|
|
Meteorological station system
Čada, Jan ; Balík, Miroslav (referee) ; Lattenberg, Ivo (advisor)
This bachelor thesis deals with the design and implementation of a online meteorological station system, which consists of individual weather stations that communicate via the Internet with the server. The first part of the thesis discusses the principles of measuring major meteorological variables and deals with the selection of suitable sensors for measuring temperature, atmospheric pressure, humidity, wind speed and rainfall. In the practical part, one of the weather stations based on Raspberry Pi Zero microcomputer is designed and realized. As a complement to the measured data, the station includes a camera that captures the view from the site where the meteostation is installed. 3D printing is used to realize most of the mechanical parts, it has the advantage of speed, accuracy and easy reproducibility. For the measurement of temperature, pressure and humidity, a combined sensor BME280 from Bosch is used, which is placed in a small Stevenson screen. The wind speed is measured by a cup anemometer whose rotation is sensed by an integrated Hall sensor. The output pulses are then counted using the PCF8583 circuit, which has an I2C interface for reading the values with a Raspberry Pi microcomputer. Special attention is paid to the construction of a custom calibratable tipping bucket rain gauge with a resolution of 0,5 mm, whose mechanical motion is also sensed by a Hall sensor as in the anemometer. The reading of the data from sensors and sending it to the server is handled by a Python script. For storing and presenting data to users, a custom server solution based on LAMP webserver is implemented, its source codes are written in PHP, HTML, JavaScript and CSS. In addition to the web interface, which displays the data in graphs, the measured data can be also presented to the user via an application for mobile devices based on Android. The application was developed in C# using the Xamarin framework in the Microsoft Visual Studio development environment. Among other things, it implements a widget for quick access to the measured values directly from the home screen. In the final part of the thesis, interesting findings obtained by observing the measured values are mentioned.
|
|
|
Coilgun
Kovařík, Martin ; Pavlík, Michal (referee) ; Šteffan, Pavel (advisor)
This bachelor’s thesis describes the design and construction of electromagnetic gun for testing projectiles from different ferromagnetic materials with maximal power 19 J. Conventional projectile propulsion mechanisms include the use of compressed air or explosion which places theoretical limits on the maximum muzzle velocity limited by laws of thermodynamics. The electromagnetic coil gun, explores the use of electromagnetism in accelerating projectiles which offers a much higher theoretical limit on muzzle velocity. In addition of an electromagnetic acceleration is possible to regulate output velocity/energy of projectile, and acceleration applied on projectile.
|
|
|
Permanent magnet synchronous motor control with respect to simplicity of the realization
Vybíral, Ondřej ; Pohl, Lukáš (referee) ; Blaha, Petr (advisor)
This thesis deals with the problem of control of permanent magnet synchronous motor. The introduction describes division of motors according to the structure and with the stress on the BLDC motor. Control methods are also discussed there including clarification of concepts related to the control itself. The advantages and disadvantages of individual methods are compared. Six-step commutation was chosen based on the simple implementation criterion. The work includes Simulink simulation, simulating the BLDC motor LINIX 45ZWN24-40 controlled by six-step commutation. The thesis contains a comparison of simulated motor speeds at various control parameters. The conclusion of the thesis deals with the possibilities for subsequent implementation.
|
|
|
Current sensing with Hall-effect sensors
Štindl, Daniel ; Kovář, Jan (referee) ; Šotner, Roman (advisor)
This master's thesis deals with integrated Hall-effect current sensors. The thesis contains summary of manufacturers of current sensors suitable for low current measurement and comparison of their important parameters. Next objective of the thesis is a design of test board used for evaluation of temperature depedent accuracy of several sensors simultaneously. The device can be connected with PC through USB interface for saving measured values or automated control with other instruments.
|
|
|
Car Movement Measurent on Carrera Racing Tracks
Šíma, Vojtěch ; Malaník, Petr (referee) ; Rydlo, Štěpán (advisor)
The aim of this bachelor thesis is to design a measuring device that allows to measure quantities such as speed, acceleration and centripetal force while the car is moving on the Carrera racetrack. An embedded system will be created for measurement, where the main result is a printed circuit board that was created and mounted according to a schematic design composed of currently available electronic components. As the board moves along the race track, data is then recorded based on the implemented program, which is stored on a memory medium and later processed for a suitable visual presentation. Based on this data, it is then possible to analyse how the model behaves when moving on the autotrack and which factors have an effect on this movement.
