Analysis of a wooden specimen's mechanical properties through acoustic measurements in the very near field

Pantelić, Filip; Mijic, Miomir; Pavlovic, Dragana Sumarac; Ridley-Ellis, Daniel; Dudeš, Danica

doi:10.1121/10.0001030

Cited by 3 publications

(1 citation statement)

References 13 publications

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“…Contrary to this, to do near-field measurements means small changes in the position of the microphone resulting in large differences in the recorded response. By using this technique it is possible to achieve good visualization of mode shapes (Pantelić et al, 2020;Pantelić, Prezelj, 2014). The boundary of a VNF region is defined with the frequency and the distance of two adjacent nodes.…”

Section: Introductionmentioning

confidence: 99%

Archives of Acoustics

2022

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The aim of this research is to use a simple acoustic method of a very near field recording, which enables measurement and display of oscillation modes, to estimate the velocity of flexural waves, based on the wavelengths of standing waves measured on the sample. The paper analyses cases of 1D geometry, flexural waves that occur on a beam excited by an impulse. Measurements were conducted on two different samples: steel and a wooden beam of the same length. Due to the appearance of evanescent waves at the boundary regions, the distance between the nodes of standing waves that occur deviates from half the wavelength, which can be compensated using a correction factor. Cases of fixed and free boundary conditions were analysed. By quantifying how much the boundary conditions change the mode shape function, it can be predicted how the mode of oscillation changes if the boundary conditions change, which can also find application in musical acoustics and sound radiation analysis.

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Section: Introductionmentioning

confidence: 99%

Archives of Acoustics

2022

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Wood hole-damage detection and classification via contact ultrasonic testing

Mousavi

Gandomi²

2021

Construction and Building Materials

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Dynamic modulus of elasticity in flexural vibration tests of Pinus sylvestris sawn timber obtained with fundamental resonant frequency and overtones

Villasante

Fernández-Serrano

2022

Holzforschung

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The use of resonant frequency is presently one of the most used non-destructive testing (NDT) methods to predict the mechanical properties of sawn timber. In most cases, only the first vibration mode is used to estimate the static modulus of elasticity (MOES). The use of other vibration modes (overtones) can improve the predictive capacity of this NDT. In this study, the dynamic modulus of elasticity (MOEdyn) obtained from the fundamental flexural resonant frequency and overtones of 38 structural size samples (2000 × 100 × 70 mm3) of Pinus sylvestris were analysed. The study was complemented with 16 small size samples (1000 × 20 × 8.7 mm3) of the same species to know the shear effect in samples with a very high length-to-depth ratio. For the structural size samples, a 6% decrease in the MOEdyn was detected each time the vibration mode increased. Using the second or third vibration mode offered lower errors in the prediction of the MOES than the fundamental resonant frequency. The lowest MOES prediction errors were obtained combining various vibration modes through power regression. This regression turned out to be a simple alternative to avoid the shear effect in the calculation of the MOEdyn.

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Analysis of a wooden specimen's mechanical properties through acoustic measurements in the very near field

Cited by 3 publications

References 13 publications

Archives of Acoustics

Archives of Acoustics

Wood hole-damage detection and classification via contact ultrasonic testing

Dynamic modulus of elasticity in flexural vibration tests of Pinus sylvestris sawn timber obtained with fundamental resonant frequency and overtones

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