Rok 2017

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

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

  Publikacja

  • A. Chybicki

  - Polish Maritime Research - Rok 2017

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

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

  Publikacja

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

  - Polish Maritime Research - Rok 2017

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

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• Multi-objective weather routing of sailing vessels

  Publikacja

  • M. Życzkowski
  • R. Szłapczyński

  - Polish Maritime Research - Rok 2017

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

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• Numerical Modelling of Structures with Uncertainties

  Publikacja

  • M. Kahsin

  - Polish Maritime Research - Rok 2017

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

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• OPERATION OF TWO-SHAFT GAS TURBINE IN THE RANGE OF OPEN ANTI-SURGE VALVE

  Publikacja

  • M. Dzida
  • J. Frost

  - Polish Maritime Research - Rok 2017

  This paper presents experimental tests of full-scale two-shaft gas turbine in the range of open anti-surge valve (ASV). The tests were carried out in a laboratory gas- turbine test stand belonging to Department of Automation and Power Engineering , Faculty of Ocean Engineering and Ship Technology , Gdańsk University of Technology. The tests covered the start-up and low load operation of the turbine set in the range of open...

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• PHYSICAL MODELLING OF GEOTECHNICAL STRUCTURES IN PORTS AND OFFSHORE

  Publikacja

  • L. Bałachowski

  - Polish Maritime Research - Rok 2017

  The physical modelling of subsoil behaviour and soil-structure interaction is essential for the proper design of offshore structures and port infrastructure. A brief introduction to such modelling of geoengineering problems is presented and some methods and experimental devices are described. The relationships between modelling scales are given. Some examples of penetration testing results in centrifuge and calibration chamber...

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• Possibilities of heat transfer augmentation in heat exchangers with minichannels for marine applications

  Publikacja

  • D. Mikielewicz
  • J. Wajs

  - Polish Maritime Research - Rok 2017

  In the paper, new trends in development of microchannel heat exchangers are presented. The exchangers developed in this way can be applied in marine applications. Main attention was focused on heat exchangers design with reduced size of passages namely based on microchannels. In our opinion future development of high power heat exchangers will be based on networks micro heat exchangers.

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• PRELIMINARY FIELD TESTS AND LONG-TERM MONITORING AS A METHOD OF DESIGN RISK MITIGATION: A CASE STUDY OF GDAŃSK DEEPWATER CONTAINER TERMINAL

  Publikacja

  • M. Miśkiewicz
  • O. Mitrosz
  • T. Brzozowski

  - Polish Maritime Research - Rok 2017

  Appropriate risk assessment plays a fundamental role in the design. . The authors propose a possible method of design risk mitigation, which follows recommendations included in Eurocode 7. The so-called “Observational Method” (OM) can produce savings in costs and programmes on engineering projects without compromising safety. The case study presented is a complex design solution that deals with the heavy foundations of a gantry...

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• PROBLEMS OF THE STARTING AND OPERATING OF HYDRAULIC COMPONENTS AND SYSTEMS IN LOW AMBIENT TEMPERATURE (PART IV) MODELLING THE HEATING PROCESS AND DETERMINING THE SERVICEABILITY OF HYDRAULIC COMPONENTS DURING THE STARTING-UP IN LOW AMBIENT TEMPERATURE

  Publikacja

  • R. Jasiński

  - Polish Maritime Research - Rok 2017

  Designers of hydraulically driven machines and devices are obliged to ensure during design process their high service life with taking into account their operational conditions. Some of the machines may be started in low ambient temperature and even in thermal shock conditions (due to delivering hot working medium to cold components). In order to put such devices into operation appropriate investigations, including experimental...

