国防科技大学学报2012，Vol.34Issue(1)：19-23,5.
MgSO4弛豫吸收对水下强声波脉冲传播的影响分析
Analysis of the effects of MgSO4 relaxation on the propagation of underwater intensive acoustic pulse
摘要
Abstract
Based on the spectrum analysis of the experimental intensive acoustic pulse waveform using FFT, the current research found that the dominating energy of the spectrum is below 100 kHz. It is well known that one of the chemical compositions in sea water, MgSO4 , will cause excessive absorption of acoustic energy due to its chemical relaxation. Starting from a modified equation of state, with special consideration of the relaxation absorption of MgSO4 in seawater, a new wave propagation equation of intensive acoustic pulse was deduced. Combined with the numerical algorithm, the propagation process of the pulse was simulated and the effects of MgSO4 relaxation on waveform and spectrum were analyzed. The results indicate that relaxation process will flatten and smooth the steep pulse waveform, and reduce the acoustic energy to low frequency end. The chemical relaxation effects will cause extra loss of the pulse energy, in addition to the geometric spreading effects of pulse wavefront.关键词
强声波脉冲/MgSO4/弛豫吸收Key words
intensive acoustic pulse/ MgSO4 / relaxation absorption分类
信息技术与安全科学引用本文复制引用
张军,曾新吾,王一博,陈聃..MgSO4弛豫吸收对水下强声波脉冲传播的影响分析[J].国防科技大学学报,2012,34(1):19-23,5.基金项目
国家部委资助项目 （）
