Free vibration of both-ends clamped wooden beams: is it potentially applicable as an in situ assessment method?

Attia, Hazem Ali

doi:10.3906/tar-1111-22

Cited by 2 publications

(1 citation statement)

References 21 publications

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“…2b) to produce the pulse signal. As the sampling frequency is an important task (Roohnia et al 2013;Sobue et al 2010), it was fixed at 3.2 KHz, and there were 2048 sampling points. The mechanical static bending apparatus used in this study conforms to the national standard of the People Republic of China (GB/T 17657-1999).…”

Section: Methodsmentioning

confidence: 99%

Detection and Location of Defects in Laminated Veneer Lumber by Wavelet Package Analysis

Zhu¹,

Liu²

2014

BioResources

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Large numbers of vibration signals of wood-based panels are unsteady and complicated, which means that detection can be difficult. The wavelet transform is an effective method to detect these signals, which are otherwise difficult to detect using the Fast Fourier Transform (FFT). This paper presents a study on nondestructive detection of bubble defects seen in poplar laminated veneer lumber (LVL) using a combination of modal analysis and wavelet transform. The energy spectrum of wavelet packet decomposition due to a vibration signal is investigated. The vibration nondestructive test is used to study the relationship between bubble and changes of LVL physical properties. Results show that a bubble defect leads to a variation of energy dissipation in LVL vibration, and it is mode-dependent. For relatively small bubbles, the bubble-induced changes in natural frequencies are too small to be detected by the nondestructive method. However, by analyzing the energy spectrum of wavelet packet decomposition, smaller bubbles can be detected using the nondestructive vibration signals. The position and degree of defects can be ascertained by the wavelet packet energy curvature method at the same time.

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Section: Methodsmentioning

confidence: 99%

Detection and Location of Defects in Laminated Veneer Lumber by Wavelet Package Analysis

Zhu¹,

Liu²

2014

BioResources

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Boundary layer flow and heat transfer in a micropolar fluid past a permeable at plate

Hossain

Roy

Hossain

2013

Theor appl mech (Belgr)

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An analysis is performed to study the shear stress, the couple-stress and heat transfer characteristics of a laminar mixed convection boundary layer flow of a micropolar fluid past an isothermal permeable plate. The governing nonsimilar boundary layer equations are analyzed using the (i) series solution for small ?, (ii) asymptotic solution for large ? and (iii) primitive-variable formulation and the stream function formulation are being used for all ?. The effects of the material parameters, such as, the vortex viscosity parameter, K, and the transpiration parameter, s, on the shear stress, the couple-stress and heat transfer have been investigated. The agreement between the solutions obtained from the stream-function formulation and the primitive-variable formulation is found to be excellent.

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Free vibration of both-ends clamped wooden beams: is it potentially applicable as an in situ assessment method?

Cited by 2 publications

References 21 publications

Detection and Location of Defects in Laminated Veneer Lumber by Wavelet Package Analysis

Detection and Location of Defects in Laminated Veneer Lumber by Wavelet Package Analysis

Boundary layer flow and heat transfer in a micropolar fluid past a permeable at plate

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