The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Marek J Glogowski - One of the best experts on this subject based on the ideXlab platform.
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additives contents in pag and synthetic motor base oils and their effect on electrostatic phenomena in a Rotating Shaft oil lip seal system
IEEE Transactions on Dielectrics and Electrical Insulation, 2013Co-Authors: Juliusz B Gajewski, Marek J GlogowskiAbstract:The paper presents the results of experiments on the electrostatic aspects of anti-wear (AW) and friction modifier (FM) additives (agents) when these are added to PAG (polyalkylene glycol) and PAO 6 (synthetic) motor base oils to obtain their blends. Experiments are carried out in a Rotating Shaft-oil-lip seal system (a friction junction) which is a specially built experimental facility to be the simplified model of an engine crankcase in the interior of which an earthed metal Shaft rotates at given angular velocities from 500 up to 1000 rpm. The AW and FM additives contents in blends are 0.1 and 0.5 wt%. Oil temperature is controlled electronically and changed from 60 up to 110°C. An 88-mm diameter lip seal is used in the experiments. Electric potential of a stiffening ring of the lip seal tested is measured directly with an electrometer. The experimental results are the relationships of the potential induced in a stiffening ring to Shaft's angular velocity and to the temperature of pure base oils and their blends with AW and FM agents.
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tribocharging in a Rotating Shaft oil lip seal system for different engine base oils additive and their blends
Journal of Electrostatics, 2009Co-Authors: Juliusz B Gajewski, Marek J GlogowskiAbstract:Abstract The paper presents the results of experiments on tribocharging of different mineral, semisynthetic, and synthetic base oils and their blends with additives. An antiwear additive ZDDP (zinc dialkyldithiophosphate) is tested when added to base oils in different percentages by weight. Experiments are carried out on the specially built experimental facility to be a simplified model of an engine crankcase in whose interior an earthed metal Shaft rotates at given angular velocities. The potential of a stiffening ring of a lip seal is measured directly with an electrometer. The potential is a measure of tribocharging in a Rotating Shaft–oil–lip seal system, friction junction, and especially between both interfaces: Shaft surface–oil and oil–lip of a lip seal. The experimental results are presented in the form of some characteristics that are relationships of the potential induced in the stiffening ring with oil's temperature for different angular Shaft's velocities and additives, contents. The oil's temperature ranges from 60 to 110 °C and is controlled automatically. The angular velocities of a Shaft used are 500 and 1500 rpm. The additive contents in the blends with different base oils are 0.1 and 0.2%. The pure base oils of all the types and some lip seals are also examined. Moreover, the influence of an external DC electric field applied between the earthed Shaft and the stiffening ring on the braking torque of the Shaft is examined for a range of temperatures of the pure oils and their blends with the additive used, angular velocities, and additive contents. The electric field is produced while applying the high DC voltage of both polarities between the Shaft and the ring. The absolute value of the voltage is in a range from 500 to 1500 V.
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Effects of engine base oil type and ZDDP on the electrical double layer in the Rotating Shaft-oil-lip seal system with and without an external DC electric field
2008 IEEE International Conference on Dielectric Liquids ICDL 2008, 2008Co-Authors: Juliusz B Gajewski, Marek J GlogowskiAbstract:The paper presents the results of experiments on tribo-charging of\na blend of mineral base oil and different zinc dialkylditophosphate\n(ZDDP) contents. Experiments were carried out on the specially built\nexperimental facility to be a simplified model of an engine crankcase\nin whose interior an earthed metal Shaft rotated at given angular\nvelocities. The potential of a stiffening ring of a lip seal was\nmeasured directly with an electrometer. The experimental results\nare presented in the form of some characteristics that are relationships\nof the potential induced on the stiffening ring to the oil temperature\nfor different angular Shaft velocities and the ZDDP contents. Also\nthe effects of an external DC electric field on the braking torque\nof the steel Shaft were examined for a range of oil temperatures,\nangular velocities, and ZDDP contents. An analysis of the research\nresults obtained permitted one to show how the ZDDP content in a\nblend with the base oil tested, angular velocity, and oil temperature\ncould affect charging in the interface system: Rotating Shaft-oil\nand oil-lip seal, as well as the whole oil film in between and both\nelectrical double layers (EDL) at the surfaces of the Shaft and of\nthe lip of a lip seal.
