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Design and optimization of a frame for a machine tool
Weigl, František ; Marek, Jiří (referee) ; Hermanský, Dominik (advisor)
This diploma thesis deals with the optimization of the machine tool bed. In the first part of the thesis, individual machine tools and their distribution are briefly described. The following is a description of the influences that affect the static and dynamic properties of the bed, a brief overview of the materials used in the production of machine tools and a short overview of optimization methods. The second part of the work focuses on the creation of a model of the bed, which is used for mathematical optimization using FEM in the ANSYS Workbench. This serves to find the optimal input parameters of the bed, which will improve the static and dynamic properties of the bed. The optimization continues with changing the topology of the bed and using alternative materials. The result of this work is four optimized models, which are compared with the original configuration.
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Evaluation of the rail pad stiffness
Šardická, Klára ; Pazdera, Luboš (referee) ; Smutný, Jaroslav (advisor)
Rail pads are part of baseplate and baseplateless fastening system. It is a flexible element that is used primarily to reduce the negative effects of dynamic stress, reduce noise and vibration. This thesis deals with laboratory measurement of low-frequency dynamic stiffness at 5 Hz, static stiffness according to ČSN and static stiffness according to OTP of rail pads. The aim is to carry out and evaluate the measurements of samples supplied by different manufacturers and to compare them according to the variance of the resulting stiffnesses. Evaluate the stiffness of used rubber pads and compare with the results of new samples. Further, this thesis deals with the factors that the measurement itself and its results could influence.
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Evaluation of static stiffness measurements of rail pads
Toman, Radim ; Dubský, Vladimír (referee) ; Hruzíková, Miroslava (advisor)
Rail pads are a part of rail fastening and have an important role for track strain. The main observed characteristics are a static stiffness and a dynamic stiffness of rail pad. At the moment there are two standards for determining static stiffness - the national document General technical conditions (Obecné technické podmínky - OTP) and the european norm ČSN EN 13 146-9. However, the metodology of static stiffness measuring is different. It means different values of rail pads static stiffness. In the OTP there are required values of static stiffneses for baseplate and baseplateless rail fastening. These requirements can't be applied on the static stiffness set by ČSN EN due to different measurement methodology. The aim of this thesis is to measure static stiffness of rail pads according to both methodologies and to check relation between the methodologies. The thesis proceeds from requirements of Správa železniční dopravní cesty - the national organization.
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Evaluation of the rail pad stiffness
Šardická, Klára ; Pazdera, Luboš (referee) ; Smutný, Jaroslav (advisor)
Rail pads are part of baseplate and baseplateless fastening system. It is a flexible element that is used primarily to reduce the negative effects of dynamic stress, reduce noise and vibration. This thesis deals with laboratory measurement of low-frequency dynamic stiffness at 5 Hz, static stiffness according to ČSN and static stiffness according to OTP of rail pads. The aim is to carry out and evaluate the measurements of samples supplied by different manufacturers and to compare them according to the variance of the resulting stiffnesses. Evaluate the stiffness of used rubber pads and compare with the results of new samples. Further, this thesis deals with the factors that the measurement itself and its results could influence.
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Evaluation of static stiffness measurements of rail pads
Toman, Radim ; Dubský, Vladimír (referee) ; Hruzíková, Miroslava (advisor)
Rail pads are a part of rail fastening and have an important role for track strain. The main observed characteristics are a static stiffness and a dynamic stiffness of rail pad. At the moment there are two standards for determining static stiffness - the national document General technical conditions (Obecné technické podmínky - OTP) and the european norm ČSN EN 13 146-9. However, the metodology of static stiffness measuring is different. It means different values of rail pads static stiffness. In the OTP there are required values of static stiffneses for baseplate and baseplateless rail fastening. These requirements can't be applied on the static stiffness set by ČSN EN due to different measurement methodology. The aim of this thesis is to measure static stiffness of rail pads according to both methodologies and to check relation between the methodologies. The thesis proceeds from requirements of Správa železniční dopravní cesty - the national organization.
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