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1

Energy analysis of propulsion shaft fatigue process in rotating mechanical system Part I Testing significance of influence of shaft material fatigue excitation parameters

Korczewski Z., Marszałkowski K.

Polish Maritime Research

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2018

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S 1

211--217

EN

The article discusses the problem of mathematical modelling of energy conversion processes in a rotating mechanical system for the purpose of identifying fatigue states of propulsion shafts in this system. A simplified physical model of the analysed system, constructed in an appropriate scale, has made the basis for the experimental research. The research programme took into consideration mechanical fatigue excitation of the model propulsion shaft to find the correlation between the dynamic system load generated by a bending moment and the energy state of a specified shaft segment. A physical model of the analysed process was proposed, for which the plan of static randomised block experiment was worked out. The recorded experimental results were used for statistical analysis of the significance of influence of the quantities exciting the propeller shaft fatigue process and the adequacy of the developed mathematical model describing shaft’s durability. The analysis made use of the F-Snedecor test. The article describes the general concept of the research, the constructed laboratory test rig, and the methodology of statistical inference concerning the significance of influence of input (exciting) parameters of the physical model on the recorded output parameters. The results of the performed statistical tests confirm the absence of the significance of influence of the rotational speed of the propulsion shaft on the selected types of rotating operation of the mechanical system. As a consequence, only one exciting parameter, which is the loading mass, is going to be taken into account in the functional description of fatigue life of the propulsion shaft.

2

Badania efektywności energetycznej nowo produkowanych paliw żeglugowych z zastosowaniem silnika Diesla

Korczewski Z.

Journal of Polish CIMEEAC

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2018

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Vol. 13, no 1

47--57

PL

W artykule przybliżono jedno z zagadnień naukowych rozwiązywanych w ramach projektu badawczego finansowanego przez Wojewódzki Fundusz Ochrony Środowiska i Gospodarki Morskiej w Gdańsku, a mianowicie metodę badań energetycznych silnika o zapłonie samoczynnym w warunkach zasilania niestandardowym (modyfikowanym) paliwem żeglugowym. Zaprezentowano reprezentatywne wyniki testów silnikowych realizowanych na zbudowanym w tym celu stanowisku laboratoryjnym dla wyznaczenia charakterystyk energetycznych jednocylindrowego silnika Diesla w postaci wykresów strumieniowych Sankey’a. Stanowią one efektywne i skuteczne narzędzie weryfikacji różnego rodzaju paliw modyfikowanych wprowadzanych na rynek, zarówno dla ich producentów, jak i armatorów eksploatowanych statków, a także urzędów administracji morskiej oraz inspektoratów ochrony środowiska.

3

A method to assess transverse vibration energy of ship propeller shaft for diagnostic purposes

Korczewski Z.

Polish Maritime Research

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2017

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nr 4

102--107

EN

The article discusses a key problem of ship propulsion system vibration diagnostics, which concerns assessing this part of mechanical energy transmitted from the main engine to the ship propeller which is dissipated due to propeller shaft vibration. A simplified calculation model is proposed which allows the total energy of the generated torsional vibration to be assessed from the shaft deflection amplitude measured at the mind-span point between the supports. To verify the developed model, pilot tests were performed on the laboratory rotational mechanical system test rig. In those tests, cyclic bending moment was applied to a unified (cylindrical) material sample, which modelled, at an appropriate scale, structural and functional properties of a real propeller shaft.

4

Problematyka wyznaczania wartości opałowej modyfikowanych paliw żeglugowych

Korczewski Z.

