Damage detection in plates structures based on frequency shift surface curvature

Zhang, Yao; Wang, Longqi; Lie, S.T.; Xiang, Zuoshuang

doi:10.1016/j.jsv.2013.07.028

Cited by 31 publications

(31 citation statements)

References 22 publications

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“…An abnormal frequency variation has been found around the crack locations. This defect-dependent frequency variation has also been observed experimentally recently in a plate and a cylinder with pre-defined notch defect by Zhang et al [18,19]. The focus of the current work is on the investigation of the variation of the dynamic characteristics of delaminated composite structures using concentrated mass loading.…”

Section: Introductionsupporting

confidence: 71%

Detection of delamination in composite beams using frequency deviations due to concentrated mass loading

Yang

Oyadiji

2016

Composite Structures

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Section: Introductionsupporting

confidence: 71%

Detection of delamination in composite beams using frequency deviations due to concentrated mass loading

Yang

Oyadiji

2016

Composite Structures

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“…As explained in detail in section 2.32.3 the SIM does not need the estimation of curvatures through differentiation because the losses of stiffness are identified as discontinuities of a smooth cubic spline function. This reduces the sensitivity of the algorithm to noise that, on the contrary, limits the reliability of other damage identification methods proposed in literature (see references [9], [11] [12], [14]- [15]). In order to check the sensitivity to noise of the surface interpolation method to noise, responses of the numerical model of the plate have been corrupted with a Gaussian zero mean white noise assuming a noise to signal ratio of 10%.…”

Section: Effect Of Measurement Noisementioning

confidence: 99%

“…In reference [12] and [13] respectively the strain energy method and the gapped smoothing method are extended to plates. and mMore recently the Frequency Shift Surface, based on the Frequency Shift Curve Method was extended to plates-like structures [14]. Wu and Law in reference [15] proposed for damage localization in plates the uniform load surface defined as the vertical displacement of athe plate under uniform load for damage localization in plate-like structures.…”

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confidence: 99%

“…This phenomenon numerically enhances local reductions of smoothness thus causing a sharp increase of the interpolation error at locations of curvature discontinuity.. In reference [20] the modal SIM, two-dimensional extension of the previously published modal IM, was proposed and applied to the example of a plate already used by other researchers (see reference [14]). In all the previous applications of the IM and of the SIM the method was used as a level 2 damage identification algorithm meaning a method able to detect and locate damage.…”

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confidence: 99%

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The Surface Interpolation Method for damage localization in plates

Limongelli

2019

Mechanical Systems and Signal Processing

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This paper presents a vibration based procedure for locating reductions of stiffness in plate-like structures. This procedure is a generalization to the two-dimensional case of the Interpolation Method (IM) previously published by the author. The method is based on the definition of a damage sensitive feature in terms of the accuracy of a spline function in interpolating the operational displacement shapes of the structure. In the previous works the IM was applied as a method of level 2 for damage identification that is able to detect and localize damage. In this paper an analytical relationship between the damage feature and the curvature discontinuity is proved. For two-dimensional structures, a bi-cubic spline surface is defined herein to interpolate the operational shapes. In order to account for the uncertainties related to random variations of the damage feature, an approach based on the definition of an acceptable value of the probability of false alarm was formerly proposed by the author. A simplified version of the algorithm is presented herein for the case that whereby the statistical distribution of the damage feature in the original (undamaged) state is not available, and the damage diagnosis has to be carried out basing based on just two sets of responses recorded on the original and on the (possibly) damaged structure. The proposed two-dimensional Surface Interpolation Method (SIM) is checked herein through via numerical simulations using the FE model of a plate and modeling local reductions of stiffness through a reduction of the elastic modulus of the material. Validation rResults demonstrate that the algorithm provides a reliable tool for damage identification of platelike structures. The performance of the method can be affected by noise in recorded data, but however a careful choice of the accepted probability of false alarm can reduce this drawback. 2

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“…Zhang and Xiang (2011) demonstrated analytically the change of natural frequencies with respect to the location of auxiliary mass and they found that the change of frequencies is equivalent to the mode shapes square which is proven sensitive to local damages. Later, they (Zhang et al, 2013b) extended this approach to plate like structures.…”

Section: Influence Of Auxiliary Mass On Frequenciesmentioning

confidence: 99%

Vibration based damage assessment of type 1 compressed natural gas cylinder

Zhang¹

Self Cite

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China, for his numerous suggestions and constructive remarks. The author would also like to express his sincere gratitude to other research team members for providing numerous suggestions and sharing their findings and experience. Many thanks also to the technicians in Protective Engineering Laboratory and Construction Technology Laboratory for their valuable assistance in the experimental work. The author is very grateful to the Land Transport Authority of Singapore for kindly funding this project and Maritime Research Centre in the School of Civil & Environmental Engineering, Nanyang Technological University, Singapore, for providing his opportunity to conduct the research. Thanks are also given to my colleague Wang longqi for his outstanding technical support. Most importantly, I would like to thank my parents and wife for their understanding, unconditional love and encouragement. Without their constant spiritual support, the successful completion of this project would be impossible.

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Damage detection in plates structures based on frequency shift surface curvature

Cited by 31 publications

References 22 publications

Detection of delamination in composite beams using frequency deviations due to concentrated mass loading

Detection of delamination in composite beams using frequency deviations due to concentrated mass loading

The Surface Interpolation Method for damage localization in plates

Vibration based damage assessment of type 1 compressed natural gas cylinder

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