Sound damping arrangement
AssigneeKvaerner Masa-Yards Oy
InventorsPekka Salmi, Jonas Packalen, Antti Jarvi
Life of this patent
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Abstract
Underwater sound from a marine vessel driven by one or more propellers is damped by introducing air and/or other gas into the vessel's propeller flow(s) so that the turbulence of the propeller flow(s) causes mixing of the air/gas and water and disintegration of gas bubbles. The majority of the gas bubbles formed in the water are from 1 to 20 mm in diameter.
Claims24
A method of damping underwater sound emitted by a marine vessel driven by a propeller means that creates at least one turbulent propeller flow in the water, said method comprising introducing gas into the propeller flow in close proximity to the propeller means so that the turbulence of the propeller flow causes a strong mixing of gas and water and formation of gas bubbles in the water behind the vessel as the vessel moves forward and the majority of gas bubbles behind the vessel have a diameter of from 1 to 20 mm.
A method of operating a marine vessel equipped with a propeller means, said method comprising driving the propeller means so that it creates at least one turbulent propeller flow in the water for propelling the vessel in a forward direction, and introducing gas into the propeller flow in close proximity to the propeller means so that the turbulence of the propeller flow causes a strong mixing of gas and water and formation of gas bubbles in the water behind the vessel as the vessel moves in the forward direction and the majority of gas bubbles formed behind the vessel have a diameter of from 1 to 20 mm.
A marine vessel having a propeller means, a drive means for driving the propeller means to create at least one turbulent propeller flow in the water for propelling the vessel in a forward direction, and a gas feed means for introducing gas into the propeller flow in close proximity to the propeller means so that the turbulence of the propeller flow causes a strong mixing of gas and water and formation of gas bubbles in the water behind the vessel as the vessel moves in the forward direction and the majority of gas bubbles formed behind the vessel have a diameter of from 1 to 20 mm.
Dependencies are inferred from the claim text.