Acoustical Science and Technology | |
Treatment of boundary conditions by finite difference time domain method | |
Akira Omoto1  Hisaharu Suzuki1  Kyoji Fujiwara1  | |
[1] Faculty of Design, Kyushu University | |
关键词: FDTD; Surface impedance; Rayleigh model; | |
DOI : 10.1250/ast.28.16 | |
学科分类:声学和超声波 | |
来源: Acoustical Society of Japan | |
【 摘 要 】
References(8)Cited-By(6)In this paper, we propose a simple method that considers boundary conditions in a finite difference time domain (FDTD) scheme by varying density, sound speed and flow resistance. A method based on a Rayleigh model is also proposed, and by these methods, we can design the frequency characteristics of normal incident absorption coefficient arbitrarily. These methods have three advantages: 1. easy coding, 2. easy designing of a frequency characteristic of normal incident absorption coefficient and 3. easy configuration of material thickness. For example, by our method, we can simulate the sound field in a reverberation chamber with a thick material such as glass wool. To confirm the accuracy of the model used, we compare the normal incident absorption coefficient with a one-dimensional exact solution. Results show that the model is sufficiently accurate. Although our method requires a high cost for calculation power and memory, a practical increase in elapsed time can be ignored. This method provides an easy way of analyzing the inner region of a material.
【 授权许可】
Unknown
【 预 览 】
Files | Size | Format | View |
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RO201912080715594ZK.pdf | 386KB | download |