Structure evaluation system and structure evaluation method

Patent metadata

Field	Value
Publication number	US-2019383696-A1
Application number	US-201916551857-A
Country	US
Kind code	A1
Filing date	Aug 27, 2019
Priority date	Feb 27, 2018
Publication date	Dec 19, 2019
Grant date	—

Abstract

According to one embodiment, a structure evaluation system according to an embodiment includes a plurality of sensors, a position locator, and an evaluator. The plurality of sensors detect elastic waves. The position locator locates positions of elastic wave sources by using the elastic waves among the plurality of elastic waves respectively detected by the plurality of sensors having an amplitude exceeding a threshold value determined according to positions of the sources of the plurality of elastic waves and the positions of the plurality of disposed sensors. The evaluator evaluates a deteriorated state of the structure on the basis of results of the position locating of the elastic wave sources which is performed by the position locator.

First claim

What is claimed is:

1 . A structure evaluation system comprising:
a plurality of sensors which detect elastic waves; a position locator which locates positions of elastic wave sources by using the elastic waves among the plurality of elastic waves respectively detected by the plurality of sensors having an amplitude exceeding a threshold value determined according to positions of the wave sources of the plurality of elastic waves and the positions of the plurality of disposed sensors; and an evaluator which evaluates a deteriorated state of the structure on the basis of results of the position locating of the elastic wave sources which are performed by the position locator.

2 . The structure evaluation system according to claim 1 , wherein the position locator divides a measurement target region into a plurality of regions on the basis of the positions of the sources of the plurality of elastic waves and the positions of the plurality of disposed sensors, sets a different threshold value for each region obtained by the division, and locates the positions of the elastic wave sources by using the elastic waves having an amplitude exceeding the set threshold value.

3 . The structure evaluation system according to claim 1 , further comprising:
a signal processor which compares amplitudes of the plurality of elastic waves respectively detected by the plurality of sensors with a first threshold value and performs signal processing on the elastic waves having an amplitude value greater than the first threshold value.

4 . A structure evaluation system comprising:
a plurality of sensors which detect elastic waves; a position locator which locates positions of elastic wave sources on the basis of the plurality of elastic waves respectively detected by the plurality of sensors; a density distribution generator which generates an elastic wave source density distribution representing a distribution of densities of the elastic wave sources on the basis of results of the position locating of the elastic wave sources which are performed by the position locator; a corrector which corrects the elastic wave source density distribution by using a correction coefficient for correcting the elastic wave source density distribution in accordance with positions of the plurality of disposed sensors; and an evaluator which evaluates a deteriorated state of the structure on the basis of the elastic wave source density distribution corrected by the corrector.

5 . The structure evaluation system according to claim 4 , further comprising:
a signal processor which compares amplitudes of the plurality of elastic waves respectively detected by the plurality of sensors with a first threshold value and performs signal processing on the elastic waves having an amplitude value greater than the first threshold value.

6 . A structure evaluation system comprising:
a plurality of sensors which detect elastic waves; a position locator which locates positions of elastic wave sources on the basis of the plurality of elastic waves respectively detected by the plurality of sensors; a density distribution generator which generates an elastic wave source density distribution representing a distribution of densities of the elastic wave sources on the basis of results of the position locating of the elastic wave sources which is performed by the position locator; a corrector which corrects an elastic wave source density distribution serving as a comparison target which is obtained in advance by a sound structure by using a correction magnification for correcting the elastic wave source density distribution serving as a comparison target, in accordance with positions of the plurality of disposed sensors; and an evaluator which evaluates a deteriorated state of the structure on the basis of the elastic wave source density distribution generated by the density distribution generator and the elastic wave source density distribution serving as a comparison target which is corrected by the corrector.

7 . The structure evaluation system according to claim 6 , further comprising:
a signal processor which compares amplitudes of the plurality of elastic waves respectively detected by the plurality of sensors with a first threshold value and performs signal processing on the elastic waves having an amplitude value greater than the first threshold value.

8 . A structure evaluation method comprising:
a position locating step of locating positions of elastic wave sources by using the elastic waves among the plurality of elastic waves respectively detected by the plurality of sensors having an amplitude exceeding a threshold value determined according to positions of the sources of the plurality of elastic waves and the positions of the plurality of disposed sensors; and an evaluation step of evaluating a deteriorated state of the structure on the basis of results of the position locating of the elastic wave sources which is performed in the position locating step.

9 . A structure evaluation method comprising:
a position locating step of locating positions of elastic wave sources on the basis of a plurality of elastic waves respectively detected by a plurality of sensors detecting elastic waves; a density distribution generation step of generating an elastic wave source density distribution representing a distribution of densities of the elastic wave sources on the basis of results of the position locating of the elastic wave sources which is performed in the position locating step; a correction step of correcting the elastic wave source density distribution by using a correction coefficient for correcting the elastic wave source density distribution in accordance with positions of the plurality of disposed sensors; and an evaluation step of evaluating a deteriorated state of the structure on the basis of the elastic wave source density distribution corrected in the correction step.

10 . A structure evaluation method comprising:
a position locating step of locating positions of elastic wave sources on the basis of a plurality of elastic waves respectively detected by a plurality of sensors detecting elastic waves; a density distribution generation step of generating an elastic wave source density distribution representing a distribution of densities of the elastic wave sources on the basis of results of the position locating of the elastic wave sources which is performed in the position locating step; a correction step of correcting an elastic wave source density distribution serving as a comparison target which is obtained in advance by a sound structure by using a correction magnification for correcting the elastic wave source density distribution serving as a comparison target, in accordance with positions of the plurality of disposed sensors; and an evaluation step of evaluating a deteriorated state of the structure on the basis of the elastic wave source density distribution generated in the density distribution generation step and the elastic wave source density distribution serving as a comparison target which is corrected in the correction step.

Assignees

• Toshiba Kk
• Univ Kyoto

Inventors

• SHIOTANI Tomoki
• Hashimoto Katsufumi
• Takamine Hidefumi
• Watabe Kazuo

Classifications

• G01M5/0033

  by determining damage, crack or wear · CPC title

• G01M5/0066 Primary

  by exciting or detecting vibration or acceleration (vibration testing of structures G01M7/00) · CPC title

• G01M7/08

  Shock-testing · CPC title

• G01M5/0008 Primary

  of bridges · CPC title

• G01N29/14 Primary

  using acoustic emission techniques {(echo of particles G01N29/046; measuring mechanical vibrations or acoustic waves in solids in general G01H1/00)} · CPC title