Browsing by Author "Eichler Jakub"
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- ItemApplication of Preisach Model to Low Loss Ferromagnetic Materials(Institute of Measurement Science, Slovak Academy of Sciences, 2015-01-01) Eichler Jakub; Košek Miloslav; Novák Miroslav
- ItemComputation Speed of Numeric Preisach Model(2017-01-01) Eichler Jakub; Novák Miroslav; Košek Miloslav
- ItemDifferences between Preisach Model and Experiment for Soft Ferromagnetic Materials, Effect of Instrument Accuracy(Mondragon Unibertsitateko Zerbitzu Editoriala Loramendi kalea,, 2017-01-01) Eichler Jakub; Novák Miroslav; Košek MiloslavThe practical use of Preisach hysteresis model is based on proper identification of weighting function that characterizes the material. Obtaining of the weighting function needs two partial derivations of two-dimensional flux density function, called Everett surface, measured by specific procedure. Since the derivatives require exact measurements, the possible source of errors are studied. Main method is to compare experimental results and simulation. The comparison showed that the excitation current source accuracy influences the quality of Everett surface. Also the numeric integration drift plays an important role. The random or systematic failure in excitation current results in the minor secondary loops on the main hysteresis loop. Simulations of these effects confirmed the predicitons. As practical output it was found that the errors in excitation can be reduced by repeated measurements. The drift can be eliminated, if a more suitable wavefrom is used.
- ItemDifficulty in identification of Preisach hysteresis model weighting function using first order reversal curves method in soft magnetic materials(Elsevier BV, 2017-01-01) Eichler Jakub; Novák Miroslav; Košek MiloslavThe Preisach model can be used for detailed analysis of devices based on ferromagnetic materials, if its parameter, its weighting function, is well-known. Usually the weighting function is approximated by analytical formula. The second approach is to determine it directly from experimental data. Most widely used method to obtain the weighting function is the first order reversal curve method that is based on two partial derivatives of measured magnetization using a special excitation pattern beginning from deep material saturation. Since the derivative enhances the experimental error, a precision experiment is necessary. Furthermore, it is not easy to achieve the deep saturation with the required signal pattern. Therefore sophisticated data processing followed, in order to reduce experimental errors before performing the numerical derivative. The paper concerns measurements errors caused by insufficient saturation and also problems of negative values of the weighting function, partially due to the noise. Irrespective of measurement errors, the agreement between model and experiment is good and fully acceptable in technical praxis.
- ItemEffective Approximation of Transfer Characteristics of Low Frequency Amplifier(University of West Bohemia, 2014-01-01) Novák Miroslav; Košek Miloslav; Eichler Jakub
- ItemExperimental Determination of the Preisach Model for Grain Oriented Steel(POLISH ACAD SCIENCES INST PHYSICS, 2019-01-01) Eichler Jakub; Novák Miroslav; Košek Miloslav
- ItemExperimental-numerical method for identification of weighting function in Preisach model for ferromagnetic materials(Západočeská univerzita v Plzni, 2016-01-01) Eichler Jakub; Novák Miroslav; Košek Miloslav
- ItemFeasibilities of foam-forming bacteria disintegration by ultrasonic atomization(Technical University of Liberec, 2021-01-01) Schovanec Petr; Jašíková Darina; Kotek Michal; Havlíček Karel; Eichler Jakub
- ItemImplementation of Preisach model of Hysteresis in Matlab(Univeristy of Chemistry and Technology, 2015-01-01) Eichler Jakub; Novák Miroslav; Košek Miloslav
- ItemImplementation of the first order reversal curve method for identification of weight function in Preisach model for ferromagnetics(Institute of Electrical and Electronics Engineers Inc., 2016-01-01) Eichler Jakub; Novák Miroslav; Košek Miloslav
- ItemImprovements of Preisach model for soft magnetic materials, analysis of input excitation signal(2017-01-01) Eichler Jakub; Novák Miroslav; Košek MiloslavDetermination of the weighting function of the Preisach hysteresis model depends strongly on the quality of experimental data. The paper focuses on errors in the input excitation current. The analysis of experimental data and their processing were identified the main source of errors: RF noise, quantization noise at signal synthesis, power net interference and short-term faults of used power supply. Their reduction is possible by insertion of the filter in between the power source and measured sample. The filter was designed with respect to main frequencies of both the useful and disturbing signal. Its simulations are validated with measurements and the improvement of measured waveforms in the time domain is demonstrated.
- ItemImprovements of Preisach Model for Soft Magnetic Materials, Experiments on Filtering of Input Excitation Signal(2017-01-01) Eichler Jakub; Novák Miroslav; Košek MiloslavIdentification of Preisach model supposes a perfect experiment. One condition is that prescribed harmonic current without any errors flows in the toroid primary winding. The condition can be ensured by a suitable filter that was designed after the complete analysis of sources of signal errors. The filter was analysed by the use of circuit theory and a very simple experiment was realized for its measurement. Good agreement between experiment and simulation was found and small deviations explained. The filter significantly reduces all the errors in primary part of apparatus and improves the Preisach model simulation results.
- ItemMagnetic Barkhausen noise spectral emission of grain oriented steel under ultra low frequency magnetization(Institute of Electrical and Electronics Engineers Inc., 2019-01-01) Novák Miroslav; Eichler Jakub
- ItemMagnetic damper and stopper of door systems(2020-01-01) Valtera Jan; Eichler Jakub; Žabka Petr
- ItemMagnetic damper and stopper of door systems - report of the subproject for the year 2020(2020-01-01) Valtera Jan; Žabka Petr; Eichler Jakub
- ItemMagnetic damper and stopper of door systems – Final report(2021-01-01) Valtera Jan; Žabka Petr; Eichler Jakub
- ItemMagnetic stopper and damper for door systems(2021-01-01) Valtera Jan; Žabka Petr; Eichler Jakub
- ItemMagnetic viscosity measurement on grain oriented steel(Institute of Electrical and Electronics Engineers Inc., 2019-01-01) Košek Miloslav; Novák Miroslav; Eichler Jakub
- ItemModeling of lithium-ion battery charging and discharging using the preisach hysteresis model(Technical University of Košice, 2019-01-01) Eichler Jakub; Novák Miroslav
- ItemNon-equidistant Grid in Preisach Model(HUMUSOFT s.r.o., 2017-01-01) Eichler Jakub; Novák Miroslav; Košek Miloslav