×

Method for analyzing structure safety

  • US 8,640,544 B2
  • Filed: 08/24/2011
  • Issued: 02/04/2014
  • Est. Priority Date: 02/10/2011
  • Status: Active Grant
First Claim
Patent Images

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.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×