Effectiveness of the FRF curvature technique for structural health monitoring

Porcu, Maria Cristina; Patteri, D.M.; Melis, S.; Aymerich, Francesco

doi:10.1016/j.conbuildmat.2019.07.123

Cited by 48 publications

(23 citation statements)

References 20 publications

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“…Here, as the method is modified to be a baseline-free method, hence the effectiveness of the method must be investigated for different frequency ranges. The frequency ranges suggested in the literature, [23][24][25] along with their description are given below and illustrated in Figure 1.…”

Section: Baseline-free Frf Curvature Methodsmentioning

confidence: 99%

“…In addition to the first anti-resonance range and broadband range, a high coherence range has also been introduced in FRF curvature method. 25 High coherence indicates the quality of FRFs and hence a good quality FRF within high coherence range is expected to generate comparatively better results. The study investigated five frequency ranges including the range before first resonance, across first resonance, across second resonance, broadband range with first four natural frequencies and high coherence range.…”

Section: Literature Reviewmentioning

confidence: 99%

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Detection and localization of multiple small damages in beam

Nayyar

Baneen

Naqvi

et al. 2021

Advances in Mechanical Engineering

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Localizing small damages often requires sensors be mounted in the proximity of damage to obtain high Signal-to-Noise Ratio in system frequency response to input excitation. The proximity requirement limits the applicability of existing schemes for low-severity damage detection as an estimate of damage location may not be known a priori. In this work it is shown that spatial locality is not a fundamental impediment; multiple small damages can still be detected with high accuracy provided that the frequency range beyond the first five natural frequencies is utilized in the Frequency response functions (FRF) curvature method. The proposed method presented in this paper applies sensitivity analysis to systematically unearth frequency ranges capable of elevating damage index peak at correct damage locations. It is a baseline-free method that employs a smoothing polynomial to emulate reference curvatures for the undamaged structure. Numerical simulation of steel-beam shows that small multiple damages of severity as low as 5% can be reliably detected by including frequency range covering 5–10th natural frequencies. The efficacy of the scheme is also experimentally validated for the same beam. It is also found that a simple noise filtration scheme such as a Gaussian moving average filter can adequately remove false peaks from the damage index profile.

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Section: Baseline-free Frf Curvature Methodsmentioning

confidence: 99%

Section: Literature Reviewmentioning

confidence: 99%

Detection and localization of multiple small damages in beam

Nayyar

Baneen

Naqvi

et al. 2021

Advances in Mechanical Engineering

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“…Coherence function drops, harmonic distortion, and singularities in the Holder exponent were also applied to identify the damage signature in the system response [6]. Moreover, nonlinear acoustic and vibration-based methods have been widely used for damage detection [7][8][9][10][11][12]. To identify damage in composite materials some techniques focused on specific features of the elastic system response such as wave modulation and cross-modulation [13][14][15][16], sidebands [7,17], higher and sub-harmonic generation, hysteretic behavior and nonlinear slow dynamics [18].…”

Section: Introductionmentioning

confidence: 99%

Impact Damage Detection in Composite Beams by Analysis of Non-Linearity under Pulse Excitation

2021

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To detect the presence of damage, many structural health monitoring techniques exploit the nonlinear features that typically affect the otherwise linear dynamic response of structural components with internal defects. One of them is the Scaling Subtraction Method (SSM), which evaluates nonlinear features of the response to a high-amplitude harmonic excitation by subtracting a scaled reference signal. Originally tested on granular materials, the SSM was shown to be effective for composite materials as well. However, the dependence of the technique efficiency on the testing frequency, usually selected among the natural frequencies of the system, may limit its application in practice. This paper investigates the feasibility of applying the SSM through a broadband impulsive excitation, which would avoid the need of a preliminary modal analysis and address the issue of the proper selection of the excitation frequency. A laminated composite beam was tested in intact and damaged conditions under both scaled harmonic excitations of different frequency and broadband impulsive signals of scaled amplitude. Two damage indicators working on the frequency domain were introduced. The results showed a good sensitivity of the SSM to the presence and level of impact damage in composite beams when applied through a broadband impulsive excitation.

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“…and of the efficiency of the pipeline system (i.e., corrosion, settlements, etc.) [26,27] can be used as important information in the numerical analysis. The experience in dynamic tests showed that the variation of eigenfrequencies was not a sensible indicator of deterioration.…”

Section: Introductionmentioning

confidence: 99%

Efficient Seismic Fragility Analysis for Large-Scale Piping System Utilizing Bayesian Approach

Kwag

Ryu

2020

Applied Sciences

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In the event of an earthquake, it is essential to accurately assess the seismic fragility of piping systems to ensure the continued safety of society. When evaluating the seismic fragility of a piping system, which is generally a secondary structural system, this should mainly be an integrated model that includes both the primary structural frames and the secondary ones, unlike the primary structural system of a building. Hence, the piping seismic fragility evaluation has an issue in that it takes considerable computational time because numerical analyses must be performed on a relatively complex model. Given this background, the purpose of this study is to propose an efficient piping seismic fragility analysis method by utilizing the existing seismic fragility analysis method and the Bayesian updating concept. In order to verify the validity of the proposed method, it was applied to a building–piping coupled structural system example, and its results were analyzed and compared with the results of the existing method in terms of accuracy and efficiency. As a result, the proposed method showed a similar accuracy compared with the existing method while significantly reducing the numerical cost of nonlinear seismic response analyses necessary for these results.

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Effectiveness of the FRF curvature technique for structural health monitoring

Cited by 48 publications

References 20 publications

Detection and localization of multiple small damages in beam

Detection and localization of multiple small damages in beam

Impact Damage Detection in Composite Beams by Analysis of Non-Linearity under Pulse Excitation

Efficient Seismic Fragility Analysis for Large-Scale Piping System Utilizing Bayesian Approach

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