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Determination of the Material Acoustic Impedance
Vozárová, Juliana ; Řehák, Kamil (referee) ; Prokop, Aleš (advisor)
This diploma thesis deals with the determination of the material acoustic absorption in an impedance tube. The aim of the work is to propose a measuring experiment and to design measuring device with the intention of reducing costs. The aim is to carry out a measuring experiment on a manufactured measuring device. The results of the experiment are evaluated in terms of meeting the requirements formeasuring device. The results of the tested materials are compared with the values from the supplier.
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Duffing equation in mathematical modelling of non-linear oscillators
Vozárová, Juliana ; Štoudková Růžičková, Viera (referee) ; Šremr, Jiří (advisor)
The thesis deals with the behaviour of non-linear oscilators. Within their models there often appears the Duffing equation. The aims of this investigation include fundamentals of the theory of differential equations, interpretation of the Duffing equation and its analysis. To fulfill these aims, this investigation utilizes qualitative theory of the differential equations. It means that closed form solutions to the equations are not looked for but qualitative behaviour and properties of the solutions are studied. Some of the properties of solutions can be obtained from phase portraits.
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Determination of the Material Acoustic Impedance
Vozárová, Juliana ; Řehák, Kamil (referee) ; Prokop, Aleš (advisor)
This diploma thesis deals with the determination of the material acoustic absorption in an impedance tube. The aim of the work is to propose a measuring experiment and to design measuring device with the intention of reducing costs. The aim is to carry out a measuring experiment on a manufactured measuring device. The results of the experiment are evaluated in terms of meeting the requirements formeasuring device. The results of the tested materials are compared with the values from the supplier.
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|
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Duffing equation in mathematical modelling of non-linear oscillators
Vozárová, Juliana ; Štoudková Růžičková, Viera (referee) ; Šremr, Jiří (advisor)
The thesis deals with the behaviour of non-linear oscilators. Within their models there often appears the Duffing equation. The aims of this investigation include fundamentals of the theory of differential equations, interpretation of the Duffing equation and its analysis. To fulfill these aims, this investigation utilizes qualitative theory of the differential equations. It means that closed form solutions to the equations are not looked for but qualitative behaviour and properties of the solutions are studied. Some of the properties of solutions can be obtained from phase portraits.
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