Journal of Polish CIMEEAC

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2017

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Vol. 12, no 1

31--37

PL

W artykule przedstawiono krótką charakterystykę modyfikowanych paliw żeglugowych wprowadzanych na rynek przez koncerny paliwowe PKN ORLEN S.A., LOTOS Asfalt Sp. z o.o. oraz STENA OIL (Szwecja) oraz ich podstawowe własności fizykochemiczne. Zwrócono szczególną uwagę na odpowiedni dobór lepkości paliwa zasilającego silnik okrętowy, który determinuje właściwy przebieg procesu spalania oraz odpowiednie warunki smarowania par precyzyjnych aparatury wtryskowej. Przybliżono technologię pomiaru ciepła spalania paliw ciekłych w kalorymetrze, wykorzystywaną dodatkowo do wstępnego, jakościowego i ilościowego oszacowania produktów pozostałościowych po spaleniu próbki paliwowej w tyglu bomby kalorymetrycznej, a także problemy badawcze związane z wyznaczaniem wartości opałowej pozostałościowych paliw żeglugowych.

5

Badanie endoskopowe przestrzeni roboczej silnika o zapłonie samoczynnym z wstępną komorą spalania

Korczewski Z.

Journal of Polish CIMEEAC

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2017

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Vol. 12, no 1

39--50

PL

W artykule podjęto zagadnienie diagnostyki endoskopowej przestrzeni roboczych tłokowych silników spalinowych. Scharakteryzowano endoskopową aparaturę diagnostyczną będącą na wyposażeniu bazy laboratoryjnej Katedry Siłowni Morskich i Lądowych Wydziału Oceanotechniki i Okrętownictwa Politechniki Gdańskiej. Przybliżono metodykę realizacji badań endoskopowych na przykładzie laboratoryjnego silnika o zapłonie samoczynnym z wstępną komorą spalania. Miały one na celu ocenę stanu referencyjnego jego przestrzeni roboczej przed rozpoczęciem testowania różnego rodzaju pozostałościowych paliw żeglugowym, w tym zasiarczonych i modyfikowanych. Załączone wyniki badań endoskopowych dotyczą zarówno jakościowej jak i ilościowej oceny wykrytych defektów powierzchniowych elementów ograniczających przestrzeń robocza przedmiotowego silnika.

6

The concept of research on ecological, energy and reliability effects of modified marine fuel oils application to supply compression-ignition engines in real conditions

Korczewski Z., Marszałkowski K., Rudnicki J.

Combustion Engines

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2017

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R. 56, nr 4

56--61

EN

Within the article, basic assumptions of the research project financed by Regional Fund for Environmental Protection and Water in Gdansk were described. The project concerns the experimental investigations carried out on laboratory compression-ignition engine in conditions of its supply with a non-standard marine fuel oil. Configuration and measuring capability of laboratory test bed presently being constructed were introduced. The concept of engine tests implementation as well as a general outline of research methodology was characterised. After being accepted by Polish Committee for Standardization they could become an effective and efficient verification tool for various types of modified fuel oils introduced on the market, both for the maritime administration offices and shipyards as well as ship owners in operation.

7

Laboratory station for research of the innovative dry method of exhaust gas desulfurization for an engine powered with residual fuel

Korczewski Z., Rudnicki J., Zadrąg R.

