DEVICE FOR DAMPING AND SCATTERING HYDROSOUND IN A LIQUID

摘要

A device is provided for damping hydrosound in liquid emitted from a sound-emitting body in the liquid. The device includes a plurality of envelope bodies distributed in the liquid in an area of the hydrosound-emitting body and at a distance from each other. A material, diameter and pressure of each envelope body is configured such that a natural frequency of the envelope body corresponds to an emitted frequency range of the hydrosound so as to dampen the hydrosound. The device also includes at least one mass body disposed in the liquid. The envelope bodies are connected to the mass bodies so as to prevent the envelope bodies from rising up in the liquid.

主权项

1: An apparatus that reduces the decibel level of underwater sounds emanating from an underwater device comprising:
a support positionable proximate to the underwater device, wherein the support comprises a plurality of rigid support members; and a plurality of gas-filled containers coupled to the support, wherein each of the plurality of gas-filled containers comprises a flexible membrane filled with a gas, and wherein the plurality of gas-filled containers are connected to the plurality of rigid support members such that at least some of the plurality of gas-filled containers are in contact with one or more of the plurality of rigid support members, and wherein when deployed proximate to the underwater device, the rigid support members prevent vertical movement of the plurality of gas-filled containers; wherein the gas-filled containers include gas-filled bodies each of which has a physical characteristic that confers a selected resonance frequency to each of the gas-filled bodies upon immersion into the water surrounding the underwater device; and wherein the gas-filled containers create a void fraction for the device such that a preselected noise reduction is achieved.