哈尔滨工程大学学报2018，Vol.39Issue(2)：193-199,7.DOI:10.11990/jheu.201703012
海水弛豫效应对有限振幅声波传播的影响
Effect of seawater relaxation on propagation of finite amplitude acoustic wave
摘要
Abstract
To study the influence of the seawater relaxation effect on the finite amplitude sound propagation, the propagation model and the acoustic Reynolds number in relaxation medium are obtained by adding the modified terms of the relaxation processes to Burgers equation. When the frequency of the acoustic wave is far less than the relaxation frequency of the medium,a numerical simulation is conducted for the finite amplitude sound propagation, and the relaxation effect caused by magnesium sulfate on the sound propagation is analyzed. Results show that the formation of shock wave in seawater has certain threshold. The shock wave is formed when the acoustic Reynolds number exceeds the threshold, and excessive absorption caused by the relaxation effect delays formation of the shock wave. In addition,the amplitude of the shock wave attenuates as the distance increases,and the shock wave will not be formed when the acoustic Reynolds number below the threshold.关键词
弛豫效应/有限振幅声波/逾量吸收/色散/冲击波/数值算法/阈值条件Key words
relaxation effect/finite amplitude acoustic wave/excessive absorption/dispersion/shock wave/numer-ical algorithms/threshold condition分类
海洋科学引用本文复制引用
杨德森,胡诗涌,时洁,时胜国,张昊阳,刘庆..海水弛豫效应对有限振幅声波传播的影响[J].哈尔滨工程大学学报,2018,39(2):193-199,7.基金项目
国家自然科学基金项目(11674074). （11674074）
