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Tytuł:
Kinematic of marine piston-crankshaft system
Autorzy:
Murawski, L.
Powiązania:
https://bibliotekanauki.pl/articles/246452.pdf
Data publikacji:
2015
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
marine propulsion system
piston-crankshaft kinematic
slow speed engines
inertia forces
propulsion system vibrations
Opis:
Two-stroke, slow speed main engines are often installed on merchant ships, because of its very high efficiency. That kind of engine has an output of about 5500 kW per cylinder. The mass of piston-crankshaft system reaches over a dozen tons. That reciprocating masses are source of high level of dynamic inertia forces (mass forces). Those forces have big influence on engines working parameters and characteristics. One of them is instability of crankshaft rotational speed, which leads to dangerous torsional vibrations of propulsion system. Some inconsistency can be observed during analysis of piston-crankshaft system kinematic. In the theoretical engine books, the piston speed and acceleration has only two harmonic components, the inertia forces are depended on engine rotation speed and they doubled rotation speed. However, empirical formulas, published by engines producers, give us at least five harmonic components of mass forces. The author tries to find out the theoretical reason of existing (measured) higher harmonic orders of engines inertia forces. It is a first step for developing monitoring system of propulsion system’s torsional vibrations coupled with axial vibration, dynamic shaft line alignment and crankshaft springing. In the paper two analytical methods of piston displacement, speed and acceleration are presented. Well-known (from literature) equations are compared with more-detailed analytical procedures. The analysis was performed for one of the biggest marine MAN B&W engine, type 7K98MC. A discussion about the analysis results was included in the final part of the paper.
Źródło:
Journal of KONES; 2015, 22, 2; 155-162
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis methods of crankshafts stiffness characteristics
Autorzy:
Murawski, L.
Charchalis, A.
Powiązania:
https://bibliotekanauki.pl/articles/244837.pdf
Data publikacji:
2013
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
marine engine
power transmission system
marine propulsion system
crankshaft springing
shaft line
boundary conditions
Opis:
Development of on-line diagnostic (monitoring) method of marine propulsion system working parameters is the authors' target. Crankshaft springing characteristics are one of the most important from the ships' main engines reliability point of view. Planned monitoring system will be able to verify crankshaft springing characteristics by continuous measurements of the crankshaft free-end's axial deformations. Development of the analysis methods of crankshaft's stiffness characteristics is the first step of planned SHM system. The main purpose of research is method developing of the springing analysis for the marine crankshafts in the high-power engines. Crankshaft modeling method, by Finite Element Method, has been discussed. Short overview of the crankshaft boundary conditions is presented. Bearings' oil film stiffness characteristics, ship hull stiffness characteristics and temperature deformation of the ship hull and main engine body are taking into account. Influence of the crankshaft's foundation stiffness on springing values is analysed. During the analyses it was proved that flexibility of engine foundation has a big influence upon the value of crankshaft springing. The authors' method of cylindrical mass and gas forces decompositions has been presented. Analysis of modeling precision of piston-crank system's forces has been performed. Results of calculations are well compatible in the terms of quality with the measurements data.
Źródło:
Journal of KONES; 2013, 20, 1; 219-226
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Charakterystyki okrętowych turbinowych silników spalinowych w stanach pracy ustalonej
The characteristics of marine gas turbines in stationary mode
Autorzy:
Pojawa, B.
Powiązania:
https://bibliotekanauki.pl/articles/222647.pdf
Data publikacji:
2011
Wydawca:
Akademia Marynarki Wojennej. Wydział Dowodzenia i Operacji Morskich
Tematy:
okrętowy turbinowy silnik spalinowy
okrętowy układ napędowy
charakterystyka
marine turbine internal-combustion engine
marine propulsion system
characteristic
Opis:
W artykule przedstawiono zagadnienia związane z eksploatacją okrętowych układów napędowych z okrętowymi turbinowymi silnikami spalinowymi, w szczególności dotyczące charakterystyk okrętowych turbinowych silników spalinowych w stanach pracy ustalonej. Zaprezentowano zagadnienia dotyczące ich podstaw teoretycznych oraz metod i sposobów wyznaczania. Pokazano również przykłady charakterystyk wyznaczonych podczas badań na stanowisku laboratoryjnym dwuwirnikowego turbinowego silnika spalinowego.
