Influence of dimensions of wooden samples for determination of acoustic parameters and sound timbre

Nop, Patrik; Tippner, Jan

doi:10.1016/j.apacoust.2022.108895

Cited by 3 publications

(3 citation statements)

References 23 publications

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“…However, when sawing the sample, it is necessary to consider the grain angle of the soundboard splicing so as to not damage the test piece. Concurrently, this method imposes specific requisites on the magnitude of the sample [ 27 , 28 ]. In addition, it is challenging to assess the effect of the grain angle on the acoustic vibration characteristics of the soundboard.…”

Section: Introductionmentioning

confidence: 99%

Measurement and Analysis of the Vibration Responses of Piano Soundboards with Different Structures

He,

Liang,

Zhang

et al. 2024

Materials

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The effect of structure on the vibration response was explored for four piano soundboards with different but commonly adopted structures. The vibration response was obtained using the free-vibration method, and the values of the dynamic modulus of elasticity and dynamic shear modulus obtained using the free-vibration frequency method (EF and GF) were compared with the dynamic modulus of elasticity obtained using the Euler beam method (EE) and dynamic shear modulus obtained using the free-plate torsional vibration method (GT), respectively. It was found that the soundboards with different structures had different vibration modes and that excitation at different locations highlighted different vibration modes. For all the soundboards analyzed, the EE and GT were higher than EF and GF by 2.2% and 24.3%, respectively. However, the trends of the results of these methods were the same. The four piano soundboards with different structures possessed varying dynamic moduli of elasticity and dynamic shear moduli. These rules are consistent with the grain directions of the soundboards and the anisotropy of the wood (the direction of the units of the soundboards). The results show that the vibration mode of the piano soundboard is complex. The dynamic elastic modulus of the soundboard can be calculated using the Euler beam method. The results provide a reference for studies on the vibration response, material selection, production technology, and testing of piano soundboards.

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Section: Introductionmentioning

confidence: 99%

Measurement and Analysis of the Vibration Responses of Piano Soundboards with Different Structures

He,

Liang,

Zhang

et al. 2024

Materials

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“…Due to their versatility, different NDT techniques are used nowadays to estimate the static mechanical properties of timber and standing trees [14][15][16]. Some of these methods are based on vibro-acoustic properties such as stress wave velocity or frequency of vibrations [17,18], including FRT, which describes a number of dynamic parameters simultaneously [19][20][21]. With FRT, engineering constants such as the longitudinal dynamic modulus of elasticity (E dyn ), dynamic shear modulus (G), Poisson ratios (v), and MOED can be determined based on the response of the tested specimen to dynamic loading [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Determination of the Static Bending Properties of Green Beech and Oak Wood by the Frequency Resonance Technique

Nop,

Cristini,

Zlámal

et al. 2024

Forests

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This article discusses the non-destructive evaluation of the mechanical properties of green wood. To estimate the dynamic flexural modulus of elasticity (MOED), a non-destructive test (NDT) method—the frequency resonance technique (FRT)—was used. A three-point bending test was carried out to determine the static bending properties as the bending modulus of elasticity (MOE), the modulus of rupture (MOR), and bending toughness (Aw). This article presents the results of a study comparing the correlations between the dynamic and static bending parameters of beech (Fagus sylvatica L.) and oak (Quercus robur L.) wood, which was further divided into heartwood and sapwood. These species were chosen as the most widespread representatives of diffuse-porous and ring-porous hardwoods. This study found statistically significant differences in most mechanical parameters between the two species, except for MOR. Among the investigated parameters, beech had higher values than oak (by 22.1% for MOED, 9.5% for MOE, and 12.1% for Aw). Furthermore, relevant correlations (R > |0.7|) were established between MOED and between some of the static flexural parameters. These correlations were stronger for beech, which due to its more homogeneous structure showed less data variability than the ring-porous oak.

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“…Timbre is a foundational aspect of sound, which is naturally a conception with close ties to broadband sound and is commonly regarded as determined by the inherent characteristic of passive mechanical systems [1][2][3]. This is because timbre manipulation has been remaining challenging due to the dispersion nature of resonances that 4 These authors contributed equally to this work.…”

Section: Introductionmentioning

confidence: 99%

Meta-silencer with designable timbre

Wang

Zhou

Qiu

et al. 2023

Int. J. Extrem. Manuf.

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Timbre, as one of the essential elements of sound, plays an important role in determining sound properties, whereas its manipulation has been remaining challenging for passive mechanical systems due to the intrinsic dispersion nature of resonances. Here, we present a meta-silencer supporting intensive mode density as well as highly tunable intrinsic loss and offering a fresh pathway for designable timbre in broadband. Strong global coupling is induced by intensive mode density and delicately modulated with the guidance of the theoretical model, which efficiently suppresses the resonance dispersion and provides desirable frequency-selective wave-manipulation capacity for timbre tuning. As proof-of-concept demonstrations for our design concepts, we propose three meta-silencers with the designing targets of high-efficiency broadband sound attenuation, efficiency-controlled sound attenuation and designable timbre, respectively. The proposed meta-silencers all operate in a broadband frequency range from 500 to 3200 Hz and feature deep-subwavelength sizes around 50 mm. Our work opens up a fundamental avenue to manipulate the timbre with passive resonances-controlled acoustic metamaterials and may inspire the development of novel multifunctional devices in noise-control engineering, impedance engineering, and architectural acoustics.

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Influence of dimensions of wooden samples for determination of acoustic parameters and sound timbre

Cited by 3 publications

References 23 publications

Measurement and Analysis of the Vibration Responses of Piano Soundboards with Different Structures

Measurement and Analysis of the Vibration Responses of Piano Soundboards with Different Structures

Determination of the Static Bending Properties of Green Beech and Oak Wood by the Frequency Resonance Technique

Meta-silencer with designable timbre

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