Resistance end correction factor of microperforated panel made using additive manufacturing

Jafar, Nur Arafah; Ooi, Lu Ean; Ripin, Zaidi Mohd; Ho, Kelvin; Yahaya, Ahmad Fazli

doi:10.1016/j.jestch.2021.03.015

Cited by 3 publications

(2 citation statements)

References 26 publications

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“…A considerably broader bandwidth of transmission loss was also observed at a frequency below 1500 Hz. The discrepancies could be attributed to the perforations in the printed structures that were not perfectly circular in shape, as reported by Jafar et al 41 This imperfect perforation condition of the cascaded cylindrical MPP would influence the measured acoustic properties and cause them to deviate from the TMM model. 48 Another reason for the difference between the model and the measured result is the TMM approach that assumed a perfectly axisymmetrical structure.…”

Section: Resultsmentioning

confidence: 85%

“…Although fused deposition moulding has limited accuracy in producing a consistent micro-perforation geometry according to design, the irregular circular geometry of micro-perforations increases the sound absorption level. 41 In this work, the most economical AM process of fused deposition moulding was deployed in the manufacturing of the relatively intricate structure of a cylindrical MPP. For cylindrical MPPs, the application of absorbing sound from a flow system in a circular duct is an attractive proposition, primarily in machinery and appliances where airflow is involved.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of acoustic performance of cascaded cylindrical micro-perforated panel

Alisah

Ooi

Ripin

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part L:

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A cylindrical micro-perforated panel (MPP) can be used to absorb the sound of a flow system in a circular duct of a vacuum cleaner. A cascaded cylindrical MPP is a special class type where two cylindrical MPPs are arranged in a series to improve sound attenuation. The manufacturing of MPP primarily involves the machining of micro-perforations, because small holes are not readily made using injection moulding due to the complexity of the die, flow control of the molten polymer through the small orifices and dimensional stability, making it unsuitable for mass production. This limitation can be overcome with the use of additive manufacturing (AM) technology, where the micro-perforations can be designed and manufactured, with relatively larger tolerances. Experimental validation ensures that the manufactured prototype in this study is performed according to design. Results show that the transmission loss of the model and the experimental outcomes agree. The cascaded arrangement of the cylindrical MPP results in a wider effective frequency range and an increased transmission loss. Parametric studies of the combined effects of the perforation diameter, perforation ratio and the depth of air cavity on the diameter of the duct and length ratio are conducted using a transfer matrix method. A case study is demonstrated here in the design. Moreover, an AM of cascaded cylindrical MPP is performed to attenuate peak noise at 1650 Hz, where the optimum parameters of the cascaded cylindrical MPP are obtained using a genetic algorithm. The manufactured cascaded cylindrical MPP is installed on a vacuum cleaner duct, and the measurement of sound power level shows a reduction of 4 dB(A).

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Section: Resultsmentioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Evaluation of acoustic performance of cascaded cylindrical micro-perforated panel

Alisah

Ooi

Ripin

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part L:

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Sound absorption characteristics of 3‐dimensional printed biodegradable structure backed with luffa fiber

Tyagi,

Jha,

Tripathi

et al. 2024

Materialwissenschaft Werkst

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In this work, an investigation has been carried out on the sound absorption properties of the microperforated composites prepared by filling natural luffa fiber and synthetic luffa fiber. These composite structures are created by 3‐dimensional printing of polylactic acid, which exhibits excellent biodegradability. After preparing the structure, the micro‐perforation is done at the top of the composite with the help of a heated cylindrical drill. During the printing process, the infill density (printing parameter) and type of luffa fiber (natural and synthetic) have been varied to find out its effect on acoustic properties. Finally, a comparative study is carried out among natural luffa fiber and without using natural luffa fiber. The results showed excellent sound absorption of luffa filled structure compared to an unfilled structure. Out of three different infilled densities, the density of 5 % revealed a maximum amount of absorption, suggesting the potential applications of these structures in the field of sound absorption.

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Surface roughness impact on the performance of the 3D metal printed waveguide coupler at millimeterwave band

Almeshehe

Murad

Rahim

et al. 2022

Engineering Science and Technology, an International Journal

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Resistance end correction factor of microperforated panel made using additive manufacturing

Cited by 3 publications

References 26 publications

Evaluation of acoustic performance of cascaded cylindrical micro-perforated panel

Evaluation of acoustic performance of cascaded cylindrical micro-perforated panel

Sound absorption characteristics of 3‐dimensional printed biodegradable structure backed with luffa fiber

Surface roughness impact on the performance of the 3D metal printed waveguide coupler at millimeterwave band

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