Method for analyzing structure safety
First Claim
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1. A method for analyzing structure safety, comprising the steps of:
- (a) installing a plurality of vibration sensors to a testing structure;
(b) using the plurality of vibration sensors to perform an initial vibration measurement to the testing structure and create basic information;
(c) capturing a continuous time-domain vibration signal of the testing structure, and converting the continuous time-domain vibration signal into a frequency-domain vibration signal by a fast Fourier transform, and then reducing Gibbs phenomenon induced in the frequency-domain vibration signal by applying a window function to the frequency domain vibration signal;
(d) filtering the frequency-domain vibration signal to determine an analyzing frequency range by using a filter;
(e1) obtaining top three characteristic frequencies from the analyzing frequency range;
(e2) graphing a moving frequency spectrum plot of the top three characteristic frequencies, wherein Y-coordinate of the moving frequency spectrum plot is the Frequency and X-coordinate of the moving frequency spectrum plot is Time; and
(e3) evaluating a structural safety of the testing structure by observing the moving frequency spectrum plot and determining whether the variations exceed a critical value.
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Abstract
The present invention discloses a method for analyzing structure safety, and the method uses valid vibration measurement signals to obtain mutual feedbacks for a structural model analysis and a calibrated structural model to simulate a disaster situation to obtain the critical force exertion and deformation scale of a structure. The method is applied to capture the stability index of the structure to analyze the structure safety or applied for a structure safety evaluation or a health monitoring, or even for a structure multi-hazards safety determination.
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Citations
3 Claims
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1. A method for analyzing structure safety, comprising the steps of:
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(a) installing a plurality of vibration sensors to a testing structure; (b) using the plurality of vibration sensors to perform an initial vibration measurement to the testing structure and create basic information; (c) capturing a continuous time-domain vibration signal of the testing structure, and converting the continuous time-domain vibration signal into a frequency-domain vibration signal by a fast Fourier transform, and then reducing Gibbs phenomenon induced in the frequency-domain vibration signal by applying a window function to the frequency domain vibration signal; (d) filtering the frequency-domain vibration signal to determine an analyzing frequency range by using a filter; (e1) obtaining top three characteristic frequencies from the analyzing frequency range; (e2) graphing a moving frequency spectrum plot of the top three characteristic frequencies, wherein Y-coordinate of the moving frequency spectrum plot is the Frequency and X-coordinate of the moving frequency spectrum plot is Time; and (e3) evaluating a structural safety of the testing structure by observing the moving frequency spectrum plot and determining whether the variations exceed a critical value. - View Dependent Claims (2, 3)
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Current AssigneeNational Taiwan University of Science and Technology
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Original AssigneeNational Taiwan University of Science and Technology
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InventorsLee, Wei-Feng, Chen, Cheng-Hsing, Lai, Yi-Chun, Mei, Hsing-Tai
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Primary Examiner(s)Macchiarolo, Peter
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Assistant Examiner(s)MILLER, ROSE MARY
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Application NumberUS13/216,243Publication NumberTime in Patent Office895 DaysField of Search735/79, 735/87, 735/94US Class Current73/579CPC Class CodesG01M 5/0066 by exciting or detecting vi...G01M 7/00 Vibration-testing of struct...
