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Misalignment in combi-bearing: A cause of parametric instability in vertical rotor systems
Luleå tekniska universitet, Material- och solidmekanik.
Luleå tekniska universitet, Material- och solidmekanik.
Vattenfall Research & Development.
2013 (English)In: Journal of engineering for gas turbines and power, ISSN 0742-4795, E-ISSN 1528-8919, Vol. 135, no 3Article in journal (Refereed) Published
Abstract [en]

The dynamic characteristics of the combi-bearing (combined thrust-journal bearing) in vertical rotor systems were analytically modeled and experimentally verified in the authors' previous publications. An angular misalignment, which may be caused by a possible manufacturing or assembling error, is introduced in the combi-bearing's rotating collar. A new model of the defective combi-bearing has been derived. The derived model shows that the angular misalignment in the combi-bearing's rotating collar generates an asymmetry in the rotor system at the combi-bearing's location. The rotor system's stiffness in its two translational X and Y directions differ at the combi-bearing's location. Constant parameters and/or coefficients in rotating asymmetric structures appear to change with time when observed in the stationary frame. These time dependent parameters (coefficients) are the source of the so-called parametric instability in rotating systems. If the collar angular misalignment is located in the X-Z plane all rotor motions in this plane at the contact point between the combi-bearing and the rotor will be coupled. A parametric instability is observed within certain ranges of the rotor speed, depending on the magnitude of the angular misalignment

Place, publisher, year, edition, pages
2013. Vol. 135, no 3
National Category
Applied Mechanics
Research subject
Solid Mechanics
Identifiers
URN: urn:nbn:se:hb:diva-11480DOI: 10.1115/1.4007882Local ID: 5226b29f-b07b-446d-8b01-9092b0cb1c40OAI: oai:DiVA.org:hb-11480DiVA: diva2:1057042
Note

Validerad; 2013; Bibliografisk uppgift: Article number 032501; 20130521 (andbra)

Available from: 2016-09-29 Created: 2016-12-16 Last updated: 2016-12-16

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Luneno, Jean-Claude
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