2017 journal article

Sound insulation of multi-layer glass-fiber felts: Role of morphology

TEXTILE RESEARCH JOURNAL, 87(3), 261–269.

co-author countries: China 🇨🇳 United States of America 🇺🇸
author keywords: sound insulation; glass-fiber felt; multi-layer; air-layer
Source: Web Of Science
Added: August 6, 2018

Glass-fiber felts have emerged as a popular material for noise reduction. This paper investigates the effect of various morphologies (micro-layer, macro-layer and air-layer) of glass-fiber felts on sound insulation. The sound transmission loss is measured by a Brüel & Kjár (B&K) impedance tube. The results show that the sound insulation of glass-fiber felts can be improved by increasing the number of macro-layers. The comparison between the macro- and micro-layer of glass-fiber felts on sound insulation is systematically carried out. Notably, the sound transmission loss of glass-fiber felts with similar areal density and thickness favors macro-layer structures over micro-layer structures. A simple model is established to explain this phenomenon. In addition, the sound transmission loss exhibits period fluctuations due to the presence of the air-layer between glass-fiber felts, which can be theoretically explained by the resonance effect. It is found that sound transmission loss can be improved by increasing the number of air-layers.