Abstract
This work introduces a method for the detection and triangulation of anomalous features in solid media. The strategy leverages an algorithm which demixes the dynamic system response data into two distinct components: the first characterized by spatially sparse, persistent features and the second comprising the relatively large, smooth features of the bulk response. In performing this demixing, we select a topologically suitable basis for each component and we seek an accurate representation of the data in terms of the respective bases. This task is cast in the form of a Group Lasso optimization problem and solved using a Block Coordinate Descent algorithmic approach. The resulting representation distills the signatures of potential anomalies from the bulk dynamic response, thus allowing an effortless determination of their location. The proposed method is baseline free, automated, unsupervised (it makes no use of training sets), and model agnostic (it makes virtually no use of material knowledge or constitutive behavior). These attributes are appealing in systems where there exists limited or unreliable a priori constitutive knowledge of the model, or when the physical domain is highly heterogeneous or compromised by large damage zones. The method is tested against synthetically generated data and experimental data obtained using a scanning laser Doppler vibrometer.
Original language | English (US) |
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Title of host publication | Structural Health Monitoring 2015 |
Subtitle of host publication | System Reliability for Verification and Implementation - Proceedings of the 10th International Workshop on Structural Health Monitoring, IWSHM 2015 |
Editors | Fu-Kuo Chang, Fotis Kopsaftopoulos |
Publisher | DEStech Publications |
Pages | 1236-1242 |
Number of pages | 7 |
ISBN (Electronic) | 9781605951119 |
DOIs | |
State | Published - 2015 |
Event | 10th International Workshop on Structural Health Monitoring: System Reliability for Verification and Implementation, IWSHM 2015 - Stanford, United States Duration: Sep 1 2015 → Sep 3 2015 |
Publication series
Name | Structural Health Monitoring 2015: System Reliability for Verification and Implementation - Proceedings of the 10th International Workshop on Structural Health Monitoring, IWSHM 2015 |
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Volume | 2 |
Other
Other | 10th International Workshop on Structural Health Monitoring: System Reliability for Verification and Implementation, IWSHM 2015 |
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Country/Territory | United States |
City | Stanford |
Period | 9/1/15 → 9/3/15 |
Bibliographical note
Publisher Copyright:Copyright © 2015 by DEStech Publications, Inc. All rights re served.