Hyrdoacoustic Ocean Exploration

Theories and Experimental Application

Inbunden, Engelska, 2016

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The only book that offers a comprehensive and fully up-to-date coverage of hydroacoustic ocean exploration, this work deals with the diagnostics of non-uniformities in a water medium using the hydroacoustic parametric antenna. The non-uniformities of the water medium in the study are of geometrically regular shape, i.e., the shape of a sphere, a cylinder, and a spheroid. An account is given of theoretical and experimental studies of wave processes that occur in the event of the scattering of non-linearly interacting acoustic waves at a sphere, a cylinder, and a spheroid. Scattering problems are formulated; solutions to the inhomogeneous wave equation are found in the first and second approximations using the successive approximations method.For the first time, high-frequency asymptotic expressions of acoustic pressure for all spectral components of the secondary field are obtained for the nonlinear scattering problem. The scattering diagrams are calculated and plotted, and then analyzed and compared. Results of experimental studies of the parametric acoustic antenna field scattering at solidsteel spheres are presented. Experimental scattering diagrams both for the parametric antenna pump waves and for the secondary field waves including the difference frequency wave, the sum frequency wave, and the second harmonic wave are presented. 3D modeling of wave processes is also considered.A must have for researchers and specialists in nonlinear hydroacoustics and ocean acoustics; it also may be of use for postgraduates and students specializing in hydroacoustics and ocean exploration.

Produktinformation

Utgivningsdatum2016-11-11
Mått158 x 231 x 18 mm
Vikt363 g
FormatInbunden
SpråkEngelska
Antal sidor192
FörlagJohn Wiley & Sons Inc
ISBN9781119323549

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Introduction 11 Scattering of Nonlinear Interacting Plane Acoustic Waves by a Sphere 71.1 Review of Studies Dealing with the Scattering of Plane Acoustic Waves by a Sphere 71.2 Problem Statement 101.3 Solving via the Inhomogeneous Equation with the Successive Approximations Method 131.4 Investigation of Acoustic Field of Difference Frequency 161.5 Investigation of Acoustical Field of the Sum Frequency Wave 341.6 Investigation of Acoustical Field of the Second Harmonics 361.7 Experimental Investigation Scattering of the Field of Acoustic Parametric Antenna by a Hard Sphere 481.7.1 Experimental Setup and Metrological Support for the Experiment 481.7.2 Results of the Experiments 521.7.3 Analysis of Combined Scattering Diagrams of the Nonlinear Interacting Plane Acoustic Waves by a Hard Sphere 611.8 A Comparative Analysis of Assumption and Experimental Scattering Diagrams for Secondary Field Waves 651.9 Conclusion 682 Scattering of Nonlinear Interacting Plane Acoustic Waves by a Cylinder 712.1 Review of Plane Acoustic Waves Scattering by a Cylinder 712.2 Statement of Problem 752.3 Investigation of Acoustic Field of Difference Frequency 792.4 Investigation of Acoustic Field of Sum Frequency 932.5 Investigation of Acoustic Field of the Second Harmonic 962.6 Discussion and Comparison of Results 1082.7 Conclusion 1133 Research of the Scattering of Nonlinear Interacting Plane Acoustic Waves by an Elongated Spheroid 1153.1 Review of Plane Acoustic Waves Scattering by an Elongated Spheroid 1153.2 Wave problems in Elongated Spheroidal Coordinates 1183.3 Statement of Problem 1203.4 Investigation of the Acoustic Field of Difference Frequency Wave 1243.5 Investigation of the Acoustic Field of Sum Frequency 1423.6 Investigation of the Acoustic Field of Second Harmonics 1483.7 Discussion and Comparison of Results 1603.8 Conclusion 164References 165Index 173