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Tytuł:
A comparative components importance analysis of a complex technical system with the use of different importance measures
Analiza porównawcza ważności elementów systemu technicznego z jednoczesnym wykorzystaniem różnych miar ważności
Autorzy:
Chybowski, L.
Idziaszczyk, D.
Wiśnicki, B.
Powiązania:
https://bibliotekanauki.pl/articles/112937.pdf
Data publikacji:
2014
Wydawca:
STE GROUP
Tematy:
importance measures
comparative analysis
ship propulsion system
miara ważności
analiza porównawcza
okrętowy układ napędowy
Opis:
This paper presents a components importance analysis of a complex technical system with the use of selected reliability components importance measures. The analysis was carried out on a propeller shaft stern tube seal of a ship propulsion system. The reliability structure of the analyzed system was modeled by means of the fault tree. For given system components the following were determined: the Birnbaum’s reliability and structural importance measure, reliability improvement potential, criticality measure and Vesely-Fussell’s measure. A transformation of measures based on rescaling their values has been proposed to simplify the comparative analysis using different measures with reference to the same system components. A transformation process for the analyzed system has been presented together with a results visualization of comparative components importance analysis by means of 3D bar charts and radar charts for a data series determined as system components and importance measures. Comments on the proposed methodology have been presented and other ways of its application have been indicated.
W artykule przedstawiono analizę ważności elementów złożonego systemu technicznego z wykorzystaniem wybranych niezawodnościowych miar ważności elementów. Analizę przeprowadzono na przykładzie systemu smarowania i uszczelnienia pochwy wału śrubowego układu napędowego statku. Strukturę niezawodnościową analizowanego systemu zamodelowano z wykorzystaniem drzewa niezdatności. Dla poszczególnych elementów systemu wyznaczono niezawodnościową miarę ważności Birnbauma, miarę strukturalną Birnbauma, Potencjał przyrostu niezawodności, miarę krytyczności oraz miarę Veseley-Fussell’a, Zaproponowano transformację miar polegająca na przeskalowaniu ich wartości w celu ułatwienia analizy porównawczej wykorzystującej różne miary w odniesieniu do tych samych elementów systemu. Przedstawiono dla analizowanego systemu proces transformacji oraz zaprezentowano wizualizację wyników analizy porównawczej ważności elementów z wykorzystaniem wykresów słupkowych 3D oraz wykresów radarowych dla serii danych ustalonych jako elementy systemu oraz jako miary ważności. Przedstawiono uwagi dotyczące zaproponowanej metodyki i wskazano inne możliwe jej zastosowania.
Źródło:
Systemy Wspomagania w Inżynierii Produkcji; 2014, 1 (7); 23-33
2391-9361
Pojawia się w:
Systemy Wspomagania w Inżynierii Produkcji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A concept design of diesel – hydraulic propulsion system for passenger ship intended for inland shallow water navigation
Autorzy:
Dymarski, Czesław
Powiązania:
https://bibliotekanauki.pl/articles/259998.pdf
Data publikacji:
2019
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ship propulsion systems
hydraulic drive and control
azimuthal propulsion systems
Opis:
This paper presents an analysis of environmental and technical conditions necessary for working out a possibly most favourable propulsion system for a two – segment passenger ship intended for navigation between Berlin and Kaliningrad. There are presented various types of propulsion systems for small ships as well as analyzed their possible applications and consequences. In this work there were taken into account system’s reliability, efficiency, dimensions, mass and costs of manufacturing, assembling and possible replacing the system components as well as an impact on maneuverability and natural environment. With taking into account the above mentioned criteria it was finally found that the diesel-hydraulic system fitted with two azimuthal ducted solid propellers is the most favourable. There are also presented a schematic propulsion and control diagram, three-dimensional arrangement drawing of system components as well as assembly drawing of the designed azimuthal propulsion system.
Źródło:
Polish Maritime Research; 2019, 3; 30-38
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A method for estimating propulsion risk of the ship casualty
Autorzy:
Nguyen, N.
