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Numerical simulation of of human voice propagation through the vocal tract and in the space around the body
Batelka, Jiří ; Hájek, Petr (referee) ; Švancara, Pavel (advisor)
This master's thesis handles description of the source-filter theory of voice production, anatomy of larynx, possible approaches to voice production modelling and selected works using these approaches in first chapter. Brief description of selected quantities used in acoustics and model creation follows. Models of only the head and head with female and male torso are created, including mesh testing to determine suitable element size. Models created in this thesis focus on description of voice propagation primarily in front of body and on influence of torso on sound propagation. Inclusion of torso results in fluctuations in frequency domain in range from 1 000 Hz to 8 000 Hz, more pronounced near lower frquencies. In transverse plane the presence of torso manifests in lower SPL in front of mouth and higher SPL on the sides for several frequencies. Regions with decrease of SPL in front of mouth are coindicent with frequencies, where higher SPL on sides in comparision with direction in front of the mouth is evident. These observations are in agreement with other works. No significant differences were observed between models with different torsos in the transverse plane. Below the transverse plane differences between models with different torsos can be observed, for example for some frequencies decrease in SPL isn't observed in front of mouth in directivity diagrams for model with male torso.
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Construction of demagnetizing device of MR dampers for Hyundai
Batelka, Jiří ; Kubík, Michal (referee) ; Strecker, Zbyněk (advisor)
The aim of this thesis in to find a suitable way of demagnetizing MR damper. To achieve this goal, a device based on Arduino DUE was assembled and the effects of adjustable parameters are examinated. Decrease of remanence from original 12 mT before demagnetizing to the resulting 0,23mT was reached. It is possible to use the found effects of adjustable parameters and the device to find suitable ways of demagnetizing other devices.
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Numerical simulation of of human voice propagation through the vocal tract and in the space around the body
Batelka, Jiří ; Hájek, Petr (referee) ; Švancara, Pavel (advisor)
This master's thesis handles description of the source-filter theory of voice production, anatomy of larynx, possible approaches to voice production modelling and selected works using these approaches in first chapter. Brief description of selected quantities used in acoustics and model creation follows. Models of only the head and head with female and male torso are created, including mesh testing to determine suitable element size. Models created in this thesis focus on description of voice propagation primarily in front of body and on influence of torso on sound propagation. Inclusion of torso results in fluctuations in frequency domain in range from 1 000 Hz to 8 000 Hz, more pronounced near lower frquencies. In transverse plane the presence of torso manifests in lower SPL in front of mouth and higher SPL on the sides for several frequencies. Regions with decrease of SPL in front of mouth are coindicent with frequencies, where higher SPL on sides in comparision with direction in front of the mouth is evident. These observations are in agreement with other works. No significant differences were observed between models with different torsos in the transverse plane. Below the transverse plane differences between models with different torsos can be observed, for example for some frequencies decrease in SPL isn't observed in front of mouth in directivity diagrams for model with male torso.
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Construction of demagnetizing device of MR dampers for Hyundai
Batelka, Jiří ; Kubík, Michal (referee) ; Strecker, Zbyněk (advisor)
The aim of this thesis in to find a suitable way of demagnetizing MR damper. To achieve this goal, a device based on Arduino DUE was assembled and the effects of adjustable parameters are examinated. Decrease of remanence from original 12 mT before demagnetizing to the resulting 0,23mT was reached. It is possible to use the found effects of adjustable parameters and the device to find suitable ways of demagnetizing other devices.
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