Application of modal-based damage-detection method to locate and evaluate damage in timber beams

Choi, Fook Choon; Li, Jianchun; Samali, Bijan; Crews, Keith

doi:10.1007/s10086-006-0881-5

Cited by 27 publications

(20 citation statements)

References 9 publications

(10 reference statements)

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“…Modal-based damage detection algorithm for identifying the location and extent of the defects in timbers was the subject of a recent study that came up with some modifications to the existing defect detection algorithms. In this study, researchers used the two initial modes of vibration to compare the modal strain energy before and after damage (Choi et al, 2007). In order to compare the mode shapes of vibration before and after damage in timbers, modal-based testing was applied on wood bars in order to propose a new statistical algorithm for obtaining a defect indicator .…”

Section: Article Published By Edp Sciencesmentioning

confidence: 99%

Les constantes élastiques du bois de peuplier fissuré aux extrémités

2010

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Abstract• In this study, longitudinal specific modulus of elasticity along the grain (specific MOE L = MOE L /ρ) as well as radial and tangential shear moduli (G LR and G LT ) of Populus Deltoides wood were examined in free flexural vibration in a free-free bar method, where end-cracks produced manually in LT plane along and parallel to annual rings in four different sizes.• The effects of four different crack sizes (0, 6, 12, and 18 cm) on elastic parameters of the bars were examined for their vibration properties based on Timoshenko bar equations, in order to find a procedure to make a confident choice of a clear specimen among the cracked ones, considering three initial modes of vibration.• Based on research findings, a significant correlation existed between radial and tangential shear moduli of the clear bars as G LR was approximately 15 percents higher than G LT . After making the shortest crack sizes, however, this correlation entirely faded. Statistically for 6 cm crack, decreases in specific MOE L for measurement on the tangential impact were not significant though they were for longer cracks.• It was also revealed that in specimen under the study if longitudinal specific modulus of elasticity from both LR and LT flexural vibrations were almost equal and G LR was slightly larger than G LT , the user could be confident enough to consider the specimen without severe longitudinal cracks. Mots-clés :fissure / endommagement / élasticité / vibration libre / Populus deltoides Résumé -Les constantes élastiques du bois de peuplier fissuré aux extrémités.• Dans cette étude, le module d'élasticité longitudinal spécifique (MOEL/ρ) et les modules de cisaillement radial et tangentiel (G LR and G LT ) du bois de Populus deltoides ont été mesuré en vibration de flexion libre-libre pour quatre différentes longueurs de fissures initiées manuellement dans le plan LT qui est parallèle au fil du bois et tangentiel aux limites de cernes.• Les effets des quatre différentes tailles de fissures (0, 6, 12 et 18 cm) sur les constantes élastiques des barres ont été examinées pour leurs propriétés vibratoires sur la base des équations de Timoshenko, dans le but de trouver une procédure conduisant à un choix fiable d'un échantillon sans défauts parmi les échantillons fissurés, ceci en considérant les trois modes initiaux de vibration.• Les résultats obtenus montrent une corrélation significative entre les modules de cisaillement radial et tangentiel des barres sans défauts, G LR étant environ 15 pour cent plus élevé que G LT . Cependant après avoir réalisé les fissures les plus courtes cette corrélation n'existe plus. Pour une fissure de 6 cm, la décroissance du module longitudinal spécifique mesuré en tangentiel n'est pas significative alors que c'était le cas pour des fissures plus longues.• Pour nos échantillons, nous avons également montré que si les modules d'élasticité longitudinaux spécifiques sont presque identiques et G LR légèrement plus important que G LT , l'utilisateur peut exploiter en confiance les échantillons sans f...

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Section: Article Published By Edp Sciencesmentioning

confidence: 99%

Les constantes élastiques du bois de peuplier fissuré aux extrémités

2010

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“…1. Fig.1 illustrates that the first three modes of wood specimens are discrete, thus it is feasible to identify the intrinsic frequency by using single modal method [5,6].…”

Section: ) Identification For Intrinsic Frequenciesmentioning

confidence: 99%

Application of Artificial Neural Network to Nondestructive Testing of Internal Wood Defects Based on the Intrinsic Frequencies

Wang

2010

2010 International Conference on System Science, Engineering Design and Manufacturing Informatization

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The location and size of internal wood defects are nondestructively determined using experimental modal analysis and artificial neural network in this study. The different defect sizes and locations were simulated by removing mass from intact wood specimens. At room temperature in the laboratory, free vibration testing was conducted to generate the frequency response functions (FRF) of intact and defective Korean Pine (Pinus koraiensis) wood specimens using fast Fourier transform analysis system. The first three orders intrinsic frequencies were captured by picking up the location of each order peak of FRF curves. Then, two identification indexes developed by previous research were constructed based on these intrinsic frequencies, and they were used as input parameters to build the networks for localization and size determination of wood defects respectively. These two artificial neural networks were trained and tested for wood defects recognition. The research results showed that: (1) the intrinsic frequencies of defective wood were lower than those of intact wood; and (2) the constructed two identification indexes were capable to effectively detect the location and size of wood defects, which were more sensitive to large size defects than small size defects. Keywords-experimental modal analysis;intrinsic frequency; artificial neural network; wood defectI.

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“…Peterson et al [ 9 , 10 ] and Hu et al [ 11 ] developed statistical algorithms and damage indices by computing the mode shapes of timber beams before and after damage under vibration tests. Subsequently, Choi et al [ 12 ] proposed an improved damage detection algorithm to estimate the status of wooden material by comparing the modal strain energy derived from the first two flexural vibration modes. Similarly, the wavelet transform method [ 13 ], the transfer function method [ 14 , 15 ], and the mode shape reconstruction technique [ 16 ] were adopted to find the model shapes of timber, which revealed that the mode shapes before and after damage could be further utilized to identify the damage status and location in timber.…”

Section: Introductionmentioning

confidence: 99%

A Feasibility Study on Timber Damage Detection Using Piezoceramic-Transducer-Enabled Active Sensing

Zhang

Huang

Zheng

2018

Sensors

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In recent years, piezoelectric-based transducers and technologies have made significant progress towards structural health monitoring and damage evaluation for various metal and concrete structures. Timber is still commonly used as a construction material in practical engineering; however, there is a lack of research on the health monitoring of timber-based structures using piezoelectric-based transducers and methods. This paper conducts a feasibility study on timber damage detection using surface-mounted piezoelectric patches, which enable the stress-wave-based active sensing approach. Typical damage modes in timber frame structures, such as surface cracks and holes, were investigated in this study. In the active sensing approach, one piezoceramic transducer is used as an actuator to generate stress waves, which propagate along the surface of the timber structure, and other piezoceramic transducers function as sensors to detect the propagating stress waves. Defects, such as a crack or a hole, induce additional attenuation to the propagating stress wave. Based on this attenuation, the proposed method can detect the defects using the wavelet-packet-based damage index, demonstrating its implementation potential for real-time timber damage detection.

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Application of modal-based damage-detection method to locate and evaluate damage in timber beams

Cited by 27 publications

References 9 publications

Les constantes élastiques du bois de peuplier fissuré aux extrémités

Les constantes élastiques du bois de peuplier fissuré aux extrémités

Application of Artificial Neural Network to Nondestructive Testing of Internal Wood Defects Based on the Intrinsic Frequencies

A Feasibility Study on Timber Damage Detection Using Piezoceramic-Transducer-Enabled Active Sensing

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