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tribocharging in a Rotating Shaft oil seal system and the effect of an external electric field
Journal of Electrostatics, 2005Co-Authors: Juliusz B Gajewski, Marek J GlogowskiAbstract:Abstract The results are shown of tests on the effect of an auxiliary external DC electric field on the braking torque of a Rotating Shaft. Experiments were carried out on a simplified model of an engine in whose interior a metal Shaft rotated with given angular velocities. The Shaft was lubricated with different oils producing an oil film between the Shaft's surface and a lip seal. The influence of different oil temperatures on the braking torque was also examined. The results are presented here for fresh Polish oil LOTOS 15W40 and a lip seal diameter of 88 mm. An increase in the negative DC voltage applied between the Shaft and stiffening ring of the lip seal caused a reduction in braking torque.
Marek Gawlinski - One of the best experts on this subject based on the ideXlab platform.
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zddp content in mineral and synthetic motor base oils and its effect on electrostatic and tribological phenomena in a Rotating Shaft oil lip seal system
Tribology International, 2010Co-Authors: Juliusz Gajewski, Kazimierz Gatne, Marek J Głogowski, Marek GawlinskiAbstract:Abstract The paper presents the results of experiments on electrostatic and tribological aspects of different ZDDP (zinc dialkyldithiophosphate) contents when ZDDP is added to different mineral and synthetic motor base oils. Experiments were carried out in a Rotating Shaft–oil–lip seal system which is an experimental facility in whose interior a metal Shaft rotated at given angular velocities, and where the level of tribocharging in the interfacial system was measured. The braking torque of a Shaft was also measured. The braking torque generally decreased when an external DC electric field was applied to the system.
Juliusz Gajewski - One of the best experts on this subject based on the ideXlab platform.
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zddp content in mineral and synthetic motor base oils and its effect on electrostatic and tribological phenomena in a Rotating Shaft oil lip seal system
Tribology International, 2010Co-Authors: Juliusz Gajewski, Kazimierz Gatne, Marek J Głogowski, Marek GawlinskiAbstract:Abstract The paper presents the results of experiments on electrostatic and tribological aspects of different ZDDP (zinc dialkyldithiophosphate) contents when ZDDP is added to different mineral and synthetic motor base oils. Experiments were carried out in a Rotating Shaft–oil–lip seal system which is an experimental facility in whose interior a metal Shaft rotated at given angular velocities, and where the level of tribocharging in the interfacial system was measured. The braking torque of a Shaft was also measured. The braking torque generally decreased when an external DC electric field was applied to the system.
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interpretation of the results of research on tribocharging in a Rotating Shaft oil lip seal system
Journal of Electrostatics, 2009Co-Authors: Juliusz Gajewski, Kazimierz GatneAbstract:Abstract A Rotating Shaft, rotary lip seal, and oil creating a film between the surfaces of a Shaft and of a lip of the seal sets up a system, which is relatively simple geometrically, but complex physically and electrochemically. Such a system is characteristic of all machinery, engines, etc. where Rotating parts and seals occur. In the experiments and tests performed to date different real commercial motor oils, original base oils, additives to base oils (antiwear and extreme pressure additives), lip seals, and Shafts with different roughness have been used for a range of oil temperatures and Shaft angular velocities. Tribocharging in the interfacial system: Rotating Shaft–oil–lip seal (the friction junction) is observed and analysed. Other experiments were performed to compensate for the electric field generated in the system applying an external DC electric field and to find its effect on friction and the braking torque of the Shaft. The results show that tribocharging can exert influence on the braking torque of a Rotating Shaft. The reduction of the braking torque under the action of an external DC electric field is also observed. The similar experiments are repeated with the use of pure base oils and additives including zinc dialkyldithiophosphate (ZDDP). Tribocharging is evident in the case of pure base oils and when these are blended with ZDDP. The external DC electric field also reduces the braking torque while applying the DC voltage to the system. Here the authors try to interpret the former and last research results in their physical aspect and to answer some questions.
