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Dynamic characteristic of the workpiece in turning
Nádvorník, Vít ; Štetina, Jakub (referee) ; Fiala, Zdeněk (advisor)
The contens of master thesis is theoretical analysis of vibrations during turning and possibillity to eliminate them, measure dynamic compliance and modal paramteters. The goal of experimental part is to determine the effect of material and type of clamping for three shafts at natural frequency, mode shape and dynamic compliance. Using these results we can optimized cutting parameters and to better overcome vibration during machining.
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Analysis of the structure for the effects of earthquakes
Švejcar, Martin ; Martinásek, Josef (referee) ; Vlk, Zbyněk (advisor)
This master thesis deals with analysis of a selected construction subjected to a seismic load. In the Dlubal RFEM programme, a basic model was created and analyzed with the spectral analysis using response spectra and with the time analysis using accelerograms from the database of the programme. The outcomes from these analyses were compared. Subsequently, the same calculations were performed on modified models and the results of the internal forces and deformations of the structure were compared with the outputs obtained on the original basic model.
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Design of clamping fixture for ultrasonic welding of plastics
Vojteková, Lucia ; Kandus, Bohumil (referee) ; Kubíček, Jaroslav (advisor)
The project elaborated design of clamping fixture for ultrasonic welding – horn. In pursuance of literary studies and calculations there was created approximate shape of clamping fixture, which was created in 3D programme and tested by finite element analysis. Using the linear static analysis there were found some modal shapes of the horn. The purpose of simulations is to find modal shapes of analysed structure, which can cause damage of the horn or equipment. Analysis shows the real shape of vibrations of the tool, which can be always in one axis. With the help of correction of dimensions and shape there was found required frequency in working range of ultrasonic equipment. Suitable shape of the horn was processed into drawings. The material, from which is horn made of, is a titanium alloy TiAlMo74.
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Dynamic characteristic of the workpiece in turning
Nádvorník, Vít ; Štetina, Jakub (referee) ; Fiala, Zdeněk (advisor)
The contens of master thesis is theoretical analysis of vibrations during turning and possibillity to eliminate them, measure dynamic compliance and modal paramteters. The goal of experimental part is to determine the effect of material and type of clamping for three shafts at natural frequency, mode shape and dynamic compliance. Using these results we can optimized cutting parameters and to better overcome vibration during machining.
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