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The operation of injection apparatus in self-ignition engines results from the design, manufacturing technology and wear and tear during operation. The technical state of the injector apparatus significantly affects the engine performance, fuel consumption, toxicity and smoke opacity of outlet gases. The most unreliable element of the injection apparatus is the injector nozzle, the quality of which depends on the quality of construction and production, operating conditions and the of the fuels used, etc. One of the design parameters of the injector nozzles, determining the technical state is the geometry of the nozzle holes. An attempt was made to optimize the selection of the dimensions and surface condition of the spray holes to significantly affect the flow properties of the injector nozzles and, consequently, to decide on the size and form of fuel dosed streams to individual cylinders of a self-ignition engine and the quality of fuel atomization. In work, a simulation model was developed, and the pressure losses and the mass fluid of the injected fuel were minimized for selected significant geometric features, taking into account the influence of operating conditions. With the use of Mathematica software, simulation optimization methods and methods based on evolutionary algorithms were elaborated.
Jan Monieta; Lech Kasyk. Optimization of Design and Technology of Injector Nozzles in Terms of Minimizing Energy Losses on Friction in Compression Ignition Engines. Applied Sciences 2021, 11, 7341 .
AMA StyleJan Monieta, Lech Kasyk. Optimization of Design and Technology of Injector Nozzles in Terms of Minimizing Energy Losses on Friction in Compression Ignition Engines. Applied Sciences. 2021; 11 (16):7341.
Chicago/Turabian StyleJan Monieta; Lech Kasyk. 2021. "Optimization of Design and Technology of Injector Nozzles in Terms of Minimizing Energy Losses on Friction in Compression Ignition Engines." Applied Sciences 11, no. 16: 7341.
Loads at which diagnostic research should be carried out were selected of operational investigation and preliminary diagnostic tests. It is difficult to keep the load constant during operational tests, so there is a need to apply the theory of the experiment. Operational investigation determined, the average and representative loads of tested engines driving generators. In preliminary diagnostic tests, the effects of loading on values of diagnostic parameters in various domains of signals analysis were checked and used to reduce the range the diagnostic research. Besides, the most useful symptoms were selected based on the correlation with the load. The diagnostic of pressure in the injection subsystem and in-cylinder pressure signals were subjected to time frequency analysis. In the principal studies, attempts were made to investigate the value of diagnostic symptoms while maintaining a constant load. For operating marine combustion engines, it is difficult to obtain repeatable test conditions because it is dependent on the principles of engine control and consumption of electricity by shipboard receivers. In operational tests on sea-going vessels, a wireless load measurement system and a system for processing and analyzing the parameters of working and residual processes were used. The wireless simultaneous load measurement system was effective in cases where load indicators and meters were away from the diagnosed objects. A wireless load and selected signals transmission system was used in tests on the ship. The aim of the article is to develop diagnostic models for bringing different test conditions to the common representative and reliable diagnostic decision. The article presents how to adjust diagnostic parameters of the working process, recorded at slightly different loads, to the value of common and equal load. This was done based on the best-fitted approximation model.
Jan Monieta. Diagnosing Marine Piston Engines Driving Generators at Different Operational Loads. Journal of Marine Science and Engineering 2021, 9, 132 .
AMA StyleJan Monieta. Diagnosing Marine Piston Engines Driving Generators at Different Operational Loads. Journal of Marine Science and Engineering. 2021; 9 (2):132.
Chicago/Turabian StyleJan Monieta. 2021. "Diagnosing Marine Piston Engines Driving Generators at Different Operational Loads." Journal of Marine Science and Engineering 9, no. 2: 132.
During scientificstudies on reciprocating self-ignition marine engines, varying data are often needed. Such data are often in various collections and obtaining some of these is very difficult. Therefore, as it was elaborated in the electronic database about the important marine reciprocating combustion engine producers for the needs of operating scientific investigations aiming at gathering the essential information and technical data in one set. This article also presents a reference to existing databases. Important and globally known companies, as well as their constant and variable data, were described. These data were obtained from various printed and virtual sources of information. These data were selected and compiled in the environment of the Microsoft Access computer program. The collected information was divided between main propulsion and auxiliary engines, containing data about manufacturers, types, and technical parameters of slow, medium, or high-speed combustion engines. This database is constantly updated and rebuilt according to the constructions and changes on the engine production market as the result of economic and ecological functions. It is a relative type database, which contains information about technical data of combustion engines. Marine combustion engines are usually operated for dozens of years after they have been produced, whereas producers merge, change their names, or stop existing. Therefore, a digital-knowledge-management platform was developed in the virtual space in which information on scientific and technical resources was integrated of competing manufacturers with the option of introducing updates.
