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National Repository of Grey Literature 12 records found  previous11 - 12  jump to record: Search took 0.00 seconds. 
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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National Repository of Grey Literature : 12 records found   previous11 - 12  jump to record:
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2 ZÁVORKA, David
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