The paper presents problems related to running a marine propulsion systems based on gas turbine engines. In particular, it deals with the characteristics of marine turbine engines in stationary mode. It includes issues related to the theoretical fundamentals, methods and procedures used to determine them. It also shows examples of characteristics determined on a laboratory-based gas turbine engine.
Źródło:
Zeszyty Naukowe Akademii Marynarki Wojennej; 2011, R. 52 nr 4 (187), 4 (187); 83-102
0860-889X
Pojawia się w:
Zeszyty Naukowe Akademii Marynarki Wojennej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stiffness characteristics of main bearings foundation of marine engine
Autorzy:
Murawski, L.
Powiązania:
https://bibliotekanauki.pl/articles/247486.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
dynamic stiffness of main engine bearings
shaft line alignment
crankshaft springing
marine propulsion system numerical analysis
Opis:
During shaftline alignment and crankshaft springing analyses, knowledge of stiffness of radial bearings is essential. Dynamic stiffness's characteristics of marine main body are difficult to estimate because of lack of available documentation and complicated shape of the body. In the literature, there is a lack of the detailed data on the stiffness of the crankshaft foundation in the frame of marine main engine. Those parameters are crucial for the shaft line alignment analysis as well as for the analysis of interactions between the shaft line and the crankshaft. Especially for the high power engines, the correct model of the boundary conditions plays a key role during the analysis. The paper presents the methodology of the characteristics determination of the marine engine’s body as well as the example of computations for a MAN B&W K98MC type engine mounted on a ~3000 TEU container ship. The model of main engine body is relatively big – it contains over 800 thousand degree of freedom. The elasticity of ship hull has been estimated and taken into account during analysis. It has been found, that static stiffness parameters recommended by the producer for the shaft line alignment are evaluated correctly, however they represent only the flexibility of the engine’s body, not taking into account the flexibility of the ship’s hull. What is more, the dynamic magnification of vibration amplitudes is not taken into account.
Źródło:
Journal of KONES; 2016, 23, 1; 239-246
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The usage of the Miniature Dwarfs method in the improvement of passenger ship construction
Autorzy:
Chybowski, L.
Powiązania:
https://bibliotekanauki.pl/articles/135698.pdf
Data publikacji:
2017
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
Miniature Dwarfs
Method of Little Men
MLM
TRIZ
mental inertia
abstraction
modelling
marine propulsion system
passenger vessel
Opis:
The Miniature Dwarfs method is one of the tools used by the Theory of Inventive Problem Solving (TRIZ) used in the process of modelling and seeking solutions to conflicting situations. This article describes the origin of the Miniature Dwarfs method. The process flow of the usage of the Miniature Dwarfs method was presented both in its original version, suggested by Altshuller, as well as in its recently modified version. The usage of the Miniature Dwarfs method was presented here to minimize the marine hull resistance of a passenger ship in the conflicting situation, where there is a simultaneous necessity to provide both large ship capacity as well as high speed. The issue and the conflicting situation were both presented and modelled. The Operational zone and Operational time were described and modelled with the use of the Miniature Dwarfs method before and during the Conflict, and the desired situation. The search of the potential solutions was carried out with the use of miniature dwarfs; the findings were interpreted with respect to the system under analysis and the stated technical issues. Imagined situations described in individual diagrams are included in the issue under investigation. Selected solutions to the problem were presented. The advantages of the method were indicated and presented as an addition to other methods used in the process of designing new engineering solutions.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2017, 51 (123); 28-34
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Diagnostic of the piston rod gland’s failure of marine slow speed main engine
Autorzy:
Murawski, L.
Van Doan, D.