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• PROBLEMS OF THE STARTING AND OPERATING OF HYDRAULIC COMPONENTS AND SYSTEMS IN LOW AMBIENT TEMPERATURE (PART V) METHODS ENSURING CORRECT START-UP OF HYDRAULIC COMPONENTS OF SHIP’S ONBOARD DEVICES IN LOW AMBIENT TEMPERATURES

  Publikacja

  • R. Jasiński

  - Polish Maritime Research - Rok 2017

  A large number of hydraulic devices and systems are started in low ambient temperatures. A good example of such a device is the hoisting winch on the ship. Starting hydraulic drive units in thermal shock conditions (rapid supply of hot oil to the cold unit) may lead to incorrect operation of the actuating system, for instance, due to the loss of clearance between cooperating elements. The article presents methods to prevent the...

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• Searching for Critical Conditions During Lifeboat Launching – Simulations

  Publikacja

  • C. Dymarski
  • P. Dymarski
  • A. Kniat

  - Polish Maritime Research - Rok 2017

  The article describes numerical simulations of the process of lifeboat launching at the ship’s side. The research is aimed at finding the values of ship motion parameters which appear to be most dangerous for people in the lowered lifeboat due to the generated accelerations. The simplified model of ship hull motion adopted at this research stage bases on a superposition of harmonic motions with given amplitudes and periods in six...

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• Selected Problems of Transport in Port Towns – Tri-City as an Example

  Publikacja

  • M. Budzyński
  • D. Ryś
  • W. Kustra

  - Polish Maritime Research - Rok 2017

  Port towns are strategic places from the point of view of transport systems. They form integration junctions for various transport branches , apart from the traditional - road and railway ones , also for water( sea) transport which is active there. Moreover, air transport comes also into consideration , whose efficient functioning must be connected with good accessibility, that concerns sea transport as well. Efficient and...

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• Simulation studies into quayside transport and storage yard operations in container terminals

  Publikacja

  • M. Deja
  • M. Dobrzyński
  • M. Siemiątkowski
  • A. T. Wiśniewska

  - Polish Maritime Research - Rok 2017

  The focus of the paper is on quayside transport and storage yard operations in the sea container terminals. Developed algorithms for solving the issues of load handling and storage space allocation have been applied in the frame of adopted simulation model. The criteria chosen for decision making involved the total makespan of vessel unloading and the utilisation levels of the transportation trucks. Recommendations for unloading...

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• Strength analysis of a large-size supporting structure for an offshore wind turbine

  Publikacja

  • K. Niklas

  - Polish Maritime Research - Rok 2017

  The offshore wind power industry is the branch of electric energy production from renewable sources which is most intensively developed in EU countries. At present, there is a tendency to install larger-power wind turbines at larger distances from the seashore, on relatively deep waters. Consequently, technological solutions for new supporting structures intended for deeper water regions are undergoing rapid development now. Various...

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• Technical monitoring system for a new part of Gdańsk Deepwater Container Terminal

  Publikacja

  • M. Miśkiewicz
  • Ł. Pyrzowski
  • K. Wilde
  • O. Mitrosz

  - Polish Maritime Research - Rok 2017

  Development strategy for the port of Gdańsk assumes that , up to 2027, it will become the main transport centre in the Baltic Sea region. To this end , for many years work has been carried out to facilitate access to the port both by sea and land. One of the elements of extension of the port is the building of another terminal of Deepwater Container Terminal , Gdańsk. In this task, geotechnical operations aimed at appropriate...

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• Technical State Assessment of Charge Exchange System of Self-Ignition Engine, Based On the Exhaust Gas Composition Testing

  Publikacja

  • J. Rudnicki
  • R. Zadrąg

  - Polish Maritime Research - Rok 2017

  This paper presents possible use of results of exhaust gas composition testing of self - ignition engine for technical state assessment of its charge exchange system under assumption that there is strong correlation between considered structure parameters and output signals in the form of concentration of toxic compounds (ZT) as well as unambiguous character of their changes. Concentration of the analyzed ZT may be hence considered...

