Vibration-based damage detection in beam structures with multiple cracks: modal curvature vs. modal flexibility methods

Altunışık, Ahmet Can; Okur, Fatih Yesevi; Karaca, Sebahat; Kahya, Volkan

doi:10.1080/10589759.2018.1518445

Cited by 65 publications

(29 citation statements)

References 19 publications

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“…Experimental configuration has been carried out by Altunışık et al (2017). A number of research on FEM updating and damage detection have been performed in recent years based on this experiment and they can be found in Altunışık et al (2019a, 2019b). To obtain the experimental natural frequencies and mode shapes, the cantilever beam is excited by ambient vibration.…”

Section: Serepmentioning

confidence: 99%

Efficiency of grey wolf optimization algorithm for damage detection of skeletal structures via expanded mode shapes

Ghannadi

Kourehli

Noori

et al. 2020

Advances in Structural Engineering

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Vibration-based structural damage identification through optimization techniques has become an interesting research topic in recent years. Dynamic characteristics such as frequencies and mode shapes are used to construct the objective function. The objective functions based on only frequencies are not very sensitive to damage in large structures. However, objective functions based on both mode shapes and frequencies are very effective. In real measurement condition, the number of installed sensors is limited, and there are no economic reasons for measuring the mode shapes at all degrees of freedom. In this kind of circumstances, mode expansion methods are used to address the incompleteness of mode shapes. In this article, the system equivalent reduction and expansion process is applied to determine the unmeasured mode shapes. Two experimental examples including a cantilever beam and a truss tower are investigated to show system equivalent reduction and expansion process’ efficiency in estimating unmeasured mode shapes. The results show that the technique used for expansion is influential. Damage identification is formulated as an optimization problem, and the residual force vector based on expanded mode shapes is considered as an objective function. In order to minimize the objective function, grey wolf optimization and Harris hawks optimization are used. Numerical studies on a 56-bar dome space truss and experimental validation on a steel frame are performed to demonstrate the efficiency of the developed approach. Both numerical and experimental results indicate that the combination of the grey wolf optimization and expanded mode shapes with system equivalent reduction and expansion process can provide a reliable approach for determining the severities and locations of damage of skeletal structures when it compares with those obtained by Harris hawks optimization.

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Section: Serepmentioning

confidence: 99%

Efficiency of grey wolf optimization algorithm for damage detection of skeletal structures via expanded mode shapes

Ghannadi

Kourehli

Noori

et al. 2020

Advances in Structural Engineering

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“…Hu et al 20 proposed a damage localization method based on Bayesian operational modes. Altunışık et al 21 realized crack localization of a beam from its mode curvature. Katunin 22 adopted the wavelet transform of mode shapes to localize cracks.…”

Section: Introductionmentioning

confidence: 99%

Crack localization in stepped rotors based on Bayesian fusion of multiscale superharmonic characteristic deflection shapes

Cao

Ouyang

et al. 2020

Fatigue Fract Eng Mat Struct

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A crack is one of the most dangerous faults in rotors of key rotating machinery. In order to make reasonable maintenance, crack localization for rotors under operational conditions is very important and full of challenges. Focusing on crack localization in rotating rotors, a new crack localization method for stepped rotors based on Bayesian fusion of multiscale superharmonic characteristic deflection shapes (SCDSs) is proposed. The non‐linearity induced by cracks is utilized to eliminate the interference of stiffness reduction by steps in the rotor, and the noise‐robustness issue is tackled by casting the SCDSs into multiscale SCDSs with multiscale space theory. Moreover, Bayesian fusion is applied to the multiscale SCDSs to derive a new damage index to localize cracks. Numerical and experimental investigations are conducted to validate the proposed method. The results indicate that the proposed method is effective, accurate and robust for single or multiple crack localization in stepped rotors, and thus, it has a great potential in practical applications.

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“…In addition to these analytical studies, some experimental works were also carried out by Nahvi and Jabbari [18], Hou and Lu [19]. Altunisik et al [20] compared experimental results with analytical results. Kim et al [21] used ultraspherical orthogonal polynomials to obtain numerical results of a cracked beam.…”

Section: Introductionmentioning

confidence: 99%

Damped vibration analysis of cracked Timoshenko beams with restrained end conditions

Pala

Beyçimen

Kahya

2020

J Braz. Soc. Mech. Sci. Eng.

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Damped vibration of a cracked Timoshenko beam with ends supported with damper, linear and rotational springs is investigated. Frequencies in complex forms have been obtained for both cracked Euler-Bernoulli and Timoshenko beams. Depending upon the crack-depth and crack-location, frequencies have been tabulated in each case. The results have also been compared in terms of the ratio of the beam depth to the beam length. Modal shapes for various conditions have also been plotted.

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Vibration-based damage detection in beam structures with multiple cracks: modal curvature vs. modal flexibility methods

Cited by 65 publications

References 19 publications

Efficiency of grey wolf optimization algorithm for damage detection of skeletal structures via expanded mode shapes

Efficiency of grey wolf optimization algorithm for damage detection of skeletal structures via expanded mode shapes

Crack localization in stepped rotors based on Bayesian fusion of multiscale superharmonic characteristic deflection shapes

Damped vibration analysis of cracked Timoshenko beams with restrained end conditions

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