Optimal Frequency Range Selection for PZT Transducers in Impedance-Based SHM Systems

Piezoelectric Transducers Assessed by the Pencil Lead Break for Impedance-Based Structural Health Monitoring

“…However, as proposed in a previous study [19], if the patch is sufficiently thin and the propagation medium has a low damping coefficient, as occurs with metal structures, a one-dimensional model may be satisfactory. In the current study, we adopt a one-dimensional model, which, for a patch of PZT material, can be expressed as follows in terms of the electrical impedance [19] …”

Sizing PZT Transducers in Impedance-Based Structural Health Monitoring

“…From methodology proposed in [14] for selecting a suitable frequency range, it was determined that the range around 0-50 kHz provides high sensitivity. However, in the audio frequency ranging from 0 to 15 kHz the system may be more susceptible to environment noise, such as acoustic vibrations, and this range should be avoided.…”

“…Thus, the ratios for the both specimens using a small 5H PZT patch of 10 mm 10 mm 0.267 mm can be determined, as shown in Fig. 8, considering the transducer operating at 10 kHz, which is within the range of 0-50 kHz that is appropriate for damage detection in general applications [14], although other ranges may be required for specific applications.…”

“…These indexes should be calculated within an appropriate frequency range, which provides good sensitivity for damage detection. Generally, the suitable frequency range is selected experimentally by trial and error methods, but recently some researchers have proposed more efficient methodologies [13], [14].…”

Técnicas para monitoramento de integridade estrutural usando sensores e atuadores piezoelétricos

“…O procedimento torna possível a utilização da parte imaginária tão bem quanto à parte real, maximizando as informações sobre a condição da estrutura. Baptista e Filho [3] propuseram um procedimento para determinar as faixas de freqüência em que os transdutores piezoelétricos são mais sensíveis para detecção de danos.…”