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• Technology Concept of TLP Platform Towing and Installation in Waters with Depth of 60 m

  Publikacja

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

  - Polish Maritime Research - Rok 2017

  The article is part of the design and research work conducted at the Gdansk University of Technology, Faculty of Ocean Engineering and Ship Technology, in cooperation with a number of other research centres, which concerns offshore wind farms planned to be built in the Polish zone of the Baltic sea in the next years. One of most difficult tasks in this project is building suitable foundations for each power unit consisting of a...

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• The effect of fishing basin construction on the behaviour of a footbrdge over the port channel

  Publikacja

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

  - Polish Maritime Research - Rok 2017

  The paper analyses possible causes of failure of the rotating footbridge over the Ustka port channel. In July, 2015, strange behaviour of this object was observed in the form of excessive vibrations of bridge platform suspension rods, with the accompanying acoustic effects. A preliminary geotechnical analysis has revealed that this destructive effect was caused by the nearby construction works, namely construction of a fishing...

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• The experimental identification of the dynamic coefficients of two hydrodynamic journal bearings operating at constant rotational speed and under nonlinear conditions.

  Publikacja

  • Ł. Breńkacz
  • G. Żywica
  • M. Drosińska-Komor

  - Polish Maritime Research - Rok 2017

  Hydrodynamic bearings are commonly used in ship propulsion systems. Typically, they are calculated using numerical or experimental methods. This paper presents an experimental study through which it has been possible to estimate 24 dynamic coefficients of two hydrodynamic slide bearings operating under nonlinear conditions. During the investigation, bearing mass coefficients are identified by means of a newly developed algorithm....

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• The influence of water and mineral oil on volumetric losses in a hydraulic motor

  Publikacja

  • P. Śliwiński

  - Polish Maritime Research - Rok 2017

  In this paper volumetric losses in hydraulic motor supplied with water and mineral oil (two liquids having significantly different viscosity and lubricating properties) are described and comparison. The experimental tests were conducted using an innovative hydraulic satellite motor, that is dedicated to work with different liquid, including water. The sources of leaks in this motor are characterized and described also. On this...

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• Theoretical Model of Acoustic Wave Propagation in Shallow Water

  Publikacja

  • E. Kozaczka
  • G. Grelowska

  - Polish Maritime Research - Rok 2017

  The work is devoted to the propagation of low frequency waves in a shallow sea. As a source of acoustic waves, underwater disturbances generated by ships were adopted. A specific feature of the propagation of acoustic waves in shallow water is the proximity of boundaries of the limiting media characterised by different impedance properties, which affects the acoustic field coming from a source situated in the water layer “ deformed”...

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• TOTAL SHIP OPERABILITY – REVIEW, CONCEPT AND CRITERIA

  Publikacja

  • M. H. Ghaemi
  • H. Olszewski

  - Polish Maritime Research - Rok 2017

  The ship operability can be understood and analysed in different manners, and its quality is described using different indexes by different authors. Practically, there is no general and widely accepted description of total ship operability in the literature, nor in the rules of classification societies, which would include both seakeeping and manoeuvrability characteristics of a ship, and simultaneously take into account all ship...

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• Underwater Wet Repair Welding of API 5L X65M Pipeline Steel

  Publikacja

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

  - Polish Maritime Research - Rok 2017

  This paper presents results of the research of effect of polymer insulation of pipeline made of API 5L X65M steel as well as underwater wet welding parameters on properties of joints made by covered electrodes. Effect of heat input on structure and hardness of joints during repair of underwater pipeline was analyzed. Welding defects like microcracks, micro-lacks of fusion, slag inclusions, as well as HAZ hardness increase over...

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• VARIANT DESIGNING IN the PRELIMINARY SMALL SHIP DESIGN PROCESS

  Publikacja

  • A. Karczewski
  • J. Kozak

  - Polish Maritime Research - Rok 2017

  Ship designing is a complex process, as the ship itself is a complex, technical multi-level object which operates in the air/water boundary environment and is exposed to the action of many different external and internal factors resulting from the adopted technical solutions, type of operation, and environmental conditions. A traditional ship design process consists of a series of subsequent multistage iterations, which gradually...

