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Experimental and Theoretical Analysis of Sound Absorption Properties of Finely Perforated Wooden Panels

1
Key Laboratory of Wood Science and Technology of State Forestry Administration, Research Institute of Wood Industry, Chinese Academy of Forestry, Beijing 100091, China
2
School of Technology, Beijing Forestry University, Beijing 100083, China
*
Author to whom correspondence should be addressed.
Academic Editor: Dinesh Agrawal
Materials 2016, 9(11), 942; https://doi.org/10.3390/ma9110942
Received: 21 October 2016 / Revised: 1 November 2016 / Accepted: 15 November 2016 / Published: 22 November 2016
Perforated wooden panels are typically utilized as a resonant sound absorbing material in indoor noise control. In this paper, the absorption properties of wooden panels perforated with tiny holes of 1–3 mm diameter were studied both experimentally and theoretically. The Maa-MPP (micro perforated panels) model and the Maa-Flex model were applied to predict the absorption regularities of finely perforated wooden panels. A relative impedance comparison and full-factorial experiments were carried out to verify the feasibility of the theoretical models. The results showed that the Maa-Flex model obtained good agreement with measured results. Control experiments and measurements of dynamic mechanical properties were carried out to investigate the influence of the wood characteristics. In this study, absorption properties were enhanced by sound-induced vibration. The relationship between the dynamic mechanical properties and the panel mass-spring vibration absorption was revealed. While the absorption effects of wood porous structure were not found, they were demonstrated theoretically by using acoustic wave propagation in a simplified circular pipe with a suddenly changed cross-section model. This work provides experimental and theoretical guidance for perforation parameter design. View Full-Text
Keywords: wooden perforated panels; tiny hole; relative impedance; sound absorption properties; base material characteristics wooden perforated panels; tiny hole; relative impedance; sound absorption properties; base material characteristics
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MDPI and ACS Style

Song, B.; Peng, L.; Fu, F.; Liu, M.; Zhang, H. Experimental and Theoretical Analysis of Sound Absorption Properties of Finely Perforated Wooden Panels. Materials 2016, 9, 942.

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