Combustion Engines

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2017

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R. 56, nr 1

32--37

EN

Development of technology for exhaust gas desulfurization in marine engines using the dry method is, nowadays, a priority due to the calendar of introducing restrictions by the Directive of the European Parliament and of the Council 2012/33/EU of 21 November 2012. According to this directive, starting from 1 January 2015, inside the SECA (Sulphur Emission Control Area) the maximum sulfur content of marine fuels used on territorial seas is 0.1% per weight unit. But at the same time the directive allows for the use of exhaust gas desulfurization plant operating in a closed system. The ship equipped with the system will be able to use fuels with a high sulfur content, which will then be removed from the exhaust gas through an applied adsorber, and the reacted adsorbent is received by specialized services stationed in harbors. The International Maritime Organization has set a limit value of the emissions of sulfur oxides in exhaust gases of marine engines at 6 g/kWh (International Convention for the Prevention of Sea Pollution from Ships MARPOL 73/78 Annex VI, Regulation 14). Contemporary methods of exhaust gas desulfurization in marine engines are all expensive methods (4-5 million euro). This is, among other reasons, due to the limited market audience, but primarily due to the monopolized position of manufacturers offering fabrication and assembly of this type of marine ship installations. Proposed as part of a research project financed by the Regional Fund for Environmental Protection and Maritime Economy in Gdansk, the dry method (adsorption) reducing SOx emissions in exhaust gases of marine engines, is an alternative, and a definitely cheaper and therefore competitive solution, compared to the wet methods (absorption), which are currently the most widely used in marine scrubber installations. Importantly, as confirmed by the results of the study, the proposed dry method, in addition to the effective reduction of sulfur oxides, also reduces emissions of nitrogen oxides and carbon monoxide. The paper presents the configuration and measurement capabilities of the test station built under the project, as well as the representative results of the investigations so far. During the exhaust gas desulfurization test a sodium adsorbent (sodium bicarbonate) and its modifications were used in the process of mechanical, chemical, and thermal activation. Two physicochemical processes were studied during the development of the method: of adsorbent’s reaction on the chemical emission of the exhaust gas – the effectiveness of SOx and NOx compound removal, with various structural solutions in the process reactor, the impact of the adsorber on the emission source of sulfur oxides, that is, on the compression-ignition engine. Therefore, one of the priorities of the project, with a utilitarian significance, was to determine the impact of the inclusion of the desulfurization installation in the exhaust gas system on the energy ratios of the engine.

8

Exhaust gas temperature measurements in diagnostics of turbocharged marine internal combustion engines. Part II Dynamic measurements

Korczewski Z.

Polish Maritime Research

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2016

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nr 1

68--76

EN

The second part of the article describes the technology of marine engine diagnostics making use of dynamic measurements of the exhaust gas temperature. Little-known achievements of Prof. S. Rutkowski of the Naval College in Gdynia (now: Polish Naval Academy) in this area are presented. A novel approach is proposed which consists in the use of the measured exhaust gas temperature dynamics for qualitative and quantitative assessment of the enthalpy flux of successive pressure pulses of the exhaust gas supplying the marine engine turbocompressor. General design assumptions are presented for the measuring and diagnostic system which makes use of a sheathed thermocouple installed in the engine exhaust gas manifold. The corrected thermal inertia of the thermocouple enables to reproduce a real timehistory of exhaust gas temperature changes.

9

Physical model of energy-related processes in a rotating mechanical system for the purposes of diagnosis of the transmission shafts

Korczewski Z., Marszałkowski K.

Journal of Polish CIMEEAC

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2016

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Vol. 11, no 1

69--76

EN

In the present article, selected problems connected with identification of slowly changing energy-related processes accompanying high cyclic fatigue of construction materials of simple mechanical systems, with special consideration of transmission shafts, are mentioned for diagnostic purposes. The article also presents physical models of object and processes that in a simplified way reflect mechanical energy transmission from transmission engine to ship propeller.

10

Directions of the scientific research conducted in the Department of Marine and Power Plants of the Faculty of Ship Technology of the Gdansk University of Technology

Korczewski Z.

Journal of Polish CIMEEAC

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2016

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Vol. 11, no 1

77--86

EN

In this article the short historical outline of the Department of Marine and Land Power Plants of the Faculty of Ocean Engineering and Ship Technology of the Gdansk University of Technology was introduced. Its activity beginnings, in the post-war history of the University, reach 1952. The leading scientific issues, which have been developed for years in three principal directions: design, manufacture and operation of machines and devices installed into marine and land power plants as well as into different type of the offshore power plants. There was given a special focus on the Professors' profiles executing official duties of the Head of the Department (Division) of Marine Power Plants (Marine and Land Power Plants). They were creating its development policy over the last 60 years bringing a substantial contribution towards the present intellectual and laboratory potential, not only to the Department, but also to the Faculty and University.

11

Exhaust gas temperature measurements in diagnostics of turbocharged marine internal combustion engines Part I standard measurements

Korczewski Z.

