A low-cost electromechanical impedance-based shm architecture for multiplexed piezoceramic actuators

  • Neto R
  • Steffen V
  • Rade D
 et al. 
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The electromechanical impedance (EMI) method has been regarded as a
promising tool for structural health monitoring (SHM) in real time.
Usually, massive, high-cost, single-channel impedance analyzers are used
to process the time domain data, aiming at obtaining the complex,
frequency-dependent, EMI functions, from which features related to the
presence, position, and extent of damage can be extracted. However, for
large structures, it is desirable to deploy an array of piezoelectric
transducers over the area to be monitored and interrogate these
transducers successively so as to increase the probability of successful
detection of damage in an early phase. In this context, a miniaturized,
low-cost, highly expandable SHM architecture for monitoring an array of
multiplexed piezoelectric transducers is proposed. Each logical block of
the proposed architecture is presented in detail. The proposed
architecture does not use costly fast Fourier transform
analyzers/algorithms nor requires a digital computer for processing. A
personal computer is only necessary for user interfacing. It has been
verified that the system can work for frequencies ranging from 0 to 400
kHz with high accuracy and stability. A prototype using inexpensive
integrated circuits and a digital signal processor was built and tested
for two different types of structures: an aluminum beam and an aircraft
aluminum panel. Simulated damages were introduced to each structure and
the detection performance of the prototype was tested. The actual
prototype uses a universal serial bus connection to communicate with a
personal computer; however, a WiFi (R) connection is also available.

Author-supplied keywords

  • DSP
  • electromechanical impedance
  • piezoelectric transducer
  • structural health monitoring

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  • Domingos RadeInstituto Tecnologico de Aeronautica

  • Roberto M. Neto

  • Valder Steffen

  • Carlos A. Gallo

  • Lizeth V. Palomino

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