Powiązania:
https://bibliotekanauki.pl/articles/242339.pdf
Data publikacji:
2013
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
estimation
expert judgment
risk
ship propulsion system
analytic hierarchy process (AHP)
sea transport
Opis:
Loss of the propulsion function by a ship is one of the most serious categories of hazardous events in sea transport. In specific external conditions it may lead to a loss of ship and environmental pollution. The consequences of propulsion loss by a ship are events classified by the International Maritime Organization as casualties or incidents. The probabilities of occurrence of the former events in a specific time unit constitute the propulsion risk of a ship. Determination of these probabilities is in practice confronted with difficulties connected with shortage of data. A method for estimating the risk caused by loss of a seagoing ship propulsion function is proposed. The estimation is fully based on the expert judgments. Expert is assumed to be well acquainted with the subject he is expected to formulate his judgment on. Expert should also be capable of formulating his judgment. This is connected with level of his education and the language used in the elicitation process, particularly as regards the parameters the expert is expected to estimate. This may be the language of numerical or linguistic values. Numerical values are better but are more difficult to articulate - also errors in judgments are more likely. To overcome this problem and to obtain a more accurate estimation, this study suggests using an analytic hierarchy process (AHP), which quantifies the subjective judgments and confirms the consistency of collected data. An example of the propulsion risk estimation of container carriers operating on the North Atlantic line allows to assess effectiveness of the method.
Źródło:
Journal of KONES; 2013, 20, 2; 315-321
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A method for selection of parameters of ship propulsion system fitted with compromise screw propeller
Autorzy:
Michalski, J. P.
Powiązania:
https://bibliotekanauki.pl/articles/260378.pdf
Data publikacji:
2007
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
design of inland waterways ships
ship propellers
ship propulsion
Opis:
This paper concerns an algorithmic method for preliminary selection of parameters of ship propulsion system fitted with fixed screw propeller in the case when the ship’s operation is associated with significant changes of waterway depth and width, hull resistance of the ship and its service speed. Mathematical model arguments of the considered design problem are main ship design parameters identified in the preliminary design stage. Structure of the formulated model complies with formal requirements for continuous- discrete mathematical optimization problems. The presented examples of application of the method concern an inland waterways ship fitted with compromise screw propeller optimized in the sense of minimization of fuel consumption for passing a given route distance within a given time. The elaborated method may be especially useful in designing such ships as : coasters, inland waterways ships, tugs, pushers, trawlers, mine sweepers, icebreakers etc.
Źródło:
Polish Maritime Research; 2007, 4; 3-9
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Model of Ship Propulsion Systems Operating Process
Model procesu eksploatacji układu napędowego statku
Autorzy:
Girtler, J.
Powiązania:
https://bibliotekanauki.pl/articles/360243.pdf
Data publikacji:
2004
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
proces eksploatacji
proces semimarkowski
układ napędowy statku
EXPLO-SHIP 2004
operation process
semi-Markov process
ship propulsion system
Opis:
The paper contains a formal description of ship propulsion systems operation process. The model of the process is presented in the form of two-dimensional stochastic process of which coordinates are semi-Markov processes of the final states set. The former process describes the process of changes in technical states of ship propulsion systems, the latter - the process of changes in their operating states. A monovariate model of ship propulsion systems operation process has also been proposed.
Podano opis formalny procesu eksploatacji układów napędowych statków. Model tego procesu przedstawiono w formie dwuwymiarowego procesu, którego współrzędnymi są procesy semi-Markowa o skończonych zbiorach stanów. Jeden z tych procesów jest procesem zmian stanów technicznych układów napędowych a drugi - procesem zmian ich stanów eksploatacyjnych. Zaproponowano także jednowymiarowy model procesu eksploatacji układów napędowych statków.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2004, 1 (73); 211-220
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A proposal of ship gas-turbine driven waterjet propulsion - preliminary considerations
Autorzy:
Próchnicki, W.
