Active Wireless System for Structural Health Monitoring Applications

Nguyen

et al. 2020

Sensors

For a structural health monitoring (SHM) system, the operational functionality of sensors is critical for successful implementation of a damage identification process. This study presents experimental and analytical investigations on sensor fault diagnosis for impedance-based SHM using the piezoelectric interface technique. Firstly, the piezoelectric interface-based impedance monitoring is experimentally conducted on a steel bolted connection to investigate the effect of structural damage and sensor defect on electromechanical (EM) impedance responses. Based on the experimental analysis, sensor diagnostic approaches using EM impedance features are designed to distinguish the sensor defect from the structural damage. Next, a novel impedance model of the piezoelectric interface-driven system is proposed for the analytical investigation of sensor fault diagnosis. Various parameters are introduced into the EM impedance formulation to model the effect of shear-lag phenomenon, sensor breakage, sensor debonding, and structural damage. Finally, the proposed impedance model is used to analytically estimate the change in EM impedance responses induced by the structural damage and the sensor defect. The analytical results are found to be consistent with experimental observations, thus evidencing the feasibility of the novel impedance model for sensor diagnosis and structural integrity assessment. The study is expected to provide theoretical and experimental foundations for impedance monitoring practices, using the piezoelectric interface technique, with the existence of sensor faults.

Section: Introductionmentioning

confidence: 99%

Sensor Fault Diagnosis for Impedance Monitoring Using a Piezoelectric-Based Smart Interface Technique

Nguyen

et al. 2020

Sensors

“…The coupling between the PZT interface and the splice plate opens a potentiality to assess multiple loosened bolts on the splice plate. The flexible section of the PZT interface allows for predetermining the sensitive frequency band of impedance signals below 100 kHz, and thus enabling the use of a low-cost wireless impedance measurement system [ 22 , 27 , 28 ].…”

Section: Piezoelectric-based Smart Interface For Bolted Connectionmentioning

confidence: 99%

Preload Monitoring in Bolted Connection Using Piezoelectric-Based Smart Interface

Dang

Kim

2018

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.

“…The coupling between the PZT interface and the splice plate opens a potentiality to assess multiple loosened bolts on the splice plate. The flexible section of the PZT interface allows to predetermine the sensitive frequency band of impedance signals below 100 kHz, and thus enabling the use of a low-cost wireless impedance measurement system [22,27,28].…”

Section: Piezoelectric-based Smart Interface Techniquementioning

confidence: 99%

Preload Monitoring in Bolted Connection Using Piezoelectric-Based Smart Interface

Dang

Kim

2018

Preprint

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 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 mechanistic understanding of 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 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.