Journal
SENSORS
Volume 17, Issue 2, Pages -Publisher
MDPI
DOI: 10.3390/s17020417
Keywords
piezoelectric; sensors; active system; data fusion; machine learning; damage classification
Funding
- Spanish Ministry of Economy and Competitiveness [DPI2014-58427-C2-1-R]
- Catalan Government (Generalitat de Catalunya) [2014 SGR 859]
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Civil and military structures are susceptible and vulnerable to damage due to the environmental and operational conditions. Therefore, the implementation of technology to provide robust solutions in damage identification (by using signals acquired directly from the structure) is a requirement to reduce operational and maintenance costs. In this sense, the use of sensors permanently attached to the structures has demonstrated a great versatility and benefit since the inspection system can be automated. This automation is carried out with signal processing tasks with the aim of a pattern recognition analysis. This work presents the detailed description of a structural health monitoring (SHM) system based on the use of a piezoelectric (PZT) active system. The SHM system includes: (i) the use of a piezoelectric sensor network to excite the structure and collect the measured dynamic response, in several actuation phases; (ii) data organization; (iii) advanced signal processing techniques to define the feature vectors; and finally; (iv) the nearest neighbor algorithm as a machine learning approach to classify different kinds of damage. A description of the experimental setup, the experimental validation and a discussion of the results from two different structures are included and analyzed.
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