Jan Monieta; Adrian Sendecki. Database and Knowledge about Essential Manufacturers of Marine Self-Ignition Engines. Journal of Marine Science and Engineering 2020, 8, 239 .
AMA StyleJan Monieta, Adrian Sendecki. Database and Knowledge about Essential Manufacturers of Marine Self-Ignition Engines. Journal of Marine Science and Engineering. 2020; 8 (4):239.
Chicago/Turabian StyleJan Monieta; Adrian Sendecki. 2020. "Database and Knowledge about Essential Manufacturers of Marine Self-Ignition Engines." Journal of Marine Science and Engineering 8, no. 4: 239.
This paper presents the planning of an experiment aimed at determining the scope of scientific research. It has been demonstrated in the conducted reliability investigations that main and auxiliary combustion engines, chosen as the objects of marine vessels, are the most unreliable components of injection apparatus as a weak link of a fuel feed functional system. The author seeks to use the minimum number of diagnostic parameters to obtain the maximum amount of information about the state of the test object. Reliability indexes, theoretical research and preliminary diagnostic tests were used to select the diagnostic signal reception points. In the initial determination of the measured quantities, the following methods were used: decomposition of the combustion engine on a functional systems, significant assemblies and elements, analysis of working and residual processes. Preliminary tests of the injection subsystem were carried out outside the internal combustion engine, as well as tests on real objects in laboratory conditions and in the conditions of marine vessels. To obtain a lot of information about the research object, a lot of diagnostic parameters were used at the beginning. On this basis, the preliminary selection of signals and diagnostic parameters related to the technical state was carried out, conducting the analysis in the various domains. Methodical and experimental diagnostic models were elaborated.
Jan Monieta. Selection of Diagnostic Symptoms and Injection Subsystems of Marine Reciprocating Internal Combustion Engines. Applied Sciences 2019, 9, 1540 .
AMA StyleJan Monieta. Selection of Diagnostic Symptoms and Injection Subsystems of Marine Reciprocating Internal Combustion Engines. Applied Sciences. 2019; 9 (8):1540.
Chicago/Turabian StyleJan Monieta. 2019. "Selection of Diagnostic Symptoms and Injection Subsystems of Marine Reciprocating Internal Combustion Engines." Applied Sciences 9, no. 8: 1540.
To choose the receive locations of diagnostic signals, reliability and preliminary investigations were applied. The functional systems and the most unreliable subassemblies were determined. The studies were conducted for the auxiliary marine engines with the same rated speed and fueled with same distillation and residual fuels. In the article a choice of the ship's object, which has a significant impact on reliability, operating costs and the functions performed, is presented. Reliability, economic and risk of exploitation investigations were carried out, which allowed selecting the facility with the highest failure, costs of adverse events and threat to the natural environment. The research covered the objects of a ship owner operating mainly bulk cargo vessels for mass transport and their essential assemblies - combustion engines.In order to obtain a reasonable amount of information on the state of the examined combustion engine, the following experimental planning methods were used: experiment type, essential elements, location of measurement sensors, measured quantities, test conditions, measurement frequencies, measurement data analysis and inference methods, etc.The reliability indicators and preliminary diagnostic tests were used to select the diagnostic signal reception points. Functional systems and the most unreliable subassemblies were defined in this way. The tests were carried out for auxiliary marine engines with the same rotational speed and fueled by distillation and residual fuels. The tests were conducted for several types of combustion engines.
Jan Monieta. Experiment designing in operating investigations of subassembly of the marine energy systems. E3S Web of Conferences 2018, 46, 00020 .
AMA StyleJan Monieta. Experiment designing in operating investigations of subassembly of the marine energy systems. E3S Web of Conferences. 2018; 46 ():00020.
Chicago/Turabian StyleJan Monieta. 2018. "Experiment designing in operating investigations of subassembly of the marine energy systems." E3S Web of Conferences 46, no. : 00020.
