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Evaluation of Campbell diagrams for vertical hydropower machines supported by Tilting Pad Journal Bearings
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.
Vattenfall Research & Development.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.ORCID iD: 0000-0001-6016-6342
2016 (English)Conference paper, Oral presentation only (Refereed)
Abstract [en]

In vertically oriented machines with tilting-pad journal bearings, there is no static load that allow tocalculate the bearing properties around a determined static position. As a result, most of simulationsare performed by solving Reynolds equation at each time-step which can result in long computationaltime. To avoid this concern, a simplified model is used that takes in account the variation of unbalanceload depending on the pad configuration. This nonlinear model is used to simulate the dynamics ofa hydropower turbine and compared with the Campbell diagram calculations used from hydropowerindustry standards. A comparison between the linear and nonlinear model is performed to evaluate howaccurate the linear model is and until which limits it can be relevant. In case of qualitative discrepancies inthe results in terms of natural frequencies and damping ratios, an improvement of the Campbell diagramcalculation is proposed to obtain a more accurate linear model.

Place, publisher, year, edition, pages
2016.
National Category
Other Mechanical Engineering
Research subject
Computer Aided Design
Identifiers
URN: urn:nbn:se:ltu:diva-28712Local ID: 29ab5e4d-7713-45f0-b737-a00d7d7c803bOAI: oai:DiVA.org:ltu-28712DiVA, id: diva2:1001915
Conference
International Symposium on Transport Phenomena and Dynamics of Rotating Machinery : 10/04/2016 - 15/04/2016
Note
Godkänd; 2016; 20160513 (flothi)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved

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Thiery, FlorianAidanpää, Jan-Olov
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CiteExportLink to record
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Output format
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