Temat: propulsion system - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Possibilities of improving safety and reliability of ship propulsion system during dp operations
Autorzy:: Herdzik, I.
Tematy:: propulsion system
dynamic positioning operation
reliability
safety
propulsion system solutions; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/247846.pdf Link otwiera się w nowym oknie
Opis:: Improving safety and reliability of ship propulsion system during dynamic positioning (DP) operations of multipurpose vessels is an essential advantage. It may be such possibilities obtained by application the considered solutions of propulsion systems and all other elements of energetic system. The minimum requirements were determined by creating the regulations of dynamic positioning systems and their levels. Applying the solutions, which were exceeded the limits of basic requirements, allows to increase the safety and reliability levels with a low rise the investment costs. Many marine companies try to invent so low cost solutions. An example analysed in the paper is the Wartsila LCC system. The applications of more complicated solutions in comparison to required duplicated systems are expensive. The cheaper solution is an investing in the development of automatics configurations (for those systems it was applied the triple and quadruple configurations) which in transient or emergency conditions may obtain the time delay making possible a support of industry part work and DP systems. In emergency situation, after the loss of position by DP system, the power management system allow the safe break of work the industry part and return to work after elimination the critical condition.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Challenges of ship propulsion systems during DP operations
Autorzy:: Herdzik, I.
Tematy:: propulsion system
challenge
dynamic positioning operation
safety of propulsion system
energy storage devices; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/247849.pdf Link otwiera się w nowym oknie
Opis:: Ship propulsion configurations with dynamic positioning systems are commonly used as diesel-electric. In particular, situations for ship transfer on longer distances may be used conventional mechanical propulsion system with controllable pitch propeller. Combination of mechanical and electric propulsion system called hybrid propulsion is met as well, where the thrusters of DP systems are driven through the gear by mechanical engine or electric motor independent or both. For the sake of the necessity of limitation of total installed power on the ship may occurred problems with power distribution between the ship propulsion and industry part. It will especially concern those situations when we need to keep power supply to the industry part and there is a necessity to increase the power delivered to ship propulsion part for the purpose of keeping the ship position or heading. The primary task of power management system (PMS) is blackout prevention in ship energetic network and so power distribution to overcome critical conditions of it. Temporarily it may occur the worsening of positioning operation accuracy without any critical situations of industry part. The possibility of momentary overloading of energetic network is primary condition of safety. The critical duration of overloading is one minute. This is indispensable time for increasing the accessible power in the energetic system through switching on the next genset to work. It is a necessity of quick analysis in critical conditions to value what key-actions ought to do in the aim of overcoming emergency situations. The next one is a usage of energy storage devices. It is possible through AC/DC conversion. It was tried to find solutions of equalization the load of gensets to the ship electric energy demand.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Analysis of propulsion system failures in the fishing fleet operating from Polish ports
Analiza awarii układów napędowych floty rybackiej operującej w oparciu o polskie porty
Autorzy:: Behrendt, C.
Rajewski, P.
Tematy:: fishing
fishing boat
propulsion
failures
propulsion system; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Technologii Eksploatacji - Państwowy Instytut Badawczy
Powiązania:: https://bibliotekanauki.pl/articles/256120.pdf Link otwiera się w nowym oknie
Opis:: Part of the research work on "Fishing craft modernization program for the reduction of power consumption and minimization of environmental impact" funded by the EU is an analyses of fishing vessel power systems. Failures occurring in the propulsion systems of Polish fishing boats and cutters are analyzed, covering the years 1999-2007. The effect of the failures on the marine environment has been assessed.
Artykuł oparty jest o dane zebrane w ramach wykonywania pracy badawczej "Program modernizacji jednostek rybackich w aspekcie zmniejszenia nakładów energetycznych i oddziaływania na środowisko" w ramach grantu UE. W artykule przedstawiono analizę awarii układów napędowych polskiej floty rybackiej, tj. łodzi i kutrów rybackich, które to awarie miały miejsce w latach 1999-2007. Oceniono wpływ zaistniałych awarii na zagrożenie dla środowiska morskiego.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Simulation of the hybrid propulsion system for the small unmanned vehicle
Autorzy:: Polak, F.
Walentynowicz, J.
Tematy:: unmanned vehicle
hybrid propulsion system; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/244497.pdf Link otwiera się w nowym oknie
Opis:: The paper presents a simulation model of an unmanned vehicle propulsion system designed and constructed at the Laboratory of Internal Combustion Engines WAT. The vehicle was modelled in the software environment AMESim. It is intended as a tool for modelling of mechatronic systems, and therefore it was possible to create a link between mechanical parameters such as gears, with elements from the fields of electrical engineering and electronics, such as electric motors and inverters. Presented undercarriage system modelled the platform with 6x6 and independent drive wheels. Presented model of the hybrid structure of a small unmanned vehicle and sub models driver module and the propulsion module battery charging electric current through a combustion engine (generator controls, the switching of electric current battery capacity following a drop below the desired value - for this calculation was 50% of battery capacity). Characteristics of parameters changes of sets are presented. Simulation study for two batteries of different capacities as an example of the synthetic driving test and analyzed the differences between the foundation and set of characteristics. It was found that the higher-capacity battery could provide a better change of speed.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Environmentally friendly fuel system for liquefied gas carrier propelled with 45 MW main propulsion plant
Autorzy:: Górski, Z.
