한국음향학회:학술대회논문집 (Proceedings of the Acoustical Society of Korea Conference)
- 한국음향학회 2001년도 추계학술발표대회 논문집 제20권 2호
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- Pages.223-226
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- 2001
Acoustic Characteristics of Sand Sediment Slab with Water- and Air-filled Pore
- Roh Heui-Seol (Acoustics Research Laboratory and BK21 Physics Research Division, Department of Physics, Sung Kyun Kwan University) ;
- Lee Kang Il (Acoustics Research Laboratory and BK21 Physics Research Division, Department of Physics, Sung Kyun Kwan University) ;
- Yoon Suk Wang (Acoustics Research Laboratory and BK21 Physics Research Division, Department of Physics, Sung Kyun Kwan University)
- 발행 : 2001.11.01
초록
Acoustic pressure transmission coefficient and phase velocity are measured as the functions of water porosity and air porosity in sand sediment slabs with water- and air-filled pores. Pores in the sand sediment slab we modeled as the structure of circular cylindrical tube shape filled with water and air. The first kind(fast) wave and second kind (slow) wave, identified by Biot, in the solid and fluid mixed medium are affected by the presence of water and air pores. Acoustic characteristics of such porous medium in water are also theoretically investigated in terms of the modified Biot-Attenborough (MBA) model, which uses the separate treatment of viscosity effect and thermal effect in non-rigid porous medium with water- and air-filed pores. The information on the fast waves introduces new concepts of the generalized tortuosity factor and dynamic shape factor.
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