Polish Maritime Research

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2015

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nr 1

47--54

EN

The article discusses the problem of diagnostic informativeness of exhaust gas temperature measurements in turbocharged marine internal combustion engines. Theoretical principles of the process of exhaust gas flow in turbocharger inlet channels are analysed in its dynamic and energetic aspects. Diagnostic parameters are defined which enable to formulate general evaluation of technical condition of the engine based on standard online measurements of the exhaust gas temperature. A proposal is made to extend the parametric methods of diagnosing workspaces in turbocharged marine engines by analysing time-histories of enthalpy changes of the exhaust gas flowing to the turbocompressor turbine. Such a time-history can be worked out based on dynamic measurements of the exhaust gas temperature, performed using a specially designed sheathed thermocouple. The first part of the article discusses possibilities to perform diagnostic inference about technical condition of a marine engine with pulse turbocharging system based on standard measurements of exhaust gas temperature in characteristic control cross-sections of its thermal and flow system. Selected metrological issues of online exhaust gas temperature measurements in those engines are discusses in detail, with special attention being focused on the observed disturbances and thermodynamic interpretation of the recorded measuring signal. Diagnostic informativeness of the exhaust gas temperature measurements performed in steady-state conditions of engine operation is analysed in the context of possible evaluations of technical condition of the engine workspaces, the injection system, and the fuel delivery process.

12

Analytical method of determining dynamic properties of thermocouples used in measurements of quick – changing temperatures of exhaust gases in marine diesel engines

Korczewski Z., Puzdrowska P.

Combustion Engines

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2015

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R. 54, nr 3

300--306

EN

The article presents selected issues of mathematical modeling of heat exchange between the thermocouple and the exhaust gas flowing them, in unsteady conditions. On the way of energy balancing consideration of thermodynamic processes developed differential equations describing the dynamic properties for three versions of the design sheathed thermocouples: with weld isolated from the sheath, with weld welded the sheath and with the open weld. On this basis were determined the equations describing the time constants. After substituting the appropriate the input data : materials and heat-flow, provided by the manufacturer (the company "Termo-Precyzja") it was possible to compare the numerical values of the time constants of thermocouples and make a rational choice for the diagnostic tests conducted marine diesel engines.

PL

W artykule przedstawiono wybrane zagadnienia modelowania matematycznego wymiany ciepła pomiędzy termoparą i omywających ją spalinami w warunkach nieustalonych. Na drodze bilansowania energii rozpatrywanych procesów termodynamicznych opracowano równania różniczkowe opisujące cechy dynamiczne trzech wersji konstrukcyjnych termopar płaszczowych: ze spoiną izolowaną od płaszcza, ze spoiną zgrzewaną do płaszcza i ze spoiną odkrytą. Na tej podstawie wyznaczono równania opisujące ich stałe czasowe. Po podstawieniu odpowiednich danych wejściowych: materiałowych i cieplno-przepływowych, udostępnionych przez producenta (firma „Termo-Precyzja”) możliwe było porównanie wartości liczbowych stałych czasowych tych termopar i dokonanie racjonalnego doboru dla potrzeb prowadzonych badań diagnostycznych silników okrętowych.

13

Balancing energy processes in turbine engines

Balicki W., Głowacki P., Szczeciński S., Korczewski Z., Kozakiewicz A., Szczeciński J.

Polish Maritime Research

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2014

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nr 4

48--56

EN

The article discusses the issue of balancing energy processes in turbine engines in operation in aeronautic and marine propulsion systems with the aim to analyse and evaluate basic operating parameters. The first part presents the problem of enormous amounts of energy needed for driving fans and compressors of the largest contemporary turbofan engines commonly used in long-distance aviation. The amounts of the transmitted power and the effect of flow parameters and constructional properties of the engines on their performance and real efficiency are evaluated. The second part of the article, devoted to marine applications of turbine engines, presents the energy balance of the kinetic system of torque transmission from main engine turbines to screw propellers in the combined system of COGAG type. The physical model of energy conversion processes executed in this system is presented, along with the physical model of gasodynamic processes taking place in a separate driving turbine of a reversing engine. These models have made the basis for formulating balance equations, which then were used for analysing static and dynamic properties of the analysed type of propulsion, in particular in the aspect of mechanical loss evaluation in its kinematic system.

