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Design and production of pendulum tuned mass damper
Čupr, Michal ; Rubeš, Ondřej (referee) ; Kšica, Filip (advisor)
In a real environment, various external conditions can cause vibration of the machines, buildings or other systems. To prevent vibration of the system with low frequencies, pendulum tuned mass damper can be installed. The first part of this thesis describes the oscillation of simple structures for systems with one or two degrees of freedom. This analysis is then applied to mechanism that contains pendulum tuned mass damper. The damper’s principle is explained along with its important parameters and properties. Design and tuning of the damper are explained. Text continues with description of several types of the damper and there are mentioned some examples of their applications. In the final part, a model of the mechanism with pendulum tuned mass damper is designed and it is described mathematically using programs Matlab and Ansys. Subsequently, the model was made and the real model was compared with mathematical model. It was found that effectiveness of the damper depends most on the natural frequency of the system and the dissipation energy from it. The manufactured pendulum damper effectively dampens the oscillation of the real model, and the course of its oscillations corresponds to the mathematical model.
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Modal properties tuning analysis of a dynamic system with piezoelectric components
Skřivánek, Vladimír ; Sosna, Petr (referee) ; Rubeš, Ondřej (advisor)
In this diploma thesis, the possibilities of tuning the modal properties of a simple dynamical system using piezoelectric components are investigated. In the first part, the methods of passive, semi-active and active shunt damping are discussed. The second part is devoted to simulations of different techniques and shunt variants. From the results of these simulations, a particular shunt is selected and subsequently constructed. The conclusion of this work is an experiment with the constructed shunt on a real dynamic system. The obtained measurement data are finally compared with the outputs of the simulations.
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Home weather station with web interface
Spratek, Vojtěch ; Bajer, Jan (referee) ; Rubeš, Ondřej (advisor)
The aim of this bachelor thesis is to create a wireless weather station. It consists of an ESP32 development board, a rechargeable circuit with a solar panel, sensors for measuring temperature, pressure, humidity, volatile organic compounds and nitrogen oxides. The measured data is stored in both Google Sheets and microSD card. Both current values of the measured quantities and long-term trends are displayed in a web application.
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Vibration energy harvester influence on vibration base
Nagy, Andrej ; Bajer, Jan (referee) ; Rubeš, Ondřej (advisor)
The goal of this thesis is to describe the impact of the energy harvester on the vibrating base, while also showing the basic aspects of energy harvesting. We first describe the issue on the research side, where we explain the concept and real use of energy harvesters, we show their basic construction with pictures of models and graphs from experiments showing their behavior. We also show how energy harvesters can be optimized and improved. At the end of the research part, we describe how the energy harvester can influence the deviation of the base, and therefore why it is important to model the system with a feedback impact on the base. In the practical part, we derive a mathematical model using Lagrange equations of the second kind, which we subsequently use for numerical and analytical solutions. In the final part of the work, we analyze the influence of individual parameters of the energy harvester on the output power and base deviation with the help of Matlab and Simulink.
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Hybrid Energy Harvesting Device
Rasocha, David ; Rubeš, Ondřej (referee) ; Hadaš, Zdeněk (advisor)
This bachelor theasis is focuses on the design of a hybrid piezoelectric vibratory genera-tor. The main idea is to place a permanent magnet on the end of the piezoelectric beam and to place the coil appropriately in order to make a electromagnetic generator. The coil will generate a electrical voltage on load, when the magnetic field is passing throught coil. The piezoelectric beam will also generate voltage, depending on its deformation. For modeling, Femm, Matlab and Simulink will be used.
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Magnetic Energy Harvesting Device for Low Excitation Vibration
Szabó, Hugo ; Singule, Vladislav (referee) ; Rubeš, Ondřej (advisor)
This bachelor theasis is focused on a concept of a magnetic energy harvesting device for low exitation frequencies. The device is made out of mechanical and electrical part where mechanical part is made out of two levitating magnets that repent each other and an electrical part is made out of magnetic circuit and a coil whose relative motion induces voltage in the coil. Mathematical model is made in Matlab, Simulink and FEMM. Construction model is made in Inventor.
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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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Trackside vibration energy harvester
Beňo, Martin ; Sosna, Petr (referee) ; Rubeš, Ondřej (advisor)
This diploma thesis is about the design of a vibrating energy harvester for a railway track. The railways are constantly being innovated and require a large number of sensors to achieve a high level of security and predictive maintenance. Such sensors need to be powered by a certain power source. A conventional energy source could be replaced by a vibrating energy harvester. The work discusses not only the analysis of suitable parameters, but also the realization of the energy harvester. At the end of the work, a functional concept is presented and the proven results are also taken into account.
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