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Dynamic characteristics drive with frequency inverter
Loveček, Vladimír ; Marada, Tomáš (referee) ; Voldán, Jiří (advisor)
This bachelor thesis deals with a proposal of measurement equipment and software equipment for evaluation of the dynamic characteristics of the drive controlled by frequency inverter, and with subsequent measurement and evaluation. Torque measurements are made using the incremental encoder and evaluated on the basis of mechanical characteristics by development environment MATLAB.
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Motorcycle Dynamics Testing
Dolák, Jindřich ; Porteš, Petr (referee) ; Ramík, Pavel (advisor)
The contain of this work is to make suggestion of dynamic tests of motorbikes. I included my owns tests and results. I chose this theme because motorbikes are my hobby. I was really interested in these tests and what will the results turn out. The main part of this theme is to get the necessary values to compare dynamic parameters of motorbikes for braking and acceleration .
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Development and influence of the weight of cars and motorcycles
Valtrová, Martina ; Fojtášek, Jan (referee) ; Zháňal, Lubor (advisor)
This bachelor's thesis contains the description of the evolution of weight of automobiles and motorcycles. The first chapter contains a description of automobile dynamics and the influence of weight on dynamic properties of a vehicle. To describe the evolution of weight better, there are more detailed descriptions of weight evolutions of certain types of vehicles. The research of historical evolution and technology used today serves as the basis for the main outcome of this thesis, which is a prediction of the future development. This is the content of the last chapter.
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Basic measurement of dynamic properties of bipolar transistors
Repčík, Juraj ; Šteffan, Pavel (referee) ; Dřínovský, Jiří (advisor)
The aim of this bachelor thesis is to analyze theoretical basis of measurement bipolar transistors. First, this project focuses on the static parameters of a bipolar transistor, setting DC voltages and currents in an electric circuit (Q-point, operating point). Second it deals with measurement of selected dynamic properties of amplifier with bipolar transistor. Theoretical knowledge is presented on the practical circuit by a laboratory measurement of the selected properties. The measurement is automated using a computer with LabVIEW software. User programs are developed for measuring the V-A characteristics of a bipolar transistor and for measuring selected dynamic properties of the amplifier. The thesis points out a convenient approach in development of new software for automated measurement using graphical programming in LabVIEW.
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Verification of geometry influence on dynamic properties of immersed body
Černý, Tomáš ; Pochylý, František (referee) ; Habán, Vladimír (advisor)
Immersion of the body into the fluid creates additional effects which must be considered when designing the machines. Additional effects from the fluid influence the dynamic properties of the body. In this work the decrease of the natural frequency and the increase of the damping ratio during the gradual immersion of the body into the fluid are investigated. Diploma thesis is based on an experiment, which is performed on a series of flat strip steel components of various widths. The first three bending and first three torsion shapes of the free-hanging body are examined. Emphasis is placed on the influence of part width. In the next phase of the experiment, the influence of the proximity of the solid wall to the dynamic properties of the cantilever beam is examined. Further, the determination of the added density from the fluid is performed by modal analysis using the ANSYS software.
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Models of Dynamics and Responses of Multi-body Systems
Kšica, Filip ; Houfek, Lubomír (referee) ; Hadaš, Zdeněk (advisor)
The aim of this diploma thesis is to evaluate the potential of available methods for simplification and reduction of complex models of technical systems and their integration with experimental models. Finding methods, which would allow us to create models and run simulations in shorter periods of time, is key in design process of modern technical systems. In the beginning of this thesis, a theory necessary for understanding and application of presented methods is given. These methods can be separated into two groups, first as experiment related, second as simulation related. The first group contains methods for experimental evaluation of response and its use for dynamic system identification. The second group contains methods of finite element model creation, with the usage of standard structural elements as well as Component Mode Synthesis substructures, and these models are in the following step reduced into state space models. In the next step, all presented methods are applied on simple experimental structure. In conclusion, the results of simulations are the subject for comparison not only from quantitative point of view, but also, for the purpose of practical application, in terms of time, feasibility, versatility and accuracy. The system identification method along with state space method proved to be very suitable. The results presented in this thesis might help, by selecting the appropriate method, in simpler evaluation of dynamic properties of technical structures.
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Dynamic Behaviours of the C Axis Drive for Multifunction Cutting Center
Křepela, Jan ; Marek, Jiří (referee) ; Souček, Pavel (referee) ; Brychta, Zdeněk (referee) ; Singule, Vladislav (advisor)
his Disertation thesis involves the creating of the simulation model of the C axis drive over mentioned machine and them verification on the prototype of this machine. C axis is controlled with position feedback. Simulation model was created before the realisation of the machine prototype for the preliminary identification of the dynamic behaviours in the working cycles and them opportunity of the realisation this conception. C axis is constructed with worm gear and is controlled with help of Master-Slave drive. This torque drive eliminates the production backlash in the worm gear. The multifunction turning center, where is used this C axis, is determinate for heavy duty roughing cutting of the forged peaces, where is problem with dynamic stability of the cutting process. Simulation model includes the problems with multi-body mass system, friction on the worm gear, self locking, damping on the worm gear and the optimization of the parametrs for many regulators. Simulation model was verified on the prototype of the machine. Achieved results bring the new knowledge, which are used for simulation complicated machine nodes and this knowledge is used for research and developing of the similar mechatronics system.
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