Experimental Investigations of Decentralised Control Design for The Stabilisation of Rotor-Gas Bearings

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Abstract

Rotor-gas bearings are attracting increasing interest because of their high speed capabilities, low friction and clean operation. However, hydrostatic rotor-gas bearings show reduced damping characteristics, which makes it challenging to operate the rotating machine at and about the resonance frequencies. Active lubrication of the journal during operations could enhance the damping and stabilisation characteristics of the sytems, and this could be achieved by means of stabilising controllers. This paper investigates the feasibility of using reduced order models obtained through Grey-Box identification for the design of stabilising controllers, capable of enabling the active lubrication of the journal. The root locus analysis shows that two different control solutions are feasible for the dampening of the first two eigenfrequencies of the rotor-gas bearing in the horizontal and vertical directions. Hardening and softening P-lead controllers are designed based on the models experimentally identified, and salient features of both controllers are discussed. Both controllers are implemented and validated on the physical test rig. Experimental results confirm the validity of the proposed approach.
Original languageEnglish
Title of host publicationProceedings of the XVII International Symposium on Dynamic Problems of Mechanics
Number of pages10
Publication date2015
Publication statusPublished - 2015
Event17th International Symposium on Dynamic Problems of Mechanics - Natal, Rio Grande do Norte, Brazil
Duration: 22 Feb 201527 Feb 2015
Conference number: 17

Conference

Conference17th International Symposium on Dynamic Problems of Mechanics
Number17
CountryBrazil
CityNatal, Rio Grande do Norte
Period22/02/201527/02/2015

Keywords

  • Decentralised control
  • Rotor-gas Bearings
  • Damping Injection
  • Experimental validation

Cite this

Theisen, L. R. S., Galeazzi, R., Niemann, H. H., & Santos, I. (2015). Experimental Investigations of Decentralised Control Design for The Stabilisation of Rotor-Gas Bearings. In Proceedings of the XVII International Symposium on Dynamic Problems of Mechanics
Theisen, Lukas Roy Svane ; Galeazzi, Roberto ; Niemann, Hans Henrik ; Santos, Ilmar. / Experimental Investigations of Decentralised Control Design for The Stabilisation of Rotor-Gas Bearings. Proceedings of the XVII International Symposium on Dynamic Problems of Mechanics. 2015.
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title = "Experimental Investigations of Decentralised Control Design for The Stabilisation of Rotor-Gas Bearings",
abstract = "Rotor-gas bearings are attracting increasing interest because of their high speed capabilities, low friction and clean operation. However, hydrostatic rotor-gas bearings show reduced damping characteristics, which makes it challenging to operate the rotating machine at and about the resonance frequencies. Active lubrication of the journal during operations could enhance the damping and stabilisation characteristics of the sytems, and this could be achieved by means of stabilising controllers. This paper investigates the feasibility of using reduced order models obtained through Grey-Box identification for the design of stabilising controllers, capable of enabling the active lubrication of the journal. The root locus analysis shows that two different control solutions are feasible for the dampening of the first two eigenfrequencies of the rotor-gas bearing in the horizontal and vertical directions. Hardening and softening P-lead controllers are designed based on the models experimentally identified, and salient features of both controllers are discussed. Both controllers are implemented and validated on the physical test rig. Experimental results confirm the validity of the proposed approach.",
keywords = "Decentralised control, Rotor-gas Bearings, Damping Injection, Experimental validation",
author = "Theisen, {Lukas Roy Svane} and Roberto Galeazzi and Niemann, {Hans Henrik} and Ilmar Santos",
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booktitle = "Proceedings of the XVII International Symposium on Dynamic Problems of Mechanics",

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Theisen, LRS, Galeazzi, R, Niemann, HH & Santos, I 2015, Experimental Investigations of Decentralised Control Design for The Stabilisation of Rotor-Gas Bearings. in Proceedings of the XVII International Symposium on Dynamic Problems of Mechanics. 17th International Symposium on Dynamic Problems of Mechanics, Natal, Rio Grande do Norte, Brazil, 22/02/2015.

Experimental Investigations of Decentralised Control Design for The Stabilisation of Rotor-Gas Bearings. / Theisen, Lukas Roy Svane; Galeazzi, Roberto; Niemann, Hans Henrik; Santos, Ilmar.

Proceedings of the XVII International Symposium on Dynamic Problems of Mechanics. 2015.

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

TY - GEN

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AU - Theisen, Lukas Roy Svane

AU - Galeazzi, Roberto

AU - Niemann, Hans Henrik

AU - Santos, Ilmar

PY - 2015

Y1 - 2015

N2 - Rotor-gas bearings are attracting increasing interest because of their high speed capabilities, low friction and clean operation. However, hydrostatic rotor-gas bearings show reduced damping characteristics, which makes it challenging to operate the rotating machine at and about the resonance frequencies. Active lubrication of the journal during operations could enhance the damping and stabilisation characteristics of the sytems, and this could be achieved by means of stabilising controllers. This paper investigates the feasibility of using reduced order models obtained through Grey-Box identification for the design of stabilising controllers, capable of enabling the active lubrication of the journal. The root locus analysis shows that two different control solutions are feasible for the dampening of the first two eigenfrequencies of the rotor-gas bearing in the horizontal and vertical directions. Hardening and softening P-lead controllers are designed based on the models experimentally identified, and salient features of both controllers are discussed. Both controllers are implemented and validated on the physical test rig. Experimental results confirm the validity of the proposed approach.

AB - Rotor-gas bearings are attracting increasing interest because of their high speed capabilities, low friction and clean operation. However, hydrostatic rotor-gas bearings show reduced damping characteristics, which makes it challenging to operate the rotating machine at and about the resonance frequencies. Active lubrication of the journal during operations could enhance the damping and stabilisation characteristics of the sytems, and this could be achieved by means of stabilising controllers. This paper investigates the feasibility of using reduced order models obtained through Grey-Box identification for the design of stabilising controllers, capable of enabling the active lubrication of the journal. The root locus analysis shows that two different control solutions are feasible for the dampening of the first two eigenfrequencies of the rotor-gas bearing in the horizontal and vertical directions. Hardening and softening P-lead controllers are designed based on the models experimentally identified, and salient features of both controllers are discussed. Both controllers are implemented and validated on the physical test rig. Experimental results confirm the validity of the proposed approach.

KW - Decentralised control

KW - Rotor-gas Bearings

KW - Damping Injection

KW - Experimental validation

M3 - Article in proceedings

BT - Proceedings of the XVII International Symposium on Dynamic Problems of Mechanics

ER -

Theisen LRS, Galeazzi R, Niemann HH, Santos I. Experimental Investigations of Decentralised Control Design for The Stabilisation of Rotor-Gas Bearings. In Proceedings of the XVII International Symposium on Dynamic Problems of Mechanics. 2015