Wyniki wyszukiwania - BazTech

1

The development of long-range heat transfer surfaces for marine diesel engine charge air coolers

Kuznetsov Valerii, Gogorenko Oleksiy, Kuznetsova Svetlana

Zeszyty Naukowe Akademii Morskiej w Szczecinie

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2021

|

nr 65 (137)

51--57

EN

Charge air cooling is essential for the efficient operation of marine diesel engines. This work presents the results of research on the characteristics of long-range heat transfer surfaces for marine diesel engines. Elliptical and flat-oval tubes were considered. This study was carried out using mathematical models that consisted of the equations for energy conservation, motion, continuity, and state. The RSM turbulence model was used to close the system of equations. To solve the resulting system of equations, the RANS approach was used, which was implemented in the software package Code Saturne with a free license and the SimScale cloud service. The mathematical model was verified by comparing the model results with the experimental results obtained using a prototype heat-exchange surface of a charge air cooler at a test bench. The discrepancy between the theoretical and experimental heat transfer coefficient α was ≤ 8.3%. An estimate of the compactness of smooth elliptical and flat-oval tube banks compared with round ones was carried out. A 19.6% increase in compactness was obtained for elliptical tubes and 17.5% for flat-oval tubes. Based on the profiled finning surfaces, it is possible to improve their thermohydraulic characteristics by up to 40% when using them together with elliptical tubes compared with round ones and up to 26% when using them with flat-oval tubes.

2

Plasma technology to remove NOx from off-gases

Pawelec Andrzej, Chmielewski Andrzej G., Sun Yongxia, Bułka Sylwester, Torims Toms, Pikurs Guntis, Mattausch Gösta

Nukleonika

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2021

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Vol. 66, No. 4

227--231

EN

Operation of marine diesel engines causes signifi cant emission of sulphur and nitrogen oxides. It was noticed worldwide and the regulations concerning harmful emissions were introduced. There were several solutions elaborated; however, emission control for both SOx and NOx requires two distinctive processes realized in separated devices, which is problematic due to limited space on ship board and high overall costs. Therefore, the electron beam flue gas treatment (EBFGT) process was adopted to ensure the abatement of the problem of marine diesel off-gases. This novel solution combines two main processes: fi rst the fl ue gas is irradiated with electron beam where NO and SO2 are oxidized; the second stage is wet scrubbing to remove both pollutants with high efficiency. Laboratory tests showed that this process could be effectively applied to remove SO2 and NOx from diesel engine off-gases. Different compositions of absorbing solution with three different oxidants (NaClO, NaClO2 and NaClO3) were tested. The highest NOx removal efficiency (>96%) was obtained when seawater-NaClO2-NaOH was used as scrubber solution at 10.9 kGy dose. The process was further tested in real maritime conditions at Riga shipyard, Latvia. More than 45% NOx was removed at a 5.5 kGy dose, corresponding to 4800 Nm3 /h off-gases arising from ship emission. The operation of the plant was the first case of examination of the hybrid electron beam technology in real conditions. Taking into account the experiment conditions, good agreement was obtained with laboratory tests. The results obtained in Riga shipyard provided valuable information for the application of this technology for control of large cargo ship emission.

3

Particulate matter emission reduction from marine diesel engines by electrohydrodynamic methods

Sobczyk Arkadiusz T., Jaworek Anatol, Marchewicz Artur, Krupa Andrzej, Czech Tadeusz, Śliwiński Łukasz, Charchalis Adam

