Sound absorption model of foam glass-ceramics based on microstructure

• Published in: Journal of non-crystalline solids Vol. 604; p. 122136
• Main Authors: Cai, Liangping, Tian, Jian, Feng, Keqin, Liu, Yanfang, Jiang, Qiaoling
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.03.2023
• Subjects: Foam glass-ceramics; Johnson-Allard model; Microcrystals; Sound absorption model; Sound absorption model; Johnson-Allard model; Microcrystals; Foam glass-ceramics
• ISSN: 0022-3093; 1873-4812
• DOI: 10.1016/j.jnoncrysol.2023.122136

•Study of foam glass-ceramics for sound barriers on traffic networks.•Three sub-structure factors were introduced to modify Johnson-Allard model.•Sound absorption model of foam glass-ceramics was established. Foam glass-ceramics have the characteristics of broadband sound absorption, lightweight and high-strength, which can be utilized in sound barriers on traffic networks. Due to the complexity of microstructure, there is no sound absorption model suitable for foam glass-ceramics at present. In order to realize the prediction of sound absorption performance, a sound absorption model based on Johnson-Allard model was studied in this paper. The results show that the sound absorption coefficient of foam glass-ceramics only can be accurately predicted by Johnson-Allard model in a relatively low frequency band (500∼1250 Hz). Therefore, to broaden the applicability of the model to acoustic frequencies, three sub-structure factors were introduced to modify Johnson-Allard model with the influence of microstructure on the sound absorption performance fully considered. The results show that the modified Johnson-Allard model has high accuracy in predicting the sound absorption coefficient of foam glass-ceramics in the full frequency band of traffic network noise.