14

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.

15

Analysing the potential for application of the phase shift method in endoscopic examination of marine engines

Korczewski Z.

Polish Maritime Research

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2013

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nr 1

23--30

EN

The article presents theoretical principles of image processing in digital endoscopy which makes use of a miniaturised spectral scanner “PhaseProbe” designed by General Inspection Technologies LP, the producer of the measuring videoendoscope Everest XLG3. The technology of optoelectronic 3D mapping of the examined surface, which consists in measuring the phase shift between the emitted and reflected light waves, is briefly described. The efficiency of the “PhaseProbe” based method of endoscope measurements is compared with the earlier developed methods, such as “ShadowProbe” and “LaserDots”, which were used by the author in real conditions of diagnostic investigations of engines in operation in marine power plants. The processed results of the endoscope analysis of the broken gas turbine engine rotor blades which were earlier dimensioned using the inspection probes of “StereoProbe”, “ShadowProbe” and “LaserDots” type and now are examined by the author with the aid of the phase shift method make a valuable complement and synthesis of the discussion presented in the article.

16

Use of langmuir probe in diesel engine diagnostic research. Part I measurement technology

Korczewski Z., Rudnicki J., Cenian A., Piechowicz L.

Journal of Polish CIMAC

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2013

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Vol. 8, no 2

41--48

EN

In the paper, the basic assumptions of diesel engine cylinder system's diagnosing method, based on observation of emerging and moving electric charges of ionized gas in the combustion workspaces, using Langmuir's probe. In the first part of the paper, only the technology of the measurement and results of the preliminary diagnostic tests of laboratory engine Farymann Diesel D10 were presented. The primary purpose of the research was confirmation of susceptibility of a control diesel engine to a completely original measurement method that enables a precise determination of the angle of fuel's self-combustion. To verify the diagnostic utility of the obtained measurement data, simultaneously, the measurement of the cylinder pressure and generated vibrations coming from injection system and engine valve train (measured on the cover of the head or its tie bolt) were carried out. The reaserch were financed as a part of a Reaserch Task No 4 "Elaboration of integred technologies of fuel and energy production using biomass, agricultural waste and other" under a strategical programme of scientific research and development works "Advanced technologies of energy production", co-financed by NCBiR and ENERGA S.A. The solution of the measurement of the angle of fuel's self-combustion presented in the article was applied to Polish Patent Office. The application number is P.402669, titled:„Układ monitorowania kąta samozapłonu paliwa, zwłaszcza w cylindrze silnika o zapłonie samoczynnym z zastosowaniem sondy Langmuira”. (The monitoring system of the angle of fuel's self-combustion, in the cylinder of a diesel engine using Lagmuir's probe").

17

“Shadow” vs. “Phase 3D” method within endoscopic examinations of marine engines

Korczewski Z., Rudnicki J.

Combustion Engines

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2013

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R. 52, nr 3

302--307

EN

A visual investigation of surfaces creating internal, working spaces of marine combustion engines by means of specialized view-finders so called endoscopes is at present almost a basic method of technical diagnostics. The surface structure of constructional material is visible during investigations like through the magnifying glass (usually with a precisely determined magnification), which makes possible a detection, recognition and if possible, quantitative evaluation of the failures and material defects appearing, and in result – an opinion of the waste degree and the dirt intensity of studied constructional elements. This is an especially important advantage while the failures do not generate observable values of diagnostic parameters. Endoscopic investigation of the machine being switched off from motion enables evaluation of its construc-tional elements’ waste and dirt almost at once. The paper deals with diagnostic issues concerning endoscopic examinations of the working spaces within marine diesel and gas turbine engines. In the beginning, endoscopy apparatus being on laboratory equipment of the Department of Ship Power Plants of Gdansk University of Technology in Poland has been characterized. The endoscopy considerations have been focused on theoretical bases of a digital image processing and especially - on the “Shadow” and “Phase 3D” measurement method. There has been carried out a comparative analysis of these methods’ efficiency and effectiveness in the real conditions of the diagnostic investigations performance of the engines built in the marine power plant.

