Normal Incidence of Sound Transmission Loss from Perforated Plates with Micro and Macro Size Holes

Putra, Azma; Ismail, Ahmad Yusuf

doi:10.1155/2014/534569

Cited by 8 publications

(8 citation statements)

References 14 publications

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“…From 9.93 dB, STC decreased to 8.6 dB as a result of the 2 mm wide perforation (PETNF-0.3-30-2D) and further dropped to 8.1 dB as the hole diameter reached 3 mm (PETNF-0.3-30-3D). The drop in the STC is expected where increasing the perforation ratio decreases the transmission loss. − This phenomenon has already been established and is apparent at higher frequencies . In the case of PETNF-0.3-30-1D, the decrease in STC is also evident, where it dropped to 9.75 dB.…”

Section: Resultsmentioning

confidence: 68%

“…57−59 This phenomenon has already been established and is apparent at higher frequencies. 58 In the case of PETNF-0.3-30-1D, the decrease in STC is also evident, where it dropped to 9.75 dB. However, the increase in its STC value at above 2000 Hz is noticeable compared to PETNF-0.3-30-2D and PETNF-0.3-30-3D taking PETNF-0.3−30 as the baseline.…”

Section: Resultsmentioning

confidence: 99%

“…This activity is analogous to mircoperforated panels where the holes are at the submillimeter scale (<1 mm). Microperforations enhance the sound insulation property of the material such that it creates a resistive force which restricts the motion of the air inside the holes, resulting in a stiffness-controlled regime . By controlling the hole diameter below 1 mm, we can actually enhance further the transmission loss performance of the PETNF aerogel at high frequencies, but we may, on the other hand, limit the sound absorption of the PETNF aerogel.…”

Section: Resultsmentioning

confidence: 99%

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Double-Porous PET Waste-Derived Nanofibrous Aerogel for Effective Broadband Acoustic Absorption and Transmission

Puguan

Pornea

Ruello

et al. 2022

ACS Appl. Polym. Mater.

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A flexible nanofibrous aerogel with laser-cut perforations was developed for effective sound absorption and insulation. Polyethylene terephthalate (PET) waste bottles were turned into uniform nanofibers (NFs) via an electrospinning technique that were subsequently processed to create a 3D porous network through a freeze-drying method. Reinforcing the aerogel with glutaraldehyde-cross-linked poly(vinyl alcohol) (PVA) allowed mechanical flexibility resulting in a Young's modulus of 2.28 × 10 −2 MPa. The highly tortuous pore structure produced by the densely packed nanosized fibers permitted a noise reduction coefficient (NRC) of 0.37 (at areal density of 465 g m −2 ). Likewise, the overall transmission loss is increased as nanofibers are used instead of microfibers. In terms of sound insulation performance, a standard transmission class (STC) of 6.1 dB, which is about 10 times that of a commercial polyurethane-based acoustic foam, is displayed by the PETNF aerogel. Moreover, the creation of perforations further enhanced the material's sound absorption such that an NRC of 0.54 (at areal density of 930 g m −2 ) was obtained, which is similar to or greater than that of most fiber-based acoustic materials previously reported. By changing the perforation diameter, one can tune its overall acoustic performance. In addition, utilizing a waste-derived material for noise pollution control alleviates the generation of plastic waste that is detrimental to the environment.

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Section: Resultsmentioning

confidence: 68%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Double-Porous PET Waste-Derived Nanofibrous Aerogel for Effective Broadband Acoustic Absorption and Transmission

Puguan

Pornea

Ruello

et al. 2022

ACS Appl. Polym. Mater.

