Realization of a thin and broadband microperforated panel (MPP) sound absorber

Prasetiyo, Iwan; Sihar, Indra; Sudarsono, Anugrah Sabdono

doi:10.1016/j.apacoust.2021.108295

Cited by 25 publications

(7 citation statements)

References 36 publications

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“…With the advancement of processing technology, the use of laser perforation and 3D printing technology to produce ultra-micro-pore structure [15], unconventional shape of the back cavity and other structures can also broaden the sound absorption band [16][17][18][19]. In addition, the combination of MPP and high strength honeycomb core (Sound liner) [20], the combination of MPP and porous material [21,22], the adjustable structure with increasing adjustment system [23,24], the super surface design with tortuous back cavity [25] and acoustic superstructures designed using micro-perforated plates [26][27][28] all provide new ideas for low frequency and broadband noise reduction of MPP structure.…”

Section: Introductionmentioning

confidence: 99%

Broaden the sound absorption band by using micro-perforated plate back cavities with different cross-sectional areas

Yan

Zhang

et al. 2023

Phys. Scr.

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In finite size micro-perforated plate structure, the cross-sectional area size of back cavity will affect the resonant frequency of structure. Based on transfer matrix and the characteristics of acoustic propagation in variable cross-section channel, the sound absorption characteristics of the double-layer micro-perforated plate structure with variable cross-section back cavity are studied and analyzed, and a theoretical analysis model of the variable cross-section back cavity micro-perforated plate structure is established. By comparing the theoretical model with the finite element model, the effect of abrupt changes in the cross-sectional area of the back cavity on the noise reduction performance is obtained. As for the double-layer micro-perforated plate in this paper, the bigger the cross-sectional area of back cavity of inner micro-perforated plate, the lower the frequency of first peak absorption coefficient of structure will be and the higher the frequency corresponding to second absorption coefficient peak of structure. Utilizing this feature, a combined micro-perforated plate structure is designed, which has back cavities with different inner cross-sectional areas, and ultimately broadening the structural sound absorption band. Additionally, through using 3D printing technology to produce samples and conducting experimental tests in the impedance tube. Experiments show that the structure can achieve an absorption coefficient of more than 0.8 within the frequency range of 500-1650 Hz, which further improving the noise reduction performance of the MPP structure. The feasibility of variable-sectional back cavity structure for the design of low-frequency and broadband noise reduction absorber is verified.

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Section: Introductionmentioning

confidence: 99%

Broaden the sound absorption band by using micro-perforated plate back cavities with different cross-sectional areas

Yan

Zhang

et al. 2023

Phys. Scr.

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“…They have also proposed more compact configuration by arranging different MPPs in parallel (Mosa et al, 2019(Mosa et al, , 2020Prasetiyo et al, 2016;Qian and Zhang, 2022) and also using turned double layer MPP (Zhao and Lin, 2022). Previous studies have tried to modify the backing air cavity into L-shaped cavities (Gai et al, 2017); coiled cavities (Prasetiyo et al, 2021;Wu et al, 2022); subcavities with different dimensions arranged in parallel (Guo and Min, 2015). Dividing backing cavities into sub-cavities are effectively arranging an MPP-cavity system with different Helmholtz resonant frequencies in parallel.…”

Section: Introductionmentioning

confidence: 99%

Bandwidth widening for sound absorption of a flexible microperforated panel backed by a multi-frequency panel-type resonator

Yeang

Halim

2023

Journal of Vibration and Control

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A microperforated panel (MPP) often suffers from a limited absorption bandwidth and poor sound absorption in the low frequency range. The present study aimed to propose an MPP-panel-type resonator (PR) compound structure that can simultaneously widen the half-absorption bandwidth and improve the poor absorption at the low frequency range. A vibroacoustic model is developed and compared to finite element simulations to demonstrate its accuracy. The vibration characteristics of the compound structure and the surface impedance are analyzed to reveal the mechanism forming the absorption characteristics of an MPP-PR structure. It is found that backing an MPP with a panel-type resonator (PR) creates a low frequency absorption peak but followed by an absorption valley that decreases the absorption bandwidth. The analysis showed that the phase difference between velocity of air particles in perforation and the PR panel velocity dictates the absorption characteristics associated with the PR resonance. A multi-resonators panel-type resonator (MPR) is found that the absorption valley associated with the host panel resonance splits into multiple smaller amplitude absorption dips improving absorption performance. The proposed MPP-MPR compound structure demonstrated a relatively wider half-absorption bandwidth with improved low frequency absorption.

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“…Aimed for a wide absorption bandwidth; many studies have been presented on a single layer MPP using various techniques. This includes the presents of the MPP model with incompletely partitioned cavities (Huang et al, 2017) broadband MPP model with ultra-MPP (Qian et al, 2014a); thin MPP models (Prasetiyo et al, 2021), inhomogeneous MPP systems with multiple cavity depths (Prasetiyo et al, 2016;Mosa et al, 2019;Kusaka et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

An Empirical Model for Optimizing the Sound Absorption of Single Layer MPP Based on Response Surface Methodology

Esraa¹,

putra²,

Mosa³

et al. 2022

IJTech

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Micro-perforated panel (MPP) is a thin panel absorber capable of absorbing sound energy at a targeted frequency range by adjusting the MPP parameters. An analytical model is available, but it is not a direct, convenient method for practitioners to determine the required MPP parameters. This paper presents an optimized empirical model to calculate the sound absorption coefficient of a single-layer MPP. The response surface methodology is employed for a simple case to generate a second-order polynomial model through a sequence of designing processes to analyze the functional relationships and variation of the outcome performance (sound absorption coefficient) concerning the MPP parameters, namely the panel thickness, hole diameter, perforation ratio, and the depth of the back air layer. The analysis is carried out for frequencies between 300 to 900 Hz. The predicted data (empirical) is compared with the actual data (analytical), leading to a coefficient of variation of 0.145%. The proposed empirical model can be used as a method to select the suitable MPP parameters according to the targeted frequency bandwidth of absorption with less computational time.

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Realization of a thin and broadband microperforated panel (MPP) sound absorber

Cited by 25 publications

References 36 publications

Broaden the sound absorption band by using micro-perforated plate back cavities with different cross-sectional areas

Broaden the sound absorption band by using micro-perforated plate back cavities with different cross-sectional areas

Bandwidth widening for sound absorption of a flexible microperforated panel backed by a multi-frequency panel-type resonator

An Empirical Model for Optimizing the Sound Absorption of Single Layer MPP Based on Response Surface Methodology

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