Powiązania:
https://bibliotekanauki.pl/articles/962800.pdf
Data publikacji:
2004
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ship propulsion
hydromechanics
waterjet
Opis:
In the paper are presented preliminary considerations concerning the efficiency of waterjet ship propulsion system, as well as the calculation of main dimensions of waterjet channel. The friction and momentum losses of the flow channel have been roughly estimated by using Fliegner s equations. An important conclusion is confirmed that the summary losses are inversely proportional to square of ship velocity (~1/u2). On the other hand the ship propulsion power is directly proportional to third power of ship velocity (~u3). Therefore to minimize ship s hull resistance, hulls of water jet-driven ships ought to be of a great slenderness - e.g. L/B = 15, stabilized by sponsons, or of semi-swath hydrofoil-supported construction.
Źródło:
Polish Maritime Research; 2004, S 1; 79-82
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Step by Step Approach for Evaluating the Reliability of the Main Engine Lube Oil System for a Ships Propulsion System
Autorzy:
Anantharaman, M.
Khan, F.
Garaniya, V.
Lewarn, B.
Powiązania:
https://bibliotekanauki.pl/articles/116248.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
Ship Propulsion
Main Engine
Main Propulsion
Lubricating Oil System
Markov Analysis
reliability
Propulsion System
Engine Lube Oil System
Opis:
Effective and efficient maintenance is essential to ensure reliability of a ship's main propulsion system, which in turn is interdependent on the reliability of a number of associated sub- systems. A primary step in evaluating the reliability of the ship's propulsion system will be to evaluate the reliability of each of the sub- system. This paper discusses the methodology adopted to quantify reliability of one of the vital sub-system viz. the lubricating oil system, and development of a model, based on Markov analysis thereof. Having developed the model, means to improve reliability of the system should be considered. The cost of the incremental reliability should be measured to evaluate cost benefits. A maintenance plan can then be devised to achieve the higher level of reliability. Similar approach could be considered to evaluate the reliability of all other sub-systems. This will finally lead to development of a model to evaluate and improve the reliability of the main propulsion system.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2014, 8, 3; 367-371
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Study on applying the Catfish Biofuel in The Mekong Delta for The Marine Diesel Engine
Autorzy:
Quan, P. W.
Phuoc, H. T.
Powiązania:
https://bibliotekanauki.pl/articles/115953.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
Ship Propulsion
marine diesel engine
Catfish Biofuel
Mekong Delta
diesel oil
Exhaust Gas
Petrol Oil Replacement
biofuel
Opis:
The manufacturing of Catfish products has been developed rapidly in the Mekong delta. Every year, about 1.2 million tons of Catfish and 150,000 tons of biofuel are produced. The biofuel B100 manufactures in Mekong delta satisfies the America standard ASTM D6751; EURO EN 14214 or Vietnamese standard TCVN 7717. Mekong delta, a lower land area, has a large inland water way system with around 100.000 river boats that operate with marine diesel engine. Using the biofuel for the marine diesel engine in area will reduce the HC, CO, SOx and NOx emission to the environment. Therefore, with a study on applying the catfish biofuel, it will reduce the climate change by the increasing of sea water level and save energy by using green energy to replace petrol oil.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2015, 9, 4; 523-529
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Study on the Propulsion Performance in the Actual Sea by means of Full-scale Experiments
Autorzy:
Kayano, J.
Yabuki, N.
Sasaki, N.
Hiwatashi, R.
Powiązania:
https://bibliotekanauki.pl/articles/116354.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
Propulsion Performance
Propulsion
mechanical engineering
Energy Efficiency Design Index (EEDI)
Ship Energy Efficiency Management Plan (SEEMP)
Energy Efficiency Operational Indicator (EEOI)
Self Propulsion Factors
Power Curves
Opis:
The IMO has adopted Energy Efficiency Design Index (EEDI), Ship Energy Efficiency Management Plan (SEEMP) and Energy Efficiency Operational Indicator (EEOI) in order to reduce GHG emissions from international shipping. And, the shipping industry is required to develop and improve the energy saving ship operation technologies to meet the above IMO guideline. The weather routing is one of the energy saving navigation technologies and widely adopted by oceangoing merchant ships. The effectiveness of the weather routing mainly depends on the accuracy of weather forecast data and the ship’s propulsion performance prediction. The propulsion performance in the actual sea is usually predicted using the Self Propulsion Factors obtained by model tests. It is necessary to understand the propulsion performance characteristics in the actual sea conditions for the improvement of propulsion performance prediction. From the above points of view, the authors performed full‐scale experiments using a training ship in order to investigate the propulsion performance characteristics in the actual sea. This paper describes the analysis results on the characteristics of Power Curves and Self Propulsion Factors under various weather and sea conditions.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2013, 7, 4; 521-526
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An analysis 0f characteristics of ship gas turbine propulsion system (in the light of the requirements for ship operation in the Baltic Sea)
Autorzy:
Domachowski, Z.
