Piezoelectric wafer active sensor embedded ultrasonics in beams and plates

Giurgiutiu, Victor; Bao, J.; Zhao, Wei

doi:10.1007/bf02411348

Cited by 115 publications

(74 citation statements)

References 21 publications

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“…As suggested by Giurgiutiu,12 damage detection should be carried out at the centre frequency where the peak wave amplitude ratio between the S 0 mode and the A 0 mode is maximum.…”

Section: Selection Of Excitation Frequencymentioning

confidence: 99%

“…The study by Giurgiutiu,12 showed that when the diameter of PZT actuator is equal to odd integer multiples of half wavelength of the particular Lamb mode, strong voltage response for the corresponding Lamb mode will be produced; however, when the diameter of PZT actuator is equal to even integer multiples of half wavelength of Lamb modes, very weak voltage response will be generated.…”

Section: Selection Of Excitation Frequencymentioning

confidence: 99%

“…13 and 14. The 3-D FE simulations are carried out for 8.5 cycles, 10 volt, from peak to peak, Gaussian input signal having central frequencies of 204 kHz and 85 kHz, which are the 'sweet spot' frequencies, 12 as shown in Figs. 15 and 16.…”

Section: Finite Element Simulationmentioning

confidence: 99%

“…12 Finally, Gangadharan et al proposed a geodesic-based approach using Lamb wave to locate a damage in an isotropic metallic plate. 1 The studies presented in this literature 1 mainly focused on locating individual damage, and no FE simulation was carried out for locating them.…”

Section: Introductionmentioning

confidence: 99%

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Lamb Wave Based Experimental and Finite Element Simulation Studies for Damage Detection in an Aluminium and a Composite Plate using Geodesic Algorithm

Masurkar¹,

Yelve²

2017

IJAV

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The present research focuses on localizing structural damages in an aluminium and a woven fabric composite laminate. Finite Element (FE) and experimental simulation studies are carried out on specimens of these plates with and without damages, and the response data are collected at various sensor locations. Piezoelectric wafer (PW) transducers are used for actuation and reception of Lamb wave. The group velocity dispersion curves obtained through the experiment and simulation are compared with those obtained analytically to ensure effective actuation and sensing of Lamb wave. A Continuous Wavelet Transform (CWT) is used for receiving the arrival times of the wave reflected from the damages to the sensor locations. After acquiring arrival time data, the geodesic algorithm is employed to locate the damage in the specimens. The geodesic algorithm used is a two-step strategy initially using the Pythagorean Theorem to find the discrete geodesics in the structure, using mesh information and followed by locating the intersections of these geodesics to get the damage locations. Herein, the geodesic algorithm is shown to be effective in detecting several damages in a plate, both experimentally and through FE simulation.

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“…As suggested by Giurgiutiu,12 damage detection should be carried out at the centre frequency where the peak wave amplitude ratio between the S 0 mode and the A 0 mode is maximum.…”

Section: Selection Of Excitation Frequencymentioning

confidence: 99%

Section: Selection Of Excitation Frequencymentioning

confidence: 99%

Section: Finite Element Simulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Lamb Wave Based Experimental and Finite Element Simulation Studies for Damage Detection in an Aluminium and a Composite Plate using Geodesic Algorithm

Masurkar¹,

Yelve²

2017

IJAV

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“…By using Lamb waves in a thin-wall structure, one can detect the existences and positions of cracks, corrosions, delaminations, and other damage [6]. Because of the physical, mechanical, and piezoelectric properties of PWAS transducers, they act as both transmitters and receivers of Lamb waves traveling in the plate.…”

Section: Eusr Steering Beam Direct Structural Imaging With Guidementioning

confidence: 99%

In-Situ Imaging of Crack Growth with Piezoelectric Wafer Active Sensors

Giurgiutiu¹,

Kendall²,

Yu³

2006

47th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference

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Senior Member AIAA Piezoelectric-wafer active sensors (PWAS) are small, inexpensive, non-invasive, elastic wave transmitters/receivers that can be easily affixed to a structure. PWAS are wide-band nonresonant devices that can selectively tune in various Lamb wave modes traveling in a thin-wall structure. PWAS can be wired into sensor arrays and connected to data concentrators and wireless communicators. They have the potential to bring about a revolution in structural health monitoring, damage detection, and non-destructive evaluation just as significant as ultrasonic inspection did 50 years ago. However, its development is not yet complete, and a number of issues have still to be resolved. This paper will present results obtained in using a PWAS phased array to in-situ image crack growth during a simulated structural health monitoring test. The fatigue crack growth experiment was set up on a 1000 mm by 1000 mm 2024-T3 1-mm thick aluminum plate. An initial pre-crack of 30 mm was grown under fatigue loading to a final length of 60 mm over a total of 58 kilocycles run at 10 Hz frequency in an MTS-810 testing machine. During the test, insitu readings of the PWAS phased array were taken while the testing machine was running. The PWAS were excited with a 10-Vpp smoothed 3-count tone burst of 372 kHz, which excited the symmetric S0 Lamb-wave mode. To minimize the equipment requirement to just a single channel, the excitation of the PWAS array was performed in a round robin fashion. Simultaneously, all the PWAS were in term considered as receivers. In this way, an N x N matrix of signals was collected and stored. In the beginning, the received signals were unusable due to the high 10 Hz noise superposed by the testing process. Additional hardware was constructed to pre-filter the received signals prior to digitization. Consequently, usable signals with clear crack reflections were successfully collected. The received signals were post processed with the embedded ultrasonics structural radar (EUSR) algorithm to obtain a direct imaging of the crack in the test plate (similar to the C-scan from ultrasonic NDE, only that was obtained from a single location using a sweeping beam of focused Lamb waves. The imaging results were correlated with physical measurements of the crack size using penetrating liquid and a digital camera. Remarkable consistency was obtained. Subsequently, the results were used to predict further crack growth and make a prognosis of component failure using the structural health monitoring results.

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Damage Measures
Ruzzene¹
2008
Encyclopedia of Structural Health Monitoring
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This article presents an overview of damage measures proposed in the area of structural health monitoring. This is an extremely active, open, and vast research field, as demonstrated by the variety of topics presented in this encyclopedia. The direction taken in this article is to present some examples of techniques that have been proposed, or that are promising tools for the estimation of location and extent of structural damage. All of the techniques considered are based on the analysis of the dynamic response of the structure under consideration. The organization of the article is based on the frequency range of analysis, which spans the low‐frequency range, and correspondingly long response times, associated with the modal analysis of the structure, to frequencies associated with the propagation of guided ultrasonic waves. Hence, the methods presented belong to the classes of vibration‐based and guided waves‐based techniques. The damage measures discussed rely on the estimation of changes in modal parameters of the structure (natural frequencies, mode shapes, and strain energy distributions), or on features associated with the signal corresponding to the measured dynamic response. This overview is not meant to be exhaustive, but rather it provides examples of interesting solutions and approaches proposed in this area.

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Piezoelectric wafer active sensor embedded ultrasonics in beams and plates

Cited by 115 publications

References 21 publications

Lamb Wave Based Experimental and Finite Element Simulation Studies for Damage Detection in an Aluminium and a Composite Plate using Geodesic Algorithm

Lamb Wave Based Experimental and Finite Element Simulation Studies for Damage Detection in an Aluminium and a Composite Plate using Geodesic Algorithm

In-Situ Imaging of Crack Growth with Piezoelectric Wafer Active Sensors

Damage Measures

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