Impact damage identification in composite skin-stiffener structures based on modal curvatures

Ooijevaar, T.H.; Warnet, Laurent; Loendersloot, Richard; Akkerman, Remko; Tinga, Tiedo

doi:10.1002/stc.1754

Cited by 21 publications

(14 citation statements)

References 48 publications

(90 reference statements)

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“…Because of the highly sensitive characteristic to local defects, modal curvature and/or modal strain based quantities have been widely utilized to identify the presence, locations, and severity of damage in dynamic structures by the comparisons of before and after damage [23][24][25][26]. For the assessment of structural status, modal macrostrain vectors, macrostrain frequency response functions, and modal curvatures were successfully applied in structural health monitoring [27,28]. Furthermore, for dynamic stresses analysis, Pelayo et al [29] proposed a modal-based method in which the SMSs play a key role.…”

Section: Shock and Vibrationmentioning

confidence: 99%

Modal Strain Based Method for Dynamic Design of Plate-Like Structures

Zhou

Trišović

et al. 2016

Shock and Vibration

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Design optimization of dynamic properties, for example, modal frequencies, can be of much importance when structures are exposed to the shock and/or vibration environments. A modal strain based method is proposed for fast design of natural frequencies of plate-like structures. The basic theory of modal strains of thin plates is reviewed. The capability of determining the highly sensitive elements by means of modal strain analysis is theoretically demonstrated. Finite element models were constructed in numerical simulations. Firstly, the application of the proposed method is conducted on a central-massed flat plate which was topologically optimized by the Reference. The results of modal strain analysis at the first mode have good agreement with the results from the topology optimization. Furthermore, some features of the strain mode shapes (SMSs) of the flat plate are investigated. Finally, the SMSs are applied to the optimization of a stiffened plate. Attention is focused on the distributions of the SMSs of the stiffeners, which also shows good agreement with the results from the topology optimization in the previous study. Several higher orders of SMSs are extracted, which can visualize the most sensitive elements to the corresponding modal frequency. In summary, both the theory and simulations validate the correctness and convenience of applying SMSs to dynamic design of plate-like structures.

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Section: Shock and Vibrationmentioning

confidence: 99%

Modal Strain Based Method for Dynamic Design of Plate-Like Structures

Zhou

Trišović

et al. 2016

Shock and Vibration

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“…Several advantages and limitations of these methods were also pointed out. Many studies confirm that mode shapes and corresponding mode shape curvatures are highly sensitive to damage and can be used for detection and quantification of the damage. Maia et al in performed extensive numerical simulations on a beam structure to compare damage identification sensitivity within different methods, based on the changes of mode shape, mode shape slope, mode shape curvature and mode shape curvature square, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…The authors concluded that this algorithm is successful, although the data obtained from impact testing were classified with higher accuracy than that obtained with a shaker. Dworakowski et al in used a digital image correlation to build a deflection curve of a cantilevered beam. After the introduction of damage, these curves were fitted to two line segments, and an angle between segments was taken as a damage index.…”

Section: Introductionmentioning

confidence: 99%

Mode shape-based damage detection in plate structure without baseline data

Ručevskis

Janeliukštis

Akishin

et al. 2016

Struct. Control Health Monit.

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In this paper, a mode shape curvature-based method for detection and localization of damage in plate-like structures is described. The proposed algorithm requires only the mode shape curvature data of the damaged structure. The damage index is defined as the absolute difference between the measured curvature of the damaged structure and the smoothed polynomial representing the curvature of the healthy structure. To examine the advantages and limitations of the proposed method, several sets of numerical simulations are carried out. Simulated test cases considering different levels of damage severity, measurement noise and sensor sparsity are studied to evaluate the robustness of the method under the noisy experimental data and limited sensor data. Applicability and effectiveness of the proposed damage detection method are further demonstrated experimentally on an aluminium plate containing mill-cut damage. The modal frequencies and the corresponding mode shapes are obtained via finite element models for numerical simulations and by using a scanning laser vibrometer for the experimental study. Copyright

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“…Wave propagation properties mainly depend on their attenuation properties and waveform characteristics [9][10][11]. Vibration modes and related methods are more commonly used, including natural frequency and frequency response function spectrum (FRFs) based methods [12][13][14][15], mode shape based methods [16], mode shape curvature/strain mode shape based methods [17,18], model and related matrix based methods [19], and data driven methods [20]. Some signal processing techniques are proposed for the extraction of vibration characteristics [21].…”

Section: Introductionmentioning

confidence: 99%

Vibration Characteristics of Underground Structure and Surrounding Soil Underneath High Speed Railway Based on Field Vibration Tests

Zhou

Zhang

Xie

2018

Shock and Vibration

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A series of field vibration tests were carried out at an underground metro station underneath the high speed railway by installing accelerometers both on the side wall of the metro station and in the surrounding soil. Within the frequency domain of 0-200 Hz, the attenuation, transmission, and frequency response properties of vibration for both the underground structure and the surrounding soil were analyzed and compared. The attenuation index is found to be decreased with the increase of underground structure stiffness. The existence of damping and coupling effect of the surrounding soil, as well as the interference of axle spectrum from excitation sources, makes it very challenging to separate the frequency response characteristics of structures from soil at FFT (Fast Fourier Transform) spectrum. The combined NExT (Natural Excitation Technique) and HHT (Hilbert-Huang Transform) method are thus used to study the waveforms and propagation velocities of vibration waves in underground structure and surrounding soil. The wave types and their speeds are determined and used for evaluating the structural elastic modulus. Compared with the attenuation index or natural frequency, wave velocity is easier to be recognized, is sensitive to the change of the structural stiffness, and requires limited number of sensors in the field. Based on the properties of the vibration characteristics studied in this work, the wave velocity based method is recommended for the health monitoring of underground structures.

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Impact damage identification in composite skin-stiffener structures based on modal curvatures

Cited by 21 publications

References 48 publications

Modal Strain Based Method for Dynamic Design of Plate-Like Structures

Modal Strain Based Method for Dynamic Design of Plate-Like Structures

Mode shape-based damage detection in plate structure without baseline data

Vibration Characteristics of Underground Structure and Surrounding Soil Underneath High Speed Railway Based on Field Vibration Tests

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