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NVH Analysis of the Powertrain
Mrózek, Jan ; Řehák, Kamil (referee) ; Prokop, Aleš (advisor)
This master thesis is focused on the diagnostics of vibrations and noise of an internal combustion engine. The work also includes a summary of the current state of knowledge in which the quantities used, transmission paths, measuring devices and the possibilities of performing frequency analysis are analysed. As part of the technical experiment on which this work is based, vibrations and noise on the tractor engine are measured. The obtained data are then further processed using the BK Connect program. Subsequently, a frequency analysis is performed, specifically an order analysis. The conclusion of the analysis consists of an evaluation of individual orders that cause excitation that occur in the investigated motor.
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Negative Influences of Spindle Vibrations
Dvořák, Pavel ; Huml, Jan (referee) ; Havlíková, Marie (advisor)
This bachelor’s thesis deals with the vibration measuring of the spindle no.1 of the machine tool STRATOS. The vibrations have a fundamental impact both on the machining process and on the observance of a prescribed tolerance. This thesis also treats the accelerometers function principles, namely of the piezoelectric and piezoresistive ones. The aim of the research is to collect the data needed for the proposition of a suitable monitoring mechanism which will monitor the condition of the machining spindle. The thesis also includes a prototypal protocol about the measuring procedure, its achieved results, and graphs. The issue analysis is conceived to the effect that it is applicable for the realization of the monitoring mechanism which will be part of the process and will show the actual state and the condition of the spindle.
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Wireless Security System
Matyáš, Jan ; Kočí, Radek (referee) ; Hanáček, Petr (advisor)
This thesis describes the design and implementation of portable wireless security device for monitoring object. The device consists of a control module allowing user to set and monitor current state of the measuring module which communicates with the control module wireless using the ISM band. The device is battery powered and highest possible battery life per charge is required.
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Measuring of pulse rate using smartphone
Víteček, Jiří ; Smital, Lukáš (referee) ; Němcová, Andrea (advisor)
This bachelor thesis deals with the possibility to measure heart rate using a smartphone. Today, many people own a smartphone. Newer devices can record various data thanks to its sensors and additional equipment. The current trend is to use the data so that the mobile phone can replace other devices, e.g. navigation, camera, camcorder or multimedia player. Recently, mobile phones have also been used in the field of medicine and, thanks to their mass extension, there is the potential to use them to detect health problems early on. With a functional mobile application, testing becomes cheap, fast, always available and easy to the general public. The beginning of the thesis describes the basic facts about physiology and anatomy of the heart, and circulatory system. Methods of heart rate monitoring using standard devices and smartphones, and measurement history are discussed as well. Two proposed methods using the smartphone's microphone and accelerometer are described below. For each method, testing and statistical evaluation are described. The thesis confirmed the possibility of using these methods for relatively accurate pulse rate measurement, even under different measuring conditions. Created applications with graphical user interfaces are described in the thesis including examples. The last part contains a comparison of methods, recommendations for measurement and final evaluation.
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NVH Analysis of the Powertrain
Mrózek, Jan ; Řehák, Kamil (referee) ; Prokop, Aleš (advisor)
This master thesis is focused on the diagnostics of vibrations and noise of an internal combustion engine. The work also includes a summary of the current state of knowledge in which the quantities used, transmission paths, measuring devices and the possibilities of performing frequency analysis are analysed. As part of the technical experiment on which this work is based, vibrations and noise on the tractor engine are measured. The obtained data are then further processed using the BK Connect program. Subsequently, a frequency analysis is performed, specifically an order analysis. The conclusion of the analysis consists of an evaluation of individual orders that cause excitation that occur in the investigated motor.
|
|
|
Measuring of pulse rate using smartphone
Víteček, Jiří ; Smital, Lukáš (referee) ; Němcová, Andrea (advisor)
This bachelor thesis deals with the possibility to measure heart rate using a smartphone. Today, many people own a smartphone. Newer devices can record various data thanks to its sensors and additional equipment. The current trend is to use the data so that the mobile phone can replace other devices, e.g. navigation, camera, camcorder or multimedia player. Recently, mobile phones have also been used in the field of medicine and, thanks to their mass extension, there is the potential to use them to detect health problems early on. With a functional mobile application, testing becomes cheap, fast, always available and easy to the general public. The beginning of the thesis describes the basic facts about physiology and anatomy of the heart, and circulatory system. Methods of heart rate monitoring using standard devices and smartphones, and measurement history are discussed as well. Two proposed methods using the smartphone's microphone and accelerometer are described below. For each method, testing and statistical evaluation are described. The thesis confirmed the possibility of using these methods for relatively accurate pulse rate measurement, even under different measuring conditions. Created applications with graphical user interfaces are described in the thesis including examples. The last part contains a comparison of methods, recommendations for measurement and final evaluation.
|
|
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Wireless Security System
Matyáš, Jan ; Kočí, Radek (referee) ; Hanáček, Petr (advisor)
This thesis describes the design and implementation of portable wireless security device for monitoring object. The device consists of a control module allowing user to set and monitor current state of the measuring module which communicates with the control module wireless using the ISM band. The device is battery powered and highest possible battery life per charge is required.
|
|
| |
|
|
Negative Influences of Spindle Vibrations
Dvořák, Pavel ; Huml, Jan (referee) ; Havlíková, Marie (advisor)
This bachelor’s thesis deals with the vibration measuring of the spindle no.1 of the machine tool STRATOS. The vibrations have a fundamental impact both on the machining process and on the observance of a prescribed tolerance. This thesis also treats the accelerometers function principles, namely of the piezoelectric and piezoresistive ones. The aim of the research is to collect the data needed for the proposition of a suitable monitoring mechanism which will monitor the condition of the machining spindle. The thesis also includes a prototypal protocol about the measuring procedure, its achieved results, and graphs. The issue analysis is conceived to the effect that it is applicable for the realization of the monitoring mechanism which will be part of the process and will show the actual state and the condition of the spindle.
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