MULTI-LAYER STRUCTURE MATERIAL FOR HULL AND METHOD FOR SIMULTANEOUSLY REDUCING FLUID RESISTANCE AND SELF-RADIATION NOISE LEVEL OF SAILING BODY

摘要

PPROBLEM TO BE SOLVED: To lower radiation noise level of a sailing body to a prescribed value with stability for a long time without degradation during the time passage by cutting off transmission of a wide frequency band mechanical oscillation noise from an oscillation source such as an engine to a hull, and reduce fluid frictional resistance for the sailing body of which the flow-direction cross section simultaneously changes. PSOLUTION: Plate material which is constituted in a sandwich structure by sandwiching elastomer material, CFRP material which is hypobaric elastic material with two layers and a viscoelasticity new material is sandwiched in the hull of the sailing body, or plate material in a multi-layer structure or cylindrical formed material at which a film with a riblet is stuck on a fluid contact surface in the cylindrical shaped material with a groove direction of the riblet and the direction of fluid flow aligned are used to simultaneously reduce fluid resistance for sailing body and the self-radiation noise level. PCOPYRIGHT: (C)2005,JPO&NCIPI