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Research Article

JCR. 2020; 7(19): 7359-7366


T Jayachitra, Rashmi Priyadarshini.

Monitoring of structural health in civil and mechanical structures plays a vital role in recent
days. Civil structures must be monitored continuously for safety and maintenance along with repair to be
done accordingly. The most promising method on structural health monitoring is Electromechanical
Impedance method. Smart material like piezoelectric transducer (lead zirconate titanate) is either
embedded or bonded on the structure which is to be monitored. When sinusoidal input excitation signal is
given to piezo sensor, it senses, calibrates and measures the changes in parameters (cracks, corrosion
stress) at crucial locations. Data acquisition using Impedance Analyzers/LCR meter was limited due its
high cost in real time applications. This article presents the qualitative analysis of structural health
monitoring by using electromechanical impedance and admittance measurements of different structures.
The paper also reviews structural health monitoring technologies, different structures and sensors used.
Analysis is made on different methods used for Structural Health Monitoring. Experiments are conducted
on stainless steel, concrete beam and Galvanized Iron pipe, surface bonded with piezoelectric transducer
for qualitative analysis for impedance and admittance measurements. The Impedance and admittance are
measured using Impedance chip, Direct Digital synthesizer and LCR meter. Admittance value decreases
and impedance value increases when the damage level is high.

Key words: Structural Health Monitoring, Electromechanical Impedance, Piezo electric transducer, Impedance Analyzer, Impedance chip, Direct Digital Synthesizer

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