Sound absorption performance of the acoustic absorber fabricated by compression and microperforation of the porous metal

Panfeng Bai; Xiaocui Yang; Xinmin Shen; Xiaonan Zhang; Zhizhong Li; Qin Yin; Guoliang Jiang; Fei Yang

Materials & Design (Apr 2019)

Sound absorption performance of the acoustic absorber fabricated by compression and microperforation of the porous metal

Panfeng Bai,
Xiaocui Yang,
Xinmin Shen,
Xiaonan Zhang,
Zhizhong Li,
Qin Yin,
Guoliang Jiang,
Fei Yang

Affiliations

Panfeng Bai: Department of Mechanical Engineering, College of Field Engineering, Army Engineering University, No. 1 Haifu Street, Nanjing, Jiangsu 210007, China
Xiaocui Yang: Department of Mechanical Engineering, College of Field Engineering, Army Engineering University, No. 1 Haifu Street, Nanjing, Jiangsu 210007, China
Xinmin Shen: Department of Mechanical Engineering, College of Field Engineering, Army Engineering University, No. 1 Haifu Street, Nanjing, Jiangsu 210007, China; State Key Laboratory in Ultra-precision Machining Technology, Department of Industrial and Systems Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong, China; Correspondence to: X. Shen, Department of Mechanical Engineering, College of Field Engineering, Army Engineering University, No. 1 Haifu Street, Nanjing, Jiangsu 210007, China.
Xiaonan Zhang: Department of Mechanical Engineering, College of Field Engineering, Army Engineering University, No. 1 Haifu Street, Nanjing, Jiangsu 210007, China; Corresponding author.
Zhizhong Li: Department of Mechanical Engineering, College of Field Engineering, Army Engineering University, No. 1 Haifu Street, Nanjing, Jiangsu 210007, China
Qin Yin: Department of Mechanical Engineering, College of Field Engineering, Army Engineering University, No. 1 Haifu Street, Nanjing, Jiangsu 210007, China
Guoliang Jiang: Department of Mechanical Engineering, College of Field Engineering, Army Engineering University, No. 1 Haifu Street, Nanjing, Jiangsu 210007, China
Fei Yang: Department of Mechanical Engineering, College of Field Engineering, Army Engineering University, No. 1 Haifu Street, Nanjing, Jiangsu 210007, China

Journal volume & issue: Vol. 167

Abstract

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Novel acoustic absorbers were fabricated by the compression and microperforation of the porous metal, which aimed to develop practical acoustic absorbers for the noise reduction. Sound absorbing coefficients of the five investigated acoustic absorbers were measured by the AWA6128A detector according to the standing wave method, and their trends were consistent with normal sound absorption principle of the porous metal absorber and that of the microperforated panel absorber. The results proved that with same length of the cavity, sound absorption performance could be obviously improved by the compression and microperforation. When length of the cavity was 20 mm, average sound absorbing coefficient of the compressed and microperforated porous metal panel absorber in frequency range 100–6000 Hz reached 59.69%, which was superior to that 25.70% of original porous metal absorber and that 31.49% of the microperforated spring steel panel absorber. In the constructed semi-empirical model, a fourth-order polynomial function was treated as the coupling function to express the superposition absorption effect, and its veracity and reliability was validated by two replication experiments. Micromorphology of the compressed and microperforated porous metal panel provided the intuitive explanations to the improvement of its sound absorption performance. Keywords: Sound absorption performance, Porous metal, Compression, Microperforation, Superposition absorption effect, Micromorphology

Published in Materials & Design

ISSN: 0264-1275 (Print); 1873-4197 (Online)
Publisher: Elsevier
Country of publisher: United Kingdom
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials
Website: https://www.journals.elsevier.com/materials-and-design

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