China’s coastal waters are turbid and the properties of the seabed are complex. This negatively impacts the performance of underwater detection equipment. The properties of sound absorption in turbid water are not we...China’s coastal waters are turbid and the properties of the seabed are complex. This negatively impacts the performance of underwater detection equipment. The properties of sound absorption in turbid water are not well understood. In this paper, the coefficient of sound absorption in turbid water was measured by the reverberation technique. All work was done in a reverberation barrel made of seamless aluminum. First, pure water was poured into the reverberation barrel and its reverberation time measured. Next, various concentrations of turbid water were poured into the barrel and their reverberation time measured. After all data had been gathered, the coefficient of sound absorption in turbid water of different concentrations was calculated. From this we determined a law of sound absorption in turbid water as summarized in the paper.展开更多
Sound power determination of a source based on sound pressure measurements has been standardized internationally and that based on intensity measurements is in the process of standardization. The basic idea is that th...Sound power determination of a source based on sound pressure measurements has been standardized internationally and that based on intensity measurements is in the process of standardization. The basic idea is that the sound power emission of a source (machinery, equipment, etc.) is a characteristic constant of the source. A velocity monopole of strength q=Q exp(iωt) will emit a power ρf^2Q^2/2c in free space,展开更多
文摘China’s coastal waters are turbid and the properties of the seabed are complex. This negatively impacts the performance of underwater detection equipment. The properties of sound absorption in turbid water are not well understood. In this paper, the coefficient of sound absorption in turbid water was measured by the reverberation technique. All work was done in a reverberation barrel made of seamless aluminum. First, pure water was poured into the reverberation barrel and its reverberation time measured. Next, various concentrations of turbid water were poured into the barrel and their reverberation time measured. After all data had been gathered, the coefficient of sound absorption in turbid water of different concentrations was calculated. From this we determined a law of sound absorption in turbid water as summarized in the paper.
文摘Sound power determination of a source based on sound pressure measurements has been standardized internationally and that based on intensity measurements is in the process of standardization. The basic idea is that the sound power emission of a source (machinery, equipment, etc.) is a characteristic constant of the source. A velocity monopole of strength q=Q exp(iωt) will emit a power ρf^2Q^2/2c in free space,
