Temat: Marine Transport - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Analysis of application of chosen methods for tdc determination in marine diesel engines
Autorzy:: Łutowicz, M.
Powiązania:: https://bibliotekanauki.pl/articles/245396.pdf
Data publikacji:: 2009
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: diesel engine
transport
marine diesel engine
indication
TDC
Opis:: In the operating marine diesel engines the indication diagnostics tests are usually performed through a 0.5-1.0 me ter long indication channel which delays and disfigures the pressure signal being measured. the delay depends on the engine 's speed and load. the pressure sensor itself together with an amplifler is an additional source of delay and disfigurements, so the registered pressure curve is displaced even if theTDC piston's position hadbeen estimated with the highest accuracy. when the over exploited engine is being tested the angle of delay can achieve several degrees and differ for each cylinder. in that case cylinders' load is unequal and torsional vibrations occur in the engine operation. in case when some simplifying assumptions have been adopted the part of diagnostic information is lost what could lead to a false diagnosis. in the paper the attention is focused on the mistakes which could be made in the marine diesel engine diagnostics when different TDC assessment methods are used. TDC corrections with compression pressure analysis are possible only in case when crankshaft angle position is precise. in case of measurement with constant frequency such corrections are possible only when the engine is good balanced.
Źródło:: Journal of KONES; 2009, 16, 4; 301-306
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Evaluation of applied provisions and technologies on ship emission and air quality
Autorzy:: Pawlak, M.
Powiązania:: https://bibliotekanauki.pl/articles/243593.pdf
Data publikacji:: 2016
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: transport
exhaust emission
marine engines
air pollution
modelling
Opis:: Although perceived as the most environmentally friendly means of transport, ships are a significant source of pollution to the environment. The vast majority of emissions in EU sea areas are emitted from cargo ships over 500 GT. About 45% of all emissions come from EU flagged ships and approximately 20% of emissions are emitted within the 12-mile limit of territorial seas. In port cities, ship emissions are in many cases a dominant source of pollution and need to be addressed when considering compliance with legally binding air quality objectives. Moreover, emissions from ships travel over hundreds of kilometres and can thus contribute to air quality problems on land even if they are emitted at sea. This is particularly relevant for the deposition of sulphur and nitrogen compounds, which cause acidification of natural ecosystems and threaten biodiversity through excessive nitrogen inputs. Emission of toxic compounds in marine engines exhausts is limited by international legal provisions, namely MARPOL convention, which in Annex VI sets limits to SOx and NOx emissions and designates special areas where the limits are stringent. To comply with the provisions, marine vessels need to be equipped with installations reducing emissions to permissible levels or turn to alternative fuels. The paper presents evaluation of impact of those having been in force for the last decade limitations as well as of applied new technological solutions on improvement of air quality. The analysis was conducted for the Baltic Sea, based on available data on ship traffic in the area and emission factors.
Źródło:: Journal of KONES; 2016, 23, 4; 381-388
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Modelling of alkalinity changes in lubricating oils used in marine diesel engines
Autorzy:: Młynarczak, A.
Powiązania:: https://bibliotekanauki.pl/articles/242269.pdf
Data publikacji:: 2009
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: transport
marine diesel engines
total base number
refilling process
Opis:: As the time is passing, lubricating oil in marine engine lubricating oil system loses its quality because of oil deterioration process. Lubricating oil quality influences the wear of tribological system elements. The total base number (TBN) is one of the most important oil quality properties. During operation of diesel engines the TBN decreases as alkaline additives are exhausted mainly through neutralization offuel burning acid products. So as to improve lubricating oil properties an engineer uses some maintenance methods. One of these methods is refilling process. The paper presents theoretical researches of total base number changes modelling at various lubricating oil refilling methods. Theoretical model of oil-deterioration process was worked out on the basis ofmass balance equation of total base number. The method of sofaing the problem, structural model of experimental unit, total base number change in case of constant refilling process, calculating example, total base number changes in PIELSTICK12PC2-5V engine oil versus parameter d, percentage changes of total base number in PIELSTICK 12PC2-5V engine oil versus parameter d are presented in the paper.
Źródło:: Journal of KONES; 2009, 16, 2; 329-335
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Resistance of idle propellers in marine multi-propeller propulsion systems
Autorzy:: Charchalis, A.
Powiązania:: https://bibliotekanauki.pl/articles/247530.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: transport
high speed vessels
marine propellers
multi-propeller propulsion systems
Opis:: The configuration of a marine propulsion system is selected with regard to the maximum power resulting from its maximum design speed and displacement. The propulsion systems of high speed vessels use three or even four propellers, and each propulsion unit may be multi-engine. High speed vessels are designedfor maximum speeds, but their factual exploitation speed parameters are usually considerably lower - partial speed. In such cases particular propulsion propellers and engines need to be shut down. The idle propellers are dragged by the hull and they work in the so-called turbine work mode; they transfer torque to the shaft and generale negative thrust, i.e. additional resistance. Additional resistance contributes to reducing estimated speed of a vessel and increasing fuel consumption. What is more, torque generated on a propeller is transferred to the shaft and when friction resistance torque in shaft stuffing-boxes and bearings, transmission and, possibly, the propulsion engine is exceeded, mobile components rotate as a result, reaching considerable rotational speed values. torque and thrust on a propeller in this work mode may be estimated on the grounds of universal hydrodynamic characteristics of propellers. Universal hydrodynamic characteristics of propellers are used as reversion characteristics in evaluating the steering properties ofa vessel, and may be useful in evaluating resistance of free wheeling and locked propellers in marine multi-shaft propulsion systems. This paper presents charts of universal hydrodynamic characteristics of propellers for the full range of their rotational speed, the methodology and an example of calculating resistance of free wheeling and locked propellers for the given marine propulsion system.
