METHOD OF REDUCING UNDERWATER NOISE OF SHIPS AND APPARATUS FOR REALISING SAID METHOD Russian patent published in 2012 - IPC G10K11/172 A01K79/00 

FIELD: physics.

SUBSTANCE: apparatus consists of a compressed air source, a main air-duct and an air-duct with holes. The holes in the air-duct are made based on biological features of the object under analysis or field with stepping increment of the diametre from a minimum value of the dimension interval to a maximum value, wherein the holes with stepping increment of the diametre lie uniformly on the circle of the air-duct, and holes with the same diametre lie equidistant on the length of the air-duct which is then put into the underwater part of the housing on both flanks along the main and on-board back of the ship, as well as in the region of ship engines, field mechanisms and the propeller, wherein air-ducts are further fitted with air solenoid valves for separately feeding air at different fishing stages.

EFFECT: reduced nose generated by scientific research and fishing vessels, and can be used in the fishing industry to reduce the deterrent effect of underground noise of ships on the behaviour of an object under analysis or a field, thus increasing reliability of estimating bioresources and fishing efficiency.

2 cl, 6 dwg, 3 tbl