An Experimental Study of the Special Aspects of Scalar-Vector Sound Field Spatial Structures in the Shallow Sea Area

Yury Morgunov,Peter Unru,Aleksandr Golov,Aleksandr Burenin,Lubov Statsenko,Aleksandr Rodionov

doi:10.3390/app8020157

Yury Morgunov, Peter Unru + Show 4 more

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https://doi.org/10.3390/app8020157

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Abstract

This paper discusses the results of an experimental study of the spatial structure of a scalar-vector sound field formed during towing of a low-frequency acoustic source on the continental shelf of the Sea of Japan. Methodologically, the experiment was carried out by towing the acoustic source emitting a 134 Hz tone signal at a depth of 20 m on various acoustic paths at distances of up to 10 km from the combined receiving system, which consisted of a sound pressure receiver and three orthogonal sound pressure gradient components. Particular attention was paid to the investigation of the interference structure of scalar and vector fields in controlled hydrological conditions. The quantitative characteristics and features of the formation of signal interference at several depths along the tracks are discussed. The most interesting are the unique results of comparing horizontal and vertical field components, which make it possible to identify the presence of vortex structures in the acoustic source field on several tracks. The possibility of practical application of current research results is analyzed.

Highlights

With the advent of vector receivers in acoustic measurements, and their active use since the middle of the 20th century, questions have persisted regarding the advisability of their practical application in place of traditional hydrophones to improve the noise immunity of receiving systems [1–5]
The sound fields and the pressure field for several variants of the source maneuvering in the waveguide, sound fields and the pressure field for several variants of the source maneuvering in the waveguide, andtotostudy studythe theinfluence influenceofofthe theminima minimaofofacoustic acousticenergy energyininthe theacoustic acousticfield fieldgenerated generatedby bythe the and source on the noise immunity of the combined reception
The receiving system was installed at given points of the experimental experimental area at specified depths, and a low-frequency tonal acoustic source imitating a discrete area at specified depths, and a low-frequency tonal acoustic source imitating a discrete component in component noise field of awas moving was towed tracks distance from the the noise fieldinofthe a moving source towedsource on various tracks on at avarious distance from at thea receiving system receiving system of up to a maximum of km

Summary

Introduction

With the advent of vector receivers in acoustic measurements, and their active use since the middle of the 20th century, questions have persisted regarding the advisability of their practical application in place of traditional hydrophones to improve the noise immunity of receiving systems [1–5] This is mostly due to a lack of experimental research in this field, as well as problems of theoretical modeling of the formation of vector-scalar fields under complex hydrological and bathymetric conditions, especially in the shallow sea. One effective solution to the problems of using vector receivers is to set up model experiments in specified water areas, featuring a real scenario using combined signal reception from a moving underwater sound source and the subsequent analysis of the effectiveness of this scenario This approach was used in our experiments, the results of which are presented below

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