Dzida, M.
Powiązania:
https://bibliotekanauki.pl/articles/962803.pdf
Data publikacji:
2004
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ship propulsion system
gas turbines
environment protection
Opis:
The paper concerns a propulsion system of merchant ships intended for sailing in the Baltic Sea zone. Such system is to satisfy the ecological requirements determined by relevant international conventions for special zones to which the Baltic Sea also belongs. The paper draws attention to gas turbine used as a prime mover for such ships, because it satisfies the ecological requirements and has also other advantages. Application of gas turbine for ship powering does not require exhaust gas to be purified, however it requires fuel oils of a low sulphur content to be used. If the ecological rules impose the using of the fuel oils of similar quality for diesel engines then gas turbine propulsion system will be comparable - also economically (regarding specific fuel oil consumption cost) - with that of diesel engine. It would be even more favourable in a combine gas turbine /steam turbine system, especially at compound production of electric and heat energy (i.e. COGES systems). In the Baltic Sea zone gas turbines willfind application to powering a. o. such ships as : fast car-passenger ferries, fast cargo ships, special vehicles (hydrofoils, hovercraft, motor yachts).
Źródło:
Polish Maritime Research; 2004, S 1; 73-78
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An application of intuitionistic fuzzy analytic hierarchy process in ship system risk estimation
Autorzy:
Nguyen, H.
Powiązania:
https://bibliotekanauki.pl/articles/244796.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
intuitionistic fuzzy sets
risk estimation
expert judgment
ship propulsion system
analytic hierarchy process (AHP)
sea transport
Opis:
In this paper, we extend the analytic hierarchy process (AHP) method and the Atanassov’s intuitionistic fuzzy set (IFS) into the intuitionistic fuzzy analytic hierarchy process (IFAHP) with application in ship system risk estimation. In the safety engineering, risk estimation is in practice confronted with difficulties connected with shortage of data. In such cases, we have to rely on subjective estimations made by persons with practical knowledge in the field of interest, i.e. experts. However, in some realistic situations, the decision makers might be reluctant or unable to assign the crisp evaluation values to the comparison judgments due to his/her limited knowledge. In other words, there is a certain degree of hesitancy in human cognition and his judgment. Taking advantages of IFSs in dealing with ambiguity and uncertainty into account, the IFAHP can be used to handle with the subjective preferences of experts, who may have insufficient knowledge of the problem domain or uncertainty in assigning the evaluation values to the objects considered. This paper also develops a new knowledge-based ranking method to derive the priority vector of the hierarchy. An illustrative example of the propulsion risk estimation of container carriers operating on the North Atlantic line is given to show the applicability and effectiveness of the proposed method.
Źródło:
Journal of KONES; 2016, 23, 3; 365-372
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An approximate method for calculating the mean statistical service speed of container ships on a given shipping line and its application in preliminary design
Autorzy:
Szelangiewicz, T.
Żelazny, K.
