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Noise in the surrounding farms for fattening bulls.
KRAJÍČEK, Karel
This Bachelor Thesis studies the Noise Pollution Issue in the surrounding of a Bull Farm. In Theoretical Part there are explained the basic noise concepts, its circumscription, sources, effects on Human health and basic prevention and antinoise protective agents. There is a brief introduction of the examined Farm and Livestock as well. In Practical Part there are indicated measurement procedures, their subsequent evaluation and assessment according to relevant standards and regulations.
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Evaluation noise empty weight in running processing vegetables.
KALKUŠ, Václav
This Bachelor´s thesis paper describes the evaluation of machinery noise stress in vegetable manufacturing facilities. Furthermore it explains the construction characteristics and production technology in vegetable manufacturing. The aim of this paper is to meassure the levels of noise during all work processes in the shredding room. Moreover, the goal is to process the meassurements and analyze the minimums, maximums and equivalent noise levels, while using appropriate formulas. These calculations will be then compared with the current hygienic norms. In case, the meassurements exceed the norms, a corrective proposal will be suggested to improve the situation.
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The noise measurement
FLORIÁN, Václav
The thesis consists of 135 pages and the CD enclosure. Pictures, charts and colour graphs are included. The thesis and the CD enclosure contain data presented in charts and from the charts graphs have been made.
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Měření, analýza a zlepšení hlukových vlastností železničních dvojkolí
Boháč, T. ; Šeděnka, M. ; Smutný, J. ; Pazdera, L. ; Pešek, Luděk
Within the long-term development of railway wheels with vibration and noise absorbers manufactured in the Bonatrans Group a.s., their numerical modelling is in process as well as their dynamic and vibro-acoustic testing in laboratories and in operation. This article provides a brief description of the methodology of operational measurements of the railway wheels noise with and without absorbers including the results obtained on the basis of the analyses of the measurements in the underground in Boston and Prague and on the test ring of the reference track in Cerhenice. The effectiveness of the applied absorbers resulting in reduction of the noise of moving vehicles on various tracks during various travelling modes is evident from the results.
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Measurement and analysis of tram wheel vibration at riding on track
Pešek, Luděk ; Vaněk, František ; Cibulka, Jan ; Vaněk, P. ; Boháč, T.
In the contribution the design, realization and results of vibro-acoustic measurements on the riding tram wheel is presented. The operational tests were performed on the tram KT8D5 of DPMB Brno. The tram wheel with a special rubber padding design was equiped with add-on vibro-acoustic dampers. Efficiency of the add-on dampers was evaluated from comparison tests on the tram wheel with and without these dampers. Third octave and time-frequency analysis of the measured vibro signals is herein presented for a bow track passage. For analysis of operational vibration modes the FE model of the wheel with add-on dampers was developed and applied.
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Evaluation of vibrational eigenfrequencies and eigenmodes and loss factor for monoblock rail wheel
Pešek, Luděk ; Veselý, Jan
The aim of this research was evaluated experimentally eigenfrequencies, eigenmodes and loss factors for the monoblock rail wheel in two options: a) without acoustic damping disc, b) with acoustic damping disk. Excitation was realized by an electrodynamic vibrator with different levels of excitation and by hammer. The raill wheel was forced on a wheel set placed on a special frame. Frequency range of modal analysis was up to 6400Hz with step 0.25Hz. The measurement and analysis was performed for all identifiable eigenfrequencies with emphasis on eigenmodes having from two up seven node radials without node cirles. Pro determination of eigenfrequencies and loss factors corresponding eigenmodes the modal analysis was carried out for all options of the damping disk.
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