3D Printed Thick Micro-Perforated Panel with Graded Perforation for Practical Wall Sound Absorption Applications

IF 1.7 4区物理与天体物理

Acoustics Australia Pub Date : 2023-09-13 DOI:10.1007/s40857-023-00303-x

Mohamed Shafeer P.P, Jeyaraj Pitchaimani, Mrityunjay Doddamani

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Abstract

In recent years, noise pollution has been recognized as a significant environmental issue, and using sustainable materials as sound-absorbing building materials have drawn considerable attention. The influence of graded perforations on the acoustic characteristics of a 3D printed bio-degradable thick micro-perforated panel (MPP) having graded perforation and made of Poly Lactic Acid is presented. Thicker panels are considered owing to the mechanical strength required for practical wall applications. A fused deposition modeling based 3D printer is used to fabricate the MPPs with graded cylindrical perforations and different patterning of perforations. The sound absorption coefficient is measured using the impedance tube technique and compared with theoretical results obtained using an equivalent electro-acoustic model. Results revealed that for normal incidence, the absorption coefficient is only dependent on the overall perforation ratio of the panel, irrespective of the perforation gradation and patterning of perforation. This gives the freedom to distribute the perforation aesthetically for interior wall application. This work also proposes the effective perforation ratio approach to predict the sound absorption coefficient (SAC) of MPPs with graded perforation. For multi-thickness MPPs and MPPs with linearly graded thickness, improved sound absorption characteristics were observed both in terms of bandwidth of absorption and peak value of SAC compared to the conventional constant thickness MPPs.

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具有分级穿孔的 3D 打印厚微穿孔板，适用于实际墙壁吸音应用

近年来，噪声污染已被认为是一个重要的环境问题，使用可持续材料作为吸音建筑材料已引起广泛关注。本文介绍了分级穿孔对由聚乳酸制成的 3D 打印生物可降解厚微孔板（MPP）声学特性的影响。考虑到实际墙体应用所需的机械强度，我们采用了较厚的面板。使用基于熔融沉积建模技术的三维打印机制造了具有分级圆柱穿孔和不同穿孔图案的微穿孔板。使用阻抗管技术测量了吸声系数，并将其与使用等效电声模型获得的理论结果进行了比较。结果表明，在正常入射情况下，吸声系数只取决于面板的整体穿孔率，而与穿孔的等级和穿孔的图案无关。这为内墙应用提供了美观的穿孔分布自由度。这项研究还提出了有效穿孔率方法，用于预测具有分级穿孔的 MPP 的吸音系数（SAC）。与传统的恒定厚度 MPP 相比，多厚度 MPP 和线性分级厚度 MPP 在吸声带宽和 SAC 峰值方面的吸声特性都有所改善。

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来源期刊

Acoustics Australia ACOUSTICS-

自引率

5.90%

发文量

期刊介绍： Acoustics Australia, the journal of the Australian Acoustical Society, has been publishing high quality research and technical papers in all areas of acoustics since commencement in 1972. The target audience for the journal includes both researchers and practitioners. It aims to publish papers and technical notes that are relevant to current acoustics and of interest to members of the Society. These include but are not limited to: Architectural and Building Acoustics, Environmental Noise, Underwater Acoustics, Engineering Noise and Vibration Control, Occupational Noise Management, Hearing, Musical Acoustics.