National Repository of Grey Literature 31 records found  1 - 10nextend  jump to record: Search took 0.01 seconds. 
Automatic Modal Hammer
Bomský, Michael ; Čala, Martin (referee) ; Beneš, Petr (advisor)
The aim of this work is to design and then construct a solution to automate an impact hammer, which is used for vibration (modal) analysis of various mechanical parts. It is almost impossible with the hammer to achieve the same place of impact, speed and power when used manuály. With automatization of this process it is possible to achieve precise and repeatable results.
Simulator of vibration signals from gears
Macháček, Lukáš ; Pikula, Stanislav (referee) ; Čala, Martin (advisor)
This bachelor thesis deals with modelling the response of gears. The main content is a library in LabVIEW, which allows you to generate vibration signals from gears. The first part lists the types of gears and failures on them. The second part describes the models used for the mathematical description of vibration signals. The model Sine modelling of gear vibration signals was used to process this thesis. The output simulator should be a signal that is usually the result of synchronous signal filtering. The created library can generate a corresponding response from the specified parameters and structures of the model, but also obtain an estimate of the coefficients from this response with knowledge of the structure. The final part of the thesis is devoted to the described of the implemented library in LabVIEW.
Implementation of measures of time-frequency representations in LabVIEW
Franta, Filip ; Čala, Martin (referee) ; Pikula, Stanislav (advisor)
Realisation of a LabVIEW library calculating time-frequency representations quality measures is proposed. The library is tested on signals available in LabVIEW and in source documentations and results are compared.
Visualization unit for pressure sensors
Pasch, Boris ; Kunz, Jan (referee) ; Čala, Martin (advisor)
This bachelor thesis has a goal of designing and implementing displaying unit for TPMS sensors which are usually used for checking tire pressure in passenger cars. This unit can receive data from sensors, display them and send them to a web page for remote viewing. Unit will be used for monitoring pressure in pneumatic expanding shafts on rewinding and cutting machines.
Simulation tool for fixed-point arithmetic
Grézl, Vojtěch ; Kunz, Jan (referee) ; Čala, Martin (advisor)
This bachelor's thesis is focused on creating tool for simulating calculations with fixed point. This tool simplifies and increases the efficiency of performing operations with values of different data types. By calculating and graphically displaying absolute errors, which creates a conversion of values between data types and conversion through maximum absolute errors, the user can evaluate whether this conversion is optimal or not. After getting acquainted with this issue in the theoretical introduction part, the design of the practical part follows, which summarizes the implementation and procedure of program design in the LabVIEW 2021. Process of draft of the practical part is based on attributes of LabVIEW and it’s part FPGA module and aim on creating of transparent and user-friendly user interface. The output of the practical part is a tool that works with the created VI, containing a sequence of different operations with different input and output data types. The program is used to convert numbers of different data types to another type, mainly for a conversion to a fixed point data type. The user gives the main direction by creating a sample VI, the operations of which will then be performed. Other parameters that the user can set and affect the program are listed on the user interface.
Measuring the Sun's position
Bajer, Patrik ; Čala, Martin (referee) ; Beneš, Petr (advisor)
The bachelor thesis deals with the design of a sensor for measuring the position of the Sun. In the first part, a theoretical analysis is made concerning methods of indicating the position of the Sun, patent searches and commercially available devices. The second part includes the preparation, the computer simulations performed, the actual design of the sensor and the evaluation of the results obtained.
System for verification of the signal quality dependence of a laser vibrometer.
Skalský, Ondřej ; Čala, Martin (referee) ; Pikula, Stanislav (advisor)
This thesis deals with a general theoretical description of the laser Doppler vibrometer with respect to parasitic phenomena, the design and implementation of a measurement system verifying the effects of these phenomena and the measurements performed. For a better understanding, the theoretical part includes not only a discussion of the principles of the laser Doppler vibrometer and its parasitic effects, but also the principles that the laser Doppler vibrometer uses to operate and on which it is based are discussed in detail. Mention is also made of vibrometers of other principles. The practical part of the thesis deals mainly with the design and implementation of a measuring system that can measure the dependence of the quality of vibration measurement on the angle and distance of the surface. This includes, of course, the presentation of the measured data, which to some extent confirms the theoretical assumptions, but also reveals new findings.
Data collection from sensors - confirmation of the temperature chamber
Platko, Peter ; Čala, Martin (referee) ; Šedivá, Soňa (advisor)
Thesis deals with desing and implementation of automated data collection during confirmation of temperature chamber. First chapter describes the confirmation of temperature chamber. Second chapter consist of overview of temperature sensors and description of hardware used in the thesis. Third chapter describes work with selected LabVIEW libraries and architectures. Whole LabVIEW application is described in chapter four. Chapter Fifth chapter serves as user manual and last chapter consist of evaluation of application and ideas for improvements.
Tool for visualization and listening of vibration signals
Slavov, Jan ; Mancl, Vlastimil (referee) ; Čala, Martin (advisor)
This bachelor thesis deals with the development of a tool for visualization and listening of vibrational signals. The aim of the work is to find out the possibilities of the LabVIEW development environment in the area for which the application is intended, to further evaluate similar programs offered on the market and to create an application that will allow the user basic signal processing. The application also allows you to work with the myDAQ device and listen to signals through speakers, during which it will display the current playback position.
Automatic acquisition of values from measurement devices without communication interface
Dohnálek, Martin ; Čala, Martin (referee) ; Kunz, Jan (advisor)
This bachelor thesis deals with the matter of optical character recognition from displays of measurement devices without communication interface. This would allow carrying out automated experiments using cheaper or older gear, which is not endowed with means for direct connection to a computer. Input image necessary for the character recognition is acquired using a camera pointed at a display of the device. The recognition is afterwards performed on periodically captured image based on an already existing dataset for particular apparatus. The output of the algorithm is a file containing recognized values, units, and timestamps of the recognition. The tool for creating datasets was designed as well. The achieved speed of recognition (as fast as 34 ms per iteration) during practical testing confirmed the sufficient optimalization of OCR algorithm. On the other hand, the determined hit rate of recognition abiding specified conditions was nearly 100 %. Lastly, the resistance to misalignment of display and sensor plane was monitored. The OCR algorithm is resilient to horizontal tilt up to +/- 5° and vertical tilt up to +/- 20°.

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1 Čala, M.
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