Journal of KONES

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2019

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Vol. 26, No. 3

203--210

EN

Particulate matter (PM) and gaseous compounds (SO2, NOx, VOC) emitted by diesel engines causes serious global environmental problems and health impact. Despite numerous evidences about the harmfulness of diesel particles, the PM emission by diesel engines used by ships, cars, agricultural machines, or power generators is still unregulated, and the efficient removal of PM from diesel exhausts is still the major technological challenge. In order to comply with the International Maritime Organization regulation, the NOx emission is reduced by using selected catalytic reactor, and sulphur oxide emission has been reduced by using fuels of low sulphur content. However, both of those measures cannot be used for the reduction of PM emission produced during combustion of marine fuels. The lack of appropriate regulations results from insufficiently developed technology, which could remove those particles from exhaust gases. Conventional scrubbers currently available on the market remove only sulphur oxide with required collection efficiency, but the collection efficiency for PM2.5 is below 50%. The article discusses the technical means used for the removal of PM from marine diesel engines via applying electrohydrodynamic methods, in particular electrostatic agglomeration, as a method of nanoparticles coagulation to larger agglomerates, which could operate in two-stage electrostatic precipitation systems, and electrostatic scrubbers, which remove particles by electrically charged water droplets. The experimental results were obtained for a 2-stroke 73 kW diesel engine fuelled with marine gas oil (MGO). The agglomerator allowed increasing the collection efficiency from diesel exhausts for PM2.5 particles by about 12%, compared to electrostatic precipitator operating without agglomerator, and the total mass collection efficiency was above 74%. The collection efficiency of electrostatic scrubber was higher than 95wt.%. The advantage of using the electrostatic scrubber is that it can also reduce the SO2 emission by more than 90%, when HFO is used.

4

Method of evaluation of the technical condition of the diesel-electric unit

Zacharewicz Marcin, Kniaziewicz Tomasz

Diagnostyka

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2019

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Vol. 20, No. 2

113--119

EN

The article presents an innovative method of evaluating technical condition of marine diesel engines driving electric power generator. The presented method is based on measurements of the phase-to-phase voltage of the synchronous generator and on measurements of the acceleration of the injector needle. The basis for the method is an assumption that the shapes of the waveforms of the phase-to-phase voltage of the generator include information on fluctuations of the angular velocity of the engine crankshaft. Consequently, these fluctuations depend directly on the course of the working process occurring in the engine cylinders. The vibrating signal is used to synchronize the shapes of the voltage waveforms with the engine working process.

PL

W artykule przedstawiono nowatorską metodę oceny stanu technicznego okrętowych tłokowych silników spalinowych o zapłonie samoczynnym napędzających prądnice. Prezentowana metoda bazuje na pomiarach napięcia międzyfazowego prądnicy synchronicznej oraz na pomiarze przyspieszeń iglicy wtryskiwacza. Podstawą metody jest założenie, że przebiegi napięcia międzyfazowego prądnicy zawierają informację o fluktuacjach prędkości kątowej wału korbowego silnika. Natomiast fluktuacje te zależą bezpośrednio od przebiegu procesu roboczego realizowanego w cylindrach silnika. Sygnał drganiowy wykorzystywany jest do synchronizacji przebiegów napięcia z cyklem roboczym silnika.

5

Changes in marine diesel engines operating strategy

Lus T.

New Trends in Production Engineering

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2018

|

Vol. 1, Iss. 1

739-746

EN

Constant changes in the operating strategy of marine diesel engines are observed. They refer to whole engine and different functional systems of the engine in different range. The paper presents changes in marine diesel engines operating strategy. Gradual transition from simple failure response operating strategy - Corrective Maintenance (CM) to a reliability-oriented strategy - Reliability Centered Maintenance (RCM) has been described together with some remarks about Planed Maintenance (PM) systems and Condition Based Maintenance (CBM) systems with their latest form called CBM+. Some information about changes in diesel engines operating strategy in the Polish Navy (PN) at the turn of the last 35 years is also presented. An attempt to build engine analyzer for high-speed diesel engines at the Polish Naval Academy (PNA) in order to improve submarine diesel engines operating strategy is also described in the paper.

6

Badanie zużycia wybranych elementów okrętowych średnioobrotowych silników o zapłonie samoczynnym zasilanych paliwami pozostałościowymi

Monieta J.

Tribologia

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2014

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nr 2

111--121

PL

W pracy przedstawiono wyniki badań wybranego obiektu, elementów i węzłów tribologicznych w aspekcie procesów zużycia. Obiektami badań były średnio-obrotowe silniki produkowane na licencji firmy Sulzer. Wśród badanych typów silników ten zasilany paliwami pozostałościowymi podlegał intensywnemu zużyciu. Paliwa te zawierają znaczne ilości siarki, wody oraz odznaczają się dużą liczbą Conradsona. Badania zużycia prowadzono w naturalnych warunkach eksploatacji. Opisano także warunki, w których eksploatowane były badane silniki, gdzie występowały często niesprzyjające warunki tropikalne. Stwierdzono istotne zużycie czopów wału korbowego, tulei cylindrowych, tłoków i głowic. Intensywne zużycie wynika z konstrukcji silnika, w którym system smarowania tłoków i tulei oraz łożysk wału korbowego nie jest rozdzielony. Badania zużycia prowadzono głównie z zastosowaniem biernej obserwacji, pomiarów geometrycznych, analizy obrazów oraz z zastosowaniem biernych i bierno-czynnych eksperymentów diagnostycznych. Problemem w badanych silnikach oprócz intensywnego zużycia materiałów metalowych było tworzenie się osadów. Celem badań była również identyfikacja rodzajów zużycia.

