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Papers by Jan Drzewieniecki

Research paper thumbnail of Application of Acoustic Emission in Research of Phenomenon Occurring in High Pressure Fuel Oil Pipes of Marine Diesel Engines

Acoustic emission signal, diagnosis, marine diesel engine, injection system, injection process. S... more Acoustic emission signal, diagnosis, marine diesel engine, injection system, injection process. Summary This article presents the possibilities of AE signal application in the diagno-sis of the technical condition of marine diesel engines, while taking into consid-eration injection systems in the range of the evaluation of the repeatability of fuel injection pressure. It describes the phenomenon and characterized distur-bances in the injection pipe and their influence on the AE signal changes. On the basis of results of the research, the analysis of the AE signal presenting the coarse of fuel pressure changes in the injection pipe and pump was done, and there were distinguished friction processes occurring in the precise pair of injec-tion pump and field characterizing the flow out of fuel from injector.

Research paper thumbnail of Evaluation of Piston-Rings-Cylinder Liner Assembly Wear in Marine Main Propulsion Diesel Engines

This paper presents operational evaluation of piston-piston rings-cylinder liner (PRC) assembly w... more This paper presents operational evaluation of piston-piston rings-cylinder liner (PRC) assembly wear in marine diesel engines. It is shown that piston ring gap measurements can be used as a reference parameter in wear trend analysis to predict length of time periods between overhauls (TBO). Factors indicating the necessity of an overhaul and introducing operational methods of improving working conditions between the tribological pair – liner and piston rings have been determined. Keywords: tribological wear, tribological node, marine main large propulsion diesel engines, piston-piston rings-cylinder liner assembly, the top layer, scavenge ports.

Research paper thumbnail of Operational evaluation of piston ring wear in large marine diesel engines

Journal of Polish CIMAC, 2012

This article presents operational evaluation of piston ring wear in large marine diesel engines b... more This article presents operational evaluation of piston ring wear in large marine diesel engines based on inspection through cylinder liner scavenge ports. It contains a description of verification methods of piston rings based on visual inspections, clearance measurement of piston rings in piston grooves and piston rings gap measurement. Moreover, it is indicated that piston ring gap measurements can lead to an evaluation of piston ring wear and by calculating into running hours can be treated as a reference parameter at next inspections and a parameter determining wear trends. Furthermore, application of chromium layers on working surfaces of piston rings enforces the need to control chromium layer wear by measuring the layer thickness by induction and eddy current methods. Concluding, the authors discussed constructional – operational methods of improvement between tribological pair – liner and piston rings in working conditions .

Research paper thumbnail of Possibilities of using the free-end of crankshaft in diagnosis of slow speed marine diesel engines

Journal of Polish CIMAC, 2011

In this article there are discussed possibilities in diagnosis of large marine diesel engines by ... more In this article there are discussed possibilities in diagnosis of large marine diesel engines by utilization the freeend of crankshaft in gaining information about engine load in particular cylinders on the basis of course of crankshaft’s transient rotational speed overlapped by torsional vibration. There is defined and calculated crankshaft’s transfer function for torsional vibration being crankshaft’s response to exciting force caused by crank pin efforts. There is presented methodology of reconstruction of crank pin efforts’ course on the basis of calculated transfer function and measured in any given condition course of crankshaft’s speed. There are indicated that similarities between courses of torsional vibration in time and frequency domain for slow and medium speed marine diesel engines will allow to apply the presented methodology of reconstruction of crank pin efforts’ course in large marine diesel engines.

Research paper thumbnail of Operational problems in marine diesel engines switching on low sulfur fuels before entering emission controlled areas

Introduction of rules connected with implementation of Sulfur Emission Control Areas and changes ... more Introduction of rules connected with implementation of Sulfur Emission Control Areas and changes in MARPOL Convention Annex VI not only increased the operation costs or forced ship owners to comply with convention but first of all put pressure and provided influence on ship’s operation. In this article there are presented operational problems in Marine Diesel Engines switching from the residual fuels HFO to low sulfur residual LSFO and distillate LSGO fuels before entering Emission Control Areas (ECAs). There are defined ECA Zones in Europe and North America. There are introduced changes in limits with regards to Sulfur content in fuel oils during last years, planed trends and changes. There are characterized the changing over process, the applied procedures and methods of time calculation in changing over from HFO into LSFO/ LSGO. Besides, there are described the method of sulfur calculation in fuel during blending both grades of fuel. To conclude authors have characterized technic...

