Dominika Cuper Przybylska - Academia.edu (original) (raw)
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Papers by Dominika Cuper Przybylska
Polish Maritime Research, Dec 1, 2021
This study compares the performance of a plain bearing, with a similar structure to a tail shaft ... more This study compares the performance of a plain bearing, with a similar structure to a tail shaft stern bearing, lubricated with either mineral oil or an environmentally acceptable lubricant (EAL). The main characteristic of the bearing is its length/diameter ratio of <1. Measurements are carried out with the bearing operating under loads from 0.5 to 1 MPa and seven speeds ranging from 1 to 11 rev/s. The bearing lubricated with either mineral oil with a viscosity grade of 100 or an environmentally acceptable lubricant (EAL) with a viscosity grade of 100 or 150 is investigated according to the ISO standard. Bearing wear is simulated by increasing the clearance circle by 0.1 mm. According to the results obtained, the use of an EAL in place of mineral oil does not cause significant changes in the bearing performance, regardless of the value of the clearance radius. The pressure distribution in the oil film, bearing load carrying capacity, eccentricity and friction coefficient have similar values for the entire load and speed ranges considered, and the discrepancies in the results are within the range of the measurement errors. Only an increase in EAL viscosity causes significant changes in bearing performance and these changes comply with the general theory of lubrication.
Polish Maritime Research
The paper presents a 3D model of the processes taking place in the cylinder of a large 4-stroke m... more The paper presents a 3D model of the processes taking place in the cylinder of a large 4-stroke marine engine. The model is based on CFD calculations performed on the moving mesh. The modelling range includes the full duty cycle (720° crankshaft position) and the complete geometry of the cylinder with inlet and exhaust ducts. The input data, boundary conditions and validation data were obtained by direct measurements on the real object. Fuel injection characteristics were obtained by Mie scattering measurements in a fixed-volume chamber. The modelling results have been validated in terms of the pressure characteristics of the engine’s cylinder within the entire range of its loads. The mean error did not exceed 1.42% for the maximum combustion pressure and 1.13% for the MIP (Mean Indicated Pressure). The model was also positively validated in terms of the O2 and NOx content of the exhaust gas. The mean error in this case was 1.2% for NOx fractions in the exhaust gas and 0.4% for O2 f...
Polish Maritime Research, 2021
This study compares the performance of a plain bearing, with a similar structure to a tail shaft ... more This study compares the performance of a plain bearing, with a similar structure to a tail shaft stern bearing, lubricated with either mineral oil or an environmentally acceptable lubricant (EAL). The main characteristic of the bearing is its length/diameter ratio of <1. Measurements are carried out with the bearing operating under loads from 0.5 to 1 MPa and seven speeds ranging from 1 to 11 rev/s. The bearing lubricated with either mineral oil with a viscosity grade of 100 or an environmentally acceptable lubricant (EAL) with a viscosity grade of 100 or 150 is investigated according to the ISO standard. Bearing wear is simulated by increasing the clearance circle by 0.1 mm. According to the results obtained, the use of an EAL in place of mineral oil does not cause significant changes in the bearing performance, regardless of the value of the clearance radius. The pressure distribution in the oil film, bearing load carrying capacity, eccentricity and friction coefficient have si...