Kazimierz Gatne - One of the best experts on this subject based on the ideXlab platform.
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zddp content in mineral and synthetic motor base oils and its effect on electrostatic and tribological phenomena in a Rotating Shaft oil lip seal system
Tribology International, 2010Co-Authors: Juliusz Gajewski, Kazimierz Gatne, Marek J Głogowski, Marek GawlinskiAbstract:Abstract The paper presents the results of experiments on electrostatic and tribological aspects of different ZDDP (zinc dialkyldithiophosphate) contents when ZDDP is added to different mineral and synthetic motor base oils. Experiments were carried out in a Rotating Shaft–oil–lip seal system which is an experimental facility in whose interior a metal Shaft rotated at given angular velocities, and where the level of tribocharging in the interfacial system was measured. The braking torque of a Shaft was also measured. The braking torque generally decreased when an external DC electric field was applied to the system.
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interpretation of the results of research on tribocharging in a Rotating Shaft oil lip seal system
Journal of Electrostatics, 2009Co-Authors: Juliusz Gajewski, Kazimierz GatneAbstract:Abstract A Rotating Shaft, rotary lip seal, and oil creating a film between the surfaces of a Shaft and of a lip of the seal sets up a system, which is relatively simple geometrically, but complex physically and electrochemically. Such a system is characteristic of all machinery, engines, etc. where Rotating parts and seals occur. In the experiments and tests performed to date different real commercial motor oils, original base oils, additives to base oils (antiwear and extreme pressure additives), lip seals, and Shafts with different roughness have been used for a range of oil temperatures and Shaft angular velocities. Tribocharging in the interfacial system: Rotating Shaft–oil–lip seal (the friction junction) is observed and analysed. Other experiments were performed to compensate for the electric field generated in the system applying an external DC electric field and to find its effect on friction and the braking torque of the Shaft. The results show that tribocharging can exert influence on the braking torque of a Rotating Shaft. The reduction of the braking torque under the action of an external DC electric field is also observed. The similar experiments are repeated with the use of pure base oils and additives including zinc dialkyldithiophosphate (ZDDP). Tribocharging is evident in the case of pure base oils and when these are blended with ZDDP. The external DC electric field also reduces the braking torque while applying the DC voltage to the system. Here the authors try to interpret the former and last research results in their physical aspect and to answer some questions.
Juliusz B Gajewski - One of the best experts on this subject based on the ideXlab platform.
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additives contents in pag and synthetic motor base oils and their effect on electrostatic phenomena in a Rotating Shaft oil lip seal system
IEEE Transactions on Dielectrics and Electrical Insulation, 2013Co-Authors: Juliusz B Gajewski, Marek J GlogowskiAbstract:The paper presents the results of experiments on the electrostatic aspects of anti-wear (AW) and friction modifier (FM) additives (agents) when these are added to PAG (polyalkylene glycol) and PAO 6 (synthetic) motor base oils to obtain their blends. Experiments are carried out in a Rotating Shaft-oil-lip seal system (a friction junction) which is a specially built experimental facility to be the simplified model of an engine crankcase in the interior of which an earthed metal Shaft rotates at given angular velocities from 500 up to 1000 rpm. The AW and FM additives contents in blends are 0.1 and 0.5 wt%. Oil temperature is controlled electronically and changed from 60 up to 110°C. An 88-mm diameter lip seal is used in the experiments. Electric potential of a stiffening ring of the lip seal tested is measured directly with an electrometer. The experimental results are the relationships of the potential induced in a stiffening ring to Shaft's angular velocity and to the temperature of pure base oils and their blends with AW and FM agents.
