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    Optimization of Groove Geometry for a Thrust Air Bearing According to Various Objective Functions

    Source: Journal of Tribology:;2009:;volume( 131 ):;issue: 004::page 41704
    Author:
    Hiromu Hashimoto
    ,
    Tadashi Namba
    DOI: 10.1115/1.3201860
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: Grooved thrust air bearings are widely used to support high-speed, low-loaded shafts in many rotating systems because of their low friction, noiseless operation, and simple structure. Several types of groove geometries, such as straight line, spiral, and herringbone, are commonly used in actual applications. Among these, the spiral groove is mainly used. However, as far as the authors know, there is no theoretical evidence that the spiral groove is the most optimized groove geometry in all possible groove geometries. This paper describes the optimum design for the groove geometry of thrust air bearings according to various objective functions such as air film thickness, bearing torque, dynamic stiffness of air film, and other similar combinations. In an optimum design, groove geometries are expressed by the third degree of spline function, and sequential quadratic programming is used as the optimization method. It is understood that the groove geometry for optimizing air film thickness or friction torque takes the basic form of spiral groove geometry. The geometry design for optimizing the dynamic stiffness is the modified spiral groove. Numerical results are compared with the measured data, and good agreements can be seen between them.
    keyword(s): Torque , Friction , Optimization , Functions , Geometry , Stiffness , Bearings , Thrust , Design AND Stress ,
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      Optimization of Groove Geometry for a Thrust Air Bearing According to Various Objective Functions

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    http://yetl.yabesh.ir/yetl1/handle/yetl/142025
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    contributor authorHiromu Hashimoto
    contributor authorTadashi Namba
    date accessioned2017-05-09T00:35:30Z
    date available2017-05-09T00:35:30Z
    date copyrightOctober, 2009
    date issued2009
    identifier issn0742-4787
    identifier otherJOTRE9-28769#041704_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/142025
    description abstractGrooved thrust air bearings are widely used to support high-speed, low-loaded shafts in many rotating systems because of their low friction, noiseless operation, and simple structure. Several types of groove geometries, such as straight line, spiral, and herringbone, are commonly used in actual applications. Among these, the spiral groove is mainly used. However, as far as the authors know, there is no theoretical evidence that the spiral groove is the most optimized groove geometry in all possible groove geometries. This paper describes the optimum design for the groove geometry of thrust air bearings according to various objective functions such as air film thickness, bearing torque, dynamic stiffness of air film, and other similar combinations. In an optimum design, groove geometries are expressed by the third degree of spline function, and sequential quadratic programming is used as the optimization method. It is understood that the groove geometry for optimizing air film thickness or friction torque takes the basic form of spiral groove geometry. The geometry design for optimizing the dynamic stiffness is the modified spiral groove. Numerical results are compared with the measured data, and good agreements can be seen between them.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleOptimization of Groove Geometry for a Thrust Air Bearing According to Various Objective Functions
    typeJournal Paper
    journal volume131
    journal issue4
    journal titleJournal of Tribology
    identifier doi10.1115/1.3201860
    journal fristpage41704
    identifier eissn1528-8897
    keywordsTorque
    keywordsFriction
    keywordsOptimization
    keywordsFunctions
    keywordsGeometry
    keywordsStiffness
    keywordsBearings
    keywordsThrust
    keywordsDesign AND Stress
    treeJournal of Tribology:;2009:;volume( 131 ):;issue: 004
    contenttypeFulltext
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