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A Shannon entropy approach for structural damage identification based on self-powered sensor data

Citation

Mousavi, M and Holloway, D and Olivier, JC and Alavi, AH and Gandomi, AH, A Shannon entropy approach for structural damage identification based on self-powered sensor data, Engineering Structures, 200 Article 109619. ISSN 0141-0296 (2019) [Refereed Article]

Copyright Statement

Copyright 2019 Elsevier Ltd.

DOI: doi:10.1016/j.engstruct.2019.109619

Abstract

Piezo-floating-gate (PFG) sensors are a class of self-powered sensors fabricated using piezoelectric transducers and p-channel floating-gate metal-oxide-semiconductor (pMOS) transistors. These sensors are equipped with a series of floating-gates that are triggered when the voltage generated by the piezoelectric transducers exceeds one of the specified thresholds. Upon activation, the floating-gates cumulatively store the duration of the applied strain events. Defining optimal voltage thresholds plays a key role in the efficiency of the PFG sensors for structural damage identification. In this paper, symbolic dynamic analysis (SDA) based on Shannon entropy is used to find the effective voltage thresholds that ensure the maximum detectability of the structural damagerelated changes. To this end, a baseline is constructed using the strain data obtained from the undamaged structure. These data are used to set the voltage threshold on every floating gate of the sensor. Then the posterior state of the structure is monitored using thresholds set up on the baseline and a cumulative density function (CDF) of strain events. In order to determine the damage severity, a damage index is defined based on the Euclidean norm of the distance between the CDFs for the damaged and healthy structure. The proposed technique is verified using experimental data for a steel plate subjected to an in-plane tension loading. The results confirm the capability of the proposed method in monitoring structures for damage initiation and/or propagation using the PFG sensors, and the CDFs on which the damage sensitive feature (DSF) is based can provide additional insights into the stress distributions.

Item Details

Item Type:Refereed Article
Keywords:Shannon entropy, symbolic dynamic analysis, self-powered sensors, wireless damage detection, strain events, structural health monitoring
Research Division:Engineering
Research Group:Civil Engineering
Research Field:Structural Engineering
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in Engineering
UTAS Author:Mousavi, M (Mr Mohsen Mousavimirkalaei)
UTAS Author:Holloway, D (Associate Professor Damien Holloway)
UTAS Author:Olivier, JC (Professor JC Olivier)
ID Code:135525
Year Published:2019
Deposited By:Engineering
Deposited On:2019-10-29
Last Modified:2019-12-12
Downloads:0

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