EN

The paper presents the results of the selected object, the elements and of tribological systems in the aspect of wear processes. The objects of research were medium speed engines produced under license from Sulzer. Among the tested objects were the types of engines powered by residual fuels subject to intensive wear. These fuels contain significant amounts of sulphur and water and have a large number of Conradson carbon residue. The wear investigations were performed under natural conditions. The paper also describes the conditions under which the test engines operate, which are often unfavourable tropical conditions. A significant wear of crank pins, cylinder liners, pistons, and cylinder heads were indicated. Intensive wear results from engine design, in which the lubrication system of pistons and sleeves and bearings of the crankshaft is the same. The wear investigations were carried out by applying passive observation, geometrical measurements, and analysis of images, and with applying passive and passive-active diagnostic experiments. The inspected engines showed intensive wear of metal materials and the formation of deposits. An identification of types of the wear was also a purpose of the research.

7

Exhaust temperature measurements of the marine turbocharged diesel engines in operation

Korczewski Z.

Journal of Polish CIMAC

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2014

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Vol. 9, no 2

127--136

EN

he article presents the selected metrology issues concerning the exhaust temperature of the turbocharged marine engines during operation. The special concern has been paid on existing disturbances as well as thermodynamical interpretation of the recorded measurement signal. A diagnostic informativeness of the standard exhaust temperature’s measurements has worked out while the engine runs in steady states has been also considered about many aspects of technical state evaluation of its working spaces, the fuel injection unit as well as the load exchange system.

8

Simulation of the combustion process in the electronically controlled marine diesel engine

Kluj S.

Journal of KONES

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2014

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Vol. 21, No. 4

233--238

EN

The introduction of the electronically controlled low-speed diesel engines has raised a number of new problems - caused mainly by the influence of these electronic system settings on the combustion process. The wide set of the combustion press settings is now available for the chief engineers on the board of the ship and for the shipyard experts during the sea trials. This opens many new possibilities for the combustion process optimization but also causes the danger of the serious engine malfunction due to the improper settings. The paper presents the mathematical model of the electronically controlled low-speed marine diesel engine ant the special attention is paid to the available settings of the combustion process. The effective compression ratio, the injection timing and the exhaust valve setting can be adjusted in a similar manner like in the actual engine. The combustion pressure curves, the mean indicated pressure, the exhaust gas temperature can be observed when changing the combustion settings. The paper describes in detail the results of the several most typical simulations like change of the given combustion pressure increase, the change of the effective compression ratio, the change of the exhaust valve opening timing and the change of the maximum load setting.

9

Technical evaluation of marine auxiliary diesel engine on the basis of parameters synchronous generator

Cwalina A., Kniaziewicz T., Rudnicki J., Zacharewicz M.

Combustion Engines

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2013

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R. 52, nr 3

222--225

EN

The article presents a method for evaluating the technical condition of selected structural elements of the reciprocating internal combustion engine driving a synchronous generator. Th results of measurements of the electric generator parameters are the diagnostic information source. On this basis it is possible to determine the instantaneous angular speed marine engine crankshaft which, in turn, is the basis for reasoning about the correctness of the process of fuel combustion in the engine cylinders, and efficiency of the speed controller. By that means one can define the technical condition of the fuel equipment, sealing the piston-rings-cylinder system, and the correctness of the process of the working medium exchange in the engine cylinders.

PL

W artykule przedstawiono metodę oceny stanu technicznego wytypowanych elementów struktury konstrukcyjnej pomocniczego tłokowego silnika spalinowego napędzającego prądnicę synchroniczną. Źródłem informacji diagnostycznej są wyniki pomiarów parametrów elektrycznych prądnicy. Na ich podstawie możliwe jest określenie chwilowych prędkości kątowych wału korbowego silnika okrętowego, co stanowi podstawę do wnioskowania o prawidłowości przebiegu procesu spalania paliwa w cylindrach silnika oraz o oprawności pracy regulatora prędkości obrotowej. Pozwala to na określenie stanu technicznego aparatury paliwowej, szczelności zespołu tłok-pierścienie-cylinder oraz poprawności przebiegu procesu wymiany czynnika roboczego w cylindrach silnika.

