Proof-of-Concept Studies in Novel Guided Wave Methods for Metallic Structural Condition

reportActive / Technical Report | Accession Number: ADA500515 | Open PDF

Abstract:

Active sensing in structural health monitoring SHM refers to injecting user-defined energy into the system in order to actively probe its response to the induced dynamics as a means of detecting whether damage may be present in the system. A number of researchers have shown that active sensing with guided ultrasonic waves GUWs can be a powerful approach to take, as GUWs, when launched and detected in conjunction with macro-fiber composite MFC patches, can retain the wide area coverage capability of lower frequency vibration methods while significantly enhancing sensitivity to flaws cracks, corrosion, etc. because of the small interrogating wavelengths used. This project, led by PI Michael Todd and Co-PI Francesco Lanza di Scalea, considered several new concepts in guided GUWs 1 optimized passive GUWs, 2 quantitative active GUWs, and 3 a generalized insonification diffuse field approach rooted in data-based modeling and pattern recognition. These concepts are tested on metallic test articles to detect a variety of defects, including impact damage, simulated cracks notching, corrosion, and bolted joint preload loss.

Author(s):
Todd, Michael ; Lanza Di Scalea, Francesco
Author Organization(s):
CALIFORNIA UNIV SAN DIEGO LA JOLLA
Descriptive Note:
Final technical rept.
Supplementary Note:
The original document contains color images. All DTIC reproductions will be in black and white. DOI: 10.21236/ADA500515
Pagination:
0040

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release
Distribution Statement:
Approved For Public Release; Distribution Is Unlimited.

RECORD

Collection: TR
Identifying Numbers
Contract/Grant Number(s):
N00014-08-1-0973
Monitor Series:
ONR
 Subject Terms
Joint Capability Areas:
JCA_5_Command and Control; JCA_5.3_Planning; JCA_1.2.7_Experimentation; JCA_1.2.1_Training; JCA_1.3.2_Personnel Management; JCA_1.2.6_Concepts; JCA_1.2.3_Educating; JCA_4.5_Operational Contract Support; JCA_4.6_Engineering; JCA_5.2.2_Develop Knowledge and Situational Awareness; JCA_5.2_Understand
Modernization Areas:
Microelectronics; Quantum Science and Computing; AI and Machine Learning
Communities of Interest:
Sensors
Descriptor(s):
*WAVE PROPAGATION, OPTIMIZATION, CORROSION, MODELS, SHORT WAVELENGTHS, PASSIVE SYSTEMS, SENSITIVITY, PATTERN RECOGNITION, VIBRATION, CRACKS
Field(s)/Group(s):
Cybernetics, Optics
Keyword(s):
GUWS(GUIDED ULTRASONIC WAVES), INSONIFICATION, *STRUCTURAL HEALTH MONITORING, *PROOF OF CONCEPT
Report Date:
2009 Mar 01
Creation Date:
2009 Jul 01