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    Enhanced EMD-RDT Method for Output-Only Ambient Modal Identification of Structures

    Source: Journal of Aerospace Engineering:;2019:;Volume ( 032 ):;issue: 004
    Author:
    Z. Q. Feng
    ,
    B. Zhao
    ,
    X. G. Hua
    ,
    Z. Q. Chen
    DOI: 10.1061/(ASCE)AS.1943-5525.0001034
    Publisher: American Society of Civil Engineers
    Abstract: An enhanced approach of empirical mode decomposition based random decrement technique (EMD-RDT) is proposed for output-only modal parameter identification of structures using ambient vibration measurements. In the conventional EMD-RDT method, modal parameters are identified for each mode through Hilbert transform or least-square fitting from the free-decay modal responses, which are produced by EMD and RDT sequentially. The identification process is time consuming, and many uncertainties are involved. The novel enhancements of the proposed method lie in two aspects: computation efficiency and uncertainty treatment. On one hand, a novel decomposition method is proposed to separate the mode shape and the modal coordinates from the free-decay modal responses, thus making the identification process more efficient. On the other hand, a bootstrap approach is employed to quantify the uncertainties of modal parameters by providing surrogate estimates to generate useful statistics. Examples using both simulated data from a six degrees-of-freedom (six-DOF) system and experimental data from a three-story shear building structure are presented to demonstrate the proposed method, of which the effectiveness and the efficiency are confirmed by the identified results.
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      Enhanced EMD-RDT Method for Output-Only Ambient Modal Identification of Structures

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4260473
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    contributor authorZ. Q. Feng
    contributor authorB. Zhao
    contributor authorX. G. Hua
    contributor authorZ. Q. Chen
    date accessioned2019-09-18T10:42:12Z
    date available2019-09-18T10:42:12Z
    date issued2019
    identifier other%28ASCE%29AS.1943-5525.0001034.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4260473
    description abstractAn enhanced approach of empirical mode decomposition based random decrement technique (EMD-RDT) is proposed for output-only modal parameter identification of structures using ambient vibration measurements. In the conventional EMD-RDT method, modal parameters are identified for each mode through Hilbert transform or least-square fitting from the free-decay modal responses, which are produced by EMD and RDT sequentially. The identification process is time consuming, and many uncertainties are involved. The novel enhancements of the proposed method lie in two aspects: computation efficiency and uncertainty treatment. On one hand, a novel decomposition method is proposed to separate the mode shape and the modal coordinates from the free-decay modal responses, thus making the identification process more efficient. On the other hand, a bootstrap approach is employed to quantify the uncertainties of modal parameters by providing surrogate estimates to generate useful statistics. Examples using both simulated data from a six degrees-of-freedom (six-DOF) system and experimental data from a three-story shear building structure are presented to demonstrate the proposed method, of which the effectiveness and the efficiency are confirmed by the identified results.
    publisherAmerican Society of Civil Engineers
    titleEnhanced EMD-RDT Method for Output-Only Ambient Modal Identification of Structures
    typeJournal Paper
    journal volume32
    journal issue4
    journal titleJournal of Aerospace Engineering
    identifier doi10.1061/(ASCE)AS.1943-5525.0001034
    page04019046
    treeJournal of Aerospace Engineering:;2019:;Volume ( 032 ):;issue: 004
    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
    yabeshDSpacePersian