Identification of structural damage based on locally perturbed dynamic equilibrium with an application to beam component

Xu, Hao; Li, Cheng; Su, Zhongqing; Guyader, Jean‐Louis

doi:10.1016/j.jsv.2011.07.028

Cited by 47 publications

(49 citation statements)

References 25 publications

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“…This is scanning laser Doppler vibrometry (SLDV) and it provides spatially-resolved information allowing a structure's operational deflection shape to be ascertained [6] as long as the excitation and specimen response are stable with time. Thanks to its relative ease of implementation, it has been extensively used, for example, in full wavefield signal processing [3] but also in damage detection using mechanical equilibria formulations at low frequency on beams [7], mid frequency [8] and high frequency [9][10][11][12] on plates. Scanning laser Doppler vibrometry provides similar data to the technique proposed here as long as the excitation and response are stable over a prolonged period of time.…”

Section: Introductionmentioning

confidence: 99%

Time-resolved full-field imaging of ultrasonic Lamb waves using deflectometry

et al. 2015

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This pioneering experimental work is a proof of concept in which ultrasonic flexural waves have been imaged in a spatially and temporally resolved manner. Thin vibrating plates made of mirror glass and carbon/epoxy composite have been used in the experiments. Results obtained via a standard approach (scanning laser Doppler vibrometry) and the novel methodology based on deflectometry have been compared with a multi-physics finite element simulation. There is a very good correlation between the two experimental techniques. The numerical model provides insight into the experiments, but differs in its detailed structure due to uncertainties over material properties. The extreme slope resolution of deflectometry allows the measurement of peak-to-peak deflections of a few tens of nanometres in one shot. The use of an ultra-high speed camera allows for both space and time resolved measurements of Lamb waves which, to the best knowledge of the authors, has never been reported before. The limitations of the technique arise from the need for a flat specularly reflective surface. However, coating is possible for non-reflective materials and extension to moderately curved surfaces is possible in the future.

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Section: Introductionmentioning

confidence: 99%

Time-resolved full-field imaging of ultrasonic Lamb waves using deflectometry

et al. 2015

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“…Without loss of the generality, a vibration-based damage detection approach (Xu et al 2011), by examining damage-incurred local perturbance to structural dynamic equilibrium, was selected to facilitate the understanding and demonstration of the proposed noise reduction strategies.…”

Section: A Vibration-based Damage Detection Approach Involving Highermentioning

confidence: 99%

“…The high-order derivatives at (i, j) can be obtained in virtue of a finite difference scheme using the displacements measured at its twelve neighboring points, as illustrated in Figure 1, to construct DI i, j . It has been demonstrated (Xu et al 2011) that the constructed damage indices present prominent oscillations at the boundaries of a damaged zone, and such an attribute can be utilized to locate and characterize damage precisely in beam and plate components.…”

Section: Theorymentioning

confidence: 99%

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Suppressing Influence of Measurement Noise on Vibration-Based Damage Detection Involving Higher-Order Derivatives

2013

Advances in Structural Engineering

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Aimed at minimizing the influence of measurement noise on the precision and robustness of vibration-based damage detection (particularly for those approaches involving higher-order derivatives of vibration signals), three independent noise reduction strategies were proposed, including low-pass wavenumber filtering (LWF), adjustment of measurement density (AMD), and hybrid data fusion. Residing on a spectrum analysis, LWF suppresses the noise influence by filtering the measurement noise out of a specific wavenumber domain whilst remaining damage-associated signal features only. AMD is based on an inherent correlation between the degree of noise influence and the density of measurement points. By selecting an optimal AMD, the effect of measurement noise on detection precision can be alleviated. The hybrid data fusion amalgamates signal features acquired under different measurement conditions, giving prominence to the salient features in common (i.e., those pertaining to damage) whereas suppressing less salient features in individuals (e.g., measurement noise and uncertainties). Three proposed noise reduction techniques were validated respectively in simulation, and then applied experimentally to the detection of damage in a plate-like structure under a noisy measurement condition. Satisfactory noise suppression was achieved, demonstrating the effectiveness of the proposed noise reduction strategies for vibration-based damage detection.

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“…In general, many approaches are validated against numerical and/or experimental laboratory structures of the beam or plate type, and recent examples are [4][5][6]. The approaches followed include variants of mode shape curvature/modal strain energy e.g.…”

Section: Introductionmentioning

confidence: 99%

The use of pseudo-faults for damage location in SHM: An experimental investigation on a Piper Tomahawk aircraft wing

Papatheou

Manson

Barthorpe

et al. 2014

Journal of Sound and Vibration

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The application of pattern recognition-based approaches in damage localisation and quantification will eventually require the use of some kind of supervised learning algorithm. The use, and most importantly, the success of such algorithms will depend critically on the availability of data from all possible damage states for training. It is perhaps well known that the availability of damage data through destructive means cannot generally be afforded in the case of high value engineering structures outside laboratory conditions. This paper presents the attempt to use added masses in order to identify features suitable for training supervised learning algorithms and then subsequently test the trained classifiers with damage data, with the ultimate purpose of damage localisation. In order to test the approach of adding masses, two separate cases of a dual-class classification problem, representing two distinct locations, and a three-class problem representing three distinct locations, are examined with the help of a full-scale aircraft wing. It was found that an excellent rate of correct classification could be achieved in both the dual-class and threeclass cases. However, it was also found that the rate of correct classification was sensitive to the choices made in training the supervised learning algorithm. The results for the dual-class problem demonstrated a comparatively high level of robustness to these choices with a substantially lower robustness found in the three-class case.

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Identification of structural damage based on locally perturbed dynamic equilibrium with an application to beam component

Cited by 47 publications

References 25 publications

Time-resolved full-field imaging of ultrasonic Lamb waves using deflectometry

Time-resolved full-field imaging of ultrasonic Lamb waves using deflectometry

Suppressing Influence of Measurement Noise on Vibration-Based Damage Detection Involving Higher-Order Derivatives

The use of pseudo-faults for damage location in SHM: An experimental investigation on a Piper Tomahawk aircraft wing

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