Powiązania:
https://bibliotekanauki.pl/articles/244395.pdf
Data publikacji:
2017
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
marine propulsion system
slow-speed main engine
failure of piston-crankshaft system
diagnostic based on vibrations
displacement
stress level
Opis:
The article presents untypical diagnostic of the slow-speed, marine main engine. The engine was newly made-up and checking during mounting process and during sea trial. However, a leak under piston chamber of second cylinder along the piston rod appeared few days after the sea trial. The stuffing box exchange (with the piston rod’s regeneration) did not give expected results − the failure happened again. All geometrical and exploitation parameters was in acceptable range. The ship with main engine was fifth in the series of sister ships. The authors were asked for urgent expert opinion. Mix of different measurements was planned after formulation several hypothesis. Displacements of piston rod and cylinder, a stress level of main engine body, and vibrations level in different points of main engine was performed during short sea voyage. Not a single hypothesis can be considered as the main cause of the failure. It turns out, that a serious failure need not be caused by a single reason. According to snowball theory a sum of small effects, each of them affecting slightly the engine operation, can be a cause of serious failure. In the authors’ opinion, the failure was caused by a sum of relatively slight effects. The probably scenario of the failure process was enunciated. The recommendation for the engine project was formulated: some of the geometrical tolerances should be changed.
Źródło:
Journal of KONES; 2017, 24, 4; 203-210
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vibrations in Marine Power Transmission System
Drgania okrętowych układów przeniesienia napędu
Autorzy:
Doan, D.
Murawski, L.
Powiązania:
https://bibliotekanauki.pl/articles/342083.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Morski w Gdyni. Wydawnictwo Uniwersytetu Morskiego w Gdyni
Tematy:
marine propulsion ship vibrations
torsional vibration
marine propulsion system
finite element method
drgania okrętowych układów napędowych
drgania skrętne
okrętowe układy napędowe
metoda elementów skończonych
Opis:
Vibration analyses of marine machines and structures are one of the most important during the design process as well as during exploitation. Vibrations of ship hull (including superstructure and main engine body) are separately analysed from the vibrations of power transmission system. Vibrations of propulsion system include three types: lateral vibration, coupled axial vibration and torsional vibration. Among them, torsional vibrations are usually the most dangerous for the shaft line and the crankshaft. These vibrations may cause the increasing failure of the engine crankshaft as broken and bent shaft. Therefore, this article focuses on the study of torsional vibration of ship propulsion system. Calculation of torsional vibration of propulsion system with a medium-speed main engine is presented. The analysis is based on finite element method, with the code written in Matlab software. The result of this paper is applied for the tugboat with the engine of power 350 HP.
Analizy drgań okrętowych maszyn i konstrukcji są jednymi z najważniejszych podczas procesu projektowania oraz ich eksploatacji. Drgania kadłuba statku (z nadbudówką i korpusem silnika głównego włącznie) są analizowane oddzielnie od drgań układu przeniesienia napędu. Wyróżnia się trzy typy drgań układu napędowego: drgania giętne, sprzężone wzdłużne oraz skrętne. Wśród nich drgania skrętne są zwykle najgroźniejsze dla linii wałów wału korbowego. Mogą one zwiększyć prawdopodobieństwo uszkodzenia wału korbowego poprzez jego złamanie lub wygięcie. Z tego powodu w artykule skupiono się na analizie drgań skrętnych okrętowych układów napędowych. Zaprezentowano obliczenia drgań skrętnych układu napędowego wyposażonego w średnioobrotowy silnik główny. Analizę przeprowadzono metodą elementów skończonych, której procedura została napisana w programie Matlab. Zastosowano ją do obliczeń holownika wyposażonego w silnik o mocy 350 HP.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Gdyni; 2017, 100; 37-50
1644-1818
2451-2486
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Gdyni
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wybrane aspekty nauczania zasad eksploatacji okrętowych układów napędowych z prądnicami wałowymi
Selected aspects of teaching operation procedures for marine propulsion systems with shaft generators
Autorzy:
Chybowski, L.
Wiśnicki, B.
Powiązania:
https://bibliotekanauki.pl/articles/113035.pdf
Data publikacji:
2015
Wydawca:
STE GROUP
Tematy:
kształcenie inżynierów
okrętowy układ napędowy
system energetyczny statku
prądnica wałowa
procedury eksploatacyjne
symulator siłowni okrętowej
education of engineers
marine propulsion system
marine power plant
shaft generator
operation procedure
engine room simulator
Opis:
Materiał omawia celowość stosowania prądnic wałowych w okrętowych układach napędowych. Dokonano porównania warunków pracy układu podczas pracy w trybie generatorowym i silnikowym. Omówiono podstawowe sposoby sterowania częstotliwością prądu Elektrycznego generowanego przez te układy napędowe. Omówiono pracę silnikową w rozwiązaniu wspomagającym, awaryjnym oraz kombinowanym. Przedstawiono spotykane na statkach morskich konfiguracje elementów układów napędowych z prądnicami wałowymi. Wskazano na przydatność zastosowania symulatorów siłowni okrętowej w procesie nauczania zasad eksploatacji tego typu układów. Omówiono procedury eksploatacyjne oraz wyszczególniono podstawowe parametry techniczne układu napędowego z prądnicą wałową zaimplementowaną w symulatorze siłowni okrętowej Kongsberg Neptune będącym na wyposażeniu Instytutu Eksploatacji Siłowni Okrętowych Akademii Morskiej w Szczecinie.
