摘要
在三维情况下研究了分层介质中Rayleigh和Love面波的能量分布问题，分析了多层介质中柱面面波的能量传播特性．面波是声源与介质分界面相互作用的结果，其能流密度随深度增加很快衰减，但在一定深度处出现极大和极小值．通过数值分析发现只有当径向距离较大时，面波能量传播的速度才等于其群速度．文中还考查了频率、深度、介质层状结构等参数对能量分布的影响．
In this paper, the problem of energy distribution of Rayleigh and Love waves in stratified media is investigated in three dimensions. The characteristic of energy propagation of cylindrical surface waves is analyzed in three dimensions. Surface waves are result of the interaction of the source with the interfaces. The power flux of the surface waves decays as the depth increases, and the maximum and minimum of the power flux possibly appears in some depths. With the numerical study it is found that the propagation velocity of energy of the surface wave is equal to that of the group velocity when the radial distance tends towards infinite. The effect to the energy distribution caused by frequency, depth, structure of the medium, and other parameters is also analyzed in the paper.
出处
《声学学报》
EI
CSCD
北大核心
1998年第2期97-106,共10页
Acta Acustica
基金
国家自然科学基金