The article presents the determination of an exemplary measure in the assessment of the technical state of sets of mechanical objects at the stage of manufacture, use and maintenance. The technical state of the assemblies is influenced by the quality of the friction-cooperating elements, the quality of basic functions, the surroundings and the diameter clearance of kinematic node components. Energy wasted to overcome the frictional resistance is a significant part of the energy supplied, which is why current friction losses are minimized. The article includes analysis of the phenomena occurring in the cylindrical pairs in the presence of static and kinetic friction. The many factors affecting the course and values of friction force between cylindrical elements performing relative reciprocating motion have been indicated. The subject of the article is the method of measuring the friction force between a fixed and movable cylindrical element of the mechanical object. The gradual increase of the friction force component takes place by means of easily accessible force. The results of experimental tests of the friction force in different laboratory conditions under are also included. The effect on the measured friction force was investigated: of friction elements geometry and the surface condition after manufacture and/or operation. Scatter results of static friction force depending on the geometry and surface state can be significant. Examples of surface state images are shown. A friction force model was also developed depending on factors affecting its value.
Jan Monieta. Problems of Friction Force Measurement between Cylindrical Outdoor and Internal Slide Parts. Multidisciplinary Aspects of Production Engineering 2018, 1, 19 -25.
AMA StyleJan Monieta. Problems of Friction Force Measurement between Cylindrical Outdoor and Internal Slide Parts. Multidisciplinary Aspects of Production Engineering. 2018; 1 (1):19-25.
Chicago/Turabian StyleJan Monieta. 2018. "Problems of Friction Force Measurement between Cylindrical Outdoor and Internal Slide Parts." Multidisciplinary Aspects of Production Engineering 1, no. 1: 19-25.
The intensity of infrared radiation emitted by objects depends mainly on their temperature. One of the diagnostic signals may be the temperature field. In infrared thermography, this quantity is used as an indicator of the technical condition of marine objects. The article presents an overview of the use of infrared thermography for the diagnosis mainly of marine piston floating objects and various types of reciprocating internal combustion engines as well as examples of own research results. A general introduction to infrared thermography and common procedures for temperature measurement and non-destructive testing are presented. Experimental research was carried out both in laboratory conditions and in the operating conditions of sea-going vessels. Experimental studies consisted of the presentation of photographs of the same objects made in visible light and the use of infrared thermography. The same objects were also compared, but for different cylinders of the tested internal combustion engines as well as for the up state and fault state. The characteristics of the temperature values at selected points were taken depending on the engine load along with the approximation mathematical models of these dependencies.
Jan Monieta. The use of thermography in the diagnosis of ship piston internal combustion engines. MATEC Web of Conferences 2018, 182, 01027 .
AMA StyleJan Monieta. The use of thermography in the diagnosis of ship piston internal combustion engines. MATEC Web of Conferences. 2018; 182 ():01027.
Chicago/Turabian StyleJan Monieta. 2018. "The use of thermography in the diagnosis of ship piston internal combustion engines." MATEC Web of Conferences 182, no. : 01027.
Jan Monieta; Marcin Nowicki. Experimental manners of a interference reduction of chosen measuring signals of a generating set in conditions of a marine power plants. Diagnostyka 2018, 19, 93 -102.
AMA StyleJan Monieta, Marcin Nowicki. Experimental manners of a interference reduction of chosen measuring signals of a generating set in conditions of a marine power plants. Diagnostyka. 2018; 19 (1):93-102.
Chicago/Turabian StyleJan Monieta; Marcin Nowicki. 2018. "Experimental manners of a interference reduction of chosen measuring signals of a generating set in conditions of a marine power plants." Diagnostyka 19, no. 1: 93-102.
Jan Monieta. Fundamental investigations of marine engines turbochargers diagnostic with use acceleration vibration signals. 2018, 1 .
AMA StyleJan Monieta. Fundamental investigations of marine engines turbochargers diagnostic with use acceleration vibration signals. . 2018; ():1.
Chicago/Turabian StyleJan Monieta. 2018. "Fundamental investigations of marine engines turbochargers diagnostic with use acceleration vibration signals." , no. : 1.
