SANDWICH STRUCTURE MEMBER, SHIELDING PERFORMANCE, SANDWICH PANEL AND SANDWICH STRUCTURE HAVING EXCELLENT SOUND INSULATION PERFORMANCE AND ELECTROMAGNETIC

摘要

PURPOSE: To improve noise insulation effect and to shield from electromagnetic wave by restraining coincidence effect, resonance of hard boards and transmission of solid noise by applying ferromagnetic alloy as a hard board of a sandwich structure member. ;CONSTITUTION: In a sandwich structure member which is comprised of a pair of hard plane boards 2, 3 whose surfaces are made parallel each other and a core material 1 by an elastic material, a viscoelastic material or a porous material inserted to an air layer 4 in an intermediate thereof, at least one of a pair of hard boards 2, 3 is formed of ferromagnetic alloy.;COPYRIGHT: (C)1995,JPO