MARINE VESSEL NOISE ATTENUATING STRUCTURE

摘要

The exhaust or the inlet duct of a marine gas turbine engine power plant installation comprises a porous duct, a plurality of circumferentially arranged non-porous channel members attached to and axially spaced along the porous duct, the channel members and the porous duct together defining a plurality of annular noise attenuating cells, and at least one layer of heat insulating material surrounding the channel members, the insulating material being contained with a cover and attached to the porous duct.