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Papers by Peter Radziszewski
Journal of Mechanical Design
This paper studies the influence of macrogeometry and material type of spur gears on their torque... more This paper studies the influence of macrogeometry and material type of spur gears on their torque capacity, reliability, and acquisition cost. The developed model indicates how costly it is to enhance the torque capacity or the reliability of gears. The results are in agreement with the catalog prices of a manufacturer in a wide size range and different modules. The model provides a simple cost estimation tool for multi-objective gear design and optimization.
Journal of Renewable and Sustainable Energy
ABSTRACT The effect of buoyancy-driven natural convection on the performance of ground-coupled he... more ABSTRACT The effect of buoyancy-driven natural convection on the performance of ground-coupled heat exchangers of closed loop geothermal systems is investigated. The governing equations of continuity, momentum, and energy balance are derived, taking into account a porous ground medium fully saturated with liquid water. Boussinesq approximation is used to model the effect of buoyancy forces in water. A three-dimensional finite-volume discretization method over a structured mesh is used to solve the governing equations numerically. The performance of the ground-coupled heat exchanger system is assessed based on the rate of energy extraction and the outlet fluid temperature. The effects of hydraulic conductivity of the heat exchange medium and seasonal variations of heat load on the heat transfer phenomenon are studied. The results are evaluated by comparing them against the results of existing conduction-based heat transfer models. The influence of natural convection on the sustainable rate of heat extraction from a geothermal resource is underlined and interpreted.
Proceedings of the Canadian Engineering Education Association
It is a truism that if humanity wants to expand its horizons to Moon and other planets the area o... more It is a truism that if humanity wants to expand its horizons to Moon and other planets the area of mining in space has to go along. In the present paper a brief review of literature in terms of different mine unit operations is undertaken. The present paper gives a quick outlook as to where we stand in terms of technologies, which can be applied to space mining applicaions
Proceedings of the Canadian Engineering Education Association
In the mineral processing industry, tumbling mills are used in the size reduction or comminution ... more In the mineral processing industry, tumbling mills are used in the size reduction or comminution of ore to a target size distribution. As the tumbling mill environment is quite violent it is difficult to monitor mill charge motion. One way is to develop an “on-the-shell” acoustic system. This system will be used in the determination of the charge toe angle of an operating tumbling mill. The instrument, microphone system with the appropriate data acquisition system, collects the acoustic data. An analysis of the signal determines the location of the toe. The results of this development along with some trial data are presented.
Proceedings of the Canadian Engineering Education Association
In the mineral processing industry, tumbling mills are used in the size reduction or comminution ... more In the mineral processing industry, tumbling mills are used in the size reduction or comminution of ore to a target size distribution. The tumbling mill environment is characterised by frequent and violent interactions all of which are associated with wear either of the steel media or the mill liners. Liner profiles are monitor periodically using manual measurements. In this paper, the design and development of a liner wear sensor is investigated. The thin-film sensor operates within a mill, measuring liner wear while protecting the shell. Also, it is designed to avoid failure modes due to the operating environment. A prototype sensor was built and tested in dry and wet laboratory conditions. The results of the grind test show the feasibility of using the sensor in an industrial machine.
Proceedings of the Canadian Engineering Education Association
In the mineral processing industry, tumbling mills are used in the size reduction or comminution ... more In the mineral processing industry, tumbling mills are used in the size reduction or comminution of ore to a target size distribution. As the tumbling mill environment is quite violent it is difficult to monitor mill charge motion let alone single ball or particle motion. An effort was initiated to investigate the development of an instrumented ball that includes data collection capabilities. A variety of sensors, including accelerometers and gyros, form the instrument package. The data collected by the instruments allow the calculation of a number of dynamic and kinematic quantities as a function of time. Using instrumented ball data, the error model of the instrument can be found. Finally, the importance of the data with respect to ball mills is discussed along with the relationship between the instrumented ball data and charge motion simulation results is discussed.
