Title :
Application of the finite difference time domain method to the time reversal wave in shallow water
Author :
Saito, Hideaki ; Naoi, Jun ; Tsuchiya, Toshio ; Kikuchi, Toshiaki
Author_Institution :
Japan Agency for Marine-Earth Sci. & Technol., Yokohama
Abstract :
A propagation path of sound wave in shallow water may contain some obstacles, such as sunken ship and structure. In order to analyze the waves reflected from the object in the sound field, we have to analyze the reflected pulse wave in time domain. The solution of the time dependent wave equation can be obtained via a Fourier transform of the frequency domain solution. However, it is difficult to obtain a solution in frequency domain for the sound field including complicated objects. We analyze the reflected and diffracted wave from an object using the FDTD method directly analyzing in time domain. Furthermore, time reversal processing to the reflected and diffracted wave is carried out, and time reversed wave is reradiated from the time reversal array (TRA). And the convergence characteristic of the wave carried out time reversal is investigated
Keywords :
Fourier transforms; acoustic field; acoustic wave diffraction; acoustic wave reflection; finite difference time-domain analysis; underwater acoustic propagation; Fourier transform; diffracted wave; finite difference time domain method; frequency domain; propagation path; reflected pulse wave; reflected wave; shallow water; sound field; sound wave; sunken ship; sunken structure; time dependent wave equation; time reversal array; time reversal processing; time reversal wave; Acoustic diffraction; Acoustic propagation; Finite difference methods; Fourier transforms; Frequency domain analysis; Marine technology; Marine vehicles; Partial differential equations; Steady-state; Time domain analysis;
Conference_Titel :
OCEANS '04. MTTS/IEEE TECHNO-OCEAN '04
Conference_Location :
Kobe
Print_ISBN :
0-7803-8669-8
DOI :
10.1109/OCEANS.2004.1406497