10

The use of expert system for marine diesel engine diagnosis

Charchalis A., Pawletko R.

Zeszyty Naukowe Akademii Marynarki Wojennej

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2012

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R. 53 nr 1 (188)

49-56

EN

The paper presents a diagnostic system for marine diesel engine based on an expert system model. The research relevant to knowledge acquisition for this system was done, knowledge data set was built and general structures of the expert system was proposed. Basic sources of knowledge which can be used for construction of knowledge data set are also identified. The basic knowledge related to the diesel diagnostic was undertaken from experts and diagnostic data base. The paper questionnaire was used to the knowledge acquisition from experts. The basic knowledge related to the marine diesel exploitation was undertaken. The rule induction algorithms was used to knowledge acquisition from data base. During the experiment efficiency of LEM induction algorithms was compared to new MODLEM and EXPLORE algorithms. Training and test data were acquired from experiment on marine engine Sulzer 3AL 25/30.

PL

Artykuł przedstawia system diagnostyczny okrętowego silnika wysokoprężnego oparty na modelu systemu eksperckiego. Przeprowadzono badania odpowiednia dla pozyskania informacji o tym systemie, stworzono zestaw danych oraz zaproponowano struktury ogólne systemu eksperckiego. Zidentyfikowano również podstawowe źródła informacji, które mogą być wykorzystane do budowy zestawu danych wiedzy. Podstawowa wiedza odnosząca się do diagnostyki silników wysokoprężnych została wzięta z eksperckich i diagnostycznych baz danych. Wykorzystano kwestionariusz papierowy w celu uzyskania wiedzy od ekspertów. Uzyskano podstawowe informacje odnoszącą się do eksploatacji silników okrętowych. Zastosowano algorytmy rule induction do uzyskania informacji z bazy danych. Podczas eksperymentu sprawność algorytmów induction LEM została porównana z nowymi algorytmami MODLEM i EXPLORE. Dane szkoleniowe i testowe zostały uzyskane z eksperymentu na silniku okrętowym Sulzer 3AL 25/30.

11

Badanie siły tarcia iglicy w korpusie rozpylacza wtryskiwaczy silników okrętowych przy obecności środków smarujących z uwzględnieniem zmian położenia

Monieta J.

Tribologia

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2012

|

nr 2

41-57

PL

W artykule przedstawiono wyniki badań siły tarcia między iglicą a korpusem rozpylaczy silników okrętowych. Badano wykonane ze stali stopowej rozpylacze tłokowych silników spalinowych zasilanych olejem napędowym lub paliwem pozostałościowym. Do badań wybrano rozpylacze spośród eksploatowanych w naturalnych warunkach, w których stwierdzono stan niezdatności lub wymieniono je profilaktycznie. Badano rozpylacze przy obecności paliwa lub oleju o zbliżonych własnościach, jak również wykonano pomiary czasów wysuwania się iglic z korpusów rozpylaczy dla stopniowanych ich położeń w płaszczyznach względem osi podłużnej w korpusie rozpylacza. Wykonano pomiary geometryczne par precyzyjnych i badano wpływ wymiarów oraz błędów kształtu i położenia części prowadzących na wartości sił tarcia. Badano wpływ położenia kątowego iglicy względem korpusu rozpylacza i mierzono również luz średnicowy między korpusem a iglicą rozpylacza oraz badano jego wpływ na wartość maksymalnej siły tarcia. Badania siły tarcia przeprowadzono na dwóch stanowiskach, w zależności od jej wartości. Pierwsze z nich wykonane było we własnym zakresie do wyznaczania maksymalnej siły tarcia z wykorzystaniem obciążania siłami ciężkości, a drugie stanowisko przeznaczone było do badań wytrzymałości próbek na rozciąganie. Na wartość maksymalnej siły tarcia między korpusem i iglicą rozpylacza ma wpływ stan współpracujących powierzchni oraz ich wzajemne usytuowanie, zanieczyszczenia itp. Przeprowadzone badania miały na celu wyznaczenie składowej siły tarcia i/lub czasu wysuwania się iglicy w zależności od kąta obrotu iglicy w korpusie rozpylacza, od luzu, rodzaju zastosowanych środków smarowych oraz masy iglicy.

