Enhanced transmission loss in acoustic materials with micro-membranes. (15th January 2018)

• Record Type: Journal Article
• Authors: Li, Shengming; Mao, Dongxing; Huang, Sibo; Wang, Xu
• Is Part Of: Applied acoustics. Volume 130(2018)
• Page Start: 92
• Page End: 98
• Publication Date: 2018-01-15
• Subjects: Acoustical engineering -- Periodicals; Periodicals; 620.2
• DOI: 10.1016/j.apacoust.2017.08.027
• Languages: English
• ISSNs: 0003-682X

Abstract

Abstract: Due to their strong transmission loss (TL) at low frequencies, acoustic micro-membranes (AMMs) have been the subject of many studies. In this paper, a theoretical model for AMMs is established which gives a direct insight into their sound insulation qualities. Analysis of the model's acoustics shows how the sound insulation provided by a membrane can be significantly enhanced, and reveals the intrinsic characteristic of AMMs in mid-low frequency range. Further analysis on two AMMs separated by an air gap gives a quantitative description on how performance varies with the air gap. Using the theoretical model developed here, it is a straightforward matter to adjust an AMM's parameters to achieve a desired level of attenuation. This work opens the way for the potential application of AMMs in noise control engineering.