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Mechanical analysis of the subsystem of the tower crane
Urbánek, Roman ; Venský, Jiří (referee) ; Fuis, Vladimír (advisor)
The bachelor thesis deals with the solution of a subsystem of a tower crane with a passive effect (NNTP). First part describes tower cranes and their parts. The following part is a description of the theoretical and physical laws of statics and dynamics. In the practical part, various states of motion of a specific modeled subsystem are calculated, which shows a trolley of the tower crane. The aim of the calculation of each configuration is to determine the numerical values of the contact forces in the links, to analyze the dynamic quantities and to evaluate the functionality of the links. Numerical values of unknown parameters were calculated by solving a system of linear equations in the calculation software Matlab.
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Empirical relationships for the assessment of the small punch test
Venský, Jiří ; Kubík, Petr (referee) ; Šebek, František (advisor)
This thesis aims at describing the small punch test, considering its limitations and its applications. Research of empirical equations, by which the value of yield stress and ultimate tensile stress is determined, was carried out. Furthermore, four calculation models were introduced. These models served to establish the yield stress of two materials using analytical solution based on Kirchhoff´s theory of plates. Calculated values of the yield stress were compared to the values obtained by the normalized tensile test. Calculated values were compared to the values of yield stress from the empirical equations found in literature as well. Yield stress values obtained by empirical relations were more accurate than those obtained from analytical solutions stated in this thesis.
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Mechanical analysis of the subsystem of the tower crane
Urbánek, Roman ; Venský, Jiří (referee) ; Fuis, Vladimír (advisor)
The bachelor thesis deals with the solution of a subsystem of a tower crane with a passive effect (NNTP). First part describes tower cranes and their parts. The following part is a description of the theoretical and physical laws of statics and dynamics. In the practical part, various states of motion of a specific modeled subsystem are calculated, which shows a trolley of the tower crane. The aim of the calculation of each configuration is to determine the numerical values of the contact forces in the links, to analyze the dynamic quantities and to evaluate the functionality of the links. Numerical values of unknown parameters were calculated by solving a system of linear equations in the calculation software Matlab.
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|
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Empirical relationships for the assessment of the small punch test
Venský, Jiří ; Kubík, Petr (referee) ; Šebek, František (advisor)
This thesis aims at describing the small punch test, considering its limitations and its applications. Research of empirical equations, by which the value of yield stress and ultimate tensile stress is determined, was carried out. Furthermore, four calculation models were introduced. These models served to establish the yield stress of two materials using analytical solution based on Kirchhoff´s theory of plates. Calculated values of the yield stress were compared to the values obtained by the normalized tensile test. Calculated values were compared to the values of yield stress from the empirical equations found in literature as well. Yield stress values obtained by empirical relations were more accurate than those obtained from analytical solutions stated in this thesis.
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