W artykule przedstawiono celowość kształcenia na symulatorach siłowni okrętowych oraz odniesiono ... more W artykule przedstawiono celowość kształcenia na symulatorach siłowni okrętowych oraz odniesiono się do przepisów regulujących kształcenie na symulatorach siłowni okrętowych. Przedstawiono bazę dydaktyczną symulatorów siłowni okrętowych Akademii Morskiej w Gdyni i dokonano tabelarycznego zestawienia symulatorów z wizualizacją typu 3D. WSTĘP Multimedialne symulatory są obecnie powszechnie wykorzystywane w procesie kształcenia w wielu dziedzinach tj. medycynie, lotnictwie, budownictwie itp. Pierwsze symulatory siłowni okrętowych były wykorzystywane w marynarce wojennej. Już 1933 roku zauważono potrzebę szkolenia wykfalifikowanej kadry morskiej i stworzono pierwszy symulator dla mechaników. Był to trenażer U-Boot'a zbudowany na starym trałowcu z czasów pierwszej wojny światowej [4]. Po roku 1970 wraz z rozwojem technologicznym do opanowania wiedzy potrzebnej w zarządzaniu siłownią morskiego statku towarowego zauważono, że tradycyjne metody nauczania są niewystarczające dla bezpiecznej eksploatacji statku. Błędy eksploatacyjne popełniane na rzeczywistych jednostkach pływających wskazywały na niewystarczające wyszkolenie praktyczne oficerów mechaników. Wzrost automatyzacji siłowni okrętowych, a w dalszym etapie redukcja liczby członków działu maszynowego spowodowały większe wymagania w zakresie wiedzy i umiejętności zawodowych załogi, a przez to zmianę sposobów nauczania w ośrodkach szkoleniowych. Obowiązujące obecnie uregulowania prawne w zakresie kształcenia na symulatorach siłowni okrętowych, nie definiują precyzyjnie programów nauczania. Brak przykładowych scenariuszy ćwiczeń, stwarza dowolność w prowadzeniu tego typu zajęć praktycznych. Instruktorzy symulatorów siłowni okrętowych prowadząc szkolenia na symulatorach, korzystają z wiedzy, którą uzyskali w wyniku zdobywania doświadczenia na obiektach rzeczywistych.
Journal of KONES. Powertrain and Transport, 2016
Increasing public awareness of environmental protection, it has caused a lot of emphasis on the m... more Increasing public awareness of environmental protection, it has caused a lot of emphasis on the marine industry to create reciprocating diesel environmentally friendly. Conducting research on real objects in the laboratory gives us the solution to the problem. However, such studies generate large financial resources, especially for marine engines also take a lot of time. Creating a simulation on a computer allows for the limited financial resources and also speeding up work on the piston marine engine. Computer simulations allow the creation of more complex physical models, which can describe the process of operating a marine diesel engine. However, the complication models cause a problem of the future understanding of the model and the possibility of subsequent use of it, for example for control of the engine. The more it established the need to simplify complex models of engines for better understand the processes occurring in the engine. The article is a description of the Mean Value Engine Model (MVEM), which were analysed individual blocks of the model together with the modifications related to the environment in which the engine will run. Modular model allows better modifying it and adding new blocks. This model is based mainly designed for application control. Because of the simple structure easy to adjust for different types of engines. This is particularly good for use in motor drivers. It allows better matching engine operating parameters to reduce emissions of harmful substances into the environment and also achieve better efficiency of marine engine.
Zeszyty Naukowe Akademii Marynarki Wojennej, 2015
Combustion Engines
The measurement of combustion pressure relies on connecting a pressure sensor to a four-stroke ma... more The measurement of combustion pressure relies on connecting a pressure sensor to a four-stroke marine engine cylinder by a channel led out from the engine cylinder. The geometry of the channel distorts the results of combustion pressure measurements. The purpose of the work is to create a model of combustion processes in engine cylinders. The model uses a mathematical description of the indicator channel on one of the engine cylinders. The input data to the model and the data necessary for its verification came from the direct measurements on the research facility. The test object was a four-stroke Sulzer 3AL25/30 engine loaded by an electric power generator. During calculations, different diameters and lengths of measurement channel were simulated. The obtained results allowed to formulate the conclusion that the geometry of the measurement channel has a significant impact on the measurement results. The increase of the length of the measuring channel as well as the diameter of the...
