Identification of defect position in a wooden beam from the power spectrum of longitudinal vibration

Sobue, Nobuo; Fujita, Miho; Nakano, Atsuko; Suzuki, Tomohiro

doi:10.1007/s10086-009-1080-y

Cited by 16 publications

(23 citation statements)

References 5 publications

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“…The dominant spikes coincided well with the damage location (Hu and Afzal 2006b). Sobue et al (2010) exploited an inverse solution procedure enabling the identification of the defect position within a beam, which was made possible by the resonance frequency of longitudinal vibrations. Song et al (2011) tested larch lumber pieces using a modal analysis technique, while frequency response functions (FRF) were derived.…”

Section: Introductionmentioning

confidence: 93%

Identification of the Severity and Position of a Single Defect in a Wooden Beam

Roohnia¹,

Tajdini²

2014

BioResources

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In the present paper changes of validity in Euler-Bernoulli's elementary theory of flexural vibration for homogeneous materials were tested with respect to changing severity and position of a single defect in wood. As an orthotropic material, wood has different material properties or strengths in different orthogonal directions. A set of absolutely clear specimens of oriental beech was chosen and hand drilled in different diameters (severities) at different relative distances from an end oriented in the R direction. A clear specimen showed a steady decrease in evaluated moduli of elasticity related to increasing mode numbers. After creating the defects, this steady decrease line showed some breakages. The slope breakages of modally evaluated elastic moduli in LT and LR vibrations are suggested as potential finger-prints of single hole defects in the specimen by considering the shape and rate of breakages in the decreasing lines. The recognition scenarios of slope breakages for defect severity and position are summarized.

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Section: Introductionmentioning

confidence: 93%

Identification of the Severity and Position of a Single Defect in a Wooden Beam

Roohnia¹,

Tajdini²

2014

BioResources

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“…However, by leaving aside the defect characterization, to give a full explanation of such dependency over the range of product lines, the number of fuzzy rules would be too large to handle. There was also an effort to identify defect position in a wooden beam [112], but this approach could not provide other information significant to manufacturing applications.…”

Section: ) [106-109]mentioning

confidence: 99%

Automated process planning and cost estimation under material quality uncertainty

Huang

Chaiprapat

Waiyagan

2015

Int J Adv Manuf Technol

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“…Previous authors (CAM et al, 2004;DIVOS et al, 2001;SOBUE et al, 2010;SONG et al, 2011) studied the influence of defect on the dynamic behavior of wood in order to detect and positioned the local heterogeneities. Divos et al (2001), by the means of a time analysis technique, showed that the amplitude of the received signal was more sensitive to the presence of defect than the measurement of the propagation velocity.…”

Section: Introductionmentioning

confidence: 99%

“…However, the differences revealed information about the defect in the frequency domain. Sobue et al (2010) analyzed the resonance frequencies of beams in longitudinal vibrations. They exploited an inverse solution procedure enabling the identification of the defect position within a beam.…”

Section: Introductionmentioning

confidence: 99%

Orientation and Position Effects of a Local Heterogeneity on Flexural Vibration Frequencies in Wooden Beams

Roohnia

Brancheriau²

2015

CERNE

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Studying the influence of defect on the dynamic behavior of wood in order to detect the local heterogeneities is of great importance in non-destructive testing of wood. The natural heterogeneities in wood are oriented in a volume. However, onedimensional models are still used in dynamic characterization of wooden beams. The aim of this study was to experimentally investigate the effects of the orientation and position of an artificial defect on the flexural vibration frequencies. Different batches of Fagus orientalis specimens were drilled in the radial direction at five positions along the specimen. Dynamic tests in free flexural vibration were performed on the specimens before and after drilling both in the longitudinal-radial (LR) and longitudinal-tangential (LT) bending plan. The behavior in free flexural vibration was found to be different depending on the position and orientation of heterogeneity. When the drilling axis lies in the bending plane (LR), the weakening of frequency was maximal at the location of an antinode of vibration. On the contrary, the frequency offset was maximal in the place of a vibration node when the drilling axis was orthogonal to the bending plane (LT). EFEITOS DA ORIENTAÇÃO E DA POSIÇÃO DE UMA HETEROGENEIDADE LOCAL SOBRE AS FREQUENCIAS DE VIBRAÇÃO DE FLEXÃO DE VIGAS DE MADEIRARESUMO: Estudar a influência de um defeito sobre o comportamento dinâmico da madeira, a fim de detectar as heterogeneidades locais, é de grande importância em ensaios não destrutivos. As heterogeneidades naturais da madeira são orientadas em um volume. Entretanto, modelos unidimensionais ainda são utilizados para a caracterização dinâmica de vigas de madeira. Objetivou-se, neste estudo, investigar experimentalmente os efeitos da orientação e da posição de um defeito artificial nas frequências de vibração de flexão. Diferentes lotes de amostras de Fagus orientalis foram perfurados na direção radial, em cinco posições, ao longo do comprimento da amostra. Os ensaios dinâmicos em vibração de flexão livre foram realizados nas amostras antes e depois da perfuração nos planos de flexão longitudinal-radial (LR) e longitudinal-tangencial (LT). O comportamento em vibração de flexão livre foi diferente em função da posição e da orientação da heterogeneidade. Quando o eixo de perfuração estava no plano de flexão (LR), o enfraquecimento das frequências foi máximo, no local de um antinode de vibração. O deslocamento de frequência, apresentou comportamento contrário, ou seja, foi máximo na zona de um nó de vibração, quando o eixo de perfuração era ortogonal em relação ao plano de flexão (LT).

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Identification of defect position in a wooden beam from the power spectrum of longitudinal vibration

Cited by 16 publications

References 5 publications

Identification of the Severity and Position of a Single Defect in a Wooden Beam

Identification of the Severity and Position of a Single Defect in a Wooden Beam

Automated process planning and cost estimation under material quality uncertainty

Orientation and Position Effects of a Local Heterogeneity on Flexural Vibration Frequencies in Wooden Beams

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