EN

This article presents the results of the friction force between the needle and the nozzle body of marine diesel engines. Injectors made of the alloy steel of piston internal combustion engines fed with diesel oil or residual fuel were investigated. Injector nozzles from among the jets operated in natural conditions in which was found the state of unfitness or replaced preventively are investigated. Nozzles were tested in the presence of fuel oil or oil with similar properties, as well as measurements of ejection time choking the nozzle at different angles of the rotation respect to the longitudinal axis of the nozzle needle in the body. Geometrical measurements were made of precision pairs to investigate the effect of the dimensions and shape and location errors on the values of friction forces. The influence of the angular position of the needle tip relative to the body are investigated, and precise measurements of the diameter clearance between the frictional couple were taken to study its effect on the value of the maximum friction force. The research of the frictional forces was carried at two test stands, depending on its value. The first test stand was designed by the author for appointing the maximum using gravitational loading, and the second stand was intended to research the durability of samples to stretching. The value of the maximum force of friction between the body and the needle tip is influenced by the condition of mating surfaces and their mutual positioning, pollution, etc. The research aimed to determine the component of friction force and/or the time of the withdraw of the needle depending on the angle of the turnover of the needle in the nozzle body, clearance, kind, applied medium and masses of the needle.

12

TURBO DIESEL 5 - The new simulator for maritime engineering training

Kluj S.

Journal of Polish CIMAC

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2012

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Vol. 7, no 2

79-86

EN

The specialized diesel engine simulator named Turbo Diesel 5 is the subject of this paper. The mathematical model simulates an engine operation under various conditions and introduces various defects. This model has been implemented in a software, which is used for teaching of the relation between the diesel engine technical state and its operating parameters. The software can be also used for the maintenance strategy teaching. The most popular marine diesel engine faults like a faulty fuel injector, a leaky cylinder, a worn fuel pump, the broken piston rings, a dirty turbocharger, a dirty air filter, a dirty air cooler (and many others) were simulated. Each fault can be simulated in the certain range which can be observed in the practical operation of marine diesel engines. Not only faults, but also the improper adjustment of the fuel injection advance angle were simulated. First the single faults were simulated and their influence on the NOx emission was analyzed. The simulation research has shown that the interaction of several typical engine faults can cause the NOx emission far above the emission limit defined by IMO MARPOL convention. It has been also observed that the simulation of multiple mixed faults gives in many cases the different results that the simple multiplication of the single faults simulation.

13

The importance of measuring mass intensity of flow air through the compressor in diagnostics the turbocharger system marine engine

Witkowski K.

Journal of Polish CIMAC

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2012

|

Vol. 7, no 2

249-254

EN

The paper presents an analysis of the possibility of diagnosing the elements of turbocharger system marine diesel engine. Meaning of diagnostics of this system has also been discussed pointing out the most important consequences resulting from deterioration of supercharger system activity. Work evaluation of supercharger system is usually carried out on the basis of the following parameters: temperature and pressure of supercharging air in the scavenging air receiver (td , pd), pressure drop in air filter and air cooler (pf , pch), temperature exhaust gases before and after the turbine (twyl 1 , twyl 2), temperature of overboard water before and after the air cooler (tch 1 i tch 2), turbocharger rotational speed (nTS ), pressure drop on the exhaust gas boiler (pku) – counterpressure of exhaust. In exploitation practice of turbocharger system diagnostic, mass intensity of flow air through the turbocharger is not used and unfortunately measurement of this size is not realized. But in compressor diagnostics however, it is the basic exit parameter and the enter one for the rest of the elements. Based on research results demonstrated the possibility to use to calculation the mass intensity of flow air through the compressor, measurement pressure drop on the confusor of the compressor. This calculation should be widely used in exploitation practice. This method is easy enough and sufficiently precise, in order to be used in the diagnostics the marine diesel engines.

14

Influence of the cruising speed of a ship on exhaust gas boiler efficacy

Krzyżanowski J.

