Title :
Optimal Frequency Range Selection for PZT Transducers in Impedance-Based SHM Systems
Author :
Baptista, Fabricio Guimarães ; Filho, Jozue Vieira
Author_Institution :
Dept. of Electr. Eng., Sao Paulo State Univ. (UNESP), Ilha Solteira, Brazil
Abstract :
Piezoelectric transducers of PZT (lead zirconate titanate) have been widely used in structural health monitoring (SHM) systems based on the electromechanical (E/M) impedance technique. In this technique, damages in the structure are identified by measuring the electrical impedance of the transducer in an appropriate frequency range. Usually, the selection of the correct frequency range to detect and evaluate damage is obtained by trial and error methods. In this paper, it is proposed a formal procedure to determine the frequency ranges in which the PZT transducers are more sensitive for damage detection. Tests were carried out on specimens with different sizes and there was a good match between the theoretical and practical results.
Keywords :
condition monitoring; electric impedance measurement; piezoelectric transducers; structural engineering; PZT; SHM systems; electromechanical impedance technique; frequency range selection; piezoelectric transducers; structural health monitoring; Aluminum; Brazil Council; Electric variables measurement; Electromagnetic interference; Frequency measurement; Impedance measurement; Monitoring; Piezoelectric transducers; Testing; Titanium compounds; Frequency; impedance; lead zirconate titanate (PZT) ceramics; structural engineering;
Journal_Title :
Sensors Journal, IEEE
DOI :
10.1109/JSEN.2010.2044037