Electromechanical Impedance Modeling

Zagrai, Andrei; Giurgiutiu, Victor

doi:10.1002/9780470061626.shm003

Cited by 7 publications

(7 citation statements)

References 16 publications

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“…This causes high frequency modeling using FEM to be prohibitively expensive. Some researchers have used FEM as the basis for modeling the impedance method; however, to obtain acceptable results, only relatively low frequencies could be modeled [13,15]. SEM, on the other hand, relies on a frequency dependent dynamic stiffness matrix.…”

Section: Spectral Element Methodsmentioning

confidence: 99%

“…Giurgiutiu and Zagrai [12] developed models for free, fully constrained and elastically constrained piezoelectric patches excited at very high frequencies (up to 1500 kHz). However, the impedance response of the sensors attached to a beam structure was modeled and experimentally verified only up to 30 kHz and later results on plates were only available up to 40 kHz [13]. Cheng and Wang [14] applied the impedance model to multiple PZT actuator driven systems in the bimorph configuration.…”

Section: Impedance-based Health Monitoringmentioning

confidence: 99%

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Circuit Analysis of Impedance-based Health Monitoring of Beams Using Spectral Elements

Peairs

Inman

Park

2007

Structural Health Monitoring

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A model is generally not needed for the basic damage identification problem when using the electromechanical impedance-based method of structural health monitoring (SHM). However, modeling becomes necessary when more information is needed for more complex functions of the SHM system, such as estimation of remaining life. In addition, suitable models would aid in more accurately identifying and locating damage and in designing the SHM system. Since impedance-based SHM relies on high frequency excitation of the structure using piezoelectric patches, finite element modeling may not be computationally efficient. In this study, the spectral element method (SEM) is used in combination with electric circuit analysis for impedance modeling. SEM more accurately models higher frequency vibrations than finite element methods since the mass is modeled exactly and it incorporates higher order models more easily. Simulations of sensor multiplexing, high frequency response, and the inclusion of damage are presented. Experimental verification is also included.

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Section: Spectral Element Methodsmentioning

confidence: 99%

Section: Impedance-based Health Monitoringmentioning

confidence: 99%

Circuit Analysis of Impedance-based Health Monitoring of Beams Using Spectral Elements

Peairs

Inman

Park

2007

Structural Health Monitoring

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“…Changes in the structure's mechanical impedance due to a failure lead to a modification of the signal (electric impedance) issued by PZT patches coupled to the structure, whose signal is measured within a frequency range. Changes in the structural conditions are identified through comparison between impedance signatures before and after a failure occurrence [4,[28][29][30][31][32].…”

Section: Shm Based On Electromechanical Impedancementioning

confidence: 99%

Indicator kriging for damage position prediction by the use of electromechanical impedance-based structural health monitoring

Gonçalves¹,

Moura²,

Pereira³

et al. 2021

Comptes Rendus. Mécanique

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Some nondestructive techniques of the Structural Health Monitoring (SHM) have improved their analysis in the past decades. Among them, the electromechanical impedance-based SHM technique (EMI-SHM) has been tested in several fields and associated to different statistical methodologies. Considering the nature of the spatial variation of the damage metric data along structures, herein is proposed the use of the indicator kriging method for predicting the existence of a known damage located in the center of an aluminum plate. Maps showing the probability of the damage metric to fall in several value ranges were capable of outlining the areas affected by the damage and predict its location. Comparisons between scenarios with different spacing between PZT patches showed a reduction in the reliability of the model with the increasing of such spacing. Also, for the structure under study, it demonstrates that it is not possible to obtain results by the methodology for distance between sensors/actuators greater than 16.67 cm. However, the results show that this approach can be a viable alternative for using damage metrics to map regions affected by damage and its location.

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“…In the aforementioned methods, piezoelectric sensors are bonded or imbedded in a structure, and a mechanical wave is sent through the material that allows for the inferring of structural dynamic characteristics that, due to the direct piezoelectric effect, are reflected in electromechanical signature of a piezoelectric sensor. If material or structural damage is present, there will be a change in the elastic wave and structural dynamics signatures, and hence, in the impedance measured by piezoelectric sensor [16]. If piezoelectric sensors are considered for operation in radiation environments, then understanding the effects of radiation on piezoelectric ceramics is imperative.…”

Section: Radiation Effects On Piezoelectric Ceramic Sensorsmentioning

confidence: 99%

Investigating Effect of Space Radiation Environment on Piezoelectric Sensors: Cobalt-60 Irradiation Experiment

Anderson

Zagrai

Daniel³

et al. 2017

Journal of Nondestructive Evaluation, Diagnostics and Prognostics of Engineering Systems

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Piezoelectric sensors are used in many structural health monitoring (SHM) methods to interrogate the condition of the structure to which the sensors are affixed or embedded. Among SHM methods utilizing thin wafer piezoelectric sensors, embedded ultrasonics is seen as a promising approach to assess condition of space structures. If SHM is to be implemented in space vehicles, it is imperative to determine the effects of the extreme space environment on piezoelectric sensors in order to discern between actual structural damage and environmental effects. The near-Earth space environment comprises extreme temperatures, vacuum, atomic oxygen, microgravity, micrometeoroids and debris, and significant amounts of radiation. Gamma radiation can be used to emulate the space radiation environment. In this contribution, the effects of gamma radiation on piezoelectric ceramic sensors are investigated for equivalent gamma radiation exposure of more than a year on low Earth orbit (LEO). Two experiments were conducted in which cobalt-60 was utilized as the source of radiation. Freely supported piezoelectric sensors were exposed to increasing levels of gamma radiation. Impedance data were collected for the sensors after each radiation exposure. The results show that piezoelectric ceramic material is affected by gamma radiation. Over the course of increasing exposure levels to cobalt-60, the impedance frequencies of the free sensors increased with each absorbed dose. The authors propose that the mechanism causing these impedance changes is due to gamma rays affecting piezoelectric, electric, and elastic constants of the piezoelectric ceramic. A theoretical model describing observed effects is presented.

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Electromechanical Impedance Modeling

Cited by 7 publications

References 16 publications

Circuit Analysis of Impedance-based Health Monitoring of Beams Using Spectral Elements

Circuit Analysis of Impedance-based Health Monitoring of Beams Using Spectral Elements

Indicator kriging for damage position prediction by the use of electromechanical impedance-based structural health monitoring

Investigating Effect of Space Radiation Environment on Piezoelectric Sensors: Cobalt-60 Irradiation Experiment

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