Source directivity approximation for finite-difference time-domain simulation by estimating initial value

Daiki Takeuchi, Kohei Yatabe, Yasuhiro Oikawa

Research output: Contribution to journalArticle

2 Citations (Scopus)


In order to incorporate a directive sound source into acoustic simulation using the finite-difference time-domain method (FDTD), this paper proposes an optimization-based method to estimate the initial value which approximates a desired directional pattern after propagation. The proposed method explicitly considers a discretized FDTD scheme and optimizes the initial value directly in the time domain so that every effect of the discretization error of FDTD, including numerical dispersion, is taken into account. It is also able to consider a frequency-wise directivity by integrating the Fourier transform into the optimization procedure, even though the estimated result is defined in the time domain. After the optimization, the obtained result can be utilized in any acoustic simulation based on the same FDTD scheme without modification because the result is represented as the initial value to be propagated and no additional procedure is required.

Original languageEnglish
Pages (from-to)2638-2649
Number of pages12
JournalJournal of the Acoustical Society of America
Issue number4
Publication statusPublished - 2019 Apr 1


ASJC Scopus subject areas

  • Arts and Humanities (miscellaneous)
  • Acoustics and Ultrasonics

Cite this