The paper discusses the purpose of application of shaft generators in marine propulsion systems. A comparison of operation conditions is made between the Power Take Off and Power Take In modes. Basic methods of current frequency control generated by these propulsion systems are discussed. Engine operation in booster, emergency and take me home modes are addressed. Configurations of propulsion systems with shaft generators installed on marine ships are presented. The usefulness of application of engine room simulators to teach operation principles of these systems is indicated. Operation procedures are discussed and basic technical parameters are specified for the propulsion system with a shaft generator implemented in engine room simulator Konsberg Neptune owned by the Institute of Ship Power Plant Operation, Maritime University of Szczecin.
Źródło:
Systemy Wspomagania w Inżynierii Produkcji; 2015, 2 (11); 64-76
2391-9361
Pojawia się w:
Systemy Wspomagania w Inżynierii Produkcji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vibrations resonance estimation in marine structures
Autorzy:
Murawski, L.
Powiązania:
https://bibliotekanauki.pl/articles/247863.pdf
Data publikacji:
2014
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
vibration
dynamic analysis
marine structures
propulsion system
crankshaft
resonance
Opis:
Dynamic analyses of marine structures are one of the most important during design process as well as during exploitation. Typically, two parts of vibrations calculations are performed. Firstly, natural vibrations frequencies and modes are determined. Forced vibrations analysis is the second step of calculations. Natural vibrations give us information about possibility (e.g. at which main engine speed) of dangerous vibrations amplitudes (resonances threat). Exact values of vibrations amplitudes are results of forced vibrations analysis. Confidence level (error value) of forced vibration calculations is much lower in comparison to uncertainty of natural vibration analysis. What is more, form engineering practice point of view, natural vibrations frequencies estimation (resonance avoidance) is the most important during dynamic analysis of marine structures with propulsion systems. In the paper some examples of dynamic characteristics estimation and their changing methods (possibility) was presented. Utility of relatively simple models, with low degree of freedom number, was discussed. Modelling methods depending on the analysis target of marine slow-speed crankshafts was presented. Advantages and disadvantages of subcritical and supercritical design of marine propulsion system were discussed. An example of propulsion system natural torsional vibrations simplified analysis was presented. Location of the main torsional resonance is one of the most important decisions during design process of the marine propulsion system. Methods of fast and easy estimation as well as changing possibility of natural vibrations frequencies of marine structures is the main objective of presented paper.
Źródło:
Journal of KONES; 2014, 21, 1; 175-182
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of shaft line alignment accuracy on the operational reliability of marine propulsion systems
Autorzy:
Murawski, L.
Powiązania:
https://bibliotekanauki.pl/articles/241911.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
shaft line alignment
marine propulsion systems
propulsion system's bearings damages
operating parameters of the power transmission system
Opis:
The paper presents a method of identification parameters of shaft line alignment and its influence on operational reliability of marine propulsion system. The discussion about shaft line parameters (bearings' reactions, bending moment and shear forces acting on crankshaft or gear box, and stresses distribution in the shaft line) which has an influence on marine propulsion system reliability was presented. Proper shaft line alignment is often a problem for repair shipyards, for aged ships without sufficient documentation. Some data can be draw by measurements; e.g. shaft line dimensions or intermediate bearings' reactions. Other data (stern tube bearing load, real axis of shaft line) have to be determined on the base of calculations. Author proposed combined experimental-analytical method for identified and optimization (correction) some existing parameters and checking power transmission system’s foundation. Specialised software (based on Finite Element Method) has been developed for shaft line alignment calculations. Main novelties of the software are elastic supports (model of bearings – boundary conditions) of the shaft line, continuous support as a model of stern tube bearing and influence coefficients calculations. An example analysis with discussion has been performed for cargo ships with medium-speed main engine. Multi-variant computations supported by measurements of the ships’ shaft line have been carried out. Changes in shaft line alignment have been proposed in order to increase reliability of propulsion system.