|
|
|
Low power BLDC electric drive
Štajner, David ; Červinka, Dalibor (referee) ; Pazdera, Ivo (advisor)
The aim of this diploma thesis is to introduce a construction and controlling of the EC motor. On a base of knowledge make up a EC motor model in Matlab Simulink, with a position scanning providing by Hall probe. The EC motor model should be with its behavior close to the real EC motor as much as possible. There were a given requirements on the motor. On the base of those requirements was chosen a real EC motor. Its catalog values were put in the EC motor model in Matlab and the results were compared with real data. Next task was to design a real controlling driver of EC motor, which should has a minimal size. This driver was constructed and thermal test was made a on given load.
|
|
|
Car Movement Measurent on Carrera Racing Tracks
Šíma, Vojtěch ; Malaník, Petr (referee) ; Rydlo, Štěpán (advisor)
The aim of this bachelor thesis is to design a measuring device that allows to measure quantities such as speed, acceleration and centripetal force while the car is moving on the Carrera racetrack. An embedded system will be created for measurement, where the main result is a printed circuit board that was created and mounted according to a schematic design composed of currently available electronic components. As the board moves along the race track, data is then recorded based on the implemented program, which is stored on a memory medium and later processed for a suitable visual presentation. Based on this data, it is then possible to analyse how the model behaves when moving on the autotrack and which factors have an effect on this movement.
|
|
|
Meteorological station system
Čada, Jan ; Balík, Miroslav (referee) ; Lattenberg, Ivo (advisor)
This bachelor thesis deals with the design and implementation of a online meteorological station system, which consists of individual weather stations that communicate via the Internet with the server. The first part of the thesis discusses the principles of measuring major meteorological variables and deals with the selection of suitable sensors for measuring temperature, atmospheric pressure, humidity, wind speed and rainfall. In the practical part, one of the weather stations based on Raspberry Pi Zero microcomputer is designed and realized. As a complement to the measured data, the station includes a camera that captures the view from the site where the meteostation is installed. 3D printing is used to realize most of the mechanical parts, it has the advantage of speed, accuracy and easy reproducibility. For the measurement of temperature, pressure and humidity, a combined sensor BME280 from Bosch is used, which is placed in a small Stevenson screen. The wind speed is measured by a cup anemometer whose rotation is sensed by an integrated Hall sensor. The output pulses are then counted using the PCF8583 circuit, which has an I2C interface for reading the values with a Raspberry Pi microcomputer. Special attention is paid to the construction of a custom calibratable tipping bucket rain gauge with a resolution of 0,5 mm, whose mechanical motion is also sensed by a Hall sensor as in the anemometer. The reading of the data from sensors and sending it to the server is handled by a Python script. For storing and presenting data to users, a custom server solution based on LAMP webserver is implemented, its source codes are written in PHP, HTML, JavaScript and CSS. In addition to the web interface, which displays the data in graphs, the measured data can be also presented to the user via an application for mobile devices based on Android. The application was developed in C# using the Xamarin framework in the Microsoft Visual Studio development environment. Among other things, it implements a widget for quick access to the measured values directly from the home screen. In the final part of the thesis, interesting findings obtained by observing the measured values are mentioned.
|
|
|
Permanent magnet synchronous motor control with respect to simplicity of the realization
Vybíral, Ondřej ; Pohl, Lukáš (referee) ; Blaha, Petr (advisor)
This thesis deals with the problem of control of permanent magnet synchronous motor. The introduction describes division of motors according to the structure and with the stress on the BLDC motor. Control methods are also discussed there including clarification of concepts related to the control itself. The advantages and disadvantages of individual methods are compared. Six-step commutation was chosen based on the simple implementation criterion. The work includes Simulink simulation, simulating the BLDC motor LINIX 45ZWN24-40 controlled by six-step commutation. The thesis contains a comparison of simulated motor speeds at various control parameters. The conclusion of the thesis deals with the possibilities for subsequent implementation.
|
|
|
Low power BLDC electric drive
Štajner, David ; Červinka, Dalibor (referee) ; Pazdera, Ivo (advisor)
The aim of this diploma thesis is to introduce a construction and controlling of the EC motor. On a base of knowledge make up a EC motor model in Matlab Simulink, with a position scanning providing by Hall probe. The EC motor model should be with its behavior close to the real EC motor as much as possible. There were a given requirements on the motor. On the base of those requirements was chosen a real EC motor. Its catalog values were put in the EC motor model in Matlab and the results were compared with real data. Next task was to design a real controlling driver of EC motor, which should has a minimal size. This driver was constructed and thermal test was made a on given load.
|
guest ::
