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Experimental and numerical simulation of unbalance response in vertical test rig with tilting-pad bearings
Hydro Power, ÅF, 80320 Gävle.
Vattenfall Research & Development.
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Produkt- och produktionsutveckling.ORCID-id: 0000-0001-6016-6342
2014 (Engelska)Ingår i: International Journal of Rotating Machinery, ISSN 1023-621X, E-ISSN 1542-3034, Vol. 2014, artikel-id 309767Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

In vertically oriented machines with journal bearing, there are no predefined static radial loads, such as dead weight for horizontal rotor. Most of the commercial software is designed to calculate rotordynamic and bearing properties based on machines with a horizontally oriented rotor; that is, the bearing properties are calculated at a static eccentricity. For tilting-pad bearings, there are no existing analytical expressions for bearing parameters and the bearing parameters are dependent on eccentricity and load angle. The objective of this paper is to present a simplified method to perform numerical simulations on vertical rotors including bearing parameters. Instead of recalculating the bearing parameters in each time step polynomials are used to represent the bearing parameters for present eccentricities and load angles. Numerical results are compared with results from tests performed in a test rig. The test rig consists of two guide bearings and a midspan rotor. The guide bearings are 4-pad tilting-pad bearings. Shaft displacement and strains in the bearing bracket are measured to determine the test rig's properties. The comparison between measurements and simulated results shows small deviations in absolute displacement and load levels, which can be expected due to difficulties in calculating exact bearing parameters.

Ort, förlag, år, upplaga, sidor
2014. Vol. 2014, artikel-id 309767
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Annan maskinteknik
Forskningsämne
Datorstödd maskinkonstruktion
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URN: urn:nbn:se:ltu:diva-4598DOI: 10.1155/2014/309767Scopus ID: 2-s2.0-84893176607Lokalt ID: 290d3f5f-5b04-4632-8843-95390c73bbd2OAI: oai:DiVA.org:ltu-4598DiVA, id: diva2:977472
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Validerad; 2014; 20140217 (andbra)Tillgänglig från: 2016-09-29 Skapad: 2016-09-29 Senast uppdaterad: 2018-07-10Bibliografiskt granskad

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Nässelqvist, MattiasAidanpää, Jan-Olov

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