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    Coupled Numerical Model of Vibration-Based Harvester
    (MDPI, 2020-04-15) Zukal, Jiří; Fiala, Pavel; Szabó, Zoltán; Dědková, Jarmila; Pernica, Roman
    Herein, the authors publish the complex design of a numerical coupled model of a vibration-based harvester that transforms mechanical vibrations into electric energy. A numerical model is based on usage of the finite element method, connecting analysis of the damped mechanical oscillation, electromagnetic field and electrical circuit. The model was demonstrated on the design of a microgenerator (MG), and then experimentally tested. The numerical model allows us to execute optimization of the design with many degrees of freedom. The transformation of the wave spreading in the form of mechanical vibrations was solved in the area of resonance of the electromechanical system.
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    The Evaluation of Noise Spectroscopy Tests
    (MDPI, 2016-12-10) Fiala, Pavel; Drexler, Petr; Nešpor, Dušan; Szabó, Zoltán; Mikulka, Jan; Polívka, Jiří
    The paper discusses mathematical tools to evaluate novel noise spectroscopy based analysis and describes, via physical similarity, the mathematical models expressing the quantitative character of the modeled task. Using the Stefan–Boltzmann law, the authors indicate finding the spectral density of the radiated power of a hemisphere, and, for the selected frequency interval and temperature, they compare the simplified models with the expression of noise spectral density according to the Johnson–Nyquist formula or Nyquist’s expression of the function of spectral density based on a derivation of Planck’s law. The related measurements and evaluations, together with analyses of the noise spectroscopy of periodic resonant structures, are also outlined in the given context.