Journal of South China University of Technology (Natural Science Edition) ›› 2011, Vol. 39 ›› Issue (4): 135-139,162.doi: 10.3969/j.issn.1000-565X.2011.04.024

• Electronics, Communication & Automation Technology • Previous Articles     Next Articles

 Attenuation Ability Influenced by Amount and Attenuation Coefficient of Perfectly-Matched Layers in Acoustic FDTD Method

Huang Kun-peng  Zhao Yue-zhe   

  1. 1.State Key Laboratory for Geomeehanics and Deep Underground Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China;2.Department of Civil EngineeringfKey Laboratory of Civil Engineering Safety and Durability of the Education of Ministry,Tsinghua University,Beijing 100084,China
  • Received:2010-09-07 Revised:2010-12-29 Online:2011-04-25 Published:2011-03-01
  • Contact: 黄坤朋(1980-)，男，博士生，主要从事声场仿真研究 E-mail:ohmycar@163.com
  • About author:黄坤朋(1980-)，男，博士生，主要从事声场仿真研究
  • Supported by:

    国家自然科学基金资助项目(50938003)

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Abstract:

This paper deals with the acoustic absorbing ability affected by the amount and attenuation coefficient of perfectly-matched layers（PML） in acoustic finite-difference time-domain（FDTD） method,and establishes a PML boundary model for the absorbing ability analysis.The results indicate that（1） the layer amount and the attenuation coefficient relate to each other;（2） more PML layers may result in high absorbing ability but heavy computation burden;（3） when the layer amount is unchanged,appropriate attenuation coefficient should be set for each attenuation layer for the purpose of decreasing the numerical reflection due to the difference in attenuation coefficient;and（4） in practical applications,suitable layer amount and attenuation coefficient should be determined by comprehensively considering the calculation complexity and accuracy.

Key words: finite-difference time-domain(FDTD), perfectly matched layer(PML), attenuation coefficient