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Sound wave scattering from an air filled shell in a layer of liquid

Sound wave scattering from an air filled shell in a layer of liquid

Alex Zinoviev (1997)

ICSV5: Proceedings of the 5th International Congress of Sound and Vibration, Adelaide, South Australia, Australia, 15-18 December

Abstract:

A new numerical modelling method for sound wave scattering by elastic objects in an acoustic waveguide is proposed. The method is applied to the case of sound propagation and scattering in a plane 2-dimensional layer of liquid 80 metres deep containing a cylindrical air filled shell of finite wall thickness and an outer shell radius of 8 metres. The incident wave is considered to be the lowest order propagating mode of the waveguide. The reflection coefficient is calculated in the frequency range between 5 and 300 Hz for several values of wall thickness and distance between the shell and the waveguide bottom. Pictorial output shows that the amount of acoustic energy reflected strongly depends upon all variables. Maxima and minima in the reflection coefficient associated with cut-on frequencies of the waveguide modes and structural resonances of the shell are identified. The calculations show that the conventional definition of the target strength is inappropriate.

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