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Nonlinear dynamic analysis of vertical rotors with tilting pad journal bearings
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.ORCID iD: 0009-0000-8078-5036
2021 (English)Licentiate thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Luleå: Luleå University of Technology, 2021.
Series
Licentiate thesis / Luleå University of Technology, ISSN 1402-1757
Keywords [en]
vertical rotor, tilting pad journal bearing, stiffness, damping
National Category
Applied Mechanics
Research subject
Machine Design
Identifiers
URN: urn:nbn:se:ltu:diva-87453ISBN: 978-91-7790-946-0 (print)ISBN: 978-91-7790-947-7 (electronic)OAI: oai:DiVA.org:ltu-87453DiVA, id: diva2:1602051
Presentation
2022-02-04, E632, Luleå, 09:00 (English)
Opponent
Supervisors
Projects
Swedish Hydropower Centre - SVCAvailable from: 2021-10-11 Created: 2021-10-11 Last updated: 2024-04-08Bibliographically approved
List of papers
1. Numerical and experimental study on the dynamic bearing properties of a four-pad and eight-pad tilting pad journal bearings in a vertical rotor 
Open this publication in new window or tab >>Numerical and experimental study on the dynamic bearing properties of a four-pad and eight-pad tilting pad journal bearings in a vertical rotor 
2022 (English)In: Journal of energy resources technology, ISSN 0195-0738, E-ISSN 1528-8994, Vol. 144, no 1Article in journal (Refereed) Published
Abstract [en]

In this paper, the dynamics of tilting pad journal bearings with four and eight pads are studied and compared experimentally and numerically. The experiments are performed on a rigid vertical rotor supported by two identical bearings. Two sets of experiments are carried out under similar test setup. One set is performed on a rigid rotor with two four-pad bearings, while the other is on a rigid rotor with two eight-pad bearings. The dynamic properties of the two bearing types are compared with each other by studying the unbalance response of the system at different rotor speeds. Numerically, the test rig is modeled as a rigid rotor and the bearing coefficients are calculated based on Navier-Stokes equation. A nonlinear bearing model is developed and used in the steady state response simulation. The measured and simulated displacement and force orbits show similar patterns for both bearing types. Compared to the measurement, the simulated mean value and range (peak-to-peak amplitude) of the bearing force deviate with a maximum of 16 % and 38 %, respectively. It is concluded that, unlike the eight-pad TPJB, the four-pad TPJB excite the system at the third and fifth-order frequencies, which are due to the number of pads, and the amplitudes of these frequencies increase with the rotor speed. 

Place, publisher, year, edition, pages
American Society of Mechanical Engineers (ASME), 2022
Keywords
Bearing Stiffness, Damping Coefficient, Tilting Pad Journal Bearing, Vertical Rotor
National Category
Applied Mechanics
Research subject
Machine Design
Identifiers
urn:nbn:se:ltu:diva-86610 (URN)10.1115/1.4052032 (DOI)000720985000020 ()2-s2.0-85137204906 (Scopus ID)
Note

Validerad;2021;Nivå 2;2021-09-01 (johcin)

Available from: 2021-08-16 Created: 2021-08-16 Last updated: 2024-04-08Bibliographically approved
2. A simplified bearing model for nonlinear dynamic analysis of a vertical rotor with four-pad tilting pad journal bearings
Open this publication in new window or tab >>A simplified bearing model for nonlinear dynamic analysis of a vertical rotor with four-pad tilting pad journal bearings
(English)Manuscript (preprint) (Other academic)
Keywords
vertical rotor, tilting pad journal bearing, stiffness, damping coeffiecient
National Category
Applied Mechanics
Research subject
Machine Design
Identifiers
urn:nbn:se:ltu:diva-87452 (URN)
Projects
Swedish Hydropower Centre - SVC
Available from: 2021-10-11 Created: 2021-10-11 Last updated: 2024-04-08
3. The startup dynamics of a vertical rotor supported by four-pad tilting pad journal bearings
Open this publication in new window or tab >>The startup dynamics of a vertical rotor supported by four-pad tilting pad journal bearings
(English)Manuscript (preprint) (Other academic)
Keywords
start-up dynamics, vertical rotor, tilting pad journal bearing, stiffness, damping
National Category
Applied Mechanics
Research subject
Machine Design
Identifiers
urn:nbn:se:ltu:diva-87451 (URN)
Projects
Swedish Hydropower Centre - SVC
Available from: 2021-10-11 Created: 2021-10-11 Last updated: 2024-04-08

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Benti, Gudeta

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Citation style
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Output format
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