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    Experimental Study on Complex Modes of an End-Damped Continuous Beam

    Source: Journal of Vibration and Acoustics:;2017:;volume( 139 ):;issue: 006::page 61014
    Author:
    Xing, Xing
    ,
    Feeny, Brian F.
    DOI: 10.1115/1.4037301
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: The complex modes of an end-damped cantilevered beam are studied as an experimental example of a nonmodally damped continuous system. An eddy-current damper is applied, for its noncontact and linear properties, to the end of the beam, and is then characterized to obtain the effective damping coefficient. The state-variable modal decomposition (SVMD) is applied to extract the modes from the impact responses in the cantilevered beam experiments. Characteristics of the mode shapes and modal damping are examined for various values of the end-damper damping coefficient. The modal frequencies and mode shapes obtained from the experiments have a good consistency with the results of the finite element model. The variation of the modal damping ratio and modal nonsynchronicity with varying end-damper damping coefficient also follow the prediction of the model. Over the range of damping coefficients studied in the experiments, we observe a maximum damping ratio in the lowest underdamped mode, which correlates with the maximum modal nonsynchronicity. Complex orthogonal decomposition (COD) is applied in comparison to the modal identification results obtained from SVMD.
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      Experimental Study on Complex Modes of an End-Damped Continuous Beam

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4236305
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    contributor authorXing, Xing
    contributor authorFeeny, Brian F.
    date accessioned2017-11-25T07:20:14Z
    date available2017-11-25T07:20:14Z
    date copyright2017/16/8
    date issued2017
    identifier issn1048-9002
    identifier othervib_139_06_061014.pdf
    identifier urihttp://138.201.223.254:8080/yetl1/handle/yetl/4236305
    description abstractThe complex modes of an end-damped cantilevered beam are studied as an experimental example of a nonmodally damped continuous system. An eddy-current damper is applied, for its noncontact and linear properties, to the end of the beam, and is then characterized to obtain the effective damping coefficient. The state-variable modal decomposition (SVMD) is applied to extract the modes from the impact responses in the cantilevered beam experiments. Characteristics of the mode shapes and modal damping are examined for various values of the end-damper damping coefficient. The modal frequencies and mode shapes obtained from the experiments have a good consistency with the results of the finite element model. The variation of the modal damping ratio and modal nonsynchronicity with varying end-damper damping coefficient also follow the prediction of the model. Over the range of damping coefficients studied in the experiments, we observe a maximum damping ratio in the lowest underdamped mode, which correlates with the maximum modal nonsynchronicity. Complex orthogonal decomposition (COD) is applied in comparison to the modal identification results obtained from SVMD.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleExperimental Study on Complex Modes of an End-Damped Continuous Beam
    typeJournal Paper
    journal volume139
    journal issue6
    journal titleJournal of Vibration and Acoustics
    identifier doi10.1115/1.4037301
    journal fristpage61014
    journal lastpage061014-9
    treeJournal of Vibration and Acoustics:;2017:;volume( 139 ):;issue: 006
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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