Proceedings of the Canadian Engineering Education Association
The paper describes the main design decisions made in the design and development of an electric s... more The paper describes the main design decisions made in the design and development of an electric snowmobile for use in sensitive extreme environments. The instrumented snowmobile will serve as a test bed for vehicle performance monitoring under different conditions (cold and colder). Performance data gathered will be used to develop and validate power train models for this class of vehicles. The current configuration illustrates performance capabilities needed to satisfy light utility applications. Future effort will address the evolution to hybrid electric power train.
Proceedings of the Canadian Engineering Education Association
Total steel media wear in a given mill (ball or SAG) grinding process is a product of three recog... more Total steel media wear in a given mill (ball or SAG) grinding process is a product of three recognized wear mechanisms-impact, abrasion, and corrosion of which the contribution of each wear mechanism to total media wear has not been well established. A total media wear model can be defined on the assumption that the effect of each wear mechanism can be independently determined and this effect can be tied to mill charge motion as determined or estimated using a charge motion simulator, which allows for a total media wear model to be defined as the summation of the wear results of each mechanism. This necessitates the need for developing impact, abrasion and corrosion wear testers that will allow the study of media wear over a wide range of energy levels. Refinement of the impact test will allow studying how impact media wear at high energies behaves as a function of those energies. This work is focused on design and development of a high-energy impact wear tester. A comprehensive ill...
Minerals Engineering, 2016
Minerals Engineering, Oct 1, 2009
This paper presents an application of the Internal Model Controller (IMC) to the heat exchange in... more This paper presents an application of the Internal Model Controller (IMC) to the heat exchange in a dryer section of paper product industry. A quantitative discussion on numerical control of multivariable systems with use of reference-models is presented: the IMC design and application to multivariable systems are illustrated. The application of the IMC to a dryer section is studied, and some simulation test results are presented and discussed in the numerical control manner. The state model for the drying paper is based on the balance equations written for the steam, the paper, the wall of cylindrical heater, and the moisture. A methodology in developing the dynamic model is presented. 1. Controller design In previous articles [15, 16], the method Internal Model Controller (IMC) has been largely explained. Here is presented the essential calculation of this method. A general diagram of control structure is illustrated in figure 1. All the models are in state-space form. The process...
Journal of Mechanical Design
This paper studies the influence of macrogeometry and material type of spur gears on their torque... more This paper studies the influence of macrogeometry and material type of spur gears on their torque capacity, reliability, and acquisition cost. The developed model indicates how costly it is to enhance the torque capacity or the reliability of gears. The results are in agreement with the catalog prices of a manufacturer in a wide size range and different modules. The model provides a simple cost estimation tool for multi-objective gear design and optimization.
Journal of Renewable and Sustainable Energy
ABSTRACT The effect of buoyancy-driven natural convection on the performance of ground-coupled he... more ABSTRACT The effect of buoyancy-driven natural convection on the performance of ground-coupled heat exchangers of closed loop geothermal systems is investigated. The governing equations of continuity, momentum, and energy balance are derived, taking into account a porous ground medium fully saturated with liquid water. Boussinesq approximation is used to model the effect of buoyancy forces in water. A three-dimensional finite-volume discretization method over a structured mesh is used to solve the governing equations numerically. The performance of the ground-coupled heat exchanger system is assessed based on the rate of energy extraction and the outlet fluid temperature. The effects of hydraulic conductivity of the heat exchange medium and seasonal variations of heat load on the heat transfer phenomenon are studied. The results are evaluated by comparing them against the results of existing conduction-based heat transfer models. The influence of natural convection on the sustainable rate of heat extraction from a geothermal resource is underlined and interpreted.
Proceedings of the Canadian Engineering Education Association
It is a truism that if humanity wants to expand its horizons to Moon and other planets the area o... more It is a truism that if humanity wants to expand its horizons to Moon and other planets the area of mining in space has to go along. In the present paper a brief review of literature in terms of different mine unit operations is undertaken. The present paper gives a quick outlook as to where we stand in terms of technologies, which can be applied to space mining applicaions
Proceedings of the Canadian Engineering Education Association
In the mineral processing industry, tumbling mills are used in the size reduction or comminution ... more In the mineral processing industry, tumbling mills are used in the size reduction or comminution of ore to a target size distribution. As the tumbling mill environment is quite violent it is difficult to monitor mill charge motion. One way is to develop an “on-the-shell” acoustic system. This system will be used in the determination of the charge toe angle of an operating tumbling mill. The instrument, microphone system with the appropriate data acquisition system, collects the acoustic data. An analysis of the signal determines the location of the toe. The results of this development along with some trial data are presented.
