An equivalent fluid model based finite-difference time-domain algorithm for sound propagation in porous material with rigid frame

作者：Zhao, Jing^*; Bao, Ming; Wang, Xiaolin; Lee, Hyojin; Sakamoto, Shinichi

来源：Journal of the Acoustical Society of America, 2018, 143(1): 130-138.

DOI：10.1121/1.5020268

• ACOUSTIC-WAVE PROPAGATION
• FREQUENCY RANGE
• ELASTIC WAVES
• MEDIA
• TORTUOSITY
• AIR

An equivalent fluid model based finite-difference time-domain algorithm is proposed to simulate the frequency characteristic of porous material with rigid frame. The rigid-frame porous material is replaced by an equivalent fluid characterized by the effective density and the effective bulk modulus, which reflect the viscous effects and thermal effects in the porous material, respectively. The effective density and the effective bulk modulus are frequency-dependent complex values, which are designed in the form of infinite impulse response filters in the frequency domain. The Z transform theory is used to discretize the frequency-domain wave equations. The accuracy of the proposed algorithm is preliminarily validated by good agreement between the calculated and measured normal-incidence sound absorption coefficients of two samples composed of different multiple-layered materials in a wide frequency range.

• 出版日期2018-1
• 单位中国科学院声学研究所