초록 ▼

The sound attenuating device of the present invention is a bulk layer connected to a support member which forms a plurality of Helmholtz resonators. This invention is particularly useful in a vehicle where the bulk layer attenuates high frequency noise, i.e. above about 1000 Hz, while the resonators

The sound attenuating device of the present invention is a bulk layer connected to a support member which forms a plurality of Helmholtz resonators. This invention is particularly useful in a vehicle where the bulk layer attenuates high frequency noise, i.e. above about 1000 Hz, while the resonators can be tuned across the device to absorb at different lower frequencies in different areas of the device.

대표청구항 ▼

[ What is claimed is:] [1.] An acoustical attenuating device, comprising:a) a bulk layer;b) a backing layer;c) a support member disposed between and attached to said bulk layer and said backing layer, said support member having a plurality of discrete open cavities formed in a surface thereof and ea

[ What is claimed is:] [1.] An acoustical attenuating device, comprising:a) a bulk layer;b) a backing layer;c) a support member disposed between and attached to said bulk layer and said backing layer, said support member having a plurality of discrete open cavities formed in a surface thereof and each cavity having at least one orifice therein; andd) a plurality of resonators for absorbing sound, said resonators defined by said cavities with said orifice, enclosed by said backing layer, each resonator having a geometry which determines a resonant frequency therefor, at least some of said resonator geometries being structured to provide enhanced sound absorption in the range below about 1,000 Hz.