NDLI: Sensitivity of PZT Impedance Sensors for Damage Detection of Concrete Structures

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Sensitivity of PZT Impedance Sensors for Damage Detection of Concrete Structures

Content Provider	MDPI
Author	Yang, Yaowen Hu, Yuhang Lu, Yong
Abstract	Piezoelectric ceramic Lead Zirconate Titanate (PZT) based electro-mechanicalimpedance (EMI) technique for structural health monitoring (SHM) has been successfullyapplied to various engineering systems. However, fundamental research work on thesensitivity of the PZT impedance sensors for damage detection is still in need. In thetraditional EMI method, the PZT electro-mechanical (EM) admittance (inverse of theimpedance) is used as damage indicator, which is difficult to specify the effect of damage onstructural properties. This paper uses the structural mechanical impedance (SMI) extractedfrom the PZT EM admittance signature as the damage indicator. A comparison study on thesensitivity of the EM admittance and the structural mechanical impedance to the damages ina concrete structure is conducted. Results show that the SMI is more sensitive to the damagethan the EM admittance thus a better indicator for damage detection. Furthermore, this paperproposes a dynamic system consisting of a number of single-degree-of-freedom elementswith mass, spring and damper components to model the SMI. A genetic algorithm isemployed to search for the optimal value of the unknown parameters in the dynamic system.An experiment is carried out on a two-storey concrete frame subjected to base vibrations thatsimulate earthquake. A number of PZT sensors are regularly arrayed and bonded to the framestructure to acquire PZT EM admittance signatures. The relationship between the damageindex and the distance of the PZT sensor from the damage is studied. Consequently, thesensitivity of the PZT sensors is discussed and their sensing region in concrete is derived.
File Size	921600
Ending Page	346
Page Count	20
Starting Page	327
File Format	PDF
e-ISSN	14248220
DOI	10.3390/s8010327
Journal	Sensors
Issue Number	1
Volume Number	8
Language	English
Publisher Date	2008-01-21
Access Restriction	Open
Subject Keyword	PZT structural health monitoring electro-mechanical impedance damage concrete
Content Type	Text
Resource Type	Article

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