Źródło:: Journal of KONES; 2010, 17, 4; 97-102
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Speed irregularity characteristic of low speed, two-stroke marine diesel engine applied as vessels main propulsion
Autorzy:: Kowalak, P.
Powiązania:: https://bibliotekanauki.pl/articles/244760.pdf
Data publikacji:: 2008
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: transport
marine diesel engines
combustion processes
speed measurement
speed irregularity
Opis:: The piston engine irregularity is a consequence of the uneven power supply from the engine units. As such, it contains valuable information about engines units working process. Unfortunately, it is strongly influenced by torsional vibration, resonance, and propeller behaviour. In order to better understand the speed irregularity phenomena the instantaneous speed was recorded and its characteristic against engine mean speed was developed. Some statistical parameters: standard error and deviation as well as variance were determined. The results were compared with propulsion plant torsional vibration. The presented results show that the irregularity of the long stroke engine's speed is strongly influenced by torsional vibration phenomena. The analyzed engine has a bared speed range 37-43 rpm. Exactly around that range, the speed irregularity reaches its maximum values of 18% of mean speed. The analysis can be considered as qualitative look into the phenomena. However even based on the presented analysis one can observe some practical inferences. The common type of electronic indicators is used to simplify the measurement by assuming that the shaft speed is equal in between the pickup pulses. In order to increase the accuracy of the indicated power determination the use of such instrument should be avoided in the speed range, which is a multiple number of the barred speed. Due to the fact that the shaft speed is irregular especially in the ranges where torsional resonance may occur the piston positioning (for example for TDC determination) purpose procedure should take it into account.
Źródło:: Journal of KONES; 2008, 15, 4; 263-268
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: The dynamic TDC assigning on the marine four stroke engines indication diagram
Autorzy:: Kowalak, P.
Powiązania:: https://bibliotekanauki.pl/articles/243233.pdf
Data publikacji:: 2007
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: transport
marine diesel engines
combustion processes
power estimation
determination of piston's TDC
Opis:: Determination of the internal combustion piston engine 's indicated power is a complex task. A number of difficulties lead to lots of solutions utilized to increase the accuracy of the result. This paper reports on the experiments concerned with a four stroke engine's piston dynamic position determination. Although the paper is mostly concerned with the piston's TDC definition, the experimental methodology can be utilized in the entire piston movement determination. A specially developed measuring assembly and its working principle utilized in the experiment have been presented too. It allows the acquiring of a set of time-position coordinates. Based on the coordinates, the mathematical algorithm for dynamic piston positioning can be developed. As the piston movement was being observed from the crankcase side, the methodology proved to be relatively cheap and easier for installation, compared to proximity sensors installed in the cylinder head. The advantage of optical sensors and light pipes being used was reduction of the explosion risk in oil mist environment inside the crank case.
Źródło:: Journal of KONES; 2007, 14, 2; 259-266
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Problem śrub niepracujących w okrętowych układach napędowych wielośrubowych
Resistance of idle propellers in marine multi-propeller propulsion systems
Autorzy:: Charchalis, A.
Powiązania:: https://bibliotekanauki.pl/articles/223067.pdf
Data publikacji:: 2010
Wydawca:: Akademia Marynarki Wojennej. Wydział Dowodzenia i Operacji Morskich
Tematy:: okręty szybkie
śruby okrętowe
układy napędowe wielośrubowe
transport
high speed vessels
marine propellers
multi-propeller propulsion systems
Opis:: Jednostki szybkie projektowane są na maksymalne prędkości pływania, natomiast z reguły eksploatowane są prędkościami znacznie mniejszymi, tzw. częściowymi. Wymaga to wyłączenia z pracy poszczególnych silników czy śrub napędowych. Śruby niepracujące są holowane przez kadłub okrętu, pracują w zakresie tzw. pracy turbinowej i przekazują moment obrotowy na wał oraz wytwarzają ujemny napór, czyli powodują dodatkowy opór. Momenty i napory występujące na śrubie w tym zakresie pracy można oszacować w oparciu o uniwersalne charakterystyki hydrodynamiczne śrub. Zaprezentowano metodykę oraz przykład obliczania oporów śrub swobodnie obracających się i zastopowanych dla założonego układu napędowego okrętu.
High speed vessels are designed for maximum speeds, but their factual operation speed parameters are usually considerably lower — partial speed. In such cases particular propulsion propellers and engines need to be shut down. The idle propellers are dragged by the hull and they work in the so-called turbine work mode; they transfer torque to the shaft and generate negative thrust, i.e. additional resistance. To estimate torque and thrust on a propeller in this work mode universal hydrodynamic characteristics of propellers may be used. This paper presents the methodology and an example of calculating resistance of freewheeling and locked propellers for a given marine propulsion system.
Źródło:: Zeszyty Naukowe Akademii Marynarki Wojennej; 2010, R. 51 nr 4 (183), 4 (183); 13-18
0860-889X
Pojawia się w:: Zeszyty Naukowe Akademii Marynarki Wojennej
Dostawca treści:: Biblioteka Nauki

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