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tribocharging in a Rotating Shaft oil lip seal system for different engine base oils additive and their blends
Journal of Electrostatics, 2009Co-Authors: Juliusz B Gajewski, Marek J GlogowskiAbstract:Abstract The paper presents the results of experiments on tribocharging of different mineral, semisynthetic, and synthetic base oils and their blends with additives. An antiwear additive ZDDP (zinc dialkyldithiophosphate) is tested when added to base oils in different percentages by weight. Experiments are carried out on the specially built experimental facility to be a simplified model of an engine crankcase in whose interior an earthed metal Shaft rotates at given angular velocities. The potential of a stiffening ring of a lip seal is measured directly with an electrometer. The potential is a measure of tribocharging in a Rotating Shaft–oil–lip seal system, friction junction, and especially between both interfaces: Shaft surface–oil and oil–lip of a lip seal. The experimental results are presented in the form of some characteristics that are relationships of the potential induced in the stiffening ring with oil's temperature for different angular Shaft's velocities and additives, contents. The oil's temperature ranges from 60 to 110 °C and is controlled automatically. The angular velocities of a Shaft used are 500 and 1500 rpm. The additive contents in the blends with different base oils are 0.1 and 0.2%. The pure base oils of all the types and some lip seals are also examined. Moreover, the influence of an external DC electric field applied between the earthed Shaft and the stiffening ring on the braking torque of the Shaft is examined for a range of temperatures of the pure oils and their blends with the additive used, angular velocities, and additive contents. The electric field is produced while applying the high DC voltage of both polarities between the Shaft and the ring. The absolute value of the voltage is in a range from 500 to 1500 V.
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Effects of engine base oil type and ZDDP on the electrical double layer in the Rotating Shaft-oil-lip seal system with and without an external DC electric field
2008 IEEE International Conference on Dielectric Liquids ICDL 2008, 2008Co-Authors: Juliusz B Gajewski, Marek J GlogowskiAbstract:The paper presents the results of experiments on tribo-charging of\na blend of mineral base oil and different zinc dialkylditophosphate\n(ZDDP) contents. Experiments were carried out on the specially built\nexperimental facility to be a simplified model of an engine crankcase\nin whose interior an earthed metal Shaft rotated at given angular\nvelocities. The potential of a stiffening ring of a lip seal was\nmeasured directly with an electrometer. The experimental results\nare presented in the form of some characteristics that are relationships\nof the potential induced on the stiffening ring to the oil temperature\nfor different angular Shaft velocities and the ZDDP contents. Also\nthe effects of an external DC electric field on the braking torque\nof the steel Shaft were examined for a range of oil temperatures,\nangular velocities, and ZDDP contents. An analysis of the research\nresults obtained permitted one to show how the ZDDP content in a\nblend with the base oil tested, angular velocity, and oil temperature\ncould affect charging in the interface system: Rotating Shaft-oil\nand oil-lip seal, as well as the whole oil film in between and both\nelectrical double layers (EDL) at the surfaces of the Shaft and of\nthe lip of a lip seal.
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tribocharging in a Rotating Shaft oil seal system and the effect of an external electric field
Journal of Electrostatics, 2005Co-Authors: Juliusz B Gajewski, Marek J GlogowskiAbstract:Abstract The results are shown of tests on the effect of an auxiliary external DC electric field on the braking torque of a Rotating Shaft. Experiments were carried out on a simplified model of an engine in whose interior a metal Shaft rotated with given angular velocities. The Shaft was lubricated with different oils producing an oil film between the Shaft's surface and a lip seal. The influence of different oil temperatures on the braking torque was also examined. The results are presented here for fresh Polish oil LOTOS 15W40 and a lip seal diameter of 88 mm. An increase in the negative DC voltage applied between the Shaft and stiffening ring of the lip seal caused a reduction in braking torque.
