A PZT-based technique for SHM using the coherence function

• Autor(a) principal: Vieira Filho, Jozué [UNESP]
• Data de Publicação: 2011
• Outros Autores: Baptista, Fabricio Guimarães [UNESP], Inman, Daniel J.
• Tipo de documento: Artigo de conferência
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1007/978-1-4419-9302-1_10; http://hdl.handle.net/11449/72492
• topic: Piezoelectric transducers; PWAS; PZT; Structural health monitoring; Aluminum plates; Coherence function; Host structure; Lamb Wave; Lead zirconate titanate; PZT sensors; Standard deviation; Structural health; Structural health monitoring systems; Wide frequency range; Aerospace applications; Chemical detection; Coherent light; Damage detection; Piezoelectric actuators; Semiconducting lead compounds; Sensors; Signal detection; Statistics; Structural dynamics; Transducers

This paper presents a new approach for damage detection in structural health monitoring systems exploiting the coherence function between the signals from PZT (Lead Zirconate Titanate) transducers bonded to a host structure. The physical configuration of this new approach is similar to the configuration used in Lamb wave based methods, but the analysis and operation are different. A PZT excited by a signal with a wide frequency range acts as an actuator and others PZTs are used as sensors to receive the signal. The coherences between the signals from the PZT sensors are obtained and the standard deviation for each coherence function is computed. It is demonstrated through experimental results that the standard deviation of the coherence between the signals from the PZTs in healthy and damaged conditions is a very sensitive metric index to detect damage. Tests were carried out on an aluminum plate and the results show that the proposed methodology could be an excellent approach for structural health monitoring (SHM) applications.