Selim A. Oleksowicz - Academia.edu (original) (raw)
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Papers by Selim A. Oleksowicz
The low-carbonization of vehicles requires use of the advanced combustion, propulsion and energy ... more The low-carbonization of vehicles requires use of the advanced combustion, propulsion and energy conversion/conservation technologies. This especially concerns the hybrid and electric vehicles (H/EVs), where the conventional systems (e.g. internal combustion engine, friction brakes) are combined with other systems (e.g. electric motor, batteries). Among those systems, the regenerative braking technology requires greater researchers’ effort, in order to prepare application ready, safe and efficient system, as it can significantly reduce the vehicle cost of operation. In order to maximize on regenerative braking energy for one axle regenerative braking vehicles the rethinking of the well established electronic brake-force distribution system (EBD) operation should be taken into account. The prioritization of the one axle share (axle with the regenerative braking capability) in the deceleration of the vehicle will significantly increase the restored energy level. Proposed idea has been...
Tribology Transactions, 2011
Surface Review and Letters, 2011
The paper presents the results of the investigation performed on a stand for model testing of the... more The paper presents the results of the investigation performed on a stand for model testing of the friction pair like a car disc brake. The tests were performed for the mating operation of a frictional node with the dosage of hard abrasive particles into the friction zone. Based on the observation of the phenomena in the friction zone and the analysis of the parameters describing operating conditions of a frictional node, physical models of the frictional node cooperation in the presence of hard abrasive particles have been proposed. During the tests, using the transparent material of a friction cover plate and a fast recording camera, a visual analysis of the material transfer in the friction zone was done. It allowed to positively verifying the proposed physical models of the frictional node cooperation in the presence of hard abrasive particles.
Vehicle System Dynamics, 2013
The sustainable development of vehicle propulsion systems that have mainly focused on reduction o... more The sustainable development of vehicle propulsion systems that have mainly focused on reduction of fuel consumption (i.e. CO2 emission) has led, not only to the development of systems connected with combustion processes but also to legislation and testing procedures. In recent years, the low carbon policy has made hybrid vehicles and fully electric vehicles (H/EVs) popular. The main virtue of these propulsion systems is their ability to restore some of the expended energy from kinetic movement, e.g. the braking process. Consequently new research and testing methods for H/EVs are currently being developed. This especially concerns the critical ‘use-cases’ for functionality tests within dynamic events for both virtual simulations, as well as real-time road tests. The use-case for conventional vehicles for numerical simulations and road tests are well established. However, the wide variety of tests and their great number (close to a thousand) creates a need for selection, in the first place, and the creation of critical use-cases suitable for testing H/EVs in both virtual and real-world environments. It is known that a marginal improvement in the regenerative braking ratio can significantly improve the vehicle range and, therefore, the economic cost of its operation. In modern vehicles, vehicle dynamics control systems play the principal role in safety, comfort and economic operation. Unfortunately, however, the existing standard road test scenarios are insufficient for H/EVs. Sector knowledge suggests that there are currently no agreed tests scenarios to fully investigate the effects of brake blending between conventional and regenerative braking as well as the regenerative braking interaction with active driving safety systems (ADSS). The paper presents seven manoeuvres, which are considered to be suitable and highly informative for the development and examination of H/EVs with regenerative braking capability. The critical manoeuvres presented are considered to be appropriate for examination of the regenerative braking mode according to ADSS. The manoeuvres are also important for investigation of regenerative braking system properties/functionalities that are specified by the legal requirements concerning H/EVs braking systems. The last part of this paper shows simulation results for one of the proposed manoeuvres that explicitly shows the usefulness of the manoeuvre.
International Journal of Automotive Technology, 2013
International Journal of Automotive Technology, 2013
Tribology Transactions
This paper presents a theoretical model for dry, low-velocity, and wear-less friction based on a ... more This paper presents a theoretical model for dry, low-velocity, and wear-less friction based on a single asperity interaction with arbitrary assumed adhesion forces and elastic deformations of the microasperities. The simulations of friction behaviour according to the single asperity interaction, as well as the interaction of multiplied single models have been presented. The multiplied model assumes; a regular distribution of the single asperities, arbitrarily chosen geometrical properties (based on harmonic function) and elasto-mechanical properties of the cooperating materials. In the proposed model, the adhesion as a function of asperity deformation has been introduced. This enables the simulation of an expedient local coefficient of friction. The model assumes no breaking of the contact between single asperities; however, the proposed model enables detection of such a situation. The results obtained by the simulation of the model show both qualitative and quantitative agreement w...
