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    Nondestructive Evaluation of Parts With Degenerate Modes Using Pseudorepeated Roots

    Source: Journal of Dynamic Systems, Measurement, and Control:;2004:;volume( 126 ):;issue: 003::page 498
    Author:
    Brandon J. Jellison
    ,
    Research Assistant
    ,
    David C. Nelson
    ,
    Harold R. Kess
    ,
    Research Assistant
    ,
    Douglas E. Adams
    DOI: 10.1115/1.1789536
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: The modes of vibration of manufactured parts can be good indicators of the overall quality of the manufacturing process. That is, deviations in the modal frequencies or modal vectors of mechanical parts can help to identify outlier or systemic problems in the raw materials or fabrication procedure. A novel method for characterizing nonuniformities in homogeneous symmetric parts using pseudorepeated modal frequencies is discussed in this paper. It is demonstrated that the spacing between pseudorepeated roots in dominantly symmetric manufactured parts is a direct indicator of nonuniformities (i.e., inclusions, voids) in the stiffness or mass distributions. Smaller differences between split-peaks indicate less nonuniformity, and hence, higher quality parts. A simple fourth-order lumped parameter model is used to elaborate on this technique analytically, a representative finite element model is used to further this development, root locus techniques are used to study the sensitivity to nonuniformities, and acceleration response data from impact vibration tests on deep drawn hemispherical shells are used to verify the approach experimentally.
    keyword(s): Manufacturing , Nondestructive evaluation , Vibration , Frequency , Shells AND Stiffness ,
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      Nondestructive Evaluation of Parts With Degenerate Modes Using Pseudorepeated Roots

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    http://yetl.yabesh.ir/yetl1/handle/yetl/129758
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    contributor authorBrandon J. Jellison
    contributor authorResearch Assistant
    contributor authorDavid C. Nelson
    contributor authorHarold R. Kess
    contributor authorResearch Assistant
    contributor authorDouglas E. Adams
    date accessioned2017-05-09T00:12:34Z
    date available2017-05-09T00:12:34Z
    date copyrightSeptember, 2004
    date issued2004
    identifier issn0022-0434
    identifier otherJDSMAA-26333#498_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/129758
    description abstractThe modes of vibration of manufactured parts can be good indicators of the overall quality of the manufacturing process. That is, deviations in the modal frequencies or modal vectors of mechanical parts can help to identify outlier or systemic problems in the raw materials or fabrication procedure. A novel method for characterizing nonuniformities in homogeneous symmetric parts using pseudorepeated modal frequencies is discussed in this paper. It is demonstrated that the spacing between pseudorepeated roots in dominantly symmetric manufactured parts is a direct indicator of nonuniformities (i.e., inclusions, voids) in the stiffness or mass distributions. Smaller differences between split-peaks indicate less nonuniformity, and hence, higher quality parts. A simple fourth-order lumped parameter model is used to elaborate on this technique analytically, a representative finite element model is used to further this development, root locus techniques are used to study the sensitivity to nonuniformities, and acceleration response data from impact vibration tests on deep drawn hemispherical shells are used to verify the approach experimentally.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleNondestructive Evaluation of Parts With Degenerate Modes Using Pseudorepeated Roots
    typeJournal Paper
    journal volume126
    journal issue3
    journal titleJournal of Dynamic Systems, Measurement, and Control
    identifier doi10.1115/1.1789536
    journal fristpage498
    journal lastpage508
    identifier eissn1528-9028
    keywordsManufacturing
    keywordsNondestructive evaluation
    keywordsVibration
    keywordsFrequency
    keywordsShells AND Stiffness
    treeJournal of Dynamic Systems, Measurement, and Control:;2004:;volume( 126 ):;issue: 003
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
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