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Influence of the thrust bearing on the natural frequencies of a72-MW hydropower rotor
(Hydro-Québec Research Institute, Varennes, Québec, Canada)
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.
Number of Authors: 2
2016 (English)In: IAHR symposium on Hydraulic Machinery and Systems, 2016, 236Conference paper, Abstract (Refereed)
Abstract [en]

The thrust bearing is an essential element of a hydropower machine. Not only does itcarry the total axial load but it also introduces stiffness and damping properties in the system.The focus of this study is on the influence of the thrust bearing on the lateral vibrations of theshaft of a 72-MW propeller turbine. The thrust bearing has a non-conventional design with alarge radius and two rows of thrust pads. A numerical model is developed to estimate naturalfrequencies. Numerical results are analyzed and related to experimental measurements of arunaway test.The results show the need to include the thrust bearing in the model. In fact, the vibrationmodes are substantially increased towards higher frequencies with the added properties fromthe thrust bearing. The second mode of vibration has been identified in the experimentalmeasurements. Its frequency and mode shape compare well with numerical results.

Place, publisher, year, edition, pages
2016. 236
Keyword [en]
rotordynamic rotor dynamic hydro power
National Category
Engineering and Technology Other Mechanical Engineering
Research subject
Computer Aided Design
Identifiers
URN: urn:nbn:se:ltu:diva-60846OAI: oai:DiVA.org:ltu-60846DiVA: diva2:1051116
Conference
28th IAHR symposium on Hydraulic Machinery and Systems, Grenoble July 4-8, 2016
Funder
Swedish Energy Agency, 192640
Available from: 2016-12-01 Created: 2016-12-01 Last updated: 2016-12-01Bibliographically approved

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Aidanpää, Jan-Olov
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