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Simulation of Noise Emitted by a Single-stage Gearbox
Motl, Daniel ; Hadaš, Zdeněk (referee) ; Lošák, Petr (advisor)
The level of noise and vibration of gearboxes is one of the most important parameters for today´s customers. This thesis deals with mathematical acoustic behavior modelling and its contribution to the gearbox design using finite element method. The process is presented at three computations models. Two of those were validated with experimental measurement. Acoustic analysis were performed with software FFT ACTRAN.
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Analysis of the ICT needs of the South Bohemian University Orchestra
SVITIČ, Daniel
The main topic of this bachelor thesis is to apply the company process management and effectivization on rehearsals of the South Bohemian University Orchestra. With the usage of time frames, my thesis aims to analyse the effectivity of time management during the rehearsals and subsequently to increase it with suggested improvements. The same process is used in the companies when achieving resource optimization. In my thesis I will examine the effect of such analysis on the rehearsals or on teaching. As the words like effectivization or optimization are commonly used especially in the business area these days it may be assumed that these approaches are to be used not only in business area but also in teaching sphere, as my thesis aims to substantiate. Apart from the objectives stated above, my thesis also provides the possible design and selection of the technical equipment which may be used when sounding the orchestra. The thesis also includes a stageplan, i.e. the document consisting of technical requirements for the concert. The stage plan may be used as a basis for external organizers and sound engineers.
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Design of wireless microphone
Vičíková, Kristýna ; Haltof, Vladimír (referee) ; Ondra, Martin (advisor)
The topic of this bachelor‘s thesis is design of wireless handheld microphone that transmits speech during presentations. Current design in this area is very uniform. The main goal of this thesis is to create unconventional design using nontraditional material from Matério for surface of the microphone. Important aspect at this type of product is ergonomy. Design aims to create option to change position of hand.
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Human hearing sensitivity assesment
Tinka, Dominik ; Sekora, Jiří (referee) ; Škutková, Helena (advisor)
Bachelor thesis aims to evaluate changes of sensitive human hearing through created mobile application. According to obtained teoretical knowledges mobile application provide audiometrical measurements. In connection with this is described adjustments of sound outcomes of mobile, which is set in pursuance of calibrate unit. In the next part is described methodics of measuring and processing measured data. Static evaluation is processed on collected measured data from one proband and group of probands. Measurements on one proband were repeated for couple of days. The end of this thesis discusses about obtained results, which challenges the hypothes about sensitivity of hearing.
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Sound
Kryl, Ivo ; Schneider, Jiří (referee) ; Tobola, Ondřej (advisor)
The main objective of this bachelor thesis is to achieve modernization of the appearance of the audio equipment manufacturer. Design should respect all structural, technological, functional and ergonomic patterns.
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Experimental Electro-Mechanical Musical String Instrument
Blasche, Ondřej ; Mojdl, Edgar (referee) ; Dlouhý, Dan (advisor)
The goal of this thesis is to design and build stringed mechanical electrphone with unusual sound characteristics. The end product is an instrument devided into three sections with specific options of sound creation, able to be both plucked and played with a bow. Thesis utilizes knowledge of electric guitar construction and their sound pickup methods. It also deals with experimentation in the field of strig instruments and their development.
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Noise Generated by Turbochargers of Internal Combustion Engines
Kříž, Radim ; Novotný, Pavel (referee) ; Doman, Jozef (advisor)
This bachelor thesis is focused on generated noise by turbochargers of internal combus-tion engines. First, construction of turbochargers is described. The next part deals with the term sound and after that the issue of the noise in turbochargers follows. Consequent there are characterized experimental and simulation methods for determining the noise. The last part is focused on design modifications of turbocharger’s parts. The goal of this thesis is make research about origin of the noise by turbocharger during working conditions and design modifications which affect the noise.
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Metodická příručka pro práci s audio analyzátorem Audio Precision
DOLEJŠÍ, Marek
This thesis is focused on the use of the Audio Precision audio analyzer, model APx515. The goal of this thesis is to educate the operator of the measuring instrument about its functions and features. Supporting chapters cover deeper understanding in the field of audio. This thesis was written on the request of the Department of Physics and Biophysics, the University of South Bohemia and shall be used as a methodological guide for working with this audio analyzer. The first part of this document will discuss the theory of audio analysis, and in the second section I will cover the practical usage of the instrument. In the theoretical part, there are various kinds of measurements and audio tests described. Special attention is devoted to commonly used units in audio engineering including their explanation. The next chapter, Acoustic, describes basic terms about sound from a physical and psychoacoustic point of view and also focuses on human hearing. The Chapter about Hi-Fi then describes issues relating to quality music reproduction. The practical part focuses on the use of the analyzer. Several kinds of connections for different tests are described. They are followed by measurement results of a sample of devices of different kinds: preamplifiers, power amplifiers, integrated amplifiers and DACs in consumer electronics.
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Vliv komunální techniky na životní prostředí
VOZÁBAL, Václav
This bachelor work is focused on communal technology from the perspective of its impact on environment and noise pollution. Communal technology is in this case understood as brush cutter, drum chipper and riding mower. The primary aim of this work is the practical measurement of the noise in different locations. In this bachelor work, I focused on the choice of stations, which were suitable for measuring of the noise and also for the measuring near the source of the noise. After the detailed measurement of the noise, I subsequently carried out the calculation of the equivalent level of the noise, the lowest and the highest acoustic pressure. All the data, which I gained, are transferred to graphs and tables. The final values are compared to hygienic limits of the sheltered exterior areas and evaluated according to the valid legislation.
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Nebezpečný hluk
Výzkumný ústav bezpečnosti práce, v. v. i.
Tato příručka má sloužit k vytvoření představy o škodlivosti nadměrného hluku. Hudební hluk škodí stejně jako jiný, ale je o to zákeřnější, že si to posluchači neuvědomují. Poslech hlasité hudby na diskotékách je stejně škodlivý jako velká hlasitost ve sluchátkách walkmanu, diskmanu nebo přehrávače MP3. V jednotlivých kapitolách je možné se seznámit s tím, jak vzniká zvuk, jaké hladiny jsou již nebezpečné a co je možné dělat ve stavebních konstrukcích proti průniku hluku.
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