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“…𝑃 1 = 𝐴𝑒 𝑗 𝜔𝑡 −𝑘𝑥 1 + 𝐵𝑒 𝑗 𝜔𝑡 −𝑘𝑥 1 (1) 𝑃 2 = 𝐴𝑒 𝑗 𝜔𝑡 −𝑘𝑥 2 + 𝐵𝑒 𝑗 𝜔𝑡 −𝑘𝑥 2 (2) 𝑃 3 = 𝐶𝑒 𝑗 𝜔𝑡 −𝑘𝑥 3 + 𝐷𝑒 𝑗 𝜔𝑡 −𝑘𝑥 3 (3) 𝑃 4 = 𝐶𝑒 𝑗 𝜔𝑡 −𝑘𝑥 4 + 𝐷𝑒 𝑗 𝜔𝑡 −𝑘𝑥 4 (4) where k is the wave number. By settling Equation (1) to Equation (4), the accompanying Equation (5) to Equation (8) gotten through the computation will be in the unit of decibels (dB).…”

Section: Load Balancing and Transfer Functionsmentioning

confidence: 99%

A Narrowing Analysis on Sound Loss during Transmission on Perforated Natural Fiber Panels

Sahu¹

2022

MSEA

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Sound transmission misfortune (STL) is a learn about the sound energy that is kept from communicating through a wall or a parcel, it is fundamental, particularly for clamor protection applications. The principal point of this study is to explore and dissect the STL ability of punctured normal fiber sandwich boards, which went about as sound protection material. The target of this study is to decide the impact of hole width of the punctured board on STL, as well as to decide the ideal hybridization blend sandwich board of punctured board with normal fiber that conveys great STL. In this review, STL estimation was done by utilizing a two-load impedance tube strategy combined with LMS Test Lab programming and LMS SCADAS Mobile DAQ framework. Normal filaments utilized in this study are coconut fiber, oil palm fiber, and pineapple leaf fiber. The normal filaments were ready in round and hollow shapes with three unique thicknesses of 1 cm, 2 cm, and 3 cm to squeeze into the example holder of the impedance tube. Every regular fiber will be tried after it was hybridized with a punctured board of various hole breadth sizes and the STL estimation results are gotten and investigated. The estimation results show all examples had reached their most noteworthy STL at the recurrence range 3000 Hz to 4000 Hz. Furthermore, pineapple leaf fiber hybridized with a punctured board of 3 mm's whole breadth is viewed as the ideal blend where it accomplished the most noteworthy STL of 71.80 dB among all the test tests.

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“…In sound controlling applications, perforated panels are usually used in controlling the noise from a sound source. The perforations on the panels able to reduce the surface volume velocity of a vibrating structure and the structural noise radiation [5]. For a perforated panel, the thickness, perforations size and perforations porosity will affect the STL.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Sound Transmission Loss on Perforated-Natural Fibre Sandwich Panels

Tan¹,

Ak²

2020

JMechE

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Sound transmission loss (STL) is a study about the sound energy that is prevented from transmitting through a wall or a partition, it is essential especially for noise insulation applications. The main aim of this study is to investigate and analyse the STL capability of perforated-natural fibre sandwich panels, which acted as sound insulation material. The objective of this study is to determine the effect of perforation diameter of perforated panel on STL, as well as to determine the optimum hybridisation combination sandwich panel of perforated panel with natural fibre that deliver good STL. In this study, STL measurement was carried out by using two-load impedance tube method coupled with LMS Test Lab software and LMS SCADAS Mobile DAQ system. Natural fibres used in this study are coconut fibre, oil palm fibre, and pineapple leaf fibre. The natural fibres were prepared in cylindrical shape with three different thicknesses of 1 cm, 2 cm, and 3 cm to fit into the sample holder of impedance tube. Each natural fibre will be tested after it was hybridised with a perforated panel of different perforation diameter size and the STL measurement results are obtained and analysed. The measurement results show all samples had reached their highest STL at the frequency range 3000 Hz to 4000 Hz. In addition, pineapple leaf fibre hybridised with a perforated panel of 3mm’s perforation diameter is considered the optimum combination where it achieved the highest STL of 71.80 dB among all the test samples.

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Normal Incidence of Sound Transmission Loss from Perforated Plates with Micro and Macro Size Holes

Cited by 8 publications

References 14 publications

Double-Porous PET Waste-Derived Nanofibrous Aerogel for Effective Broadband Acoustic Absorption and Transmission

Double-Porous PET Waste-Derived Nanofibrous Aerogel for Effective Broadband Acoustic Absorption and Transmission

A Narrowing Analysis on Sound Loss during Transmission on Perforated Natural Fiber Panels

Analysis of Sound Transmission Loss on Perforated-Natural Fibre Sandwich Panels

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