The article presents an analysis of models used to calculate combustion process parameters in pis... more The article presents an analysis of models used to calculate combustion process parameters in piston engines. One of the applied techniques is modeling based on the mathematical description of physical phenomena. The level of complexity of such a description depends, however, on the purpose of the model, the efficiency of calculations and the possibility of obtaining reliable measurement data. The paper presents various methods of modeling phenomena occurring in the cylinder of a Diesel engine. Presented are assumptions and effects of modeling using models from 0-dimensional and single-zone to complex 3-dimensional models, describing the phenomena of turbulent mass movements using computer fluid mechanics. W artykule znajduje sie analiza modeli wykorzystywanych do obliczania parametrow procesu spalania w silnikach tlokowych. Jedną ze stosowanych technik jest modelowanie oparte na opisie matematycznym zjawisk fizycznych. Poziom zlozoności takiego opisu uzalezniony jest jednak od celu...
Journal of KONES, 2017
Commonly used in the shipbuilding are combustion piston diesel engines that serve as power genera... more Commonly used in the shipbuilding are combustion piston diesel engines that serve as power generators and main propulsion engines. More stringent of environmental regulations, however, require a more detailed understanding of the processes involved in piston engine combustion to reduce emissions to the environment. Also, the main reason for interest in research in the injection system is also the desire to obtain the highest piston engine power at the lowest fuel consumption. The article presents a study of changes in fuel injection pressure, which allows the operator to analyse the thermodynamic processes taking place in the cylinder. The injection pressure measurement allows you to make proper operating, maintenance and even repair decisions on the object under test. The purpose of this article is to investigate the operation of the injection pressure sensor and to compare the pressure curves measured by the Kistler 4067E sensor in various piston engine-operating states and the si...
New Trends in Production Engineering
The work presents a model of the marine diesel engine working process. The research object was th... more The work presents a model of the marine diesel engine working process. The research object was the AL25/30 engine. The model consists of partial models of the combustion process in the engine cylinders, the heat exchange process, flows through air and exhaust channels, heat exchange in the intercooler and friction in mechanical components of the engine. The model includes a description of the processes taking place in the turbocharger also. The input data to the model and the verification data were the results of direct measurements on the research facility. The verification showed errors in the calculation of air and exhaust gas parameters not exceeding 11%. The paper also presents an analysis of the results of fast-changing parameters, including combustion pressure in engine cylinders and pressures in individual gas channels. The designed model allows the analysis of the research facility operation and enables its further development towards the assessment of toxic compounds emiss...
Polish Maritime Research, Dec 1, 2021
This study compares the performance of a plain bearing, with a similar structure to a tail shaft ... more This study compares the performance of a plain bearing, with a similar structure to a tail shaft stern bearing, lubricated with either mineral oil or an environmentally acceptable lubricant (EAL). The main characteristic of the bearing is its length/diameter ratio of <1. Measurements are carried out with the bearing operating under loads from 0.5 to 1 MPa and seven speeds ranging from 1 to 11 rev/s. The bearing lubricated with either mineral oil with a viscosity grade of 100 or an environmentally acceptable lubricant (EAL) with a viscosity grade of 100 or 150 is investigated according to the ISO standard. Bearing wear is simulated by increasing the clearance circle by 0.1 mm. According to the results obtained, the use of an EAL in place of mineral oil does not cause significant changes in the bearing performance, regardless of the value of the clearance radius. The pressure distribution in the oil film, bearing load carrying capacity, eccentricity and friction coefficient have similar values for the entire load and speed ranges considered, and the discrepancies in the results are within the range of the measurement errors. Only an increase in EAL viscosity causes significant changes in bearing performance and these changes comply with the general theory of lubrication.
Polish Maritime Research
The paper presents a 3D model of the processes taking place in the cylinder of a large 4-stroke m... more The paper presents a 3D model of the processes taking place in the cylinder of a large 4-stroke marine engine. The model is based on CFD calculations performed on the moving mesh. The modelling range includes the full duty cycle (720° crankshaft position) and the complete geometry of the cylinder with inlet and exhaust ducts. The input data, boundary conditions and validation data were obtained by direct measurements on the real object. Fuel injection characteristics were obtained by Mie scattering measurements in a fixed-volume chamber. The modelling results have been validated in terms of the pressure characteristics of the engine’s cylinder within the entire range of its loads. The mean error did not exceed 1.42% for the maximum combustion pressure and 1.13% for the MIP (Mean Indicated Pressure). The model was also positively validated in terms of the O2 and NOx content of the exhaust gas. The mean error in this case was 1.2% for NOx fractions in the exhaust gas and 0.4% for O2 f...
