Diffraction of sound pulses on a spherical target in an oceanic waveguide covered with ice

• Autorzy: Grigorieva N. , Kupriyanov M. , Ostrovskiy D. , Stepanova D.
• Języki publikacji: EN

Abstrakty

EN

This paper is devoted to modeling of the pulse scattering by a spherical target immersed in a homogeneous waveguide covered with ice. For calculating the echo signal in the frequency domain we have followed Hackman and Sammelmann’s general approach. The arising scattering coefficients of a sphere were evaluated with the use of the normal mode method. The amount of normal modes forming the backscattered field is determined by the given directivity of the source. The emitted signal is a pulse with a Gaussian envelope. Computational results are obtained in a wide frequency range 8 - 12 kHz for water depths equal to several hundreds of m, and distances between the source/receiver and a target from 1 km up to 10 km. The target is assumed to be acoustically rigid or fluid. In particular, the properties of the ice cover and a scatterer may coincide.

Słowa kluczowe

EN

diffraction of acoustic waves; ice-covered homogeneous waveguide; normal modes of the waveguide; pulse width a Gaussian envelope; surface waves; Franz type; Whispering Gallery type

• Wydawca: Polskie Towarzystwo Akustyczne. Oddział Gdański
• Czasopismo: Hydroacoustics
• Rocznik: 2016
• Tom: Vol. 19
• Strony: 139--144
• Opis fizyczny: Bibliogr. 4 poz., rys.

Twórcy

autor

Grigorieva N.

• St. Petersburg State Electrotechnical University (SPbETU), 5 Prof. Popova Str., 197376 St.Petersburg, Russia
• St. Petersburg State Marine Technical University, 3 Lotsmanskaya Str., 190008 St.Petersburg, Russia

autor

Kupriyanov M.

• St. Petersburg State Electrotechnical University (SPbETU), 5 Prof. Popova Str., 197376 St.Petersburg, Russia

autor

Ostrovskiy D.

• St. Petersburg State Electrotechnical University (SPbETU), 5 Prof. Popova Str., 197376 St.Petersburg, Russia
• JSC “Concern “Oceanpribor”, 46 Chkalovskiy pr., 197376 St. Petersburg, Russia 1

autor

Stepanova D.

• JSC “Concern “Oceanpribor”, 46 Chkalovskiy pr., 197376 St. Petersburg, Russia 1

Bibliografia

• [1] R.H. Hackman and G.S. Sammelmann, Multiple – scattering analysis for a target in an oceanic waveguide, J. Acoust. Soc. Am., Vol. 84, 1813 – 1825, 1988.
• [2] N.S. Grigorieva, D.A. Mikhaylova and D.B. Ostrovskiy, Echo – signal from a scatterer in an ice covered homogeneous waveguide, Acoust. Phys., Vol. 61, 127 – 135, 2015.
• [3] S.G. Kargl and P.L. Marston, Ray synthesis of Lamb wave contributions to the total scattering cross section for an elastic spherical shell, J. Acoust. Soc. Am., Vol. 88, 1103 – 1113, 1990.
• [4] G. Gaunaurd, Elastic and acoustic resonance wave scattering, Appl. Mech. Rev., Vol. 42, 143 – 192, 1989.

Uwagi

PL

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę (zadania 2017)