Powiązania:
https://bibliotekanauki.pl/articles/135192.pdf
Data publikacji:
2015
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
service speed
shipping lines
preliminary design
container ship
propulsion system
weather conditions
Opis:
During ship design, service speed is one of the crucial parameters in determining the operational economy of the vessel. As sufficiently exact calculation methods applicable to preliminary design stage are lacking, the so-called contract speed, the speed which a ship reaches in calm water, is usually cited. Żelazny (2015) developed a parametric method for calculating total ship resistance under actual weather conditions (wind, waves, sea current). This paper presents a parametric model of a ship’s propulsion system (screw propeller – propulsion engine) as well as a method, based on both the resistance and propulsion system models, of calculating the mean statistical value of a ship’s service speed under the seasonal weather conditions occurring on shipping lines. The method makes use only of basic design parameters, and may be applied in preliminary design phase of container ships.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2015, 44 (116); 34-42
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analyzing the feasibility of an unmanned cargo ship for different operational phases
Autorzy:
Røstum Bellingmo, P.
Wille, E.
Nordahl, H.
Mørkrid, O. E.
Holte, E. A.
Powiązania:
https://bibliotekanauki.pl/articles/24201463.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
autonomous ship
navigation
cargo handling
mooring
communication
power and propulsion
technical feasibility
regulatory feasibililty
Opis:
The maritime industry has begun to look into autonomous ships as an alternative to conventional ships due to growing pressure to reduce the environmental impact of maritime transportation, to increase safety, to mitigate the growing challenges in recruiting seafarers, and to increase profit margins. There is a lot of research on the challenges and feasibilities of an autonomous ship. However, there is less discussion on the transition from manned to unmanned ships and the tasks that are feasible to automate before the whole ship is unmanned. This paper investigates the technical and regulatory feasibility of automating different tasks for different operational phases for a large cargo ship. This study shows that a fully unmanned cargo ship is not feasible today, but that some tasks can be automated within the next five years.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2023, 17, 2; 397--404
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assisted propulsion device of a semi-submersible ship based on the magnus effect
Autorzy:
Lv, Jingze
Lin, Yiqun
Zhang, Rui
Li, Boyang
Hualin, Yang
Powiązania:
https://bibliotekanauki.pl/articles/32909218.pdf
Data publikacji:
2022
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
Flettner rotor
semi-submersible ship
wind energy
ship propulsion
numerical simulation
Opis:
The purpose of this study is to explore the potentiality of wind propulsion on semi-submersible ships. A new type of Flettner rotor (two rotating cylinders) system installed on a semi-submersible ship is proposed. The structure and installation of two cylinders with a height of 20 m and a diameter of 14 m are introduced. The numerical simulation of the cylinder is carried out in Fluent software. The influence of apparent wind angle and spin ratio on the two cylinders are analysed, when the distance between two cylinders is 3D-13D (D is cylinder diameter). When the distance between two cylinders is 3D, the performance of the system increases with an increase in spin ratio. Moreover, the apparent wind angle also has an effect on the system performance. Specifically, the thrust contribution of the system at the apparent wind angle of 120° is the largest at the spin ratio of 3.0. The maximum thrust reaches 500 kN. When the spin ratio is 2.5 and the apparent wind angle is 120°, the maximum effective power of the system is 1734 kW. In addition, the influence of the two cylinders distance on system performance cannot be ignored. When the distance between the two cylinders is 7D and the spin ratio is 2.5, the effective power of the system reaches a maximum, which is 1932 kW.
Źródło:
Polish Maritime Research; 2022, 3; 33-46
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Automatic control systems for ships fitted with podded propulsion drive (POD)
Autorzy:
Dymarski, C.
Dąbrowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/962799.pdf
Data publikacji:
2004
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ship propulsion
azimuthal propulsion
ship control systems
Opis:
The paper shows purposefulness and possiblity of automation of ship propulsion systems, especially those of POD type, intended to be used on four Baltic navigation ships: a containership, ro-ro ship, product tanker, as well as river-sea-going ship, designed within the frame of the Eureka "Baltecologicalship" project. Requirements of ship classification societies, and general ones for modern ship control systems were presented, as well as a review and analysis of currently applied power plant automation systems for diesel- electric ships fitted with podded propulsion drive (POD), were performed. Moreover real ways and possibilities of controlling ship s course and speed were indicated. Information contained in this paper may facilitate selecting appropriate design assumptions for a propulsion control system to be applied on the above mantioned ships.
Źródło:
Polish Maritime Research; 2004, S 1; 83-86
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 92

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