• Title, Summary, Keyword: 차음주파수대

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Wind Pressure Reducing Soundproof Wall Which Has Many Holes on the Surface and Selectable Stop-Frequency Ranges (표면에 다수의 구멍을 뚫고 차단 주파수 영역의 선택이 가능한 풍압저감형 방음벽)

  • Kim, Sang-Hoon;Lee, Donchool
    • Journal of The Korean Society of Civil Engineers
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    • v.36 no.2
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    • pp.191-196
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    • 2016
  • Applying diffraction of waves and muffler principle, the theory of macroscopic air ventilation with soundproofing was explained. Soundproofing frequency range can be selected by this method. The sound wave was attenuated at the resonator located between double-layered walls. A soundproof plate was designed and the experiment was processed. There are two air holes of diameter of 5cm and thickness of 8cm on the surfaces per each soundproofing cell. There was a transmission loss of about 25dB and it is more than at least 10dB compared with that of the Comnex technology of wave cancellation by air holes in Japan. Furthermore, there was no soundproof frequency selection in the Comnex technology.