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Science and Technology of Energetic Materials

Vol.64, No.3 (2003)

Research paper

Decrease of infrasound pressure by blasting(*in Japanese)
Hisaaki Fukui, Minoru Takahashi, and Masaaki Yamamoto
p.126-132

Abstract

For the purpose of decreasing Infrasound Pressure occurred by blasting, New Model of Sound Screen is investigated. This Sound Screen is composed by Roll Layer of Air Capsule Sheet made from polyethylene. Slurry explosive of 50 g charged in Ballistic Chamber is initiated toward small size tunnel (1.6 m Dia. x 6.6 m Length) and above Screen is set with it's opposite site. After blasting, it is measured that sound pressure level is decreases about 20 dB at 16 Hz center frequency behind 10 m remote of the Screen. To confirm this effect, the following experiment is carried out by Acoustic Method.
This Screen is set for the partition between Reverberation Room and Anechoic Room.
By putting out Infrasound Frequency restricted 5 - 50 Hz range by loud speaker, it is also confirmed that Sound Pressure Level decreases about 11 - 14 dB behind 50 cm point from the partition in Anechoic Room.

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