Improvement of sound insulation of doors or windows by absorption treatment inside the peripheral gaps

Takumi Asakura, Shinichi Sakamoto

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


Slit-shaped gaps included in building elements such as doors or windows are apt to deteriorate the sound insulation performance of the wall system. In order to reduce sound energy transmitted through these parts, one of the practical measures is to place sound absorption materials inside the gaps. In this study, the effect of such an absorption treatment was examined through numerical and experimental studies. In the numerical study, the effect of sound absorption treatment inside the gaps existing around doors/windows was examined by applying the finite-difference timedomain (FDTD) method. To examine the results of the numerical study, a full-scale model experiment was performed with the sound intensity measurement method. In addition, a case study was performed to confirm the effect of absorption treatment of the peripheral gap of a door set in a real office space, and the effect was also confirmed by numerical study and measurement. As a result, it was found that sound insulation degradation caused by sound transmission through the gaps can be improved by sound absorption treatment inside the gaps.

Original languageEnglish
Pages (from-to)241-252
Number of pages12
JournalAcoustical Science and Technology
Issue number4
Publication statusPublished - 2013


  • Absorption treatment
  • Finite-difference time-domain method
  • Gap
  • Leak transmission


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