Structure evaluation system and structure evaluation method

Patent metadata

Field	Value
Publication number	US-11639880-B2
Application number	US-202117500335-A
Country	US
Kind code	B2
Filing date	Oct 13, 2021
Priority date	Feb 27, 2018
Publication date	May 2, 2023
Grant date	May 2, 2023

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 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.

2. 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.

3. 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

• 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

• G01N29/4463

  Signal correction, e.g. distance amplitude correction [DAC], distance gain size [DGS], noise filtering · CPC title

• G01M5/0033

  by determining damage, crack or wear · CPC title

• G01H1/08

  Amplitude · CPC title

• G01N29/4427

  with stored values, e.g. threshold values · CPC title