Application of the wave and finite element method to predict the acoustic performance of double-leaf cross-laminated timber panels

Fenemore, Chiaki; Kingan, Michael J.; Mace, Brian

doi:10.1177/1351010x231162483

Cited by 3 publications

(2 citation statements)

References 21 publications

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“…The sound absorbers of the anechoic chamber could be flat, 4 wedge, 5 conical, 6 or pyramidshaped. 1 Wave method, 7 numerical methods (like the finite element method 6,7 and finite difference time-domain method 8 ) and experimental methods (including measuring the sound absorption coefficient of perpendicular impact in the impedance tube [9][10][11][12] and the actual sound absorption coefficient in the reverberation room 1 ) can be used to determine the absorption coefficient of sound absorbers. To enhance the effectiveness of pyramid sound absorbers at absorbing sound, a novel design for this type of absorber is proposed in this paper.…”

Section: Introductionmentioning

confidence: 99%

Analysis and optimization of the chamfered pyramid and evaluation of geometrical parameters’ effect on its sound absorption coefficient

Moradi,

Basirjafari

2024

Building Acoustics

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Since symmetrical geometry makes it easier to arrange pyramid absorbers on anechoic chamber walls compared to wedge absorbers, the goal of this paper is to present an optimal pyramid-shaped absorber which, in addition to the optimal performance in sound absorption, has other advantages such as less thickness, lower material consumption and cost, easier construction, arrangement and maintenance and occupying less space compared to wedges. The COMSOL Multiphysics software was used to simulate the optimized sound absorber by using the genetic algorithm programed in MATLAB software, with the goal of a 100 Hz cut-off frequency. The results show that the optimized chamfered pyramid at the top performs better at sound absorption compared to the complete pyramid and wedge with 18% less thickness. Furthermore, the cut-off frequency decreased to 91 Hz when a gap of up to 15 mm was created between the adjacent absorbers mounted on the surface, which is desirable.

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Section: Introductionmentioning

confidence: 99%

Analysis and optimization of the chamfered pyramid and evaluation of geometrical parameters’ effect on its sound absorption coefficient

Moradi,

Basirjafari

2024

Building Acoustics

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“…Moreover, some articles, including Refs. [30][31][32][33][34][35][36], focused on theoretical estimations and evaluations based on measurements to predict the sound insulation properties of CLT elements. Lin et al [37] compared several calculation methods with the measurement results of CLT walls combined with frames and panels.…”

Section: Introductionmentioning

confidence: 99%

Effects of Building Height on the Sound Transmission in Cross-Laminated Timber Buildings—Vibration Reduction Index

Nilsson,

Ménard,

Bard

et al. 2023

Buildings

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High-rise wooden buildings are increasing in popularity, and they typically include cross-laminated timber in the structure. Taller buildings result in higher loads on the junctions lower down in the building, which are suggested in the literature to negatively affect the sound insulation. This study involved measurement of the vibration reduction index in four different CLT buildings, varying in height and junction details. A total of 12 junctions were measured at both high and low levels in the buildings. Among these, 10 junctions had resilient interlayers with different stiffnesses dependent on the designed quasi-permanent load, while 2 junctions lacked resilient interlayers. The results indicated that the vibration reduction index decreases lower down in the building mainly for the Wall–Wall path. The findings were consistent for all measured junctions above 400 Hz for the Wall–Wall path and for the majority of the measurements of the remaining frequency range, 400 Hz and below. The observed difference in the vibration reduction index could significantly impact the final result if a high-rise building has several flanking paths that affect the sound insulation between two apartments, and this needs to be considered during the design phase. Similar effects were shown for buildings both with and without resilient interlayers in the junctions.

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A hybrid methodology for the frequency response function variability due to joint uncertainty

Kara,

Ferguson

2023

Mechanical Systems and Signal Processing

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Application of the wave and finite element method to predict the acoustic performance of double-leaf cross-laminated timber panels

Cited by 3 publications

References 21 publications

Analysis and optimization of the chamfered pyramid and evaluation of geometrical parameters’ effect on its sound absorption coefficient

Analysis and optimization of the chamfered pyramid and evaluation of geometrical parameters’ effect on its sound absorption coefficient

Effects of Building Height on the Sound Transmission in Cross-Laminated Timber Buildings—Vibration Reduction Index

A hybrid methodology for the frequency response function variability due to joint uncertainty

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