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A structural impedance measurement method by using polyvinylidene fluoride as actuator and sensor.

Xin Zhang1, Jiawen Xu1, Ruqiang Yan2

  • 1Jiangsu Key Lab of Remote Measurement and Control, School of Instrument Science and Engineering, Southeast University, Jiangsu 210096, China.

The Review of Scientific Instruments
|September 3, 2020
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Summary

This study introduces a new structural impedance measurement method using polyvinylidene fluoride (PVDF) patches as both actuators and sensors. The technique effectively detects structural resonance and identifies damage for enhanced structural health monitoring.

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Structural Health Monitoring

Background:

  • Polyvinylidene fluoride (PVDF) patches are typically used as sensors in structural impedance measurements due to their low Young's modulus and piezoelectric coefficients.
  • Conventional methods face challenges in decoupling structural impedance from transducer capacitance impedance.

Purpose of the Study:

  • To demonstrate a novel method for structural impedance measurement utilizing PVDF patches as both actuators and sensors.
  • To improve the accuracy and effectiveness of structural health monitoring by precisely identifying resonant frequencies and structural conditions.

Main Methods:

  • Employing one PVDF patch as an actuator and another as a sensor to decouple host structure impedance from transducer capacitance.
  • Utilizing phase-sensitive detection to recover weak impedance signals for analysis.
  • Fabricating and testing a prototype system with a metal cantilever and two PVDF patches.

Main Results:

  • The proposed method successfully measured resonant frequencies and identified the health condition of the host structure.
  • Experimental results precisely matched Finite Element Method (FEM) simulations and base-movement excitation tests.
  • Demonstrated the ability to detect mass change-induced impedance shifts.

Conclusions:

  • The novel dual-role PVDF patch method offers a superior approach to conventional impedance-based techniques for structural health monitoring.
  • This technique enhances the precision of resonance detection and damage identification in structures.
  • The method proves effective for real-time structural condition assessment and monitoring.