Journal of Polish CIMAC

|

2012

|

Vol. 7, no 1

133-140

EN

The paper presents simulation calculations for a ship’s power transmission system and the associated exhaust gas boiler with the aim of assessing the boiler’s efficacy. Increasing prices of marine fuels force ship owners to limit the cruising speed of ships. This has negative impact on the operation of an exhaust gas boiler powered with exhaust fumes from the main engine. The boiler’s capacity decreases, seriously limiting the tasks ascribed to vapour. Simulation calculations were conducted for the most typical system used on sea ships, i.e. a multi-turn engine and the associated exhaust gas boiler which generates saturated vapour. Adopting several values of ship cruising speed, which were smaller than the nominal speed, was a starting point for he calculations. Main engine powers were calculated with partial loads. Next, relevant values of excess air number were assigned to those powers and classic combustion calculations were conducted with the use of stochiometric combustion equations. For assumed fumes temperatures in front of and behind the boiler drops in fumes enthalpy were noted. It enabled to calculate the values of heat fluxes released by the fumes in the boiler. After adopting relevant vapour parameters boiler capacities were evaluated as appropriate. Results of those calculations are shown in tables and on the graphs. The summary of the paper includes conclusions and suggestions which may be helpful as far as designing waste heat recovery systems is concerned.

15

Badania wstępne stanu technicznego niedoładowanego silnika okrętowego na podstawie pomiarów parametrów procesów gazodynamicznych spalin w kanale wylotowym

Zacharewicz M.

Zeszyty Naukowe Akademii Marynarki Wojennej

|

2011

|

R. 52 nr 4 (187)

125-132

PL

W artykule przedstawiony jest opis silnika pomocniczego LEYLAND typu SW400 zainstalowanego na stanowisku laboratoryjnym w Akademii Marynarki Wojennej. Dokonano analizy możliwości realizacji pomiarów parametrów gazodynamicznych w kanale spalin wylotowych, przedstawiono możliwości systemu pomiaru i rejestracji parametrów szybkozmiennych MA2005 oraz sposób jego wykorzystania w ocenie stanu technicznego przestrzeni roboczych silnika. Dalszą część artykułu stanowią wyniki badań wstępnych prowadzonych na silnikach typu SW400.

EN

The paper presents a description of auxiliary engines SW400 installed in the laboratory of Polish Naval Academy, an analysis of possibility to measure gas dynamical parameters of an exhaust in a discharge channel, capabilities of the system to measure and register fast changing parameters MA2005 and the way to use the system to estimate the technical condition of engine working spaces area. It also includes the results of preliminary investigations carried out on engine SW400.

16

Baza danych o wybranych okrętowych tłokowych silnikach spalinowych dla potrzeb diagnostyki

Monieta J., Klimontowicz R.

Silniki Spalinowe

|

2011

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R. 50, nr 3

PL

W pracy przedstawiono opracowaną elektroniczną bazę danych o wybranych okrętowych tłokowych silnikach spalinowych dla potrzeb diagnostyki. Baza danych została wykonana dla jednostek pływających największego krajowego armatora. Służy ona do porównania mierzonych parametrów diagnozowanych silników w warunkach eksploatacji z parametrami odniesienia. Stan odniesienia to stan silnika zdatnego, który był po jego wytworzeniu, potwierdzony w czasie prób odbiorczych. Aby można było racjonalnie wykorzystać potrzebne dane, zgromadzono je i skatalogowano, co pozwoliło na proste wyszukiwanie. W tym celu sporządzono bazę danych w oparciu o program, wchodzący w skład pakietu biurowego Microsoft Office. W bazie danych rozwiązano wyszukiwanie danych według rodzaju statku. W polach wyświetlanych znajdują się takie opisy jak: rok i miejsce budowy, parametry statku, bandera itp. Dla każdego statku opracowano formularze silniki główne i pomocnicze, które pozwolą na łatwe i szybkie sprawdzenie potrzebnych parametrów podczas eksploatacji danego silnika. Baza zawiera wybrane parametry silników napędu głównego i pomocniczych oraz charakterystyki wzorcowe, które ułatwią ustalenie diagnozy, prognozy i genezy.

