Equivalent modulus method for finite element simulation of the sound absorption of anechoic coating backed with orthogonally rib-stiffened plate. (31st March 2016)

• Record Type: Journal Article
• Authors: Jin, Zhongkun; Yin, Yao; Liu, Bilong
• Is Part Of: Journal of sound and vibration. Volume 366(2016)
• Page Start: 357
• Page End: 371
• Publication Date: 2016-03-31
• Subjects: finite element method -- homogenization -- sound absorption -- anechoic coating -- orthogonally rib-stiffened -- equivalent modulus; Sound -- Periodicals; Vibration -- Periodicals; Son -- Périodiques; Vibration -- Périodiques; Sound; Vibration; Periodicals; Electronic journals; 620.205
• DOI: 10.1016/j.jsv.2015.12.031
• Languages: English
• ISSNs: 0022-460X

Abstract

Abstract: The finite element method is often used to investigate the sound absorption of anechoic coating backed with orthogonally rib-stiffened plate. Since the anechoic coating contains cavities, the number of grid nodes of a periodic unit cell is usually large. An equivalent modulus method is proposed to reduce the large amount of nodes by calculating an equivalent homogeneous layer. Applications of this method in several models show that the method can well predict the sound absorption coefficient of such structure in a wide frequency range. Based on the simulation results, the sound absorption performance of such structure and the influences of different backings on the first absorption peak are also discussed.