Detection, monitoring, and determination of location of changes in metallic structures using multimode acoustic signals
Abstract
Acoustic transducers generate and receive acoustic signals at multiple locations along a surface of rigid structure, wherein longitudinal spacing between transducer locations define measurement zones. Acoustic signals with chosen amplitude-time-frequency characteristics excite multiple vibration modes in the structure within each zone. Small mechanical changes in inspection zones lead to scattering and attenuation of broadband acoustic signals, which are detectable as changes in received signal characteristics as part of a through-transmission technique. Additional use of short, narrowband pulse acoustic signals as part of a pulse-echo technique allows determination of the relative location of the mechanical change within each zone based on the differential delay profiles. For accurate acoustic modeling and simulation, the mesh size, time step, time delay, and time-window size are optimized. Frequency normalization of the Short-Time Fourier Transform of acoustic response output improves experiment-simulation cross-validation. Applications of the method to structures with arbitrarily complex geometries are also demonstrated.
- Inventors:
- Issue Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Chevron U.S.A. Inc., San Ramon, CA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1823925
- Patent Number(s):
- 10996203
- Application Number:
- 16/800,661
- Assignee:
- Triad National Security, LLC (Los Alamos, NM); Chevron U.S.A. Inc. (San Ramon, CA)
- Patent Classifications (CPCs):
-
G - PHYSICS G01 - MEASURING G01N - INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- DOE Contract Number:
- 89233218CNA000001
- Resource Type:
- Patent
- Resource Relation:
- Patent File Date: 02/25/2020
- Country of Publication:
- United States
- Language:
- English
Citation Formats
Findikoglu, Alp Tugrul, Ju, Taeho, and Chapman, Daniel Robert. Detection, monitoring, and determination of location of changes in metallic structures using multimode acoustic signals. United States: N. p., 2021.
Web.
Findikoglu, Alp Tugrul, Ju, Taeho, & Chapman, Daniel Robert. Detection, monitoring, and determination of location of changes in metallic structures using multimode acoustic signals. United States.
Findikoglu, Alp Tugrul, Ju, Taeho, and Chapman, Daniel Robert. Tue .
"Detection, monitoring, and determination of location of changes in metallic structures using multimode acoustic signals". United States. https://www.osti.gov/servlets/purl/1823925.
@article{osti_1823925,
title = {Detection, monitoring, and determination of location of changes in metallic structures using multimode acoustic signals},
author = {Findikoglu, Alp Tugrul and Ju, Taeho and Chapman, Daniel Robert},
abstractNote = {Acoustic transducers generate and receive acoustic signals at multiple locations along a surface of rigid structure, wherein longitudinal spacing between transducer locations define measurement zones. Acoustic signals with chosen amplitude-time-frequency characteristics excite multiple vibration modes in the structure within each zone. Small mechanical changes in inspection zones lead to scattering and attenuation of broadband acoustic signals, which are detectable as changes in received signal characteristics as part of a through-transmission technique. Additional use of short, narrowband pulse acoustic signals as part of a pulse-echo technique allows determination of the relative location of the mechanical change within each zone based on the differential delay profiles. For accurate acoustic modeling and simulation, the mesh size, time step, time delay, and time-window size are optimized. Frequency normalization of the Short-Time Fourier Transform of acoustic response output improves experiment-simulation cross-validation. Applications of the method to structures with arbitrarily complex geometries are also demonstrated.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2021},
month = {5}
}
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