Temperature effects on electromechanical response of deposited piezoelectric sensors used in structural health monitoring of aerospace structures

Hamidreza Hoshyarmanesh, Mojtaba Ghodsi, Minjae Kim, Hyuang Hee Cho, Hyung-Ho Park*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Abstract

Turbomachine components used in aerospace and power plant applications preferably require continuous structural health monitoring at various temperatures. The structural health of pristine and damaged superalloy compressor blades of a gas turbine engine was monitored using real electro-mechanical impedance of deposited thick film piezoelectric transducers at 20 and 200 C. IVIUM impedance analyzer was implemented in laboratory conditions for damage detection in superalloy blades, while a custom-architected frequency-domain transceiver circuit was used for semi-field circumstances. Recorded electromechanical impedance signals at 20 and 200 C acquired from two piezoelectric wafer active sensors bonded to an aluminum plate, near and far from the damage, were initially utilized for accuracy and reliability verification of the transceiver at temperatures >20 C. Damage formation in both the aluminum plate and blades showed a peak shift in the swept frequency along with an increase in the amplitude and number of impedance peaks. The thermal energy at 200 C, on the other hand, enforces a further subsequent peak shift in the impedance signal to pristine and damaged parts such that the anti-resonance frequency keeps reducing as the temperature increases. The results obtained from the impedance signals of both piezoelectric wafers and piezo-films, revealed that increasing the temperature somewhat decreased the real impedance amplitude and the number of anti-resonance peaks, which is due to an increase in permittivity and capacitance of piezo-sensors. A trend is also presented for artificial intelligence training purposes to distinguish the effect of the temperature versus damage formation in sample turbine compressor blades. Implementation of such a monitoring system provides a distinct advantage to enhance the safety and functionality of critical aerospace components working at high temperatures subjected to crack, wear, hot-corrosion and erosion.
Original languageEnglish
Article number2805
Pages (from-to)1-15
Number of pages15
JournalSensors
Volume19
Issue number12
DOIs
Publication statusPublished - 22 Jun 2019

Keywords

  • piezoelectric sensor
  • lead zirconate titanate/lead zirconate titanate (PZT/PZT)
  • lead zirconate titanate/bismuth titanate (PZT/BiT)
  • temperature effect
  • electromechanical impedance
  • aerospace structure
  • superalloy blade
  • structural health monitoring
  • damage detection

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