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Design of planar electromagnetic generator for sea drifter
Almáši, Matej ; Rubeš, Ondřej (referee) ; Hadaš, Zdeněk (advisor)
Unfixed buoys are an important part of sea and sea current monitoring. It is important that these buoys display a great amount of self-sufficiency. Electronic components of the buoy are conventionally powered by batteries, however there is an attempt to replace them with more self-sufficient sources that utilize energy from sea waves. For this purpose, so called “energy harvesters” that utilize electro-mechanic conversion are being developed. This thesis is focused on raising the power output of an energy harvester that is currently being developed at the FME BUT by finding the ideal parameters of the generating coil. An electro-mechanic model was developed which was then utilized to perform a sensitivity analysis. The result of the analysis was a set of coil parameters that resulted in the greatest power output. Subsequently, a coil prototype was manufactured, and the power output was measured experimentally. The root mean square value of the generated power was PRMS = 152.7 µW, which less than expected by the used model, however the coil winding didn’t fill up the space dedicated to it to the expected degree.
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Redesign of mechatronic system for presentation of damped oscillation
Hanuška, Rostislav ; Březina, Lukáš (referee) ; Hadaš, Zdeněk (advisor)
This thesis deals with mechatronic system design intended for demonstration of oscillation with electromagnetic damping for the purpose of its practical use in classes. A part of this thesis is also introduction to issues related to solids vibration and damping. Then a simulation model will be created in MATLAB/Simulink where required parameters of the damper will be selected, and also there is a design of the whole system. Finally, a comparison of response to initial deflection to real fabricated construction.
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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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Mechatronic system for presentation of damped oscillation
Sirota, Tomáš ; Březina, Lukáš (referee) ; Hadaš, Zdeněk (advisor)
This work is aimed to creating a system for presentation of oscilations. The main part consist of electromagnetic damper, which properties are suitable for use in this system. In the first part are some conditions for design of damper body . In he second part are selected next parameters for electromagnetic damper and of the whole system by MATLAB / Simulink with iterative method. In last part is whole system analyzed and the results indicate next changes in the structure of the system.
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Equivalent electromechanical circuits for modelling of dynamic systems
Legerský, František Jozef ; Rubeš, Ondřej (referee) ; Hadaš, Zdeněk (advisor)
This thesis deals with solving and modelling of dynamical systems using electromechanical analogy. A review of the use of electromechanical analogy of systems is made. Then a mechanical model of a piezoelectric beam is described by using differential equations and subsequently an equivalent circuit is made by using a voltage analogy, in which the power is simulated. A mechanical model and its equivalent circuit are made for the electromagnetic vibration generator using current analogy. The last part of the work is the modelling of complex piezoelectric and electromagnetic models and the influence of body weights on the vibrations.
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Modelling and Verification of Piezoelectric Generator
Lán, Radek ; Singule, Vladislav (referee) ; Hadaš, Zdeněk (advisor)
This master's thesis deals with the development and verification of the model of the piezoelectric generator, incl. determination of its parameters. This mathematical model should be used as a tool for development of new devices, especially for analysis of applicability of available energy source (vibration) and for design of device itself. At first the review of energy harvesting is described deeply. Subsequently piezoelectric generators and the ways how we can model them, are depicted in details. The methodology of parameters estimation and model development is presented in state space or in MATLAB/Simulink environment and applied on the commercial generator Midé V21BL. A device has been made within the scope of the thesis, which can be used as an universal tool in experiments with generator. Finally the model is applied on the analysis of energy yield from man's walk and there is also brief introduction to model modifications.
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