Mass-spring system for sound protection purposes

摘要

A mass-spring system for sound protection purposes, in particular in motor vehicles, consists of a flexible heavy layer of plastic as the mass and a soft layer as the spring, which serves for resting on the sound-reflecting surface or wall, and which is a gel of 10 to 50% by weight of an organic polymer or silicon polymer and 50 to 90% by weight of a plasticiser, which is compatible with the latter in each case, which gel has a modulus of elasticity E' /= 5 x 105 Pa and an inner dissipation factor d /= 0.5 at room temperature. …IMAGE…