Cwilewicz, R.
Krysiak, M.
Tematy:: natural gas ship propulsion
COGES propulsion system; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/246132.pdf Link otwiera się w nowym oknie
Opis:: This paper describes the problem of improvement in environment protection by application "environment friendly" fuel natural gas for ship propulsion. In thepaper the most suitable type of ship main propulsion system using natural gas was take into consideration. Propulsion using Iow speed diesel engine, medium speed diesel engine, steam turbine and combined systems were taken into consideration. As a result of analysis it was affirmed that COGES (Combined Gas Turbine and Steam Turbine Integrated Electric Drive System) is the most suitable propulsion plant to be fed with natural gas in contrary to ship diesel engines which adaptation to natural gas use still is in initial condition. COGES type propulsion plant consists in thermodynamic join of gas turbines and steam turbines. Ali turbines drive generators ofmain ship power station supplying simultaneously electric power to ship main propulsion electric motors and to ship electric network as well. It is suggested to use natural gas as fuel for gas turbines. Steam turbines are driven by steam produced in boilers warmed by gas turbines exhaust gases. This way a high efficiency of ship propulsion is obtained. The simplest source of natural gas is cargo carried by LNG (Liquefied Natural Gas) carriers. The preliminary project of such a carrier fuel system is presented in the paper. In addition conditions of application, advantages and disadvantages of natural gas fuel system are discussed.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Kinematic of marine piston-crankshaft system
Autorzy:: Murawski, L.
Tematy:: marine propulsion system
piston-crankshaft kinematic
slow speed engines
inertia forces
propulsion system vibrations; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/246452.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: A design concept of main propulsion system with hydrostatic transmission gear for inland waterways ship
Autorzy:: Dymarski, C.
Skorek, G.
Tematy:: inland ships
hydrostatic propulsion system; Pokaż więcej
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Powiązania:: https://bibliotekanauki.pl/articles/260451.pdf Link otwiera się w nowym oknie
Opis:: This analysis is aimed at presentation of a design concept of ship’s main propulsion system and determination of its total efficiency. To realize the task it is necessary to have a look at description of energy losses and efficiency of hydrostatic transmission gear, with taking into account its possible simplification. Image of mutual interaction of losses generated in all elements of hydraulic system appears very complex. In this paper energy balance of main propulsion system with hydrostatic transmission gear intended for a segment ship for inland waterways and coastal service, was analyzed under assumption of necessary simplifications.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: The effect of hull biofouling on parameters characterising ship propulsion system efficiency
Autorzy:: Tarełko, W.
Tematy:: ship
hull
biofouling
propulsion system
efficiency; Pokaż więcej
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Powiązania:: https://bibliotekanauki.pl/articles/259814.pdf Link otwiera się w nowym oknie
Opis:: One of most important issues concerning technical objects is the increase of their operating performance. For a ship this performance mainly depends on the efficiency of its main propulsion system and the resistance generated during its motion on water. The overall ship resistance, in turn, mainly depends on the hull friction resistance, closely related with the presence of different types of roughness on the hull surface, including underwater part biofouling. The article analyses the effect of hull biofouling on selected parameters characterising the efficiency of the ship propulsion system with adjustable propeller. For this purpose a two-year research experiment was performed on a sailing vessel during its motor navigation phases. Based on the obtained results, three groups of characteristics were worked out for different combinations of engine rotational speed and adjustable propeller pitch settings. The obtained results have revealed that the phenomenon of underwater hull biofouling affects remarkably the parameters characterizing propulsion system efficiency. In particular, the development of the biofouling layer leads to significant reduction of the speed of navigation.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: An algorithm for determining permissible control inputs to unmanned Underwater Robotic Vehicle (URV) fitted with azimuth propellers
Autorzy:: Garus, J.
Tematy:: underwater vehicle
propulsion system
azimuth propeller
control; Pokaż więcej
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Powiązania:: https://bibliotekanauki.pl/articles/259529.pdf Link otwiera się w nowym oknie
Opis:: The paper deals with synthesis of automatic control system for an unmanned underwater robotic vehicle. The problem of determining permissible propulsive forces and moments necessary for optimum power distribution within a propulsion system composed of azimuth propellers (rotative ones). To allocate thrusts the unconstrained optimization method making it possible to obtain a minimum-norm solution, was applied. A method was presented for assessing propulsion system capability to generate propulsive forces (set control inputs). For the case of lack of such capability an algorithm was proposed making modification of their values and determination of feasible propulsive forces (i.e. permissible control inputs), possible. A numerical example which confirmed correctness and effectiveness of the proposed approach, was also attached.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

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.
Tematy:: ship propulsion system
gas turbines
environment protection; Pokaż więcej
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Powiązania:: https://bibliotekanauki.pl/articles/962803.pdf Link otwiera się w nowym oknie
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).
Dostawca treści:: Biblioteka Nauki

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