A new microcontrolled structural health monitoring system based on the electromechanical impedance principle
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Data
2013-01-01
Autores
Cortez, Nicolás E.
Vieira Filho, Jozué [UNESP]
Baptista, Fabricio G. [UNESP]
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Resumo
This article presents a new method to detect damage in structures based on the electromechanical impedance principle. The system follows the variations in the output voltage of piezoelectric transducers and does not compute the impedance itself. The proposed system is portable, autonomous, versatile, and could efficiently replace commercial instruments in different structural health monitoring applications. The identification of damage is performed by simply comparing the variations of root mean square voltage from response signals of piezoelectric transducers, such as lead zirconate titanate patches bonded to the structure, obtained for different frequencies of the excitation signal. The proposed system is not limited by the sampling rate of analog-to-digital converters, dispenses Fourier transform algorithms, and does not require a computer for processing, operating autonomously. A low-cost prototype based on microcontroller and digital synthesizer was built, and experiments were carried out on an aluminum structure and excellent results have been obtained. © The Author(s) 2012.
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direct digital synthesizer, electromechanical impedance, measurement instruments, microcontroller, piezoelectric transducers, Structural health monitoring, Aluminum structures, Analog to digital converters, Commercial instruments, Different frequency, Digital synthesizers, Direct digital synthesizer, Electromechanical impedance, Excitation signals, Fourier transform algorithms, Lead zirconate titanate, Measurement instruments, Output voltages, Response signal, Root Mean Square, Sampling rates, Structural health, Structural health monitoring systems, Damage detection, Microcontrollers, Piezoelectric transducers, Semiconducting lead compounds, Computer operating systems
Como citar
Structural Health Monitoring, v. 12, n. 1, p. 14-22, 2013.