National Repository of Grey Literature 64 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
Measurement of weak magnetic field in 3D space
Bár, Martin ; Klusáček, Stanislav (referee) ; Havránek, Zdeněk (advisor)
The aim of this thesis is to theoretically examine the magnetic field of miniature cylindrical NdFeB magnets, compare the simulation results to real-world measurements, and design a magnetic field probe using suitable sensors. A FEM simulation was conducted using Ansys AIM and FEMM 4.2. The simulation shows that the magnetic induction on the surface of the magnet depends on the diameter/height ratio. The simulation results also show that 21 µm thick protective layer of Ni-Cu-Ni metal on the surface of NdFeB magnets lowers flux density of the smallest magnet sample (1x1 mm) by up to 14 %. It was also concluded that a larger magnet edge radius results in a higher flux density on the surface of the magnet. The biggest differences between simulation data and data measured by the F.W. BELL gaussmeter occurred in the smallest magnet sample. Using the FEMM 4.2 simulation software, a three-axis magnetic field probe was designed. Potential problems with this probe design have been identified. A simple procedure for probe calibration was proposed.
Laboratory demonstrator for vibrodiagnostics
Blecha, Martin ; Krejčí, Jakub (referee) ; Klusáček, Stanislav (advisor)
This thesis deals with a vibration diagnostics of objects, structures and machines. The theoretical part is divided into three chapters according to type of the measurement. The first part called Modal Analysis discusses the basis of vibration, methods of measurement, relevant technical equipment and principle of experimental modal analysis. The second and third chapters of the thesis are focused on the diagnosis of defects. Each chapter mentioned above describes diagnosed defects, used methods and procedure for the diagnosis. Another part of the thesis summarizes practical issues and results gained in the laboratory experiments. It begins with discovering parameters of the measured object using technical diagnostics – experimental modal analysis. In the next step the hardware concept design was created, including custom measuring application programmed in LabVIEW. One part of the design is the laboratory model which includes a structure for free mounting and a possibility of excitation by an electrodynamic exciter. The application is also modified to enable measurements with shaker excitation. Finally, applications cooperating with professional software ModalVIEW and BK Connect were developed in order to simplify the operation and increase the comfort.
Impact hammer calibration
Bilík, Šimon ; Klusáček, Stanislav (referee) ; Beneš, Petr (advisor)
The theoretical part of this thesis focus on the description of the piezoelectric accelerometers and their use for the impact measurements. It also characterizes the construction and the calibration process of the impact hammers with the use of the piezoelectric accelerometers. The practical part describes the place of calibration with the calibration tools, identifies the source of the oscillations on the output signal of the accelerometer and suggests its compensation. Part of the thesis is a service program for the impact measurement, analysis and the impact hammer calibration. Thesis also describes the methodology of the calibration and quantifies the measurement uncertainty.
Instrument driver for two-channel waveform generator Aim-TTi TG501xA series
Opravil, Michal ; Klusáček, Stanislav (referee) ; Čala, Martin (advisor)
The bachelor thesis deals with designing and describing of instrument driver for generator Aim-TTi TG501xA series in LabVIEW development environment. In the thesis is defined the structure and requirements for creating of instrument driver for Aim-TTi TG5012A generator. Therein are also mentioned the parameters and advantages of the generator. To meet the requirements for the instrument driver the functions were defined, thereby generator may be controlled over USB or LAN. The other supplied functions are determined to generate all available signals and set their parameters. The validity of parameters set are examined by the function for monitoring of set-up that reads the data from error register of the generator and verifies the correctness of the adjustment of parameters. All functions uses the NI VISA libraries containing the functions for communication and functions providing read and write support for the device. All created functions were tested on generator TG5012A communicating via USB and LAN. For better comprehension, there is a set of examples given demonstrating the involvement and applicability of each function.
MEMS microphones' parameters analysis
Halata, Roman ; Klusáček, Stanislav (referee) ; Havránek, Zdeněk (advisor)
This bachelor thesis deals with the types and properties of currently used MEMS microphones. This thesis is scoped to digitial MEMS microphones and their digital output. Thesis includes design and realization of workplace and evaluation of results of the measurements.
Car Fault Diagnostics
Potocký, Matej ; Klusáček, Stanislav (referee) ; Šedivá, Soňa (advisor)
This diploma work is targeting fault diagnostics of electronic systems and engines used in automobiles. Results and methods used to diagnose faults are analyzed within the work, using standard diagnostic methods and devices, results of which were captured measuring with multi-channel oscilloscope. Furthermore, suggestions of using methods optimized for cost and time difficulty factors are made.
Calibration of angular encoder
Šindelář, Michal ; Klusáček, Stanislav (referee) ; Beneš, Petr (advisor)
This master’s thesis deals with calibration of incremental encoders. Introduces basic principles and terms in the field of rotary encoders and its calibration. The first part describes angular displacement sensors. Especially it focuses on optoelectrical incremental encoders. It also includes market research of very high-accuracy encoders. The second part contains description of precision calibration techniques with uncertainty to the thousandth of an arc-sec level. In the last part, the development of a calibration stage is presented and consequently the error map of an encoder is obtained.
Qualitative comparison of MEMS vibration sensors
Hasík, Stanislav ; Havránek, Zdeněk (referee) ; Klusáček, Stanislav (advisor)
The aim of this bachelor thesis is a qualitative parameter validation of MEMS vibration sensors using calibration devices from the companies SPECTRA a Brüel & Kjr. First part of study deals with different types of MEMS vibration sensors on the piezoresistive, capacitive and thermal principle of operation. The study also deals with primary and secondary methods of calibration of vibration sensors and devices used for these calibration methods. The second part of the thesis is to use the calibration chains and secondary calibration methods to verify the sensitivity and temperature dependences of three particular MEMS accelerometers from the companies STMicroelectronic, MEMSIC and Panasonic. The measured characteristics are compared with catalog datasheets. In the end of the thesis are also discussed the possibility of the suppression these temperature effects.
Contactless measurement of operational deflection shape
Tomek, Tomáš ; Klusáček, Stanislav (referee) ; Beneš, Petr (advisor)
This bachelor's thesis provides an overview of 2D/3D laser scanners used in measuring operating deflection shapes. Describes the issue of measuring the operating deflection shapes and modal analysis. My work also contains a description of the measurement chain. From the contactless measurement of a vibrating surface using the application created in LabVIEW to its visualization in Pulse Reflex.
Modal Analysis
Zach, Martin ; Klusáček, Stanislav (referee) ; Beneš, Petr (advisor)
This bachelor's thesis solves questions of measuring of modal analysis and operational deflection shapes. It provides the summary of visualizations software to viewing of natural deflection shapes. In several chapters is described a way of measuring of modal analysis and operating instructions to measuring and visualization programme.

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