Heterogeneously perforated honeycomb-corrugation hybrid sandwich panel as sound absorber

Tang, Yufan; Li, Feihao; Xin, Fengxian; Lu, Tian Jian

doi:10.1016/j.matdes.2017.09.006

Cited by 71 publications

(32 citation statements)

References 31 publications

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“…The results show that the 15 mm Placuna placenta composite with STCT has its peak at 0.42 at 0.9 kHz, while the 30 mm one has its peak at 0.81 at 1.9 kHz. Comparing to the research by Tang et al, that a thinner honeycomb patterned panel has more effective absorption capabilities than the others, this result tends to agree with the study conducted by Tang et al [38]. The cavity location inside the sample causes the sound energy to be saved longer than for any samples of cavity in the material surface.…”

Section: Surface Design Treatment Of Placuna Placenta Sfrp On Absorptsupporting

confidence: 87%

“…Continuing on the discussion about the front-tailed cavity treatment, Figure 8 illustrates a significant difference when the 15 mm and 30 mm Placuna composite with FTCT reaches the peak 0.85 and 0.64 respectively at frequencies 2.5-3.0 kHz. Comparing other studies conducted by Tang et al, Xiao-dan et al, Gai et al, and Carbajo et al, this finding agrees with their theories regarding the thin acoustic panel on sound absorption performances[36,38,41,43].…”

supporting

confidence: 91%

“…Several studies on surface design treatment in samples to improve acoustic performance have been carried out by a number of researchers [36][37][38][39][40]. Tang et al studied on a hybrid-perforated honeycomb patterned sandwich panel which effectively absorbs sound in low frequencies.…”

Section: Surface Design Treatment Of Placuna Placenta Sfrp On Absorptmentioning

confidence: 99%

“…Tang et al studied on a hybrid-perforated honeycomb patterned sandwich panel which effectively absorbs sound in low frequencies. Numerical simulation was used to establish the theoretical model of sound absorption and bending stiffness [38]. Furthermore, since the MPP structure is not effective for low frequencies, Xiao-dan et al proposed a parallel mechanical impedance structure arranged in the cavity of MPP to improve its absorption capabilities in low frequencies.…”

Section: Surface Design Treatment Of Placuna Placenta Sfrp On Absorptmentioning

confidence: 99%

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On the Role of Acoustical Improvement and Surface Morphology of Seashell Composite Panel for Interior Applications in Buildings

et al. 2019

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This manuscript focuses on the acoustical behaviors and surface morphology of seashell waste filler reinforced polyester (SFRP) coverings Anadara granosa Linn, Perna viridis Linn, and Placuna placenta Linn and applications in buildings. Their acoustical performances were observed using an impedance tube using a technique with two and four microphones based on ASTM E1050-98 and ASTM E2611-09. The improvements of acoustical performance were conducted by a coupled resonator inclusion with addition of a fibrous dacron layer and back cavity. The experimental results showed that the resonators and back cavity on the material structure were able to shift the absorption ability at low frequency. The promising wide broadband frequencies performance occurred when the 15 mm Placuna placenta FRP treated with front-tailed cavity without any additional fibrous layer and air gap started from 0.2 at 2.0 kHz. The combination of resonators and fibrous layer on the material structure was able to stabilize the sound transmission loss (STL) in 52–56 dB at a high frequency. On the observation of the simple surface morphology material, it was found that Placuna placenta Linn had the highest damping performances due to the smallest pores and the most carbon compound compared to the others. Therefore, this finding is very useful for building applications.

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Section: Surface Design Treatment Of Placuna Placenta Sfrp On Absorptsupporting

confidence: 87%

supporting

confidence: 91%

Section: Surface Design Treatment Of Placuna Placenta Sfrp On Absorptmentioning

confidence: 99%

Section: Surface Design Treatment Of Placuna Placenta Sfrp On Absorptmentioning

confidence: 99%

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On the Role of Acoustical Improvement and Surface Morphology of Seashell Composite Panel for Interior Applications in Buildings

et al. 2019

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“…Low frequency noise generated in ground and aerospace vehicles provide a harsh environment for passengers and crews and generally cause severe health issues under long-term exposure. Passive and active treatments have been widely used recently to control noise [1][2][3][4][5][6][7][8][9][10][11][12] . Compared with active methods 12 , passive methods are simpler, cheaper, and more practical without requiring hardware and power sources associated with active systems.…”