Research paper thumbnail of A New Method of Identifying the Limit Condition of Injection Pump Wear in Self-Ignition Engines

Energies

The quality or reliability of diagnostics is understood as obtaining the most likely diagnosis, a... more The quality or reliability of diagnostics is understood as obtaining the most likely diagnosis, and finding possible causes leading to incorrect operation of the system. In real engine running conditions it is often very difficult. Dependable methods providing the most reliable diagnoses have not been developed yet. It becomes more and more important to identify the limit state in condition monitoring—the state that should not be exceeded because continued operation of such a machine is not advisable for technical, economic, or operational safety reasons. The authors have implemented a method using acoustic emission signal analysis for the identification of the injection pump limit state in a working engine. The use of the cross gain function allows one to reliably diagnose limit conditions related to the wear of the precision pair in injection pumps of running engines, working as energy transmission systems on ships and in land-based power stations. The paper draws the results for ...

Research paper thumbnail of The Use of Acoustic Emission to Diagnosis of Fuel Injection Pumps of Marine Diesel Engines

Energies

The article draws attention to the problems of maintaining fuel injection pumps of marine diesel ... more The article draws attention to the problems of maintaining fuel injection pumps of marine diesel engines in the conditions of the use of residual fuels in which the quality is steadily deteriorating. The analysis of tribological processes occurring in hydraulic precision pairs of fuel injection pumps, such as a barrel-plunger, is presented. Problems occurring regarding the operation of injection pumps and the possibilities of their avoidance on board are discussed. The means of condition monitoring, including the application of thermography methods, are characterized. The authors have done research concerning diagnosing injection systems of high and medium power engines by using acoustic emission (AE) signals. The experiment results obtained with the use of acoustic emission and wavelet analysis confirmed the dependency of the frequency components contained in the acoustic emission signal on the condition state of the injector pumps’ tribological pair.

Research paper thumbnail of Operational Problems in Slow Speed Diesel Engines Caused by Use of Poor Quality Fuels with High Cat-Fines Content

The article is focused on operational problems occurring in elements of slow speed, crosshead die... more The article is focused on operational problems occurring in elements of slow speed, crosshead diesel engines such as piston – piston rings – cylinder liner assembly and fuel injection pumps caused by use of poor quality fuels with high content of catalytic fines. There are characterized common contaminants in these fuels with special attention to the most harmful the residual fuel catalytic particles socalled Cat-Fines, specified the maximum limits and described their influence on engine’s tribological pairs. Furthermore, this paper considers the operational precautions and treatment of poor quality fuels with elaboration of specific procedures to prevent and reduce the influence of Cat-fines to tribological wear in engine elements and containing issues of condition monitoring of engine elements.

Research paper thumbnail of Application of Acoustic Emission in Research of Phenomenon Occurring in High Pressure Fuel Oil Pipes of Marine Diesel Engines

Acoustic emission signal, diagnosis, marine diesel engine, injection system, injection process. S... more Acoustic emission signal, diagnosis, marine diesel engine, injection system, injection process. Summary This article presents the possibilities of AE signal application in the diagno-sis of the technical condition of marine diesel engines, while taking into consid-eration injection systems in the range of the evaluation of the repeatability of fuel injection pressure. It describes the phenomenon and characterized distur-bances in the injection pipe and their influence on the AE signal changes. On the basis of results of the research, the analysis of the AE signal presenting the coarse of fuel pressure changes in the injection pipe and pump was done, and there were distinguished friction processes occurring in the precise pair of injec-tion pump and field characterizing the flow out of fuel from injector.

Research paper thumbnail of Evaluation of Piston-Rings-Cylinder Liner Assembly Wear in Marine Main Propulsion Diesel Engines

This paper presents operational evaluation of piston-piston rings-cylinder liner (PRC) assembly w... more This paper presents operational evaluation of piston-piston rings-cylinder liner (PRC) assembly wear in marine diesel engines. It is shown that piston ring gap measurements can be used as a reference parameter in wear trend analysis to predict length of time periods between overhauls (TBO). Factors indicating the necessity of an overhaul and introducing operational methods of improving working conditions between the tribological pair – liner and piston rings have been determined. Keywords: tribological wear, tribological node, marine main large propulsion diesel engines, piston-piston rings-cylinder liner assembly, the top layer, scavenge ports.

Research paper thumbnail of Operational evaluation of piston ring wear in large marine diesel engines

Journal of Polish CIMAC, 2012

This article presents operational evaluation of piston ring wear in large marine diesel engines b... more This article presents operational evaluation of piston ring wear in large marine diesel engines based on inspection through cylinder liner scavenge ports. It contains a description of verification methods of piston rings based on visual inspections, clearance measurement of piston rings in piston grooves and piston rings gap measurement. Moreover, it is indicated that piston ring gap measurements can lead to an evaluation of piston ring wear and by calculating into running hours can be treated as a reference parameter at next inspections and a parameter determining wear trends. Furthermore, application of chromium layers on working surfaces of piston rings enforces the need to control chromium layer wear by measuring the layer thickness by induction and eddy current methods. Concluding, the authors discussed constructional – operational methods of improvement between tribological pair – liner and piston rings in working conditions .

