Sound insulating element for car inside - has heavy layer of foam material, contg. foil-enclosed cavities

摘要

The sound insulation element is intended for a surface with known distribution of sound source and decay areas, partic. for the car interior. It consists of a resilient mass (4), forming a resonator system, contg. suppressing portions to convert sound sources into decay areas. The suppression portions consist of cavities (1), which are embedded in the resilient foam material (3), or fibre web material with equivalent acoustic characteristics. They are each enclosed in foil (2) and reach down to a heavy layer (4), or a car bottom sheet metal plate (8).