|
|
Test Planning Tool Extension for Distributed Systems
Mészáros, Filip ; Ráb, Jaroslav (referee) ; Ščuglík, František (advisor)
This bachelor thesis is about automatical software testing using the testing scheduler. It describes creation of the extension for the existing testing scheduler, so it will be possible to split effectively a group of tests to segments, that will be executed independently on each other. Tests are splitted according to the common characteristics of the enviroment, that need to be prepared for each test, and according to the dependencies between the tests. Furthermore, it describes what optimizations are used for splitting of the tests to subsets. Each subset of the tests runs on a standalone testing system, so the time needed for succesful completion of testing with the given set of tests is reduced. Created tool is succesfully used during everyday testing of the several products in the Acision company, to which was this tool made.
|
|
|
Design of gear coupling
Kundýsek, Michal ; Prokop, Aleš (referee) ; Řehák, Kamil (advisor)
The content of the diploma thesis is the construction of a toothed coupling for general use. The coupling was first described in order to acquaint the reader with the issue of the coupling. After approaching the issue, a practical part was created, which dealt with the conceptual design of the gear coupling. Two gear coupling designs have been developed to take into account as many customer requirements as possible. After making the model, strength calculations were created to verify the functionality of the coupling. The calculations mainly concerned important components for the operation of the clutch.
|
|
|
Strain-stress analysis of gear coupling
Vondra, Róbert ; Prokop, Aleš (referee) ; Řehák, Kamil (advisor)
This thesis deals with the contact analysis study of crown gear couplings during the simulation of its working conditions. The toothed coupling transmits high torque, even when the input and output shafts are misaligned due to outside tooth shape. For this reason, it is necessary to design the gear shape correctly. The inherent use of toothed couplings results in a wide range of working speeds and load transfers. This can cause several problems, if the parameters are selected incorrectly. Among the most significant of these is the generation of vibrations during gear engagement, accompanied by noise and the excessive loading of components, such as shafts and bearings. It is not possible to completely reduce uneven running, even with knowledge of the latest trends in the field of gear development. For this reason, it is necessary to eliminate the paths where the vibrations can propagate during the design itself. Inefficient and costly experiments are often used to determine the correct shape of gear teeth. For this purpose, a computational approach to describe a contact pressure on the teeth of couplings at different misalignment and loads is proposed. The model helps to understand the composition of the contact pressure during the working mode of misalignment and its behaviour within the rotation of the gear coupling. The introductory part of thesis presents the current state of knowledge of gear couplings and a description of load distribution issues, regarding the angular misalignment, torque and friction. In the following chapter, three possible approaches to the problem are described - analytical, experimental and computational. The following work offers the introduction and creation of two different computational models, varying in different tooth shape on the hub and the sleeve. Each geometry was subjected to a different load moment, a misalignment of the hub, or the rotation of the gear coupling as a whole. The main monitored parameter was the course of contact pressure in each step, when changing the degree of misalignment or the rotation of the model. Finally, three main sets of contact pressure on the teeth are presented, in connection with the reduced pressure plotted on the toothed rings. There is derivation of results and mutual comparison of each load case. The computation approach in FEM program Ansys Workbench was used to solve the problem.
|
|
|
Deformation analysis of the bearing of the main shaft of the wind power plant
Doležel, Miroslav ; Pokorný, Jan (referee) ; Vosynek, Petr (advisor)
This work studies a load distribution in spherical roller bearings of a main shaft in a wind power plant. The effect of the shaft and bearing houses as flexible bodies is considered for a particular geometry. The data are collected and processed by numerical computational modelling using the finite element method. Several complexity levels of models are studied. These analyses are also compared with the data obtained from the software Mesys. The results show that an inclusion of a flexible bearing housing has the greatest effect on the load distribution in the internal geometry of the bearing. The load distribution is also dependent on the direction of the radial load force. The most complex models are dependent on the friction coefficient in the internal bearing geometry, thus revealing the problem of interactions among the bearings. Knowledge of the load distribution contributes to the design of more reliable rolling bearings.
|
|
|
Design of gear coupling
Kundýsek, Michal ; Prokop, Aleš (referee) ; Řehák, Kamil (advisor)
The content of the diploma thesis is the construction of a toothed coupling for general use. The coupling was first described in order to acquaint the reader with the issue of the coupling. After approaching the issue, a practical part was created, which dealt with the conceptual design of the gear coupling. Two gear coupling designs have been developed to take into account as many customer requirements as possible. After making the model, strength calculations were created to verify the functionality of the coupling. The calculations mainly concerned important components for the operation of the clutch.
|
|
|
Strain-stress analysis of gear coupling
Vondra, Róbert ; Prokop, Aleš (referee) ; Řehák, Kamil (advisor)
This thesis deals with the contact analysis study of crown gear couplings during the simulation of its working conditions. The toothed coupling transmits high torque, even when the input and output shafts are misaligned due to outside tooth shape. For this reason, it is necessary to design the gear shape correctly. The inherent use of toothed couplings results in a wide range of working speeds and load transfers. This can cause several problems, if the parameters are selected incorrectly. Among the most significant of these is the generation of vibrations during gear engagement, accompanied by noise and the excessive loading of components, such as shafts and bearings. It is not possible to completely reduce uneven running, even with knowledge of the latest trends in the field of gear development. For this reason, it is necessary to eliminate the paths where the vibrations can propagate during the design itself. Inefficient and costly experiments are often used to determine the correct shape of gear teeth. For this purpose, a computational approach to describe a contact pressure on the teeth of couplings at different misalignment and loads is proposed. The model helps to understand the composition of the contact pressure during the working mode of misalignment and its behaviour within the rotation of the gear coupling. The introductory part of thesis presents the current state of knowledge of gear couplings and a description of load distribution issues, regarding the angular misalignment, torque and friction. In the following chapter, three possible approaches to the problem are described - analytical, experimental and computational. The following work offers the introduction and creation of two different computational models, varying in different tooth shape on the hub and the sleeve. Each geometry was subjected to a different load moment, a misalignment of the hub, or the rotation of the gear coupling as a whole. The main monitored parameter was the course of contact pressure in each step, when changing the degree of misalignment or the rotation of the model. Finally, three main sets of contact pressure on the teeth are presented, in connection with the reduced pressure plotted on the toothed rings. There is derivation of results and mutual comparison of each load case. The computation approach in FEM program Ansys Workbench was used to solve the problem.
|
|
|
Test Planning Tool Extension for Distributed Systems
Mészáros, Filip ; Ráb, Jaroslav (referee) ; Ščuglík, František (advisor)
This bachelor thesis is about automatical software testing using the testing scheduler. It describes creation of the extension for the existing testing scheduler, so it will be possible to split effectively a group of tests to segments, that will be executed independently on each other. Tests are splitted according to the common characteristics of the enviroment, that need to be prepared for each test, and according to the dependencies between the tests. Furthermore, it describes what optimizations are used for splitting of the tests to subsets. Each subset of the tests runs on a standalone testing system, so the time needed for succesful completion of testing with the given set of tests is reduced. Created tool is succesfully used during everyday testing of the several products in the Acision company, to which was this tool made.
|
guest ::
