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Development and investigation of an instrument for film thickness measurements in PTFE lined thrust bearings
2002 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

One of the most important factors concerning the life of bearings is lubrication, sufficient lubrication. Hydrodynamic lubrication is especially requested in some particular applications. A thrust bearing for large vertical hydroelectric machines is an example of such an application. Several aspects of lubrication in thrust bearings will be investigated. One of the most important aspects is the determination of the thickness of a hydrodynamic lubrication film. There are many ways to determine thickness, but of course each application is different and demands different methods and types of transducers. In general, displacement transducers are used, because thickness can often be measured as a displacement. Three different methods are discussed and evaluated. Optical methods are frequently used for transducers due to some important advantages: they are compact, sensitive, material independent and reduce the possibility of disturbance of the signal due to earth-loops. Capacitive methods are based on rather simple principle of measuring the change in capacitance, caused by a displacement. A third method, which could be applied for this investigation, is based on the principle of inductance. Most inductance displacement transducers operate by detection of change in self- or mutual inductance of a coil when a ferromagnetic core is moved in its field. Most attention has been paid to an optical lever technique due to its independence from the materials. Inductive and capacitive techniques were used as reference.

Place, publisher, year, edition, pages
2002.
Keyword [en]
Technology, Optic lever technique
Keyword [sv]
Teknik
Identifiers
URN: urn:nbn:se:ltu:diva-53526ISRN: LTU-EX--02/120--SELocal ID: a8980b36-0e43-4461-b7c9-47cdc8ddcf64OAI: oai:DiVA.org:ltu-53526DiVA: diva2:1026900
Subject / course
Student thesis, at least 30 credits
Educational program
Mechanical Engineering, master's level
Examiners
Note
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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