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    Thermally Induced Whirl of a Rigid Rotor on Hydrodynamic Journal Bearings

    Source: Journal of Tribology:;1980:;volume( 102 ):;issue: 001::page 8
    Author:
    E. R. Maki
    ,
    H. A. Ezzat
    DOI: 10.1115/1.3251445
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: An experimental study was conducted on rigid rotors supported on 360° circumferentially grooved journal bearings. The effect of bearing clearance, lubricant inlet temperature, and supply pressure on whirl instability was examined. The experimental results indicate that self-excited whirl exists whenever the lubricant inlet temperature is higher than that of the bearing surface. On the other hand, when the bearing temperature is higher than the lubricant inlet temperature, whirl does not occur even at rotor speeds considerably higher than the instability threshold predicted by isothermal hydrodynamic theory. This thermally-induced whirl phenomenon has not been reported elsewhere and is documented in this paper. While the conditions giving rise to this phenomenon are unlikely to occur in the steady-state operation of high-speed bearings, they can exist under transient conditions. The findings of this study also provide strong evidence of the importance of thermohydrodynamic effects in considerations of stability of journal bearings.
    keyword(s): Rotors , Whirls , Journal bearings , Temperature , Bearings , Lubricants , Clearances (Engineering) , Pressure , Stability , Thermohydrodynamics AND Steady state ,
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      Thermally Induced Whirl of a Rigid Rotor on Hydrodynamic Journal Bearings

    URI
    http://yetl.yabesh.ir/yetl1/handle/yetl/93971
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    contributor authorE. R. Maki
    contributor authorH. A. Ezzat
    date accessioned2017-05-08T23:10:03Z
    date available2017-05-08T23:10:03Z
    date copyrightJanuary, 1980
    date issued1980
    identifier issn0742-4787
    identifier otherJOTRE9-28631#8_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/93971
    description abstractAn experimental study was conducted on rigid rotors supported on 360° circumferentially grooved journal bearings. The effect of bearing clearance, lubricant inlet temperature, and supply pressure on whirl instability was examined. The experimental results indicate that self-excited whirl exists whenever the lubricant inlet temperature is higher than that of the bearing surface. On the other hand, when the bearing temperature is higher than the lubricant inlet temperature, whirl does not occur even at rotor speeds considerably higher than the instability threshold predicted by isothermal hydrodynamic theory. This thermally-induced whirl phenomenon has not been reported elsewhere and is documented in this paper. While the conditions giving rise to this phenomenon are unlikely to occur in the steady-state operation of high-speed bearings, they can exist under transient conditions. The findings of this study also provide strong evidence of the importance of thermohydrodynamic effects in considerations of stability of journal bearings.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleThermally Induced Whirl of a Rigid Rotor on Hydrodynamic Journal Bearings
    typeJournal Paper
    journal volume102
    journal issue1
    journal titleJournal of Tribology
    identifier doi10.1115/1.3251445
    journal fristpage8
    journal lastpage14
    identifier eissn1528-8897
    keywordsRotors
    keywordsWhirls
    keywordsJournal bearings
    keywordsTemperature
    keywordsBearings
    keywordsLubricants
    keywordsClearances (Engineering)
    keywordsPressure
    keywordsStability
    keywordsThermohydrodynamics AND Steady state
    treeJournal of Tribology:;1980:;volume( 102 ):;issue: 001
    contenttypeFulltext
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