Pairwise graphical models for structural health monitoring with dense sensor arrays
Name
Pairwise graphical models for structural health monitoring with dense sensor arrays.pdf
Size
12.07 MB
Format
Adobe PDF
Checksum (MD5)
79b50320a6ffca9b678eeb4c55a4049d
Author(s)
Mohammadi Ghazi Mahalleh, Reza
Chen, Justin G.
Buyukozturk, Oral
Date Issued
February 2017
Journal
Mechanical Systems and Signal Processing
Publisher
Elsevier BV
Citation
Mohammadi Ghazi, Reza et al. "Pairwise graphical models for structural health monitoring with dense sensor arrays." Mechanical Systems and Signal Processing 93 (September 2017): 578-592 © 2017 Elsevier
Version
Original manuscript
Abstract
Through advances in sensor technology and development of camera-based measurement techniques, it has become affordable to obtain high spatial resolution data from structures. Although measured datasets become more informative by increasing the number of sensors, the spatial dependencies between sensor data are increased at the same time. Therefore, appropriate data analysis techniques are needed to handle the inference problem in presence of these dependencies. In this paper, we propose a novel approach that uses graphical models (GM) for considering the spatial dependencies between sensor measurements in dense sensor networks or arrays to improve damage localization accuracy in structural health monitoring (SHM) application. Because there are always unobserved damaged states in this application, the available information is insufficient for learning the GMs. To overcome this challenge, we propose an approximated model that uses the mutual information between sensor measurements to learn the GMs. The study is backed by experimental validation of the method on two test structures. The first is a three-story two-bay steel model structure that is instrumented by MEMS accelerometers. The second experimental setup consists of a plate structure and a video camera to measure the displacement field of the plate. Our results show that considering the spatial dependencies by the proposed algorithm can significantly improve damage localization accuracy. Keywords: Structural health monitoring; Damage detection; Graphical models; Ising model; Pairwise graphical model; Sensor network; Video camera; Loopy belief propagation; Gibbs sampling
MIT Department
Massachusetts Institute of Technology. Department of Civil and Environmental Engineering
Terms of Use
Creative Commons Attribution-NonCommercial-NoDerivs License
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1016/j.ymssp.2017.02.026
