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Preload Monitoring in Bolted Connection Using Piezoelectric-Based Smart Interface

Department of Ocean Engineering, Pukyong National University, Busan 48723, Korea
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Author to whom correspondence should be addressed.
Sensors 2018, 18(9), 2766; https://doi.org/10.3390/s18092766
Received: 2 August 2018 / Revised: 17 August 2018 / Accepted: 21 August 2018 / Published: 22 August 2018
(This article belongs to the Section Physical Sensors)
In this study, a preload monitoring method using impedance signatures obtained from a piezoelectric-based smart interface is presented for bolted girder connections. Firstly, the background theory of the piezoelectric-based smart interface and its implementation into the health monitoring of bolted connections are outlined. A simplified electro-mechanical (EM) impedance model of a smart interface-embedded bolted connection system is formulated to interpret a mechanistic understanding of the EM impedance signatures under the effect of bolt preload. Secondly, finite element modeling of a bolted connection is carried out to show the numerical feasibility of the presented method, and to predetermine the sensitive frequency band of the impedance signatures. Finally, impedance measurements are conducted on a lab-scaled bolted girder connection, to verify the predetermined sensitive frequency range and to assess the bolt preload changes in the test structure. View Full-Text
Keywords: preload monitoring; bolted connection; bolt-loosening; piezoelectric sensor; impedance response; smart interface preload monitoring; bolted connection; bolt-loosening; piezoelectric sensor; impedance response; smart interface
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Huynh, T.-C.; Dang, N.-L.; Kim, J.-T. Preload Monitoring in Bolted Connection Using Piezoelectric-Based Smart Interface. Sensors 2018, 18, 2766.

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