Gas Bearing Control for Safe Operation in Critical Speed Regions - Experimental Verification: Paper

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    Abstract

    Gas bearings are popular for their high speed capabilities, low friction and clean operation, but require low clearances and suffer from poor damping properties. The poor damping properties cause high disturbance amplification near the natural frequencies. These become critical when the rotation speed coincides with a natural frequency. In these regions, even low mass unbalances can cause rub and damage the machine. To prevent rubbing, the variation of the rotation speed of machines supported by gas bearings has to be carefully conducted during run-ups and run-downs, by acceleration and deceleration patterns and avoidance of operation near the critical speeds, which is a limiting factor during operation, specially during run-downs. An approach for reducing the vibrations is by feedback controlled lubrication. This paper addresses the challenge of reducing vibrations in rotating machines supported by gas bearings to extend their operating range. Using H∞-design methods, active lubrication techniques are proposed to enhance the damping, which in turn reduces the vibrations to a desired safe level. The control design is validated experimentally on a laboratory test rig, and shown to allow safe shaft rotation speeds up to, in and above the two first critical speeds, which significantly extends the operating range.
    Original languageEnglish
    Article number012017
    Book seriesJournal of Physics: Conference Series
    Volume659
    Issue number1
    Number of pages11
    ISSN1742-6596
    DOIs
    Publication statusPublished - 2015
    Event12th European Workshop on Advanced Control and Diagnosis - Pilsen, Czech Republic
    Duration: 19 Nov 201520 Nov 2015
    Conference number: 12
    https://acd2015.zcu.cz/

    Workshop

    Workshop12th European Workshop on Advanced Control and Diagnosis
    Number12
    Country/TerritoryCzech Republic
    CityPilsen
    Period19/11/201520/11/2015
    Internet address

    Bibliographical note

    Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
    Published under licence by IOP Publishing Ltd

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