METHOD FOR DETERMINING THE COORDINATES, RADIATION PATTERNS AND ACOUSTIC POWER OF RADIATION ZONES ON THE BODY OF A MOVING NOISY OBJECT Russian patent published in 2023 - IPC G01H3/00 

FIELD: hydroacoustics.

SUBSTANCE: invention can be used to study the fine structure of the primary hydroacoustic fields of moving surface and underwater marine noisy objects (MO). The method consists in locating a hydroacoustic receiving module with a combined hydroacoustic receiver in a given area of a natural water body, directing the studied noisy object to the receiving module and measuring the acoustic radiation power of the noisy object calculated on the computer in the measurement plane, oriented along the trajectory of the object according to the reference hydroacoustic signal, emitted by a noisy object. In this case, the emitter of the reference hydroacoustic signal is placed with known coordinates on the body of the noisy object, and in the frequency ranges of the noise emission of the object and the reference emitter selected for analysis, the flow characteristics of the projections of the acoustic power fluxes of the radiation of their zones on the coordinate axes of the measurement plane are measured. According to the flow characteristics of the projections of the flow vectors on an axis oriented parallel to the movement trajectory, the time moments of resetting their values are determined, then the coordinates of the acoustic centres of the radiation zones on the body of the noisy object of the selected frequency ranges are determined by the formula X_i=Х_re+V(T_i-Т_re), where X_re is the coordinate on the body of the noisy object of the emitter of the reference hydroacoustic signal, V is the speed of the noisy object, T_i is the time moments of zeroing the projections of the acoustic power flux vectors of the noisy object radiation in the selected frequency ranges on axis X, oriented parallel to the movement trajectory, T_re is the time moment of zeroing the projection of the flux vector from the reference emitter; using the results of measurements of the passage characteristics of the total acoustic power of the radiation zones, the radiation patterns are calculated and the acoustic power of the radiation zones of a moving noisy measurement object is determined in the selected frequency ranges.

EFFECT: increased accuracy of determination of the coordinates of emission zones of sources of a noisy object on the MO body, their frequency ranges, acoustic radiation power and contributions to the primary acoustic field of the measurement object in running modes.

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