Ändra sökning
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Simplified transformation matrices of journal bearings in vertical application
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Produkt- och produktionsutveckling.ORCID-id: 0009-0000-8078-5036
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Produkt- och produktionsutveckling.ORCID-id: 0000-0001-6016-6342
Vattenfall AB Research and Development, Älvkarleby SE 81426, Sweden.
2023 (Engelska)Ingår i: Applications in Engineering Science, E-ISSN 2666-4968, Vol. 15, artikel-id 100147Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Rotodynamic simulation of complex or/and large systems, for instance hydropower machines, may consist of models with many degrees of freedom and require multidisciplinary computations such as fluid-thermal-structure interactions or rotor-stator interactions due to electromagnetic forces. Simulating such systems is often computationally heavy and impractical, especially in the case of optimization or parametric study, where many iterations are required. This has, therefore, created a need for simplified dynamic models to improve computational efficiency without significantly affecting the accuracy of the simulation result. The purpose of this paper is to present simplified coordinate transformation matrices for journal bearings in vertical rotors, which require less computational effort. Matrix multiplications, which appear during coordinate transformation, were eliminated, and the bearing stiffness and damping matrices in the fixed reference frame were represented by local coefficients instead. The dynamic response of a vertical rotor with eight-shoe Tilting pad journal bearings was simulated using the proposed model for two operational conditions, i.e., when the rotor was spinning at constant and variable speeds. The results from the proposed model were compared to those from the original model and validated through experiments. The conclusion was that the presented simulation model is time efficient and can effectively be used in rotordynamic simulations and analyses.

Ort, förlag, år, upplaga, sidor
Elsevier Ltd , 2023. Vol. 15, artikel-id 100147
Nyckelord [en]
Bearing coefficient, Coordinate transformation, Rotordynamics, Tilting pad journal bearing, Vertical rotor
Nationell ämneskategori
Annan maskinteknik
Forskningsämne
Maskinkonstruktion
Identifikatorer
URN: urn:nbn:se:ltu:diva-101362DOI: 10.1016/j.apples.2023.100147ISI: 001076998400001Scopus ID: 2-s2.0-85170036228OAI: oai:DiVA.org:ltu-101362DiVA, id: diva2:1797939
Anmärkning

Validerad;2023;Nivå 2;2023-09-18 (joosat);

CC BY 4.0 License

Tillgänglig från: 2023-09-18 Skapad: 2023-09-18 Senast uppdaterad: 2024-04-22Bibliografiskt granskad
Ingår i avhandling
1. Rotordynamic Modeling and Characterization of Support Elements in Vertical Machines
Öppna denna publikation i ny flik eller fönster >>Rotordynamic Modeling and Characterization of Support Elements in Vertical Machines
2024 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Alternativ titel[sv]
Rotordynamiska Modellering och Karakterisering av Stödelement i Vertikala Maskiner
Abstract [en]

The dynamic properties of rotating machines are highly influenced by supporting elements, such as bearings, seals, damping elements or housings. They play a significant role in regulating the characteristics of the interaction between the rotating and stationary parts of machines. Over the past few years, numerous research studies have been published focusing on the dynamics of such devices across a wide range of applications. The advancement of the research has significantly contributed to enhancing their performance and ensuring the smooth operation of rotating machinery by minimizing excessive vibrations that can lead to catastrophic failure. The research work in this thesis explores the dynamics of supporting elements in vertical rotating machinery, with a particular focus on hydropower applications. In fact, some of the concepts are generic and can be applied to horizontal rotors or any other types of rotating machines. Using numerical simulation and actual measurements, their contribution to the system’s overall performance was investigated. These include the self-induced vibration in vertical application tilting pad journal bearings, and vibration issues observed on a hydropower unit attributed to large bearing clearance. Also, particular attention was given to the influence of the squeeze film damper on the rotor-stator contact dynamics of hydropower units, using tools such as Poincaré maps and bifurcation diagrams.

Moreover, achieving optimal design of such devices requires, among other key aspects, accurate and reliable simulation models to facilitate the prediction and evaluation of their characteristics at any stage in the product development process. In rotordynamic simulations, a common approach for incorporating bearing forces in the system equation is by representing them with stiffness and damping coefficients. For a small vibrational amplitude about a static position, linearized bearing coefficient assumptions can be valid. This is especially applicable for operation under a large radial static load, such as in horizontal rotors, due to the dead weight of the rotor. For vertical rotors, however, the weight of the rotor acts axially, and the radial bearing load is usually low. The bearing coefficients show nonlinearity, making them dependent on the trajectory of the rotor. Therefore, the linear bearing assumption, which is valid for horizontal rotors, does not hold true for vertical rotors. This makes the simulation of a vertical machine more complicated as it typically involves solving the fluid film lubrication model. The classical numerical models can sometimes be computationally demanding and require impractically long computational time. An efficient and fast numerical simulation method which does not significantly affect the accuracy of the result is critical to facilitating the simulation processes effectively. This thesis details the suggested simplifications employed on the bearing models and transformation matrices in the numerical integration procedure. The results from these models were validated using experiments to ensure their reliability.

Ort, förlag, år, upplaga, sidor
Luleå: Luleå University of Technology, 2024
Serie
Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, ISSN 1402-1544
Nyckelord
Rotordynamic, Support Element, Bearing, Squeeze Film Damper, Hydropower, Vertical Machine
Nationell ämneskategori
Teknisk mekanik
Forskningsämne
Maskinkonstruktion
Identifikatorer
urn:nbn:se:ltu:diva-105194 (URN)978-91-8048-552-4 (ISBN)978-91-8048-553-1 (ISBN)
Disputation
2024-06-18, B192, Luleå tekniska universitet, Luleå, 09:00 (Engelska)
Opponent
Handledare
Tillgänglig från: 2024-04-22 Skapad: 2024-04-22 Senast uppdaterad: 2024-05-17Bibliografiskt granskad

Open Access i DiVA

fulltext(7540 kB)196 nedladdningar
Filinformation
Filnamn FULLTEXT01.pdfFilstorlek 7540 kBChecksumma SHA-512
0d0087502fea09535a93672911a38a8834a21fa542733d1b38af887cf9f0f693c5e6105be907213f0d91e3c9e8595d5e8f02b4a703dd0dc6bc7a9c34931f376e
Typ fulltextMimetyp application/pdf

Övriga länkar

Förlagets fulltextScopus

Person

Benti, Gudeta BerhanuAidanpää, Jan-Olov

Sök vidare i DiVA

Av författaren/redaktören
Benti, Gudeta BerhanuAidanpää, Jan-Olov
Av organisationen
Produkt- och produktionsutveckling
Annan maskinteknik

Sök vidare utanför DiVA

GoogleGoogle Scholar
Totalt: 196 nedladdningar
Antalet nedladdningar är summan av nedladdningar för alla fulltexter. Det kan inkludera t.ex tidigare versioner som nu inte längre är tillgängliga.

doi
urn-nbn

Altmetricpoäng

doi
urn-nbn
Totalt: 445 träffar
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf