|
|
Raking equipment of sedimentation tank
Šebela, Michal ; Mazal, Pavel (referee) ; Brandejs, Jan (advisor)
Bachelor's thesis contains summary of systems for raking equipment of sedimentation tank. It deals with a specific design solution raking device installed in sewage treatment plant in Ostrava. The goal of this thesis is design suitable solution of raking device. Thesis also contains drawing documentation.
|
|
|
Design and verification of station for calibration of AE sensors for bearing testing
Bančák, Matej ; Mazůrek, Ivan (referee) ; Mazal, Pavel (advisor)
The diploma thesis deals with calibration of AE sensors used in diagnostics of bearings. Two different conceptual solutions similar to those used in the diagnostics of bearings were designed in the design. Subsequently, the experimental device was designed for relative calibration using the rotation of bearings as a continuous AE source. The experimental part is oriented to the observation of the RMS parameter, which serves as a sensor sensitivity evaluation parameter. As sources of AE, bearings with a certain type of damage were used, which allowed for the formation of sensitivity characteristics according to the type of damage. Sensitivity characteristics of selected AE sensors have been developed to determine the effectiveness in relative calibration. The exponential sensitivity sensitivity of the MDK-13 sensors was observed on the software amplification of the AE analyzer. A proposal for the calibration method for MDK-13 type sensors was developed on the principle of comparison with the reference sensor.
|
|
|
Alternative energy supplies for garden and week-end house
Novák, Michal ; Mazal, Pavel (referee) ; Venclík, Jiří (advisor)
This bachelor’s thesis contains abstract of alternative energy supplies for garde nand week-end house and describes their advantages and disadvantages. The selected alternative energy supplies are: water-power, solar energy and wind energy. Final part of bachelor’s thesis discuss with a construction machinery for wind energy useage and describes parts of machinery.
|
|
|
APPLICATION OF ACOUSTIC EMISSION METHOD FOR MORE DETAILED DIAGNOSTICS OF RADIAL BEARINGS DAMAGE
Hort, Filip ; Pazdera, Luboš (referee) ; Hájek, Karel (referee) ; Samek,, Jiří (referee) ; Mazal, Pavel (advisor)
This thesis studies the possibilities of exploiting the acoustic emission method as a tool for more detailed identification of the radial bearings damage formation. The work includes comparison of different evaluation methods in laboratory tests. Applied couplant between the contact sensor areas and sensing surfaces is also taken into account. The practical part includes the presentation of the experimental station and structural adjustments made. The main part of the work comprises the examples in detail of three types of experimental tests that simulate the possible failure of bearings and their manifestation in the sensing signal. Testing methodology developed with recommended values for setting common AE signal measurement, vibration and temperature is a part of the thesis, too.
|
|
|
Suspended bicycle carrier for buses
Svoboda, Pavel ; Vlašic, František (referee) ; Mazal, Pavel (advisor)
This bachelor´s thesis describes the construction of universal the rack for bicycles to different types of buses. The aim was to produce a simple, lightweight, safe, affordable, accessible design of the rack for bicycles with easy the suspension, but also with the access to the engine compartment of the bus.
|
|
|
Acoustic emission signal classification at cyclic loading of parts
Stein, Pavel ; Mazůrek, Ivan (referee) ; Mazal, Pavel (advisor)
This master’s thesis is concerned analysis of signal of acoustic emission. The analysis is based on data of bearing material and real bearings testing, tested in the Axmat stands. The data was run by software Matlab and Python. Below I created plan for identification of damage stage depending on particular AE events. The results are put into diagram. Finally I’m trying to develop the new possibilities of using acoustic emission into practice on the real machines. There could be earlier prediction of a defect of monitored bearings compared to vibrating diagnostic used until now.
|
|
|
Design of the feeding mechanism for L profiles
Witos, Anton ; Vlašic, František (referee) ; Mazal, Pavel (advisor)
In this bachelor thesis was designed machine for feeding L profiles and end effector of service robot. Machine uses pneumatic piston to create frictional force between profile and feeding wheels. For movement of profile is used chain transmission which drive feeding wheels. End effector uses for work special type of electromagnet which uses electric voltage only for disabling. Thesis includes review of suggested solutions and choice of optimal solutions.
|
|
|
The device for measuring of camshafts timings
Jozíf, Lukáš ; Mazal, Pavel (referee) ; Mazůrek, Ivan (advisor)
Bachelor’s thesis is focused on constructional concept of device for measuring of camshafts timing and its wear-out. After short introduction and definitions of basic concepts there are problems of cams design analyzed and overview of the commercially offered devices is mentioned. Next part focuses on construction of the proper device including design documentation. Procedure of measuring with the device and example of some data evaluation is described. In the conclusion I evaluated constructional and economic aspect the whole concept.
|
|
|
Optimization of ultrasonic leak detector of pneumatic system
Macků, Ondřej ; Mazal, Pavel (referee) ; Vlašic, František (advisor)
The thesis deals with design and optimization of exchangeable modules for localization of air distributable ultrasound in concept of ultrasound probe design. Several series of these modules were manufactured using the technology of rapid prototyping and tested on artificially created source of air leak. Based on these verification experiments two types covering wide use for identification of pneumatic systems leaks were selected and modified. These two types are long range module for more accurate and expended reach of the leak detection and focusing attachment for narrowing the received range of scanning module and elimination of surrounding ultrasound. Part of the thesis is also analysis of the acoustic signal processed by modern acoustic emission analysers which allow besides standard parameters recording also continuous sampling up to 10 MHz and design solution for attachment of add-on modules to the detector. The thesis is beneficial for raising awareness of leak measurements, prototype manufacturing by using the 3D printing and designing and manufacturing of modules.
|
|
|
Diagnostics of rotating parts mounting systems in a wind turbine nacelle
Krontorád, Jakub ; Vlašic, František (referee) ; Mazal, Pavel (advisor)
The core aspect of thesis is management of work and diagnostics of wind turbines. It contains an overview of wind energy in Czech Republic and collects a relevant information from international papers and studies regarding the topic of diagnostics and maintenance of main mechanical components located in nacelle of wind turbine. It contains a recommendation for improvement of working conditions of wind turbines and their maintenance, which would lead to decrease of failure rates of the wind turbines main mechanical systems due to the utilization of acoustic emission and high frequency vibrations monitoring. Experimental part of the thesis contains analysis of acoustic emission signal from anonymous wind turbine with maximum energy output of 2000kW in Czech Republic to illustrate the sensitivity of acoustic emission and introduce its principles.
|
guest ::
