RAILROAD VEHICLE HAVING SOUND INSULATION MEMBER, SOUND INSULATION MEMBER AND MANUFACTURING METHOD OF SOUND INSULATION MEMBER

摘要

PROBLEM TO BE SOLVED: To provide a vehicle having good ride comfort without thickening a sound insulation member and provide the sound insulation member for improving sound insulation characteristics. SOLUTION: A flat shaped sound-absorbing member 2 comprising a foaming porous material or a fiber material and having a structure which enables internal spaces to communicate with each other is arranged in a bag shape formed of a film 1 coated with a resin, and sealing gas 3 having acoustic impedance different from that of air is sealed. COPYRIGHT: (C)2006,JPO&NCIPI