PL

Badanie wizualne powierzchni tworzących przestrzenie robocze silników okrętowych z zastosowaniem specjalistycznych wzierników tzw. endoskopów to obecnie niemal podstawowa metoda diagnostyki technicznej. Struktura powierzchniowa materiału konstrukcyjnego widoczna jest podczas badań jak przez lupę, zazwyczaj w pewnym powiększeniu, co umożliwia wykrycie, rozpoznanie i ewentualną ocenę ilościową występujących defektów i wad materiałowych, które zazwyczaj nie generują obserwowalnych zmian wartości parametrów diagnostycznych. W artykule przedstawiono wybrane zagadnienia diagnostyki endoskopowej przestrzeni roboczych okrętowych turbinowych i tłokowych silników spalinowych. Scharakteryzowano endoskopową aparaturę diagnostyczną będącą na wyposażeniu bazy laboratoryjnej Katedry Siłowni Okrętowych Politechniki Gdańskiej. Przybliżono podstawy teoretyczne przetwarzania obrazu w endoskopii cyfrowej, ze szczególnym uwzględnieniem metody pomiarowej „Cienia” i „Fazowej 3D”. Przeprowadzono analizę porównawczą efektywności i skuteczności zastosowania każdej z metod w rzeczywistych warunkach realizacji badań diagnostycznych silników zabudowanych w siłowni okrętowej.

18

Investigations of a D10 laboratory Farymann Diesel engine by means of a Langmuir probe

Korczewski Z., Rudnicki J., Piechowski L., Cenian A.

Combustion Engines

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2013

|

R. 52, nr 2

75--82

EN

A precise determination of the crankshaft angular position, at which the self fuel ignition occurs in a diesel engine, enables a credible diagnosis of the technical condition of the engine working space as well as the fuel feed system. An observation of the Langmuir probe signal provides entirely new possibilities for engine diagnostics. The probe is introduced into the working space of a cylinder through its indicator valve. This paper presents preliminary results of diagnostic tests performed on a D10 type Farymann Diesel engine. The main aim of the investigations was to confirm the diesel engine control susceptibility to the applied, original measuring method that enables a precise determination of the crank-shaft angle, under which the fuel self-ignition occurs. In order to verify the diagnostic results, simultaneous measurements have been conducted of the cylinder pressure as well as vibrations (measured on the cylinder head cover or its mounting bolts) generated by the engine fuel injection system and the valve timing system. A satisfactory qualitative and quantitative agreement of the recorded control parameters has been obtained using a simplified comparative analysis. The results showed that further upgrade of the diagnostic method as well as the computer software is necessary in order to synchronize all the monitored variables and enable a comparative analysis in relation to the angular crankshaft position.

PL

Precyzyjne wyznaczenie położenia kątowego wału korbowego, przy którym następuje samozapłon paliwa silnika o ZS to podstawowy warunek sformułowania wiarygodnej diagnozy o stanie technicznym jego przestrzeni roboczych oraz układu zasilania paliwem. Całkowicie nowe możliwości w tym względzie wnosi obserwacja sygnału sondy Langmuira, którą wprowadza się do przestrzeni roboczej cylindra przez zawór indykatorowy. W niniejszym artykule zaprezentowano wstępne wyniki badań diagnostycznych silnika laboratoryjnego Farymann Diesel D10 z zastosowaniem tej metody. Podstawowym celem badań było potwierdzenie podatności kontrolnej silnika o ZS na zastosowanie całkowicie oryginalnej metody pomiarowej, która umożliwia precyzyjne wyznaczenie kąta samozapłonu paliwa. Dla weryfikacji informacyjności diagnostycznej uzyskanych wyników pomiarowych przeprowadzono jednoczesne pomiary ciśnienia cylindrowego oraz drgań generowanych z układu wtryskowego i rozrządu zaworowego silnika (mierzonych na pokrywie głowicy lub jej śrubach ściągowych). W wyniku uproszczonej analizy porównawczej uzyskano zadowalającą zgodność jakościową i ilościową zarejestrowanych przebiegów obserwowanych parametrów kontrolnych. Uzyskane doświadczenia badawcze wskazują na konieczność dalszej modernizacji metody pomiarowej oraz oprogramowania komputerowego, tak aby możliwe było precyzyjne zsynchronizowanie rejestracji wszystkich wielkości pomiarowych, umożliwiające dokonanie analizy porównawczej ich przebiegów względem położenia kątowego wału korbowego.