EN

The paper has developed the elaborated an electronic database of selected marine piston combustion engines for diagnostic. The database was constructed for the largest crafttion of the national shipowners. It serves to relate the measured parameters of a target engine operating conditions for the reference parameters. State of reference is a state capable engine, which was after its production, confirmed at the time of acceptance tests. To be able to reasonably use the most needed data, collected and cataloged them, allowing the simple search. For this purpose, drawn up a database based on the program, part of the Microsoft Office suite. The database search resolved data by type of vessel. The fields displayed include such names as year and place of construction, the parameters of the ship, flag, etc. For each vessel forms were developed main and auxiliary engines, which allow for easy and quick check of the necessary parameters during operation of the engine. The database contains some parameters of the main propulsion engines and auxiliary and characterization of reference to help determine the diagnosis, prognosis and genesis.

17

The possibilities of diagnosing common-rail injection systems of marine diesel engines

Beiger A.

Journal of Polish CIMAC

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2011

|

Vol. 6, no 2

15-22

EN

This article presents the application of acoustic stress wave emission for diagnosing Common-Rail injection systems of engines. Failures typical to such systems, as well as problems connected with faulty operation of injectors, have been presented. One of the methods of acoustic emission signal analysis has been discussed. It enables a non-invasive way of diagnosing the injection system of an engine with self-ignition and the Common-Rail system.

18

Evaluation of working spaces'technical condition of marine diesel engine on the basis of operation research

Korczewski Z., Zacharewicz M.

Journal of Polish CIMAC

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2010

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Vol. 5, no 1

85-94

EN

The paper presents the method of evaluation of the technical state of working spaces of a marine diesel engine at the reduced control susceptibility. The method foresees making diagnosis on the basis of the measurements of exhaust gas pressure in the channels connecting engine cylinders with turbocharger’s turbine. In the beginning of the article the research objects are characterized i.e. ZVIEZDA main engine of M401 type and the auxiliary engine DETROIT DIESEL of DDA149TI type. Then, there has been defined a diagnostic measure used to identify the condition of the considered engines. Moreover, there have been presented the selected results of diagnostic tests carried out on the engines being in current operation on warships in the Polish Navy.

19

Research on purification of the marine engine oil with chemical interaction preparation

Młynarczak A.

Journal of KONES

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2010

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Vol. 17, No. 2

341-349

EN

Owing to additives, the lubricating oils are characterized by constantly improving properties. Nevertheless, in extreme hard working conditions of the tribological systems (high pressures, velocities and temperatures, temporary lubricating lack during starting) the machine elements are not secured enough. In connection with the above mentioned the idea to introduce the additional substance - operating preparation into tribological systems (with the lubricating oils) was put forward. Now the chemical interaction preparations have the widest application. These preparations are characterized by big molecular weight and high thermal and chemical stability. Besides filtering, lubricating oils used in marine engines are purified. In connection with it the question arises if the operating preparations (which have higher density then oils and water) are able to join permanently with lubricating oil in order not to separate in the purifying process and what influence they have on lubricating oil ability to separate the water. The lubricating oil with operating preparation MOTOR LIFE PROFFESIONAL and water purifying research were presented in the article so as to answer the above questions. The test stand consisted of two WESTFALIA purifiers. One of these purifiers was working in UNITROL, the other in SECUTROL system. In the research the UNITROL system purifier was used. The research object was MARINOL RG 1240 lubricating oil used in marine diesel engines.

20

Problems of determining mean indicator pressure of piston combustion engines from developed indicator diagrams

Monieta J.

Journal of KONES

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2010

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Vol. 17, No. 3

301-306

EN

The paper presents methods for processing and analysis of in-cylinder pressure course in the combustion chamber of marine engines. In literature are described determinate methods ofmean indicator pressure from closed diagrams, with are but rarely recorded than developed diagrams. There have been showed on limitations occurrence at measurements fast-changed pressures of marine diesel engines in operating conditions and measuring errors the attendants. Mean indicated pressure determined from the indicated timing or angular pressure courses in the cylinders is still a reliable diagnostic symptom. The paper presents too the results of experimental measurement of in-cylinder pressure signals, medium speed marine engines with application resistive sensor and using the photo-optical sensor of crankshaft position, and without the marker position of the crankshaft. Not always possible to altach the marker for the position of the crankshaft, and even there is no way of stopping the engine when you need to diagnose it. The top dead centre of the piston can be determined then analytically. The work developed a method of determining the mean indicated pressure of the developed indicator diagrams. Based on calculations ofmean indicator pressure made many of diagnosis of the medium speed marine diesel engines in the operating conditions.