Damage Detection Based on Electromechanical Impedance Principle and Principal Components

• Autor(a) principal: de Oliveira, Mario Anderson [UNESP]
• Data de Publicação: 2014
• Outros Autores: Vieira Filho, Jozué [UNESP], Lopes Jr., Vicente [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/10.1007/978-1-4614-6585-0_28; http://hdl.handle.net/11449/76925
• topic: Damage detection; Electromechanical impedance; Principal component coefficients; SHM; Time-domain analysis; Frequency response functions; Lead zirconate titanate; Principal Components; Structural health monitoring (SHM); Time-domain approach; Typical application; Frequency response; Modal analysis; Principal component analysis; Semiconducting lead compounds; Structural dynamics; Structural health monitoring; Transducers; Time domain analysis

This paper presents a novel time domain approach for Structural Health Monitoring (SHM) systems based on Electromechanical Impedance (EMI) principle and Principal Component Coefficients (PCC), also known as loadings. Differently of typical applications of EMI applied to SHM, which are based on computing the Frequency Response Function (FRF), in this work the procedure is based on the EMI principle but all analysis is conducted directly in time-domain. For this, the PCC are computed from the time response of PZT (Lead Zirconate Titanate) transducers bonded to the monitored structure, which act as actuator and sensor at the same time. The procedure is carried out exciting the PZT transducers using a wide band chirp signal and getting their time responses. The PCC are obtained in both healthy and damaged conditions and used to compute statistics indexes. Tests were carried out on an aircraft aluminum plate and the results have demonstrated the effectiveness of the proposed method making it an excellent approach for SHM applications. Finally, the results using EMI signals in both frequency and time responses are obtained and compared. © The Society for Experimental Mechanics 2014.