Lightweight acoustical system
AssigneeLear Corporation
InventorsLaura E. Gish, Liangyu Huang, Gordon Ebbitt, Barry Wyerman, David Boyles
Life of this patent
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Abstract
An improved acoustical system for inhibiting noise in a motor vehicle. The system comprises an impermeable layer and an underlayment adjacent to the impermeable layer. The underlayment includes a first fibrous layer and a second fibrous layer. The underlayment has an airflow resistance between about 2000 and about 5000 mks Rayls.
Claims32
An acoustical system comprising:
- a water-impermeable layer;
- an underlayment adjacent to the impermeable layer, the underlayment including a first fibrous layer and a second fibrous layer, the first fibrous layer having a density less than a density of the second fibrous layer;
- the underlayment having a specific airflow resistance between about 2000 and about 5000 mks Rayls;
- and
- a semi-permeable layer disposed between the first and second fibrous layers.
A carpet with noise-inhibiting characteristics for use in a motor vehicle, the carpet comprising:
- a water-impermeable layer;
- and
- an underlayment adjacent to the impermeable layer, the underlayment including a first fibrous layer and a second fibrous layer, the first fibrous layer having a density less than a density of the second fibrous layer;
- the underlayment having a specific airflow resistance between about 2000 and about 5000 mks Rayls;
- wherein the first and second fibrous layers have a surface density between about 500 grams per square meter and about 1400 grams per square meter.
A system for inhibiting noise in a motor vehicle, the system comprising:
- an impermeable layer;
- and
- an underlayment adjacent to the impermeable layer, the underlayment including a first fibrous layer, a second fibrous layer, and a semi-permeable layer, the first layer having a surface density between about 500 grams per square meter and about 1400 grains grams per square meter, and the second layer having a surface density between about 500 grams per square meter and about 1400 grams per square meter;
- the underlayment having a specific airflow resistance between about 2000 and about 5000 mks Rayls.
An acoustical system comprising:
- a water-impermeable layer;
- an underlayment adjacent to the impermeable layer, the underlayment including a first layer and a second layer, the first layer having a density less than a density of the second layer, and a semi-permeable layer disposed between the first and second layers;
- and
- the underlayment having a specific airflow resistance between about 2000 and about 5000 mks Rayls.
A carpet with noise-inhibiting characteristics for use in a motor vehicle, the carpet comprising:
- a water-impermeable layer;
- and
- an underlayment adjacent to the impermeable layer, the underlayment including a first layer and a second layer, the first layer having a density less than a density of the second layer;
- the underlayment having a specific air flow resistance between about 2000 and 5000 mks Rayls;
- wherein the first and second layers have a surface density between about 500 grams per square meter and about 1400 grams per square meter.
A system for inhibiting noise in a motor vehicle, the system comprising:
- an impermeable layer;
- and
- an underlayment adjacent to the impermeable layer, the underlayment including a first layer, a second layer, and a semi-permeable layer, the first layer having a surface density between about 500 grams per square meter and about 1400 grams per square meter, and the second layer having a surface density between about 500 grams per square meter and about 1400 grams per square meter;
- the underlayment having a specific airflow resistance between about 2000 and about 5000 mks Rayls.
Dependencies are inferred from the claim text.