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Device for Measurement of MacPherson Strut Friction
Čapek, Štěpán ; Blaťák, Ondřej (referee) ; Hejtmánek, Petr (advisor)
This thesis focuses on the development of a device for measuring friction in a MacPherson strut. The thesis describes the mechanical friction that arises in the contacts of individual parts of the strut. It also includes a description of the MacPherson suspension and its comparison with other types of wheel suspensions, quantification of the forces acting on the strut during standard vehicle operation, and, last but not least, the design of a device for measuring increased friction in the strut when it is subjected to lateral force. The conclusion of the thesis describes the results of FEM (Finite Element Method) calculations of stress and deformation of the device, which verify the final design.
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Tractor Shift Mechanism Analysis
Netopil, Jan ; Řehák, Kamil (referee) ; Prokop, Aleš (advisor)
The thesis focuses on the shifting mechanisms of manually shifted tractor transmissions. It provides a comprehensive overview of all significant structural nodes of the shift mechanism with an analysis of the influence of the structure on the resulting intensity of a force required for shifting. The main aim of this thesis is the design and validation of experimental equipment for measuring the force effects of the shift mechanism of a mass-produced tractor in actual operation. The design of the experimental equipment is based on a study of the used measuring technique and similar experimental equipment. The final structure is selected based on selection by the method of weighted values, taking into consideration the requirements of the structure. A functional measuring chain is designed and formed for the realization of the measurement. To evaluate the data from the technical experiment, a multibody model of the designed experimental device is created in the MSC Adams View software, through which the real parameters of the shift mechanism are obtained from the measured values. The designed experimental equipment brings the possibility of complete analysis and subsequent optimization of the tractor's shift mechanism
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Mechanism Concept for the Exhaust Gas Flow Control at the Turbine Inlet
Závada, Otakar ; Kudláček, Petr (referee) ; Novotný, Pavel (advisor)
This diploma thesis is about design solution of new concepts cable of exhaust gas flow control at turbine inlet of turbochargers. Goals of this diploma thesis are to design and perform new concepts of exhaust gas flow control at turbine inlet of turbochargers. The first chapter of this diploma thesis is about search of existing mechanism designs and even mechanism designs that are not existing yet. In following chapters are introduced brand new and unique concept mechanism designs. The new concept designs are aiming on simplifying of whole mechanism and price reduction. The comparison and final evaluation are also based on result from multibody simulations. Based on criteria in this moment the best concept solution is the first own mechanism concept. In the conclusion are points needed for further improvement of own mechanism concepts.
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Variable turbocharger turbine geometry
Řezáč, Vojtěch ; Dlugoš, Jozef (referee) ; Drápal, Lubomír (advisor)
This thesis is dedicated to design of turbocharger’s boost pressure regulation using variable turbine geometry. In this thesis are mapped commonly used methods of turbine flow regulation. With respect to all information collected there were created new designs which were compared between each other and with currently used Garrett VNT system focusing on performance, flow area and operating forces which were obtained using advanced numerical methods in ADAMS View software. At the end of this thesis are presented benefits and drawbacks of each design. In the very end are presented next steps in further development.
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Powertrain Vibration Modelling using Virtual Prototypes
Prokop, Aleš ; Bauer, František (referee) ; Dundálek, Radim (referee) ; Novotný, Pavel (advisor)
This work deals with the matter of powertrain vibration reduction, focusing on the transmission. These units, depending on the purpose of utilization, consist of a high number of dimensionally complex components. These need to possess features, selected already in the design phase, which would guarantee smooth and quiet operation. A properly designed tooth profile and the related specified accuracy of manufacturing are one of the most important features. The basic function and the purpose of transmissions application indicate a relatively wide range of operating speeds and transmitted loads. Moreover, combination of both loading with improperly designed string’s parameter can cause a number of various problems. The vibration initiation with related noise from gear mesh belong to the most significant sources of issues. There are multiple mechanisms of oscillation initiation. Even when using the latest trends in the development of teeth, when their shape is upgraded and developed to meet specifically given load range, the above mentioned irregularity of transferred torque cannot be completely eliminated. Therefore, it is necessary, already in the design phase, to eliminate the transmission paths by which are vibrations transmitting to other components. People perceive this action in the form of vibration, noise, or temperature change in the surroundings. With the increasing comfort levels and number of produced vehicles the reduction of vibration and noise of machinery parts becomes stricter, including gears. The experimental approach is primarily used to assess the accuracy of designed gearboxes, but it is a very expensive and a time consuming method. Therefore, it is necessary to develop a process that utilizes both numerical simulation and experimental approach but also combines the advantages of both, particularly time and cost savings and comparability of results. For this purpose, the experimental gearbox is designed and manufactured including the single-stage gear enabling variable configurations in terms of the ratio change. The gearbox is subjected to numerical simulation of different complexity levels, as well as technical experiment. Furthermore, the universal virtual prototype in Multi-Body System ADAMS is created, which reflects the impact of several key parameters for proper functionality, such as axial distance, backlash, gear mesh stiffness, shaft mounting stiffness (bearings) and modal properties of the shafts and gearbox housing. Last but not least, the impact of imbalance or irregularity of input shaft speed is incorporated. The last part focuses on a brief description of the application of the presented methodology – modelling of vibrations on the tractor gearbox.