Turbochargers are important assembles of marine reciprocating internal combustion engines. Supervision of that technical state is limited to the thermodynamic parameters, so there are often gradual and sudden failures to leading a state of unfitness of the entire internal combustion engine. The article presents the results of preliminary diagnostics investigations of turbochargers carried out in laboratory and ships conditions of three types of four-stroke engines. Researches were aimed at choice of used work and residual processes, places of the locations of sensors, domain of signal analysis and diagnostic symptoms. In assessing diagnostic symptoms were checked for that sensitiveness to engine load, and the selected simulated technical states determined from reliability. Selected vibration and thermodynamic processes were examined. In preliminary examinations have showed that the value of the engine load significantly affects the diagnostic parameters. Selected diagnostic symptoms and measures in preliminary examinations proved to be sensitive to the proposed locations of sensors, types and domains signals analyzes. Applied diagnostic symptoms in preliminary investigations have proven to be sensitive to the simulated destructive changes in the technical state in principal research. Some of thermodynamic symptoms, as well the vibration processes were recognized interesting.
Jan Monieta. Preliminary Investigations of Marine Diesel Engines Turbochargers Diagnostic. Applied Condition Monitoring 2017, 10, 81 -90.
AMA StyleJan Monieta. Preliminary Investigations of Marine Diesel Engines Turbochargers Diagnostic. Applied Condition Monitoring. 2017; 10 ():81-90.
Chicago/Turabian StyleJan Monieta. 2017. "Preliminary Investigations of Marine Diesel Engines Turbochargers Diagnostic." Applied Condition Monitoring 10, no. : 81-90.
The article presents an analysis of phenomena of selected elements of piston internal combustion engines cooperating with the combustion chamber and issues related to tribological aspects. It shows an attempt to assess the state of the tribological nodes: the valve stem – valve guide and valve head – valve seat in random natural conditions. Passive and passive-active experiments were conducted in the conditions of the operation of sea ships. The effects of complex and changeable inputs were examined on the value of the normal and pathological wear in the operation of medium-speed engines. Images of wear and damaged items of tribological nodes were studied. Analysis was conducted of digital images of real objects and using an optical microscope and measurements of macro- and micro-geometry. An identification of basic processes of wear was taken.
Jan Monieta. ANALYSIS OF THE TRIBOLOGY PROCESSES OF CONTROL VALVES OF MEDIUM SPEED MARINE INTERNAL COMBUSTION ENGINES. Tribologia 2017, 55 -63.
AMA StyleJan Monieta. ANALYSIS OF THE TRIBOLOGY PROCESSES OF CONTROL VALVES OF MEDIUM SPEED MARINE INTERNAL COMBUSTION ENGINES. Tribologia. 2017; (4):55-63.
Chicago/Turabian StyleJan Monieta. 2017. "ANALYSIS OF THE TRIBOLOGY PROCESSES OF CONTROL VALVES OF MEDIUM SPEED MARINE INTERNAL COMBUSTION ENGINES." Tribologia , no. 4: 55-63.
The article presents the stages of fuel injection modeling of the four-stroke marine diesel engines as a set of functional blocks the of the fuel waves flow. The elaborated model includes the values of changing pressures in the combustion chamber and the course of changes of the pressure in spaces of the injection pump, injection pipe and the injector. Linear and local losses, as well as the conditions for the functioning were taken into account in stages of the fuel flow. The influence of different values of the engine load on the pressure course of the in individual spaces of injection apparatus and in the engine cylinder during the working cycle depending on the crank angle of rotation of the crankshaft have been simulated. The mathematical relationships were selected and the structural and experimental data are used, allowing the calculation of the parameters of interest for the simulated process.
Jan Monieta. Modelling of the fuel injection of medium speed marine diesel engines. Aim Your Enthusiasm: Targeting Increased Middle Class Health Insurance Tax Credits 2017, 170, 139 -146.
AMA StyleJan Monieta. Modelling of the fuel injection of medium speed marine diesel engines. Aim Your Enthusiasm: Targeting Increased Middle Class Health Insurance Tax Credits. 2017; 170 (3):139-146.
Chicago/Turabian StyleJan Monieta. 2017. "Modelling of the fuel injection of medium speed marine diesel engines." Aim Your Enthusiasm: Targeting Increased Middle Class Health Insurance Tax Credits 170, no. 3: 139-146.