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• Visualization of a lifeboat motion during lowering along ship’s side

  Publikacja

  • A. Kniat

  - Polish Maritime Research - Rok 2017

  This paper presents description of a computer program for motion visualization of a lifeboat lowered along ship’s side. The program is a post-processor which reads results of numerical calculations of simulated objects’ motions. The data is used to create scene composed of 3D surfaces to visualize mutual spatial positions of a lifeboat, ship’s side and water waving surface. Since the numerical data contain description of a simulation...

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Rok 2016

• A Method for The Assessing of Reliability Characteristics Relevant to an Assumed Position-Fixing Accuracy in Navigational Positioning Systems

  Publikacja

  • C. Specht
  • J. Rudnicki

  - Polish Maritime Research - Rok 2016

  This paper presents a method which makes it possible to determine reliability characteristics of navigational positioning systems, relevant to an assumed value of permissible error in position fixing. The method allows to calculate: availability , reliability as well as operation continuity of position fixing system for an assumed, determined on the basis of formal requirements - both worldwide and national, position-fixing accuracy....

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• A model of fuel combustion process in the marine reciprocating engine work space taking into account load and wear of crankshaft-piston assembly and the theory of semi-Markov processes

  Publikacja

  • J. Girtler

  - Polish Maritime Research - Rok 2016

  The ar ticle analyses the operation of reciprocal internal combu stion engines, with mar ine engines u sed a s an example. The analysis takes into account types of energy conversion in the work spaces (cylinders) of these engines, loads of their crankshaft-piston assemblies, and types of fuel combustion which can take place in these spaces during engine operation. It is highlighted that the analysed time-dependent loads of marine...

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• An Experimental Study of Emission and Combustion Characteristics of Marine Diesel Engine with Fuel Injector Malfunctions

  Publikacja

  • J. Kowalski

  - Polish Maritime Research - Rok 2016

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• Analysis of possible application of high-temperature nuclear reactors to contemporary large-output steam power plants on ships

  Publikacja

  • T. Kowalczyk
  • J. Głuch
  • P. Ziółkowski

  - Polish Maritime Research - Rok 2016

  This paper is aimed at analysis of possible application of helium to cooling high-temperature nuclear reactor to be used for generating steam in contemporary ship steam-turbine power plants of a large output with taking into account in particular variable operational parameters. In the first part of the paper types of contemporary ship power plants are presented. Features of today applied PWR reactors and proposed HTR reactors...

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

  Publikacja

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

  - Polish Maritime Research - Rok 2016

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

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

  Publikacja

  • M. Przyborski

  - Polish Maritime Research - Rok 2016

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

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

  Publikacja

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

  - Polish Maritime Research - Rok 2016

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

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

  Publikacja

  • A. Maczyszyn

  - Polish Maritime Research - Rok 2016

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

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

  Publikacja

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

  - Polish Maritime Research - Rok 2016

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

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• On power stream in motor or drive system

  Publikacja

  • Z. Paszota

  - Polish Maritime Research - Rok 2016

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

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• Operation evaluation method for marine turbine combustion engines in terms of energetics

  Publikacja

  • J. Girtler
  • M. Dzida

  - Polish Maritime Research - Rok 2016

  An evaluation proposal (quantitative determination) of an y combustion turbine engine operation has been presented , wherein the impact energy occurs at a given time due to Energy conversion. The fact has been taken into account that in this type of internal combustion engines the energy conversion occurs first in the combustion chambers and in the spaces between the blade of the turbine engine. It was assumed that in the combustion...

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• Parametrical Method for Determining Optimal Ship Carrying Capacity and Performance of Handling Equipment

  Publikacja

  • J. Michalski

  - Polish Maritime Research - Rok 2016

  The paper presents a method of evaluating the optimal value of the cargo ships deadweight and the coupled optimal value of cargo handling capacity. 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 second hand ship for a given transportation task. The deadweight and the capacity are determined on the basis of a selected economic...

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