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Monitoring stress in the mast
Bednář, Tomáš ; Beneš, Petr (referee) ; Bejček, Ludvík (advisor)
The subject of this bachelor´s thesis is an issue of measurement and monitoring stressing in the mast – high voltage and very high voltage.The solution of query, including the producer and the users, is also presented. The aim of this thesis is to propose sensors for this measurement and making practical measurement of the concrete very high voltage mast.
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Assessment and evaluation of safety in power. machines
Hromek, Lukáš ; Janda, Marcel (referee) ; Veselka, František (advisor)
This thesis is focused on the security and improving of electrical rotating machines service life, especially asynchronous motors. Work includes a description of the most common disorders, short description of the asynchronous motor cage casting, analysis of provided decommissioned motors with photo documentation. The last part of this thesis is focused to vibrodiagnostic of asynchronous motor with simulated imbalance and motor emplacement by laser.
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Fibre optic vibration detection
Vlková, Monika ; Münster, Petr (referee) ; Dejdar, Petr (advisor)
The main focus of this bachelor thesis is the measurement of the polarization state during the manipulation of telecommunication infrastructure in order to secure the physical layer. The theoretical part is devoted to optical sensors. More specifically, optical vibration sensors working on the principle of several methods including OTDR, FBG, interferometry and polarization are discussed. The types of polarized light and possible methods of polarization are also described. The practical part of this thesis focuses on the measurement of the polarization state in an optical fiber. Measurements have been performed for a total of three different AD convertors. Using the measured data, the quality of the convertors was then compared and evaluated. The final output of this thesis is an annotated dataset for automatic event detection purposes.
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Assessment and evaluation of safety in power. machines
Hromek, Lukáš ; Janda, Marcel (referee) ; Veselka, František (advisor)
This thesis is focused on the security and improving of electrical rotating machines service life, especially asynchronous motors. Work includes a description of the most common disorders, short description of the asynchronous motor cage casting, analysis of provided decommissioned motors with photo documentation. The last part of this thesis is focused to vibrodiagnostic of asynchronous motor with simulated imbalance and motor emplacement by laser.
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Monitoring stress in the mast
Bednář, Tomáš ; Beneš, Petr (referee) ; Bejček, Ludvík (advisor)
The subject of this bachelor´s thesis is an issue of measurement and monitoring stressing in the mast – high voltage and very high voltage.The solution of query, including the producer and the users, is also presented. The aim of this thesis is to propose sensors for this measurement and making practical measurement of the concrete very high voltage mast.
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Assessment of the health hazard pertaining to the selected working conditions concerning manufacture of concrete-based products in the selected manufacturing plant
BRULÍK, Petr
In the working environment relating to the manufacture of concrete-based products there are many risk factors that may have a negative impact of the health condition of the employees. Among the most significant factors affecting the organism of every employee involved in the manufacture of concrete-based products there are in particular noise, physical strain, operating position and vibrations. Among these most significant factors, I have concentrated on noise and vibrations in the selected manufacturing plant as the plant was equipped with a new automatic machine where everything is controlled and performed by means of controls and where physical strain or unacceptable working conditions are nearly missing. In the theoretical part of the thesis, I focused on the assessment of health hazard and the relating aspects concerning noise and vibrations and the effect thereof on human organism. The goal of the thesis was to formulate a hypothesis concerning the area of assessment of health hazards pertaining to the selected factors present in the working environment closely related to the working conditions attributable to the manufacture of concrete-based products in the selected manufacturing plant. Three hypotheses were formulated, the assessment of health hazards pertaining to factors relating to the working conditions concerned was performed, the works were classified into the categories prescribed by the applicable legal regulations and the precautionary measures aiming at the protection of the employees at work were proposed. The thesis was based on the application of a qualitative survey, using in particular the secondary data analysis methodology compiling study of specialist information sources, the applicable laws and by-laws and relevant reports. The values obtained by measurement were processed and subsequently compared with the sanitary limits prescribed by the applicable legal regulations. The hypotheses have been proven due to this methodology and the goals have been achieved. It has been confirmed that values exceeding limits imposed by the applicable legal regulations are present in the manufacturing plant concerned. Noise seems to be a more significant risk factor than vibrations here and the proposed precautionary measures should eliminate damage to health of the employees due to the effect of the working conditions concerned. In practice, this thesis can serve for the purpose of improvement of awareness in the area of health hazard arising from working conditions pertaining to manufacture of concrete-based products and improvement of efficiency of the precautionary measures taken.
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