Research paper thumbnail of Possibilities of using the free-end of crankshaft in diagnosis of slow speed marine diesel engines

Journal of Polish CIMAC, 2011

In this article there are discussed possibilities in diagnosis of large marine diesel engines by ... more In this article there are discussed possibilities in diagnosis of large marine diesel engines by utilization the freeend of crankshaft in gaining information about engine load in particular cylinders on the basis of course of crankshaft’s transient rotational speed overlapped by torsional vibration. There is defined and calculated crankshaft’s transfer function for torsional vibration being crankshaft’s response to exciting force caused by crank pin efforts. There is presented methodology of reconstruction of crank pin efforts’ course on the basis of calculated transfer function and measured in any given condition course of crankshaft’s speed. There are indicated that similarities between courses of torsional vibration in time and frequency domain for slow and medium speed marine diesel engines will allow to apply the presented methodology of reconstruction of crank pin efforts’ course in large marine diesel engines.

Research paper thumbnail of Operational problems in marine diesel engines switching on low sulfur fuels before entering emission controlled areas

Introduction of rules connected with implementation of Sulfur Emission Control Areas and changes ... more Introduction of rules connected with implementation of Sulfur Emission Control Areas and changes in MARPOL Convention Annex VI not only increased the operation costs or forced ship owners to comply with convention but first of all put pressure and provided influence on ship’s operation. In this article there are presented operational problems in Marine Diesel Engines switching from the residual fuels HFO to low sulfur residual LSFO and distillate LSGO fuels before entering Emission Control Areas (ECAs). There are defined ECA Zones in Europe and North America. There are introduced changes in limits with regards to Sulfur content in fuel oils during last years, planed trends and changes. There are characterized the changing over process, the applied procedures and methods of time calculation in changing over from HFO into LSFO/ LSGO. Besides, there are described the method of sulfur calculation in fuel during blending both grades of fuel. To conclude authors have characterized technic...

Research paper thumbnail of A New Method of Identifying the Limit Condition of Injection Pump Wear in Self-Ignition Engines

Energies

The quality or reliability of diagnostics is understood as obtaining the most likely diagnosis, a... more The quality or reliability of diagnostics is understood as obtaining the most likely diagnosis, and finding possible causes leading to incorrect operation of the system. In real engine running conditions it is often very difficult. Dependable methods providing the most reliable diagnoses have not been developed yet. It becomes more and more important to identify the limit state in condition monitoring—the state that should not be exceeded because continued operation of such a machine is not advisable for technical, economic, or operational safety reasons. The authors have implemented a method using acoustic emission signal analysis for the identification of the injection pump limit state in a working engine. The use of the cross gain function allows one to reliably diagnose limit conditions related to the wear of the precision pair in injection pumps of running engines, working as energy transmission systems on ships and in land-based power stations. The paper draws the results for ...

Research paper thumbnail of The Use of Acoustic Emission to Diagnosis of Fuel Injection Pumps of Marine Diesel Engines

Energies

The article draws attention to the problems of maintaining fuel injection pumps of marine diesel ... more The article draws attention to the problems of maintaining fuel injection pumps of marine diesel engines in the conditions of the use of residual fuels in which the quality is steadily deteriorating. The analysis of tribological processes occurring in hydraulic precision pairs of fuel injection pumps, such as a barrel-plunger, is presented. Problems occurring regarding the operation of injection pumps and the possibilities of their avoidance on board are discussed. The means of condition monitoring, including the application of thermography methods, are characterized. The authors have done research concerning diagnosing injection systems of high and medium power engines by using acoustic emission (AE) signals. The experiment results obtained with the use of acoustic emission and wavelet analysis confirmed the dependency of the frequency components contained in the acoustic emission signal on the condition state of the injector pumps’ tribological pair.

Research paper thumbnail of Operational Problems in Slow Speed Diesel Engines Caused by Use of Poor Quality Fuels with High Cat-Fines Content

The article is focused on operational problems occurring in elements of slow speed, crosshead die... more The article is focused on operational problems occurring in elements of slow speed, crosshead diesel engines such as piston – piston rings – cylinder liner assembly and fuel injection pumps caused by use of poor quality fuels with high content of catalytic fines. There are characterized common contaminants in these fuels with special attention to the most harmful the residual fuel catalytic particles socalled Cat-Fines, specified the maximum limits and described their influence on engine’s tribological pairs. Furthermore, this paper considers the operational precautions and treatment of poor quality fuels with elaboration of specific procedures to prevent and reduce the influence of Cat-fines to tribological wear in engine elements and containing issues of condition monitoring of engine elements.