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Design of workshop crane with powered chassis
Tmej, Tomáš ; Hadraba, Petr (referee) ; Kočiš, Petr (advisor)
This bachelor’s thesis focuses on design of workshop crane with powered chassis. The work describes available types of cranes and devoted to the category of workshop cranes in detail. Two construction designs of a workshop crane with powered chassis are elaborated. One option is selected. In this selected variant is made a detailed design, control calculations of the supporting parts and the production drawings are drawn at the end.
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Van der Pol oscillator analysis
Huf, Milan ; Hadraba, Petr (referee) ; Rubeš, Ondřej (advisor)
This thesis describes study of nonlinear systems, especially the Van der Pol oscillator. The theoretical part of this thesis is devoted to the basic theory of nonlinear oscillation. The aim of the practical part of this thesis is to describe the behaviour of the forced and unforced Van der Pol oscillator.
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Design of the dilatation pad for linear encoder
Moravanský, Richard ; Hadraba, Petr (referee) ; Štěpánek, Vojtěch (advisor)
The bachelor’s thesis deals with the issue of linear length sensors, their dividing, construction, temperature effects and design of an dilatation pad. The aim of the work is a professional search on the topic of linear length sensors, design of variants of the pad and the associated recommendation for practice. The chapter of current knowledge is dedicated to basic knowledge about position sensors, ie. converter sensor connection types. The following chapter is about the description of the basic parts of linear systems, specifically the method of drive and lead in linear systems. After clarifying the concepts, the chapter of linear length sensors will be explained. The chapter deals in more depth with position measurement in linear systems, photoelectric sensing, and a linear encoder from HEIDENHEIN. As the last part of the theory, the analysis of thermal effects is presented. The practical part describes the design of variants of dilatation pad and assembly of elements that allow expansion, their connection and clamping. In the final part, the best variant and recommendation for practice is suggested.
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Vibration of Production Machines
Hadraba, Petr ; Vetiška, Jan (referee) ; Hadaš, Zdeněk (advisor)
The vibration analysis of a production machine is a key factor of its functionality, service life and occupational safety. This work deals with mathematical dynamic modelling and its contribution to the improvement of a mechanical design and mechanism failure prevention. The whole process is presented on the example of a drum cam rotary indexing table and on the example of actuators of multi spindle automatic lathes. The analysis consisted of complex nonlinear models based on basic linear models. It was computed using Matlab, Simulink and MSC ADAMS. Models of these mechanisms were validated with experimental measurements. The results were used for mechanical design improvement and for speed control optimization.
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Experimentální určení tlumení nosníku
Fučík, Ondřej ; Hadraba, Petr (referee) ; Rubeš, Ondřej (advisor)
This bachelor thesis deals with structural damping of metallic materials. The first part is research of damping properties, ways how to discover damping properties and short description of how to simulate viscoelasticity of materials, using mathematical models. The second part is focused on an experiment with beams of different lengths and materials. Mathematical models making is also part of solution. The third, last part is focused on results processing. Using mathematical models, damping ratios of beams are determined.
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Spindles actuator of turning machines
Hadraba, Petr ; Vetiška, Jan (referee) ; Hadaš, Zdeněk (advisor)
This thesis deals with dynamic modelling of actuators of multispindle automatic lathes TMZ842NG and TMZ867NG in MSC Adams software. The main objective was to assess dif-ferences between the individual spindles actuator systems and the influence of shortening material on the system. This thesis deals with the possibilities of dynamic modelling in MSC Adams, mainly with the application of the Machinery module. The choice of the final model for main analysis is based on the model's assessment.
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Milling spindle thermal model
Chlapek, Ondřej ; Musil, Filip (referee) ; Hadraba, Petr (advisor)
The aim of this thesis is to create two thermal models (black box and grey box), which would allow to predict the development of the milling spindle temperature, based on measured operating data. The accuracy of both created models was determined by statistical methods, and the models were compared with each other.
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Analýza Duffingova oscilátoru
Sosna, Petr ; Hadraba, Petr (referee) ; Rubeš, Ondřej (advisor)
This thesis analyses the simplest model of nonlinear oscillations, the Duffing oscillator. Methods of nonlinear dynamics are used for analysis of the Duffing equation which describes such oscillations. Numerical solution focuses on the dynamics of twin-well potencial oscillations. The effect of all the parameters of the Duffing equation on the system is shown. Coexisting periodic and chaotic attractors are discussed as well as possible bifurcations of the system. A bifurcation diagram for a specific system is created. The thesis concludes with simulation of basins of attraction for different values of excitation force and frequency.
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Design of dynamic vibration absorber
Hilšer, Pavel ; Musil, Filip (referee) ; Hadraba, Petr (advisor)
Firs part of bachelor's thesis deals with vibrations, main quantities, damping and methods of solving dynamics models. In second part, description of tuned mass damper is carried out. Then tuned mass damper is designed using matlab, simulik for given entity. Values, calculated using this method are compared with finite element method. After that the entity is realized and measured using modal hammer and accelerometer. Calculated values are compared with values measured values.
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