Źródło:
Journal of KONES; 2016, 23, 1; 247-254
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of marine main engine foundations on the results of vibration calculations
Autorzy:
Murawski, Lech
Powiązania:
https://bibliotekanauki.pl/articles/241815.pdf
Data publikacji:
2019
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
marine engines
shaft line alignment
crankshaft springing
boundary conditions
propulsion system
Opis:
The article presents an influence of foundations of slow-speed main engine body on the results of numerical analysis of the engine dynamic stiffnesses and thermal deformations. The engine body is much stiffer than its foundation pads and ship hull (double bottom) – boundary conditions of the engine. Especially for the high power, marine engines, the correct model of the boundary conditions plays a key role during the analyses. Therefore, modelling method of engine foundation (boundary conditions) of that kind of model is essential during the analyses. During shaft line alignment and crankshaft springing analyses, knowledge of dynamic stiffnesses characteristics and thermal displacements of radial (main) bearings is significant. Those data of marine main engine body are difficult to estimate because of lack of available documentation and complicated shape of the engine and ship hull. The article presents the methodology of the characteristics determination of the marine engine’s body as well as the example of computations for a MAN B&W K98MC type engine (power: 40000 kW, revolutions: 94 rpm) mounted on a 3000 TEU (twenty-foot container equivalent unit) container ship (length: 250 m). Numerical analyses were performed with usage of Nastran software based on Finite Element Method. The FEM model of the engine body comprised over 800 thousand degree of freedom.
Źródło:
Journal of KONES; 2019, 26, 1; 95-101
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance and emission modelling and simulation of marine diesel engines using publicly available engine data
Autorzy:
Ghaemi, Mohammad Hossein
Powiązania:
https://bibliotekanauki.pl/articles/2033202.pdf
Data publikacji:
2021
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
marine diesel engine
mathematical model
Mean-Value Model
simulation of ship propulsion system
Opis:
To analyse the behaviour of marine diesel engines in unsteady states for different purposes, for example to determine the fuel consumption or emissions level, to adjust the control strategy, to manage the maintenance, etc., a goal-based mathematical model that can be easily implemented for simulation is necessary. Such a model usually requires a wide range of operating data, measured on a test stand. This is a time-consuming process with high costs and the relevant data are not available publicly for a selected engine. The present paper delivers a rapid and relatively simple method for preparing a simulation model of a given marine diesel engine, based only on the widely available data in the project guides indicated for steady state conditions. After establishing the framework of the mathematical model, it describes how the parameters of the model can be adjusted for the simulation model and how the results can be verified as well. Conceptually, this is a trial and error method, but the presented case example makes clear how the parameters can be selected to reduce the number of trials and quickly determine the model parameters. The necessary descriptions are given through a case study, which is the MAN-B&W 8S65ME-C8 marine diesel engine. The engine is assumed to be connected to a constant pitch propeller. The presented mathematical model is a mean-value zero-dimensional type with seven state variables. The other variables of the engine are determined based on the state independent variables and the input value, which is the fuel rate. The paper can be used as a guideline to prepare a convenient mathematical model for simulation, with the minimum publicly available data.
Źródło:
Polish Maritime Research; 2021, 4; 63-87
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Monitoring system of extreme loadings of propulsion system’s foundation : design assumptions
Autorzy:
Kyzioł, L.
Murawski, L.
