Perforated hard trim for sound absorption
AssigneeLear Corporation
InventorTerence Connelly
Life of this patent
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Abstract
A perforated hard trim construction for incorporation into a an automobile interior with sound absorbing properties is provided. In one variation, the perforated hard trim construction includes a non-perforated metal component and a perforated hard trim component having a plurality of openings and connected to the non-perforated metal component. The plurality of openings have a sufficient total area such that the random incidence absorption coefficient is greater than about 0.1 for one-third octave center frequencies from about 1000 to about 10000 Hz. In an important variation, an porous sound absorbing material is interposed between the non-perforated hard trim component and the perforated hard trim component.
Claims20
A perforated hard trim construction for absorbing sound in an automobile interior, the perforated hard trim construction comprising:
- a non-perforated metal component;
- a perforated hard trim component having a plurality of openings and connected to the non-perforated metal component, wherein the plurality of openings have a sufficient total area such that the random incidence absorption coefficient is greater than about 0.1 for one-third octave center frequencies from about 1000 to about 10000 Hz;
- a exterior absorbing material disposed over the perforated hard trim component;
- and
- a fabric layer covering the first absorbing layer.
A automobile interior perforated hard trim construction comprising:
- a non-perforated metal component;
- a perforated hard trim component having a plurality of openings and connected to the non-perforated metal component, the plurality of openings having a total surface area less than about 12% of a surface area of the non-perforated metal component wherein the average area of an opening in the plurality of openings is less than about 30 mm2;
- and
- a porous material interposed between the non-perforated metal component and the perforated hard trim component;
- wherein the interior perforated hard trim construction has a random incidence absorption coefficient is greater than about 0.2 for one-third octave center frequencies from about 1000 to about 10000 Hz.
A automobile interior perforated hard trim construction comprising:
- a non-perforated metal component;
- a perforated hard trim component having a plurality of openings and connected to the non-perforated metal component, the plurality of openings having a total surface area less than about 12% of a surface area of the non-perforated metal component wherein the average area of an opening in the plurality of openings is less than about 30 mm2;
- an interior porous material interposed between the non-perforated metal component and the perforated hard trim component;
- an exterior absorbing material disposed over the perforated hard trim component;
- and
- a fabric layer covering the first absorbing layer, wherein the interior perforated hard trim construction has a random incidence absorption coefficient is greater than about 0.2 for one-third octave center frequencies from about 1000 to about 10000 Hz.
Dependencies are inferred from the claim text.