Investigations about periodic design for broadband increased sound transmission loss of sandwich panels using 3D-printed models

Errico, F.; Ichchou, Mohamed; Rosa, Sergio De; Franco, Francesco; Bareille, Olivier

doi:10.1016/j.ymssp.2019.106432

Cited by 19 publications

(6 citation statements)

References 27 publications

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“…Furthermore, the surface area of tubular voids present in Figure 4 e is 1.27 times the surface area of SM possible tubular voids in Figure 4 f. The increased surface area in products with intricate geometrical structures, such as the product presented in Figure 4 , could prove beneficial for the development of special-purpose, wood-based products. For example, the spacious tubular voids of complex LcVL-printed structures contain larger void surfaces and enable greater convenience for architecting desired tortuosity, which could improve sound absorption compared to standard SM possible structures [ 20 ]. Overall, as demonstrated by the printed product in Figure 4 , LcVL was able to properly realize the 3D model of the desired product to a satisfactory degree.…”

Section: Resultsmentioning

confidence: 99%

An Additive Manufacturing Method Using Large-Scale Wood Inspired by Laminated Object Manufacturing and Plywood Technology

Tao

Yin

2020

Polymers

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Wood-based materials in current additive manufacturing (AM) feedstocks are primarily restricted to the micron scale. Utilizing large-scale wood in existing AM techniques remains a challenge. This paper proposes an AM method—laser-cut veneer lamination (LcVL)—for wood-based product fabrication. Inspired by laminated object manufacturing (LOM) and plywood technology, LcVL bonds wood veneers in a layer-upon-layer manner. As demonstrated by printed samples, LcVL was able to retain the advantageous qualities of AM, specifically, the ability to manufacture products with complex geometries which would otherwise be impossible using subtractive manufacturing techniques. Furthermore, LcVL-product structures designed through adjusting internal voids and wood-texture directionality could serve as material templates or matrices for functional wood-based materials. Numerical analyses established relations between the processing resolution of LcVL and proportional veneer thickness (layer height). LcVL could serve as a basis for the further development of large-scale wood usage in AM.

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Section: Resultsmentioning

confidence: 99%

An Additive Manufacturing Method Using Large-Scale Wood Inspired by Laminated Object Manufacturing and Plywood Technology

Tao

Yin

2020

Polymers

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“…Optimization problems especially in the low frequency range have also been carried out by Zhang and Du [45] and Denli and Sun [156]. Core optimization of sandwich DPS in a wide frequency range has also been performed by [157]. Finally, Tsai et al [158] adopted a conjugate gradient optimization technique to calculate and optimize the material properties on the STL of composite plate.…”

Section: Optimization Of Sound Transmission Loss Of Double Panel Strumentioning

confidence: 99%

Comparative Study of Sound Transmission Losses of Sandwich Composite Double Panel Walls

2020

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The increasing motivation behind the recently wide industrial applications of sandwich and composite double panel structures stems from their ability to absorb sounds more effectively. Meticulous selection of the geometrical and material constituents of both the core and panels of these structures can produce highly desirable properties. A good understanding of their vibro-acoustic response and emission index such as the sound transmission loss (STL) is, therefore, a requisite to producing optimal design. In this study, an overview of recent advances in STL of sandwich and composites double panels is presented. At first, some salient explanation of the various frequency and controlled regions are given. It then critically examines a number of parameter effects on the STL of sandwich and composite structures. Literatures on the numerical, analytical and experimental solutions of STL are systematically presented. Efficient and more reliable optimization problems that maximize the STL and minimize the objective functions capable of degrading the effectiveness of the structure to absorb sounds are also provided.

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“…This model has been validated with two sandwich panels made of a single core [51]. They have been made using an industrial 3D printer.…”

Section: Extraction Of the Stl Of Mlctsmentioning

confidence: 99%

On the multi-scale vibroacoustic behavior of multi-layer rectangular core topology systems

Guenfoud

Droz

Ichchou

et al. 2020

Mechanical Systems and Signal Processing

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The present work deals with multi-layer rectangular core topology systems built up by stacking layers made of different rectangular core geometries. Multi-layer systems have been intensively studied in terms of mechanical performances whereas their vibroacoustic behavior, acoustic efficiency and design is however still an open issue. Several design parameters should be considered to fully understand the dynamic and acoustic behaviour of such structures. Therefore, this paper focuses on controlling the transition frequency and the Sound Transmission Loss (STL) by modifying geometrical parameters of the unit cell, while keeping the mass constant. Infinite panels and real wavenumbers will be considered in the study. The Wave Finite Element Method (WFEM) is used to obtain the targeted indicators. The proposed designs give the opportunity to shift the transition frequency and to control the flexural waves propagating in the structure. Besides, the STL is highly improved in the full frequency range of interest compared to a standard sandwich panel made of a single core.

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Investigations about periodic design for broadband increased sound transmission loss of sandwich panels using 3D-printed models

Cited by 19 publications

References 27 publications

An Additive Manufacturing Method Using Large-Scale Wood Inspired by Laminated Object Manufacturing and Plywood Technology

An Additive Manufacturing Method Using Large-Scale Wood Inspired by Laminated Object Manufacturing and Plywood Technology

Comparative Study of Sound Transmission Losses of Sandwich Composite Double Panel Walls

On the multi-scale vibroacoustic behavior of multi-layer rectangular core topology systems

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