Polish Maritime Research, 2021
This study compares the performance of a plain bearing, with a similar structure to a tail shaft ... more This study compares the performance of a plain bearing, with a similar structure to a tail shaft stern bearing, lubricated with either mineral oil or an environmentally acceptable lubricant (EAL). The main characteristic of the bearing is its length/diameter ratio of <1. Measurements are carried out with the bearing operating under loads from 0.5 to 1 MPa and seven speeds ranging from 1 to 11 rev/s. The bearing lubricated with either mineral oil with a viscosity grade of 100 or an environmentally acceptable lubricant (EAL) with a viscosity grade of 100 or 150 is investigated according to the ISO standard. Bearing wear is simulated by increasing the clearance circle by 0.1 mm. According to the results obtained, the use of an EAL in place of mineral oil does not cause significant changes in the bearing performance, regardless of the value of the clearance radius. The pressure distribution in the oil film, bearing load carrying capacity, eccentricity and friction coefficient have si...
W artykule przedstawiono celowość kształcenia na symulatorach siłowni okrętowych oraz odniesiono ... more W artykule przedstawiono celowość kształcenia na symulatorach siłowni okrętowych oraz odniesiono się do przepisów regulujących kształcenie na symulatorach siłowni okrętowych. Przedstawiono bazę dydaktyczną symulatorów siłowni okrętowych Akademii Morskiej w Gdyni i dokonano tabelarycznego zestawienia symulatorów z wizualizacją typu 3D. WSTĘP Multimedialne symulatory są obecnie powszechnie wykorzystywane w procesie kształcenia w wielu dziedzinach tj. medycynie, lotnictwie, budownictwie itp. Pierwsze symulatory siłowni okrętowych były wykorzystywane w marynarce wojennej. Już 1933 roku zauważono potrzebę szkolenia wykfalifikowanej kadry morskiej i stworzono pierwszy symulator dla mechaników. Był to trenażer U-Boot'a zbudowany na starym trałowcu z czasów pierwszej wojny światowej [4]. Po roku 1970 wraz z rozwojem technologicznym do opanowania wiedzy potrzebnej w zarządzaniu siłownią morskiego statku towarowego zauważono, że tradycyjne metody nauczania są niewystarczające dla bezpiecznej eksploatacji statku. Błędy eksploatacyjne popełniane na rzeczywistych jednostkach pływających wskazywały na niewystarczające wyszkolenie praktyczne oficerów mechaników. Wzrost automatyzacji siłowni okrętowych, a w dalszym etapie redukcja liczby członków działu maszynowego spowodowały większe wymagania w zakresie wiedzy i umiejętności zawodowych załogi, a przez to zmianę sposobów nauczania w ośrodkach szkoleniowych. Obowiązujące obecnie uregulowania prawne w zakresie kształcenia na symulatorach siłowni okrętowych, nie definiują precyzyjnie programów nauczania. Brak przykładowych scenariuszy ćwiczeń, stwarza dowolność w prowadzeniu tego typu zajęć praktycznych. Instruktorzy symulatorów siłowni okrętowych prowadząc szkolenia na symulatorach, korzystają z wiedzy, którą uzyskali w wyniku zdobywania doświadczenia na obiektach rzeczywistych.
Journal of KONES. Powertrain and Transport, 2016
Increasing public awareness of environmental protection, it has caused a lot of emphasis on the m... more Increasing public awareness of environmental protection, it has caused a lot of emphasis on the marine industry to create reciprocating diesel environmentally friendly. Conducting research on real objects in the laboratory gives us the solution to the problem. However, such studies generate large financial resources, especially for marine engines also take a lot of time. Creating a simulation on a computer allows for the limited financial resources and also speeding up work on the piston marine engine. Computer simulations allow the creation of more complex physical models, which can describe the process of operating a marine diesel engine. However, the complication models cause a problem of the future understanding of the model and the possibility of subsequent use of it, for example for control of the engine. The more it established the need to simplify complex models of engines for better understand the processes occurring in the engine. The article is a description of the Mean Value Engine Model (MVEM), which were analysed individual blocks of the model together with the modifications related to the environment in which the engine will run. Modular model allows better modifying it and adding new blocks. This model is based mainly designed for application control. Because of the simple structure easy to adjust for different types of engines. This is particularly good for use in motor drivers. It allows better matching engine operating parameters to reduce emissions of harmful substances into the environment and also achieve better efficiency of marine engine.