19

Diagnostic testing of marine propulsion systems with internal combustion engines by means of vibration measurement and results analysis

Rudnicki J, Korczewski Z.

Combustion Engines

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2013

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R. 52, nr 3

308--313

EN

In this paper selected issues concerning vibration diagnosis of the mechanical system within marine propulsion units have been presented, carried out on the basis of experimental examinations of a real object in which an exceedance of the allowable vibration’s level had been observed. Used diagnosing system has been characterised. A procedure of longitudinal and transverse vibrations shaft lines of the mechanical system within marine propusion measurement was presented, with use of portable vibration computerized data logger as well as on the method of vibrations spectral-correlation analysis as a basis of diagnostic process considering dynamic state of analyzed system. Analyzis that has been carried out enabled the selection of the most probable causes for the loss of mechanical system stability. The relevance of the diagnosis was confirmed by the workshop measurements of the torque transmission elements as well as visual inspection of the propellers while the ship was put on a dock.

PL

W referacie przedstawiono wybrane zagadnienia diagnostyki drganiowej okrętowego zespołu napędowego, na przykładzie eksploatacyjnych badań obiektu rzeczywistego, na którym zaobserwowano zwiększony poziom drgań. Scharakteryzowano zastosowany system diagnozujący. Zaprezentowano procedurę pomiaru drgań wzdłużnych i poprzecznych linii walów okrętowego układu napędowego, z zastosowaniem przenośnego rejestratora drgań oraz metodykę ich analizy widmowo-korelacyjnej, jako podstawę wnioskowania diagnostycznego o stanie dynamicznym rozpatrywanego układu. Przeprowadzona analiza pozwoliła na wskazanie najbardziej prawdopodobnych przyczyn utraty stabilności układu mechanicznego. Trafność postawionej diagnozy potwierdziła weryfikacja warsztatowa elementów transmisji momentu obrotowego oraz oględziny śrub napędowych podczas postoju okrętu w doku.

20

The sources of contamination and reasons for damage of the flow part of the marine turbine engine in operation

Korczewski Z.

Silniki Spalinowe

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2012

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R. 51, nr 4

9-19

EN

The aim of this paper is to show particular sensitivity of the flow part of the marine turbine engine to the presence of contaminants in the intake air. The contaminants form hard-to-remove deposits in the intervane channels that result in a reduced efficiency and performance of the engine. The paper classifies the contaminants according to the source of their formation and their destructive force. The performed analyses and syntheses of the discussed problem have been complemented with the results of own endoscopic research of the flow part of various types of marine turbine engines.

PL

Celem niniejszego artykułu jest wykazanie szczególnej wrażliwości części przepływowej turbinowego silnika spalinowego zabudowanego w siłowni okrętowej na obecność zanieczyszczeń zawartych w powietrzu dolotowym. Tworzą one w kanałach międzyłopatkowych sprężarek i turbin trudno usuwalne osady, które zmniejszają sprawność i osiągi silnika. W artykule sklasyfikowano występujące zanieczyszczenia według źródła powstawania i według charakteru destrukcyjnego oddziaływania na część przepływową. Przeprowadzone analizy i syntezy rozpatrywanego problemu eksploatacyjnego uzupełniono wynikami własnych badań endoskopowych części przepływowej różnych typów turbinowych silników okrętowych.