Title:
SOUND ABSORPTION DEVICE PROVIDED WITH TUNNEL MICRO ATMOSPHERIC PRESSURE WAVE REDUCTIVE FUNCTION
Document Type and Number:
Japanese Patent JP2004052274
Kind Code:
A
Abstract:
To provide a sound absorption device provided with a tunnel micro atmospheric pressure wave reductive function.
A porous sound absorption plate 2 is installed along an internal wall in the vicinity of a tunnel entrance and supported through a spring 10 to constitute a vibration system having the sound absorption plate 2 as a chief mass body. The natural frequency of the vibration system is set in 3-5Hz which is dominant frequency of the tunnel micro atmospheric pressure wave.
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Inventors:
HARA TADAHIKO
SEKI SHIRO
SEKI SHIRO
Application Number:
JP2002208160A
Publication Date:
February 19, 2004
Filing Date:
July 17, 2002
Export Citation:
Assignee:
MITSUBISHI HEAVY IND LTD
International Classes:
E01F8/00; E21D9/14; G10K11/16; G10K11/162; (IPC1-7): E21D9/14; E01F8/00; G10K11/16; G10K11/162
Attorney, Agent or Firm:
Tadashi Takahashi
Masatake Shiga
Masakazu Aoyama
Masatake Shiga
Masakazu Aoyama
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