Section: Introductionmentioning

confidence: 99%

On sound insulation of pyramidal lattice sandwich structure

Liu

Chen

Zhang

et al. 2019

Composite Structures

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Pyramidal lattice sandwich structure (PLSS) exhibits high stiffness and strength-to-weight ratio which can be effectively utilized for designing light-weight load bearing structures for ranging from ground to aerospace vehicles. While these structures provide superior strength to weigh ratio, their sound insulation capacity has not been well understood. The aim of this study is to develop numerical and experimental methods to fundamentally investigate the sound insulation property of the pyramidal lattice sandwich structure with solid trusses (PLSSST). A finite element model has been developed to predict the sound transmission loss (STL) of PLSSST and simulation results have been compared with those obtained experimentally. Parametric studies is then performed using the validated finite element model to investigate the effect of different parameters in pyramidal lattice sandwich structure with hollow trusses (PLSSHT), revealing that the pitching angle, the uniform thickness and the length of the hollow truss and the lattice constant have considerable effects on the sound transmission loss. Finally a design optimization strategy has been formulated to optimize PLSSHT in order to maximize STL while meeting mechanical property requirements. It has been shown that STL of the optimal PLSSHT can be increased by almost 10% at the low-frequency band. The work reported here provides useful information for the noise reduction design of periodic lattice structures. Numerical SimulationThe FE model of the PLSSST has been developed in commercial software LMS Virtual.Lab 11. Direct acoustic vibration coupling theory available in the LMS Virtual.Lab is utilized to study the STL behavior of PLSSST. The three-dimensional (3D) models of PLSSST, the reverberation chamber, and the anechoic chamber are, first, built in CATIA (the related geometric parameters are summarized in Table S1) and saved as Initial Graphics Exchange Specification (IGES) files, and then they are imported into Altair HyperMesh for meshing. The element type for the panel and the rod are Pshell and Psolid, respectively; while the reverberation chamber and the anechoic chamber are occupied by Tetrahedral elements. PLSSST is modeled by 421,024 elements with a nominal maximum size of 1 mm and 466,130 nodes.The material of PLSSST is aluminium with the material density, Young's modulus, and Poisson ration as 2810 Kg/mm 3 , 71 GPa, and 0.33, respectively. The loss factor of the panel and the bar are set to be 0.0001 and 0.4, respectively, considering that viscoelastic materials would be used to bond the bar and the panel. In FE model, two acoustic grids are established on both sides of the sandwich structure to simulate the reverberation chamber and the anechoic chamber. The reverberation chamber and the anechoic

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Additively Manufactured Deformation‐Recoverable and Broadband Sound‐Absorbing Microlattice Inspired by the Concept of Traditional Perforated Panels

Zhai

2021

Advanced Materials

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unattended to, prolonged exposure leads to acute and chronic health hazards and complications such as hearing loss, cardiovascular diseases, cognitive impairment, etc. [1] Sound absorbing materials hence find widespread adoption in a diverse range of applications. For reference, the market value for acoustic materials has been constantly increasing and it is projected to be 16 billion U.S. dollars in 2025, nearly doubling that in 2015. [2] Traditional and commercial sound absorbers in the market have always been focused on foams, fibrous materials, fabric, and perforated panels. [3] However, limitations of the traditional absorbers exist, for instance, such as non-optimal designs, lack of structural rigidity, and health hazards (from synthetic fibers), etc. As such, increasing research efforts have been placed on the investigations of new materials and new meta-structures for novel and better performing sound absorbers. [4] Several examples of new materials investigated as sound absorbers include graphene-based foams, [5] shape memory foams, [6] window foams, [7] and aerogels. [8] However, material-based absorbers compare generally pale in performance to structure-based ones under similar specifications (e.g., thickness, target frequency). Further, such materials also usually lack the rigidity of structures and some may also pose potential health hazards. In turn, structure-based absorbers are more robust and notable successes have been achieved with superior absorption capabilities and broadened absorption range shown. Examples of novel absorbing structures investigated include the Fabry-Perot channel assembly, [9] planar coiled tubes, [10] perforated composite resonators, [11] membrane structures, [12] and shrinking duct structures, [13] etc. Despite the success, the mentioned examples nonetheless are still limited to a structural level-they lack the design flexibilities for an overall system or product.As such, it would be of high research interests to design absorbers based on the principles of structural designs, but yet to down-scale them to a size domain in the range of materials. The advent of additive manufacturing (AM) in the recent years has brought about such possibilities. Apart from being an effective rapid-prototyping tool and a viable manufacturing Noise pollution is a highly detrimental daily health hazard. Sound absorbers, such as the traditionally used perforated panels, find widespread applications. Nonetheless, modern product designs call for material novelties with enhanced performance and multifunctionality. The advent of additive manufacturing has brought about the possibilities of functional materials design to be based on structures rather than chemistry. With this in mind, herein, the traditional concept of perforated panels is revisited and is incorporated with additive manufacturing for the development of a novel microlattice-based sound absorber with additional impact resistance multifunctionality. The structurally optimized microlattice presents excellent broadband absorption with a...

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Heterogeneously perforated honeycomb-corrugation hybrid sandwich panel as sound absorber

Cited by 71 publications

References 31 publications

On the Role of Acoustical Improvement and Surface Morphology of Seashell Composite Panel for Interior Applications in Buildings

On the Role of Acoustical Improvement and Surface Morphology of Seashell Composite Panel for Interior Applications in Buildings

On sound insulation of pyramidal lattice sandwich structure

Additively Manufactured Deformation‐Recoverable and Broadband Sound‐Absorbing Microlattice Inspired by the Concept of Traditional Perforated Panels

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