Proceedings of the Canadian Engineering Education Association
In the mineral processing industry, tumbling mills are used in the size reduction or comminution ... more In the mineral processing industry, tumbling mills are used in the size reduction or comminution of ore to a target size distribution. The tumbling mill environment is characterised by frequent and violent interactions all of which are associated with wear either of the steel media or the mill liners. Liner profiles are monitor periodically using manual measurements. In this paper, the design and development of a liner wear sensor is investigated. The thin-film sensor operates within a mill, measuring liner wear while protecting the shell. Also, it is designed to avoid failure modes due to the operating environment. A prototype sensor was built and tested in dry and wet laboratory conditions. The results of the grind test show the feasibility of using the sensor in an industrial machine.
Proceedings of the Canadian Engineering Education Association
In the mineral processing industry, tumbling mills are used in the size reduction or comminution ... more In the mineral processing industry, tumbling mills are used in the size reduction or comminution of ore to a target size distribution. As the tumbling mill environment is quite violent it is difficult to monitor mill charge motion let alone single ball or particle motion. An effort was initiated to investigate the development of an instrumented ball that includes data collection capabilities. A variety of sensors, including accelerometers and gyros, form the instrument package. The data collected by the instruments allow the calculation of a number of dynamic and kinematic quantities as a function of time. Using instrumented ball data, the error model of the instrument can be found. Finally, the importance of the data with respect to ball mills is discussed along with the relationship between the instrumented ball data and charge motion simulation results is discussed.
Proceedings of the Canadian Engineering Education Association
The paper describes the main design decisions made in the design and development of an electric s... more The paper describes the main design decisions made in the design and development of an electric snowmobile for use in sensitive extreme environments. The instrumented snowmobile will serve as a test bed for vehicle performance monitoring under different conditions (cold and colder). Performance data gathered will be used to develop and validate power train models for this class of vehicles. The current configuration illustrates performance capabilities needed to satisfy light utility applications. Future effort will address the evolution to hybrid electric power train.
Proceedings of the Canadian Engineering Education Association
Total steel media wear in a given mill (ball or SAG) grinding process is a product of three recog... more Total steel media wear in a given mill (ball or SAG) grinding process is a product of three recognized wear mechanisms-impact, abrasion, and corrosion of which the contribution of each wear mechanism to total media wear has not been well established. A total media wear model can be defined on the assumption that the effect of each wear mechanism can be independently determined and this effect can be tied to mill charge motion as determined or estimated using a charge motion simulator, which allows for a total media wear model to be defined as the summation of the wear results of each mechanism. This necessitates the need for developing impact, abrasion and corrosion wear testers that will allow the study of media wear over a wide range of energy levels. Refinement of the impact test will allow studying how impact media wear at high energies behaves as a function of those energies. This work is focused on design and development of a high-energy impact wear tester. A comprehensive ill...
Minerals Engineering, 2016
Minerals Engineering, Oct 1, 2009
This paper presents an application of the Internal Model Controller (IMC) to the heat exchange in... more This paper presents an application of the Internal Model Controller (IMC) to the heat exchange in a dryer section of paper product industry. A quantitative discussion on numerical control of multivariable systems with use of reference-models is presented: the IMC design and application to multivariable systems are illustrated. The application of the IMC to a dryer section is studied, and some simulation test results are presented and discussed in the numerical control manner. The state model for the drying paper is based on the balance equations written for the steam, the paper, the wall of cylindrical heater, and the moisture. A methodology in developing the dynamic model is presented. 1. Controller design In previous articles [15, 16], the method Internal Model Controller (IMC) has been largely explained. Here is presented the essential calculation of this method. A general diagram of control structure is illustrated in figure 1. All the models are in state-space form. The process...