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Title:
METHOD FOR ENGINEERING STRUCTURAL FIEXIBILITY IDENTIFICATION CONSIDERING THE IMPACT OF NOISE
Document Type and Number:
WIPO Patent Application WO/2021/159569
Kind Code:
A1
Abstract:
An engineering structure flexibility identification method considering noise influence comprises that a determination-stochastic subspace identification algorithm is initially used to acquire modal parameters of input and output signals with noise interference under different calculation orders in a bridge impact test; then, calculating the relative deviation of modal parameters between adjacent calculation orders by utilizing a stability diagram method, and marking the modal with the relative deviation smaller than a preset threshold value as a stable modal; judging the modal order of the structure by utilizing the stability diagram and determining modal parameters corresponding to each order; calculating a structure frequency response function and a frequency response function covariance matrix by utilizing the input and output data; taking the modal parameters of each order as initial values to construct an error function together with an actually measured frequency response function, and weighting the error function by utilizing a covariance matrix of the frequency response function; iteratively solving the minimum value of the error function by taking the modal parameter as an independent variable; and constructing a structure flexibility matrix by utilizing the modal parameter values after iterative convergence, and achieving the purpose of predicting the displacement of the structure under the action of any static load.

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Inventors:
YI TINGHUA (CN)
XUE MINGSHENG (CN)
QU CHUNXU (CN)
LI HONGNAN (CN)
Application Number:
PCT/CN2020/078138
Publication Date:
August 19, 2021
Filing Date:
March 06, 2020
Export Citation:
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Assignee:
UNIV DALIAN TECH (CN)
International Classes:
G06F30/20; G06F30/13
Foreign References:
CN103344448A2013-10-09
CN109598027A2019-04-09
CN107316295A2017-11-03
CN104750978A2015-07-01
CN108956614A2018-12-07
US20020065637A12002-05-30
Other References:
HE RUI: "Modal Identification and Its Error Analysis and Damage Detection in Structural Monitoring System of Long-span Bridges", CHINA DOCTORAL DISSERTATION FULL TEXT DATABASE, 15 April 2011 (2011-04-15), XP055835370
HE RUI, QUAN QIN: "Error analysis of time-domain modal identification methods of improved NExT-ERA", JOURNAL OF TSINGHUA UNIVERSITY (SCIENCE AND TECHNOLOGY), QUINHUA DAXUE, BEIJING, CN, vol. 49, no. 6, 31 December 2009 (2009-12-31), CN, pages 803 - 810, XP055835369, ISSN: 1000-0054, DOI: 10.16511/j.cnki.qhdxxb.2009.06.013
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