Composite sound absorbing structure disposed in the housing structure and the storage structure of the composite sound absorbing structure

摘要

PPROBLEM TO BE SOLVED: To provide a compound sound absorbing structure improving sound absorbing performance by compounding a surface layer and a main material layer, and by combining them with nonwoven fabric in which a porous sound absorbing material is used as a base, and also to provide a storage structure using the same. PSOLUTION: The compound sound absorbing structure 10 is constituted by combining a base structure 1 obtained by compounding the surface layer 3 in which two nonwoven fabrics A and B being cloth materials such as span bond are used and the main material 2 which is composed of a polyester fabric or is mainly composed of the polyester fabric, with the nonwoven fabric 4 on which fire proofing/water proofing treatment is applied, a mesh structure 5 of a metallic system such as a metal mesh, and a punching metal 6 as a protective cover. By controlling flow resistance on the surface layer 3, it is effective for sound absorbing performance to adjust the flow resistance of the base structure 1 to be (2.0 to 5)×10SP4/SP(N sec)/mSP4/SP, and it is lightweight with a thickness of 40 to 50 mm, and it is also used as an all-weather type. The stable sound absorbing performance is provided from a low/middle frequency band to a high frequency band, especially around 400 Hz. PCOPYRIGHT: (C)2010,JPO&INPIT