Zeszyty Naukowe Akademii Marynarki Wojennej, 2015
Combustion Engines
The measurement of combustion pressure relies on connecting a pressure sensor to a four-stroke ma... more The measurement of combustion pressure relies on connecting a pressure sensor to a four-stroke marine engine cylinder by a channel led out from the engine cylinder. The geometry of the channel distorts the results of combustion pressure measurements. The purpose of the work is to create a model of combustion processes in engine cylinders. The model uses a mathematical description of the indicator channel on one of the engine cylinders. The input data to the model and the data necessary for its verification came from the direct measurements on the research facility. The test object was a four-stroke Sulzer 3AL25/30 engine loaded by an electric power generator. During calculations, different diameters and lengths of measurement channel were simulated. The obtained results allowed to formulate the conclusion that the geometry of the measurement channel has a significant impact on the measurement results. The increase of the length of the measuring channel as well as the diameter of the...
The article presents an analysis of models used to calculate combustion process parameters in pis... more The article presents an analysis of models used to calculate combustion process parameters in piston engines. One of the applied techniques is modeling based on the mathematical description of physical phenomena. The level of complexity of such a description depends, however, on the purpose of the model, the efficiency of calculations and the possibility of obtaining reliable measurement data. The paper presents various methods of modeling phenomena occurring in the cylinder of a Diesel engine. Presented are assumptions and effects of modeling using models from 0-dimensional and single-zone to complex 3-dimensional models, describing the phenomena of turbulent mass movements using computer fluid mechanics. W artykule znajduje sie analiza modeli wykorzystywanych do obliczania parametrow procesu spalania w silnikach tlokowych. Jedną ze stosowanych technik jest modelowanie oparte na opisie matematycznym zjawisk fizycznych. Poziom zlozoności takiego opisu uzalezniony jest jednak od celu...
Journal of KONES, 2017
Commonly used in the shipbuilding are combustion piston diesel engines that serve as power genera... more Commonly used in the shipbuilding are combustion piston diesel engines that serve as power generators and main propulsion engines. More stringent of environmental regulations, however, require a more detailed understanding of the processes involved in piston engine combustion to reduce emissions to the environment. Also, the main reason for interest in research in the injection system is also the desire to obtain the highest piston engine power at the lowest fuel consumption. The article presents a study of changes in fuel injection pressure, which allows the operator to analyse the thermodynamic processes taking place in the cylinder. The injection pressure measurement allows you to make proper operating, maintenance and even repair decisions on the object under test. The purpose of this article is to investigate the operation of the injection pressure sensor and to compare the pressure curves measured by the Kistler 4067E sensor in various piston engine-operating states and the si...
New Trends in Production Engineering
The work presents a model of the marine diesel engine working process. The research object was th... more The work presents a model of the marine diesel engine working process. The research object was the AL25/30 engine. The model consists of partial models of the combustion process in the engine cylinders, the heat exchange process, flows through air and exhaust channels, heat exchange in the intercooler and friction in mechanical components of the engine. The model includes a description of the processes taking place in the turbocharger also. The input data to the model and the verification data were the results of direct measurements on the research facility. The verification showed errors in the calculation of air and exhaust gas parameters not exceeding 11%. The paper also presents an analysis of the results of fast-changing parameters, including combustion pressure in engine cylinders and pressures in individual gas channels. The designed model allows the analysis of the research facility operation and enables its further development towards the assessment of toxic compounds emiss...