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Monitoring of hydraulic machines using acoustic emissions
Závorka, Dalibor ; Pochylý, František (referee) ; Habán, Vladimír (advisor)
The goal of this diploma thesis is to clarify possibilities of usage of acoustic emission as a hydraulic machinery diagnostics tool. Especially for exposing presence of ruptures or cracks in the parts of machine, assuming changes in acoustic exposure of the part during operation. This clarification is based on series of simple measured experiments, which consist of monitoring the bolt placed in fluid stream inside of a pipe. This bolt was preloaded against inner wall of pipe by appropriate tightening torque. This preload is supposed to simulate effects of the size of rupture. High preload simulates small rupture or none in object and respectively small preload is supposed to simulate big rupture. A group of pressure sensors and accelerometers measures experiments and their evaluations are processed by script created in software MATLAB. Outputs of this script are charts with effective values of respective sensors from the entire record split into individual frequency spectrums. These charts compare spectrums of each configuration to judge effects of parameters changes.
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Acoustic diagnostics of combustion engines operating conditions
Závorka, Dalibor ; Prokop, Aleš (referee) ; Zubík, Martin (advisor)
The goal of this bachelor thesis is to hand over a compact overview of methods and today’s available equipment for the acoustic diagnostics of combustion engines. There are described the basic principles of diagnostics and acoustic diagnostics including definition of their basic terms. Work further deals with the description of methods and accessories of acoustic diagnostics and explains principles of their usage. Final chapter is dedicated to detailed description of the most common sound expressions of engine, signalling occurred or oncoming failure. Explaining the origins of particular sound, what can be its consequences and how to prevent these problems.
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Methodology for remote diagnostic of the automotive shock absorbers
Halama, Jakub ; Dočkal, Aleš (referee) ; Klapka, Milan (advisor)
The diploma thesis deals with the application of acoustic methods for evaluating the technical condition of the shock absorbers. Analysis of acoustic radiation during damping operation leads to the definition of a new non-contact diagnostic methodology that can determine the condition of the shock absorbers. The first part of the thesis focuses on the noise radiation of the shock absorbers, which is caused by discontinuous dumping. Further, the methods for the noise source localization available at The Institute of Machine and Industrial Design are described – with their functionalities, advantages and limitations. Based on all the information, an appropriate method is selected and used in the experimental part of this work. Then, aeration and removing the full volume of oil with damage of the shock absorber tube are caused (induced) on several types of the shocks. Noise radiation is measured by a microphone array and by a sound meter; the acoustic maps, frequency spectra and the synchronous filtration graphs are calculated from the measured data. From the differences in the acoustic radiations of each shock condition, a suitable diagnostic criterion for a specific shock absorber is defined. The final part discusses obtained results. Based on these results, a general diagnostic methodology, applicable to any type of shock absorber, is formulated.
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Autonomous system for acoustic analysis in diagnostics
Havlíček, Michal ; Marada, Tomáš (referee) ; Huzlík, Rostislav (advisor)
The aim of this diploma thesis are possibilities of sound analysis with Sipeed development platform using MaixBit hardware. The main goal is design and development of an autonomous device that after a command from a computer analyzes the ambient sound and converts the resulting information back to the computer screen. Usage of these devices in real world scenarios is evaluated in conclusion.
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Autonomous system for acoustic analysis in diagnostics
Havlíček, Michal ; Marada, Tomáš (referee) ; Huzlík, Rostislav (advisor)
The aim of this diploma thesis are possibilities of sound analysis with Sipeed development platform using MaixBit hardware. The main goal is design and development of an autonomous device that after a command from a computer analyzes the ambient sound and converts the resulting information back to the computer screen. Usage of these devices in real world scenarios is evaluated in conclusion.
|
|
|
Methodology for remote diagnostic of the automotive shock absorbers
Halama, Jakub ; Dočkal, Aleš (referee) ; Klapka, Milan (advisor)
The diploma thesis deals with the application of acoustic methods for evaluating the technical condition of the shock absorbers. Analysis of acoustic radiation during damping operation leads to the definition of a new non-contact diagnostic methodology that can determine the condition of the shock absorbers. The first part of the thesis focuses on the noise radiation of the shock absorbers, which is caused by discontinuous dumping. Further, the methods for the noise source localization available at The Institute of Machine and Industrial Design are described – with their functionalities, advantages and limitations. Based on all the information, an appropriate method is selected and used in the experimental part of this work. Then, aeration and removing the full volume of oil with damage of the shock absorber tube are caused (induced) on several types of the shocks. Noise radiation is measured by a microphone array and by a sound meter; the acoustic maps, frequency spectra and the synchronous filtration graphs are calculated from the measured data. From the differences in the acoustic radiations of each shock condition, a suitable diagnostic criterion for a specific shock absorber is defined. The final part discusses obtained results. Based on these results, a general diagnostic methodology, applicable to any type of shock absorber, is formulated.
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|
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Monitoring of hydraulic machines using acoustic emissions
Závorka, Dalibor ; Pochylý, František (referee) ; Habán, Vladimír (advisor)
The goal of this diploma thesis is to clarify possibilities of usage of acoustic emission as a hydraulic machinery diagnostics tool. Especially for exposing presence of ruptures or cracks in the parts of machine, assuming changes in acoustic exposure of the part during operation. This clarification is based on series of simple measured experiments, which consist of monitoring the bolt placed in fluid stream inside of a pipe. This bolt was preloaded against inner wall of pipe by appropriate tightening torque. This preload is supposed to simulate effects of the size of rupture. High preload simulates small rupture or none in object and respectively small preload is supposed to simulate big rupture. A group of pressure sensors and accelerometers measures experiments and their evaluations are processed by script created in software MATLAB. Outputs of this script are charts with effective values of respective sensors from the entire record split into individual frequency spectrums. These charts compare spectrums of each configuration to judge effects of parameters changes.
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|
| |
|
|
Acoustic diagnostics of combustion engines operating conditions
Závorka, Dalibor ; Prokop, Aleš (referee) ; Zubík, Martin (advisor)
The goal of this bachelor thesis is to hand over a compact overview of methods and today’s available equipment for the acoustic diagnostics of combustion engines. There are described the basic principles of diagnostics and acoustic diagnostics including definition of their basic terms. Work further deals with the description of methods and accessories of acoustic diagnostics and explains principles of their usage. Final chapter is dedicated to detailed description of the most common sound expressions of engine, signalling occurred or oncoming failure. Explaining the origins of particular sound, what can be its consequences and how to prevent these problems.
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