Experimental verification of the damage localization procedure based on modal filtering

Mendrok, Krzysztof; Uhl, Tadeusz

doi:10.1177/1475921710373292

Cited by 20 publications

(16 citation statements)

References 8 publications

(10 reference statements)

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“…This has been the primary motivation for using strain measurements in several previous works [39,40]. Note however that a similar approach has been proposed in [29] using accelerations. Practical issues dealing with the computation of the modal filter coefficients for an efficient filtering are detailed in [22].…”

Section: Extension To Damage Localizationmentioning

confidence: 99%

“…The experimental damage detection on a small aircraft wing using modal filters with accelerometers has been illustrated in [28]. On the contrary to the work of Mendrok and Uhl [29], the extension of modal filters to damage localization proposed in [22] consists in using in service dynamic strain measurements to locate small damage instead of accelerations. This choice of sensing technology is justified by the fact that strains have been demonstrated to be locally sensitive to damage, as discussed both numerically and experimentally in [30][31][32].…”

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confidence: 99%

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Automated data-based damage localization under ambient vibration using local modal filters and dynamic strain measurements: Experimental applications

Tondreau¹,

Deraemaeker²

2014

Journal of Sound and Vibration

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a b s t r a c tThis paper deals with the experimental application of modal filters for automated damage localization using dynamic strain measurements. Previously developed for damage detection, the extension of modal filtering to damage localization consists in splitting a very large network of dynamic strain sensors into several independent local sensor networks. An efficient signal processing coupled to control charts allows a fully automated data-based damage localization once the modal filters are initialized. The method is tested experimentally on a small clamped-free steel plate and a 3.78 m long steel I-beam, both instrumented with a network of cheap piezoelectric patches to measure the dynamic strains. A removable damage is introduced at different positions by means of a small removable damage device. For both applications, the method can successfully detect and locate all damage cases considered, showing the potentiality of the method for field applications.

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Section: Extension To Damage Localizationmentioning

confidence: 99%

mentioning

confidence: 99%

Automated data-based damage localization under ambient vibration using local modal filters and dynamic strain measurements: Experimental applications

Tondreau¹,

Deraemaeker²

2014

Journal of Sound and Vibration

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“…Different types of control charts can be applied, but it has been found in previous studies that the individual control charts which focuses on the shifts of mean values is the most adequate. Finally, because of numerical issues not detailed here, the control chart is applied on 8 √ m 4 instead of m 4 .…”

Section: Statistical Approach For An Automated Damage Localizationmentioning

confidence: 99%

“…By considering strain measurements as well as control charts [9], the idea has next been extended successfully to automated damage localization in many numerical studies [5]. However, with the exception of the experimental study led by Mendrok et al using accelerations [8], the modal filters technique using strain sensors to locate damages has never been tested experimentally so far. This paper aims at presenting for the first time an experimental application of the modal filters with strain measurements by following the guidelines proposed by the authors in previous numerical studies.…”

Section: Introductionmentioning

confidence: 99%

Experimental Localization of Small Damages Using Modal Filters

Tondreau¹,

Deraemaeker²

2013

Special Topics in Structural Dynamics, Volume 6

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This work investigates the experimental application of a damage localization technique based on local modal filters on a small clamped-free steel plate equipped with 8 piezoelectric (PVDFs) sensors, and excited with a PZT patch. A small damage responsible of a small shift of the eigenfrequencies (less than 4%) is introduced at different locations by fixing a stiffener. By following the guidelines established in previous numerical studies, the modal filters are applied on three local filters in order to locate damage, and a new feature extraction procedure is proposed. Univariate control charts are used to locate automatically all the damage positions correctly. The very nice results obtained with this first experimental application of modal filters based on strains show the real interest of this very simple method for output-only non-model based automated damage localization of real structures.

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“…In addition, detection of small delaminations in composite specimens is questionable, as discussed in [1]. Recent examples related to composite materials include studies of nonlinear response characteristics [45], reciprocity analysis [46,47], curvatures and mode shapes [48], modal filtering [49], nonlinear time series [50], nonlinear interactions [51] and higher-order spectra [40,52]. The latter is particularly attractive for the detection of small quadratic nonlinearities.…”

Section: Introductionmentioning

confidence: 99%

Triple correlation for detection of damage-related nonlinearities in composite structures

et al. 2015

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Nonlinear effects in vibration responses are investigated for the undamaged composite plate and the composite plate with a delamination. The analysis is focused on higher harmonic generation in vibration responses for various excitation amplitude levels. This effect is investigated using the triple correlation technique. The dynamics of composite plate was modelled using two-dimensional finite elements and the classical lamination theory. The doubled-node approach was used to model delamination area. Mode shapes and natural frequencies were estimated based on numerical models. Next, the delamination divergence analysis was used to obtain relative displacements for delaminated plies. Experimental modal analysis test was carried out to verify the numerical models. The two strongest vibration modes as well as two vibration modes with the smallest and largest motion level of delaminated plies were selected for nonlinear vibration test. The Fisher criterion was employed to verify The results show that the method can be used not only to reveal nonlinearities, but also to reliably detect impact damage in composites. These results are confirmed using the statistical analysis.

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Experimental verification of the damage localization procedure based on modal filtering

Cited by 20 publications

References 8 publications

Automated data-based damage localization under ambient vibration using local modal filters and dynamic strain measurements: Experimental applications

Automated data-based damage localization under ambient vibration using local modal filters and dynamic strain measurements: Experimental applications

Experimental Localization of Small Damages Using Modal Filters

Triple correlation for detection of damage-related nonlinearities in composite structures

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