返回Google圖書搜尋

Experiment and Numerical Evaluation of Acoustic Scattering at a Rough Surface

出版	University of Wisconsin, Department of Geology and Geophysics, Geophysical and Polar Research Center, 1973
URL	http://books.google.com.hk/books?id=qCija-kb-1YC&hl=&source=gbs_api

註釋The Helmholtz integral is often used as the basis for theories on scattering of acoustic signals from rough surfaces, but several approximations must be made to obtain analytical solutions. Many of the mathematical difficulties in analytical computations can be avoided by numerically evaluating the Helmholtz integral. A numerical technique is described which uses measured values of the acoustic pressure of the incident beam, including the side lobes, thereby removing the uncertainty which normally results from approximating the form of the incident beam. A comparison of numerical, analytical, and experimental results is made for the case of a vertically incident beam and a moderately rough surface. The numerical computations are shown to yield values of the scattered pressure which agree well with experimental data for both rough and smooth surfaces. (Modified author abstract).