Study of energy distribution of guided waves in multilayered media

CORC > 武汉物理与数学研究所 > 中国科学院武汉物理与数学研究所 > 2011年以前论文发表（包括2011年）

	Study of energy distribution of guided waves in multilayered media
	Zhang, BX ; Xiong, W ; Yu, M ; Lan, CQ ; Li, L
刊名	JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
	1998
卷号	103 期号:1 页码:125-135
英文摘要	The energy distributions of guided waves in multilayered elastic solid media are investigated in three dimensions. A guided wave is the result of the interaction of the acoustic source and the interfaces in the material structure, and does not lose energy in the course of propagation along the horizontal direction. It should be pointed out that the guided wave cannot be excited alone by a practical acoustic source in this paper. The mean energy flux density of the guided waves (excited by a nonaxisymmetric acoustic source) has the tangential component except the radial component, but the effective part of the mean energy flux density has only the radial component. Only in the case that the propagation distance is greater than the wavelength, is the propagation velocity of the mean value of the total energy equal to the group velocity of the guided wave. It is found that the propagation velocity of the mean energy density is equal to the phase velocity of the guided wave in the lowest layer medium in the multilayered media, but in other layers, the propagation velocity of the mean energy density is related to the distance from the free surface to the receiving point. Two categories of guided waves, Rayleigh and trapped waves, are also numerically investigated in this paper in the multilayered media in which a low-velocity area is comprised. It is also found that one category of the guided waves decays rapidly with the distance from the free surface while the another category of guided waves concentrates its energy within the low-velocity area and decays with the distance from the low-velocity area. These two categories of guided waves have different energy distributions and propagation characteristics. However, since they are closely related, it is not always easy to distinguish them from each other. The excitation and propagation mechanism of the guided waves are useful for exploring the structures of the interfaces and the low-velocity area under the free surface. (C) 1998 Acoustical Society of America.
WOS标题词	Science & Technology ; Technology ; Life Sciences & Biomedicine
类目[WOS]	Acoustics ; Audiology & Speech-Language Pathology
研究领域[WOS]	Acoustics ; Audiology & Speech-Language Pathology
关键词[WOS]	FILLED POROUS-MEDIA ; RAYLEIGH-WAVES ; SURFACE-WAVES ; ELASTIC-WAVE ; HALF-SPACE ; DISPERSION ; ATTENUATION ; INTERFACE
收录类别	SCI
语种	英语
WOS记录号	WOS:000071496900011
公开日期	2015-12-01
内容类型	期刊论文
源URL	[http://ir.wipm.ac.cn/handle/112942/8313]
专题	武汉物理与数学研究所_2011年以前论文发表（包括2011年）
作者单位	1.Cent S Univ Technol, Inst appl Geophys, Changsha 410083, Peoples R China 2.Chinese Acad Sci, Wuhan Inst Phys, Wuhan 430071, Peoples R China
推荐引用方式 GB/T 7714	Zhang, BX,Xiong, W,Yu, M,et al. Study of energy distribution of guided waves in multilayered media[J]. JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA,1998,103(1):125-135.
APA	Zhang, BX,Xiong, W,Yu, M,Lan, CQ,&Li, L.(1998).Study of energy distribution of guided waves in multilayered media.JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA,103(1),125-135.
MLA	Zhang, BX,et al."Study of energy distribution of guided waves in multilayered media".JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA 103.1(1998):125-135.