Modeling, Simulation, Experimentation, and Compensation of Temperature Effect in Impedance-Based SHM Systems Applied to Steel Pipes

Antunes, Rothschild Alencastro; Cortez, Nicolás E.; Gianesini, Bárbara Morais; Filho, Jozué Vieira

doi:10.3390/s19122802

Cited by 24 publications

(14 citation statements)

References 34 publications

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“…It is necessary to develop more robust SHM methods and systems with the capability of quick local damage assessment 6–8 . Emerging approaches include visual inspection, 9–11 laser scanning, 12,13 impedance method, 14–16 and ultrasonic technique 17–21 . Among them, the ultrasonic guided wave method has been recognized as one of the efficient nondestructive testing (NDT) approaches to scan long structural members.…”

Section: Introductionmentioning

confidence: 99%

Guided wave‐based damage assessment on welded steel I‐beam under ambient temperature variations

Tang

Yun

et al. 2021

Struct Control Health Monit

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Summary Welded steel I‐beams are widely used in civil infrastructures and industrial facilities as the major load‐carrying members. The fillet weld zone, which connects the web plate and flange plate, is vulnerable to defects and fatigue cracks during the long service life, which may result in catastrophic accidents. In this study, a guided wave‐based damage assessment method is presented to monitor the weld zone of a steel I‐beam under ambient temperature variations. The semi‐analytical finite element (SAFE) analysis was performed to investigate the characteristics of guided wave propagation in a welded I‐beam. A signal‐processing procedure that incorporates the principal component analysis (PCA) and independent component analysis (ICA) was proposed for damage assessment. The PCA was performed to identify and eliminate significant environmental effects from the guided wave signals. Reconstructed residual signals were obtained from the PCA for damage detection. The ICA was performed to improve the damage localization by identifying the wave packets that are closely related to the occurrence of damage. Lab‐scale experiments were performed on a steel I‐beam under various ambient temperatures. The results show that the inflicted cuts on the weld line have been successfully detected. The damage severity can be qualitatively evaluated based on the magnitudes of Q‐statistics through the PCA. The results of the damage localization can be effectively improved by incorporating the ICA‐based signal decomposition.

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Section: Introductionmentioning

confidence: 99%

Guided wave‐based damage assessment on welded steel I‐beam under ambient temperature variations

Tang

Yun

et al. 2021

Struct Control Health Monit

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“…Sensor readings are processed and analyzed according to the applied SHM method [ 3 ]. Examples of state-of-the-art monitoring methods are guided waves [ 4 , 5 , 6 , 7 ], conductive surface layers [ 8 , 9 , 10 ], direct measurements of the electrical impedance of a structure [ 11 ] and the electro-mechanical impedance (EMI) method [ 12 , 13 , 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

Crack Identification in Necked Double Shear Lugs by Means of the Electro-Mechanical Impedance Method

Winklberger

Kralovec

Humer

et al. 2020

Sensors

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This contribution investigates fatigue crack detection, localization and quantification in idealized necked double shear lugs using piezoelectric transducers attached to the lug shaft and analyzed by the electro-mechanical impedance (EMI) method. The considered idealized necked lug sample has a simplified geometry and does not includes the typical bearing. Numerical simulations with coupled-field finite element (FE) models are used to study the frequency response behavior of necked lugs. These numerical analyses include both pristine and cracked lug models. Through-cracks are located at 90∘ and 145∘ to the lug axis, which are critical spots for damage initiation. The results of FE simulations with a crack location at 90∘ are validated with experiments using an impedance analyzer and a scanning laser Doppler vibrometer. For both experiments, the lug specimen is excited and measured using a piezoelectric active wafer sensor in a frequency range of 1 kHz to 100 kHz. The dynamic response of both numerical calculations and experimental measurements show good agreement. To identify (i.e., detect, locate, and quantify) cracks in necked lugs a two-step analysis is performed. In the first step, a crack is detected data-based by calculating damage metrics between pristine and damaged state frequency spectra and comparing the resulting values to a pre-defined threshold. In the second step the location and size of the detected crack is identified by evaluation of specific resonance frequency shifts of the necked lug. Both the search for frequencies sensitive to through-cracks that allow a distinction between the two critical locations and the evaluation of the crack size are model-based. This two-step analysis based on the EMI method is demonstrated experimentally at the considered idealized necked lug, and thus, represents a promising way to reliably detect, locate and quantify fatigue cracks at critical locations of real necked double shear lugs.

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“…Techniques with this characteristic, also called nondestructive testing (NDT), include acoustic emission [3], Lamb waves [4], [5], eddy currents [6] and guided ultrasonic waves [7]. In addition, the electromechanical impedance (EMI) technique [8], [9] stands out because it enables the use of low-cost, small and light piezoelectric transducers operating simultaneously as sensor and actuator, minimally interfering with the characteristics of the monitored structure [10].…”

Section: Introductionmentioning

confidence: 99%

Sensitivity Enhancement of Piezoelectric Transducers for Impedance-Based Damage Detection via a Negative Capacitance Interface

2020

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Piezoelectric transducers are used in many applications due to electromechanical coupling, which allows mechanical and electrical quantities to be related. This principle is used in the development of structural damage detection techniques such as electromechanical impedance (EMI) commonly used in structural health monitoring (SHM), where structural health is monitored by measuring and analyzing the electrical impedance of a transducer. As a piezoelectric transducer is a primarily capacitive device, its reactance becomes small at high frequencies, reducing sensitivity to structural damage and increasing the excitation current required from the measuring system. Therefore, this paper proposes the use of a negative capacitance (NC) interface with the transducer to improve sensitivity to structural damage and reduce the excitation current. The improvement obtained with the NC interface is theoretically analyzed using an electromechanical model and experimentally validated with tests on an aluminum structure. The results conclusively indicate a significant improvement in the sensitivity to structural damage and a reduction in excitation current, which are critical for detecting incipient damage and developing onboard monitoring systems where the output current drive is usually low.

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Modeling, Simulation, Experimentation, and Compensation of Temperature Effect in Impedance-Based SHM Systems Applied to Steel Pipes

Cited by 24 publications

References 34 publications

Guided wave‐based damage assessment on welded steel I‐beam under ambient temperature variations

Guided wave‐based damage assessment on welded steel I‐beam under ambient temperature variations

Crack Identification in Necked Double Shear Lugs by Means of the Electro-Mechanical Impedance Method

Sensitivity Enhancement of Piezoelectric Transducers for Impedance-Based Damage Detection via a Negative Capacitance Interface

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