The low-carbonization of vehicles requires use of the advanced combustion, propulsion and energy ... more The low-carbonization of vehicles requires use of the advanced combustion, propulsion and energy conversion/conservation technologies. This especially concerns the hybrid and electric vehicles (H/EVs), where the conventional systems (e.g. internal combustion engine, friction brakes) are combined with other systems (e.g. electric motor, batteries). Among those systems, the regenerative braking technology requires greater researchers’ effort, in order to prepare application ready, safe and efficient system, as it can significantly reduce the vehicle cost of operation. In order to maximize on regenerative braking energy for one axle regenerative braking vehicles the rethinking of the well established electronic brake-force distribution system (EBD) operation should be taken into account. The prioritization of the one axle share (axle with the regenerative braking capability) in the deceleration of the vehicle will significantly increase the restored energy level. Proposed idea has been...
Tribology Transactions, 2011
Surface Review and Letters, 2011
The paper presents the results of the investigation performed on a stand for model testing of the... more The paper presents the results of the investigation performed on a stand for model testing of the friction pair like a car disc brake. The tests were performed for the mating operation of a frictional node with the dosage of hard abrasive particles into the friction zone. Based on the observation of the phenomena in the friction zone and the analysis of the parameters describing operating conditions of a frictional node, physical models of the frictional node cooperation in the presence of hard abrasive particles have been proposed. During the tests, using the transparent material of a friction cover plate and a fast recording camera, a visual analysis of the material transfer in the friction zone was done. It allowed to positively verifying the proposed physical models of the frictional node cooperation in the presence of hard abrasive particles.
Vehicle System Dynamics, 2013
The sustainable development of vehicle propulsion systems that have mainly focused on reduction o... more The sustainable development of vehicle propulsion systems that have mainly focused on reduction of fuel consumption (i.e. CO2 emission) has led, not only to the development of systems connected with combustion processes but also to legislation and testing procedures. In recent years, the low carbon policy has made hybrid vehicles and fully electric vehicles (H/EVs) popular. The main virtue of these propulsion systems is their ability to restore some of the expended energy from kinetic movement, e.g. the braking process. Consequently new research and testing methods for H/EVs are currently being developed. This especially concerns the critical ‘use-cases’ for functionality tests within dynamic events for both virtual simulations, as well as real-time road tests. The use-case for conventional vehicles for numerical simulations and road tests are well established. However, the wide variety of tests and their great number (close to a thousand) creates a need for selection, in the first place, and the creation of critical use-cases suitable for testing H/EVs in both virtual and real-world environments. It is known that a marginal improvement in the regenerative braking ratio can significantly improve the vehicle range and, therefore, the economic cost of its operation. In modern vehicles, vehicle dynamics control systems play the principal role in safety, comfort and economic operation. Unfortunately, however, the existing standard road test scenarios are insufficient for H/EVs. Sector knowledge suggests that there are currently no agreed tests scenarios to fully investigate the effects of brake blending between conventional and regenerative braking as well as the regenerative braking interaction with active driving safety systems (ADSS). The paper presents seven manoeuvres, which are considered to be suitable and highly informative for the development and examination of H/EVs with regenerative braking capability. The critical manoeuvres presented are considered to be appropriate for examination of the regenerative braking mode according to ADSS. The manoeuvres are also important for investigation of regenerative braking system properties/functionalities that are specified by the legal requirements concerning H/EVs braking systems. The last part of this paper shows simulation results for one of the proposed manoeuvres that explicitly shows the usefulness of the manoeuvre.
International Journal of Automotive Technology, 2013
International Journal of Automotive Technology, 2013
Tribology Transactions
This paper presents a theoretical model for dry, low-velocity, and wear-less friction based on a ... more This paper presents a theoretical model for dry, low-velocity, and wear-less friction based on a single asperity interaction with arbitrary assumed adhesion forces and elastic deformations of the microasperities. The simulations of friction behaviour according to the single asperity interaction, as well as the interaction of multiplied single models have been presented. The multiplied model assumes; a regular distribution of the single asperities, arbitrarily chosen geometrical properties (based on harmonic function) and elasto-mechanical properties of the cooperating materials. In the proposed model, the adhesion as a function of asperity deformation has been introduced. This enables the simulation of an expedient local coefficient of friction. The model assumes no breaking of the contact between single asperities; however, the proposed model enables detection of such a situation. The results obtained by the simulation of the model show both qualitative and quantitative agreement w...