| 凌嘉贇,Reza Javidan.浑水中兆赫频率的声衰减实验研究[J].声学技术,2004,(3):193~195 |
| 浑水中兆赫频率的声衰减实验研究 |
| Megahertz acoustic attenuation in fluidized mud |
| 投稿时间：2004-03-10 修订日期：2004-06-28 |
| DOI： |
| 中文关键词: 声衰减 兆赫频率 浑水 |
| 英文关键词: acoustic attenuation megahertz frequency fluidized mud |
| 基金项目:上海市科学发展基金项目(025907017) |
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| 中文摘要: |
| 文章报道了浑水中的声衰减的实验研究结果,超声波的频率分别为1、2、3、4、5MHz。实验表明:在同一个含沙量M的浑水中,声衰减系数β大致随频率ƒ的增加而线性增加;对同一个频率ƒ,声衰减系数β大致随含沙量M的增加而线性增加;在同一个频率ƒ和相同含沙量M的情况下,声衰减系数β随泥沙粒径的增加而增加。 |
| 英文摘要: |
| An experimental study of megahertz acoustic attenuation in fluidized mud has been made respectively in Shanghai Acoustics Laboratory, Chinese Academy of Sciences and in University of Sydney, Australia. The frequencies f of sound waves are 1、2、3、4、5 MHz. The experimental results show that as an approximation, (1) β increases linearly with ƒ for a same M, (2) β increases proportionally with M for a same ƒ, and (3) β increases with grain size of sediments for same ƒ and M, where β- the acoustic attenuation in dB/m, M- the sediment concentration in kg/m3. |
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