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Mechanism Concept for the Exhaust Gas Flow Control at the Turbine Inlet
Závada, Otakar ; Kudláček, Petr (referee) ; Novotný, Pavel (advisor)
This diploma thesis is about design solution of new concepts cable of exhaust gas flow control at turbine inlet of turbochargers. Goals of this diploma thesis are to design and perform new concepts of exhaust gas flow control at turbine inlet of turbochargers. The first chapter of this diploma thesis is about search of existing mechanism designs and even mechanism designs that are not existing yet. In following chapters are introduced brand new and unique concept mechanism designs. The new concept designs are aiming on simplifying of whole mechanism and price reduction. The comparison and final evaluation are also based on result from multibody simulations. Based on criteria in this moment the best concept solution is the first own mechanism concept. In the conclusion are points needed for further improvement of own mechanism concepts.
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Variable turbocharger turbine geometry
Řezáč, Vojtěch ; Dlugoš, Jozef (referee) ; Drápal, Lubomír (advisor)
This thesis is dedicated to design of turbocharger’s boost pressure regulation using variable turbine geometry. In this thesis are mapped commonly used methods of turbine flow regulation. With respect to all information collected there were created new designs which were compared between each other and with currently used Garrett VNT system focusing on performance, flow area and operating forces which were obtained using advanced numerical methods in ADAMS View software. At the end of this thesis are presented benefits and drawbacks of each design. In the very end are presented next steps in further development.
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Tractor Shift Mechanism Analysis
Netopil, Jan ; Řehák, Kamil (referee) ; Prokop, Aleš (advisor)
The thesis focuses on the shifting mechanisms of manually shifted tractor transmissions. It provides a comprehensive overview of all significant structural nodes of the shift mechanism with an analysis of the influence of the structure on the resulting intensity of a force required for shifting. The main aim of this thesis is the design and validation of experimental equipment for measuring the force effects of the shift mechanism of a mass-produced tractor in actual operation. The design of the experimental equipment is based on a study of the used measuring technique and similar experimental equipment. The final structure is selected based on selection by the method of weighted values, taking into consideration the requirements of the structure. A functional measuring chain is designed and formed for the realization of the measurement. To evaluate the data from the technical experiment, a multibody model of the designed experimental device is created in the MSC Adams View software, through which the real parameters of the shift mechanism are obtained from the measured values. The designed experimental equipment brings the possibility of complete analysis and subsequent optimization of the tractor's shift mechanism
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|
|
Powertrain Vibration Modelling using Virtual Prototypes
Prokop, Aleš ; Bauer, František (referee) ; Dundálek, Radim (referee) ; Novotný, Pavel (advisor)
This work deals with the matter of powertrain vibration reduction, focusing on the transmission. These units, depending on the purpose of utilization, consist of a high number of dimensionally complex components. These need to possess features, selected already in the design phase, which would guarantee smooth and quiet operation. A properly designed tooth profile and the related specified accuracy of manufacturing are one of the most important features. The basic function and the purpose of transmissions application indicate a relatively wide range of operating speeds and transmitted loads. Moreover, combination of both loading with improperly designed string’s parameter can cause a number of various problems. The vibration initiation with related noise from gear mesh belong to the most significant sources of issues. There are multiple mechanisms of oscillation initiation. Even when using the latest trends in the development of teeth, when their shape is upgraded and developed to meet specifically given load range, the above mentioned irregularity of transferred torque cannot be completely eliminated. Therefore, it is necessary, already in the design phase, to eliminate the transmission paths by which are vibrations transmitting to other components. People perceive this action in the form of vibration, noise, or temperature change in the surroundings. With the increasing comfort levels and number of produced vehicles the reduction of vibration and noise of machinery parts becomes stricter, including gears. The experimental approach is primarily used to assess the accuracy of designed gearboxes, but it is a very expensive and a time consuming method. Therefore, it is necessary to develop a process that utilizes both numerical simulation and experimental approach but also combines the advantages of both, particularly time and cost savings and comparability of results. For this purpose, the experimental gearbox is designed and manufactured including the single-stage gear enabling variable configurations in terms of the ratio change. The gearbox is subjected to numerical simulation of different complexity levels, as well as technical experiment. Furthermore, the universal virtual prototype in Multi-Body System ADAMS is created, which reflects the impact of several key parameters for proper functionality, such as axial distance, backlash, gear mesh stiffness, shaft mounting stiffness (bearings) and modal properties of the shafts and gearbox housing. Last but not least, the impact of imbalance or irregularity of input shaft speed is incorporated. The last part focuses on a brief description of the application of the presented methodology – modelling of vibrations on the tractor gearbox.
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