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Measurement of passive frequency crossovers for loudspeaker systems
Holínský, Jan ; Hanák, Pavel (referee) ; Balík, Miroslav (advisor)
The content of the master´s thesis is to approach the issue of measuring the characteristics of passive frequency crossover. The work describes individual types of measured characteristics and their possibility of measurement. Then the work describes design of modules for measurement characteristics of passive frequency crossover (shunt, resistive load and amplifier). These modules were made and tested for its functions. For the amplifier is then made a second design for fulfilment requirements. The second version isn’t made in this work. At the end of the work was prepared the theoretical part of the laboratory task: Measurement of characteristics of passive frequency crossover, including protocol.
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Analysis of the Parasitic Bonds in the RFI Filters
Pišťák, Ondřej ; Vyskočil, Pavel (referee) ; Dřínovský, Jiří (advisor)
These diploma thesis deals with analysis of parasitic elements of EMI filters. It is desirable that the attenuation characteristics can be predicted with the help of the known filter’s schematic even at higher frequencies, where the parasitic elements of the passive components have to be taken into account. The analysis also includes the creation of real circuitry of an EMI filter. The component values are estimated according to this basic model.
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Influence Of Piezoelectric Material Properties On Impedance Characteristic And Improvements Of Calibration Equipment
Krejčí, Jakub
This paper deals with finite element simulations of impedance characteristics piezoelecticelements utilized in sensors of acoustic emission (AE). Coefficients of piezoelectric material arechanged to evaluate the sensitivity to their variation in case they are not known precisely, so to whichextent can they influence the sensitivity of the sensor. Result showed sensitivity on coefficient inc-matrix, mainly to coefficients c11 and c13. Second investigated topic is issue with test stand for calibrationof AE sensors, where output of force sensor was affected by parasite signal. By contactlessmeasurement with laser interferometer was discovered the parasite signal is caused by mechanic ofthe system and it is no threat for the measuring chain.
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Simulations And Measurement Of Acoustic Emission Effects
Krejčí, Jakub
This paper deals with issue of method of acoustic emission and performed measurements of acoustic emission signals and simulation of this phenomenon. Main interest is given into measurement of acoustic emission transducer displacement to verify homogeneity on its surface in time and simulations by finite element method. Performed simulations deal with displacement calculation of calibration block after a capillary break, calculation of impedance characteristics of piezoelectric sensing element and their comparison with analytic solution or measurement.
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Measurement of passive frequency crossovers for loudspeaker systems
Holínský, Jan ; Hanák, Pavel (referee) ; Balík, Miroslav (advisor)
The content of the master´s thesis is to approach the issue of measuring the characteristics of passive frequency crossover. The work describes individual types of measured characteristics and their possibility of measurement. Then the work describes design of modules for measurement characteristics of passive frequency crossover (shunt, resistive load and amplifier). These modules were made and tested for its functions. For the amplifier is then made a second design for fulfilment requirements. The second version isn’t made in this work. At the end of the work was prepared the theoretical part of the laboratory task: Measurement of characteristics of passive frequency crossover, including protocol.
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