Structural diagnostics via anomaly-driven demixing of wavefield data

Jeff Druce, Mojtaba Kadkhodaie, Jarvis D Haupt, Stefano Gonella

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

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 languageEnglish (US)
Title of host publicationStructural Health Monitoring 2015
Subtitle of host publicationSystem Reliability for Verification and Implementation - Proceedings of the 10th International Workshop on Structural Health Monitoring, IWSHM 2015
EditorsFu-Kuo Chang, Fotis Kopsaftopoulos
PublisherDEStech Publications
Pages1236-1242
Number of pages7
ISBN (Electronic)9781605951119
StatePublished - Jan 1 2015
Event10th International Workshop on Structural Health Monitoring: System Reliability for Verification and Implementation, IWSHM 2015 - Stanford, United States
Duration: Sep 1 2015Sep 3 2015

Publication series

NameStructural Health Monitoring 2015: System Reliability for Verification and Implementation - Proceedings of the 10th International Workshop on Structural Health Monitoring, IWSHM 2015
Volume2

Other

Other10th International Workshop on Structural Health Monitoring: System Reliability for Verification and Implementation, IWSHM 2015
CountryUnited States
CityStanford
Period9/1/159/3/15

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