Powiązania:
https://bibliotekanauki.pl/articles/242588.pdf
Data publikacji:
2013
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
marine structural health monitoring
propulsion system diagnostic
marine engines’ foundations
underwater explosion
ship grounding
optical time-domain reflectometer
Fibre Bragg Grating
Opis:
Project of on-line diagnostic (monitoring) system of marine propulsion system working parameters is the authors' general target. Proper propulsion system’s foundation is one of the most important parameters for its reliable operation. Different types of quasi-static loadings and dynamic excitations can be observed during ships exploitation. Presented research has been limited to extreme loadings. Underwater explosions or ship groundings are considered examples of extreme foundation loadings. Analysis of the physical parameters of the extreme forces has been presented in the first part of the paper. Water pressure spatial and non-spatial (time) distribution during underwater explosion has been analysed as an example. Short overview of the dynamic mathematical models of underwater explosions is presented. Time function of vibrations acceleration of ship construction is important design assumption of planned Structural Health Monitoring (SHM) system. Propulsion system's foundation loading measurements should take into account general ship hull deformation (in the aft part of the ship) as well as reactions changes of main engine and shaft line bearings. Ship hull deformation should be monitored as quasi-continuous measurements, along whole propulsion system. Optical Time-Domain Reflectometer method (OTDR) is planned for hull deformation monitoring. Propulsion system bearings' reactions are a source of local foundation pads' strain changes. Fibre Bragg Grating (FBG) sensors are the best for that kind of measurements, in authors opinion. Both techniques (OTDR and FBG) have been shortly described in the paper. Scheme of monitoring system of marine propulsion systems foundation's loadings are proposed in the end of the article.
Źródło:
Journal of KONES; 2013, 20, 1; 155-162
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The increase of operational safety of ships by improving diagnostic methods for marine diesel engine
Autorzy:
Witkowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/117520.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
diagnostic methods
marine diesel engine
main engine
ship propulsion
operational safety
injection system
damage
fuel oil
Opis:
This article shows the importance of the diagnostic improvement methods of marine engines to boost the economy and safety of operation of marine cargo ships. The need to implement effective diagnostic methods is justified by presenting statistical data of marine diesel engines failure and the cost of their operation. Based on the own research has been proven, for the chosen example, that indicator diagrams and analysis of indicated parameters have limited utility in the diagnosis of damages of marine engine, although this is a method commonly used in operational practice. To achieve greater diagnostic effectiveness, when, based on indicator diagrams, are calculated and then the characteristics of heat release is analyzed - net of heat release characteristics and the intensity of the heat release, it was demonstrated. This procedure is particularly effective in the diagnosis of damage of injection system components marine diesel engine.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2017, 11, 2; 317-321
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improving the Efficiency of a High Speed Catamaran Through the Replacement of the Propulsion System
Autorzy:
Melo, G.
Echevarrieta, I.
Serra, J. M.
Powiązania:
https://bibliotekanauki.pl/articles/116469.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
Ship Propulsion
Propulsion System
High Speed Catamaran
High Speed Craft (HSC)
MARPOL Annex VI
Energy Efficiency Operational Index (EEOI)
Marine Gas Oil (MGO)
Improving the Efficiency
Opis:
The high speed vessels are primarily designed for short distances services as public transport of passengers and vehicles. The range of high speed, according to the Code of high-speed vessels begins at 20 knots, which depends on the cruise speed you desire for your vessel; you will have to use the most appropriate type of propellant. In general, in the past 20 years, they have been building high-speed vessels with speeds above 33 knots, which meant installing water jet propellants coupled to powerful engines and therefore of high consumption of fuel, increasing operating costs and causing increased air pollution. Although the prices of fuel have been reduced to half, due to the sharp fall in oil prices, the consumption of fuel and the air pollution remains high at these speeds and powers used, in addition to that the reduction of the time spent on each trip is not excessive, mainly in short routes that are less than an hour . This article is about adapting a ship of high-speed service, with a maximum speed in tests of 34 knots and to reduce its operating costs (fuel, maintenance, etc.) and make it economically viable; before the transformation, this vessel was operating with a service speed of 22 knots, and with a consumption per mile of 135 litters of MGO. The transformation process has consisted by: – Replacement of the two original water jet with four shaft lines with fix pitch propeller. – Replacement of the two original main engines (2 x 6500 kW = 13000 kW) by four engines (4 x 1380kW = 5.520 kW). – Changing the underwater hull shape to fit the new propellers and maximize its efficiency. – Relocation of auxiliary engines, to achieve the most efficient trim. – Installation of two lateral propellers to improve maneuverability and shorten the total time of journey. After the reform and the return to service of the vessel with a service speed of over 22 knots, it has been verified that the consumption per mile is of 45 litters MGO, representing a reduction of 65% of consumption and even more reduction of emissions as the new engines comply with the latest regulations.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2015, 9, 4; 531-535
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 18

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