کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
755520 895962 2007 21 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Rapid computation of acoustic impulse scattering for rough penetrable surfaces
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی مکانیک
پیش نمایش صفحه اول مقاله
Rapid computation of acoustic impulse scattering for rough penetrable surfaces
چکیده انگلیسی
Chu's theory for the impulse response of a point source to an isovelocity density contrast wedge [Chu D. Impulse response of density contrast wedge using normal coordinates. J Acoust Soc Am 1989;86:1883-96] enables wedge-assemblage rough surface scattering models to be extended to a broad range of penetrable seafloors, but is computationally intensive since it necessitates finding the multifold roots of a characteristic eigenvalue equation, and summing a power series, for each wedge apex. This present work considers the properties and relationships of the direct, reflected, and diffracted field components of a density contrast wedge. In particular, an analysis of the physical origin and behavior of diffractions associated with specular reflections of the source in the wedge faces leads to a simple extension of the Biot-Tolstoy theory [Biot MA, Tolstoy I. Formulation of wave propagation in infinite media by normal coordinates with an application to diffraction. J Acoust Soc Am 1957;29:381-91] to density contrast wedges with reflectivity ∣R∣ < 1, for wedge angles within the range 150 ≲ θw ≲ 210°, where the diffractions are predominantly associated with a single reflection in each wedge face. This facilitates rapid time domain calculations of acoustic bottom scattering and penetration for complex multilayered seafloors.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Acoustics - Volume 68, Issue 4, April 2007, Pages 437-457
نویسندگان
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