The Evaluation of Deviation in Sound Absorption Coefficient for Micro – perforated Panel

Jafar, Nur Arafah; Ooi, Lu Ean; Mazlan, Ahmad Zhafran Ahmad; Seng, K. H. C.; Tan, Jinglu

doi:10.1088/1757-899x/815/1/012009

Cited by 3 publications

(1 citation statement)

References 15 publications

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“…This can be observed when the reflected sound energy is lower than the incident sound energy. The absorption comes from an MPP's acoustic impedance which consists of resistance (real) and reactance (imaginary) components [17]. In the case where the incident sound wavelength is greater than the perforation diameter and perforation distance, the acoustic impedance of a perforation can be defined as [18]:…”

Section: Theory Of Mppmentioning

confidence: 99%

Effect of Thickness and Perforation Size on the Acoustic Absorption Performance of a Micro-Perforated Panel

et al. 2021

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In current times, noise pollution is especially apparent in urban areas due to rapid development in transportation, industrialization, and urbanization. The worsening noise pollution is detrimental to human health and behaviour as it can contribute to disorders and psychological disturbance. Thus, noise regulation is crucial and must be addressed with immediate effect. Micro-perforated panels (MPP) can be a potential solution to mitigate noise on a commercial scale. Researchers have addressed the mechanics behind the enhancement of acoustic absorption through micro-perforation and some suggestions have been made, such as the effect of structural variation on sound absorption performance. Hence, this research aims at optimizing the sound absorption performance of an MPP by determining the connection between thickness and perforation size with sound absorption coefficient. Three cases were considered: (i) varying perforation size, (ii) varying thickness, and (iii) varying perforation size and thickness simultaneously. Based on the Maa prediction model, the sound absorption performance for all three cases have been simulated through the MATLAB software. Results show that the increase in both thickness and perforation size together increases the peak value of sound absorption coefficient (SAC). It also shifts the peak towards the higher frequency region and narrows the bandwidth. The findings of this study indicate the potential of thick MPPs as commercial sound absorbers by adjusting the size of perforations. Thicker and sturdier MPPs with optimal acoustic resistance and reactance can act as reliable sound absorbers for sound insulation purposes.

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Section: Theory Of Mppmentioning

confidence: 99%

Effect of Thickness and Perforation Size on the Acoustic Absorption Performance of a Micro-Perforated Panel

et al. 2021

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Resistance end correction factor of microperforated panel made using additive manufacturing

Jafar

Ooi

Ripin

et al. 2021

Engineering Science and Technology, an International Journal

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Dependence of the Michelson Interferometer-Based Membrane-Less Optical Microphone–Photoacoustic Spectroscopy Gas-Sensing Method on the Fundamental Parameters of a Photoacoustic Gas Cell

Wang,

Yetisen,

Wang

et al. 2023

Photonics

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This article presents a mathematical model of the Michelson interferometer (MI)-based membrane-less optical microphone (MeoM)–photoacoustic spectroscopy (MeoM–PAS) method, which is also referred to as MI-based photoacoustic interferometry (PAI), for gas-sensing applications in complex and adverse environments, as it offers a completely static measurement system and the separation of a photoacoustic (PA) gas cell from the measuring system. It also investigates the dependence of this method on the fundamental parameters of a cubical PA gas cell using axial PA signals. The results indicate that the phase of the method is a sine function of the distance between the two light beams and a power exponent of the cell length, the cell height, and the distance between the excitation source and the nearest light beam, under the condition that the PA gas cell is resonant and that the excitation source is at the position of the peak or valley of the PA signals. It is at its maximum when the distance between the two light beams is approximately half the wavelength of the PA signals under the same conditions. In addition, the dependence of a PA gas cell using non-axial PA signals is described under the conditions that the PA gas cell is resonant, which is consistent with the changing aforementioned parameters for the distance between the two light beams, the cell length and height, and the distance between the excitation source and the nearest light beam. Furthermore, the selection of five common materials (aluminum, brass, glass, quartz, and stainless steel) for the PA gas cell is discussed under the influence of temperature fluctuations outside the PA gas cell, noise inside and outside the PA gas cell, as well as thermal and viscous losses inside the PA gas cell. The results indicate that quartz and stainless steel are promising options. Finally, the parameters related to the sensitivity enhancement of the method are analyzed using mathematical models, where the sensitivity of the method can be theoretically enhanced by reducing the dimensions of the PA gas cell.

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The Evaluation of Deviation in Sound Absorption Coefficient for Micro – perforated Panel

Cited by 3 publications

References 15 publications

Effect of Thickness and Perforation Size on the Acoustic Absorption Performance of a Micro-Perforated Panel

Effect of Thickness and Perforation Size on the Acoustic Absorption Performance of a Micro-Perforated Panel

Resistance end correction factor of microperforated panel made using additive manufacturing

Dependence of the Michelson Interferometer-Based Membrane-Less Optical Microphone–Photoacoustic Spectroscopy Gas-Sensing Method on the Fundamental Parameters of a Photoacoustic Gas Cell

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