Sound-absorbing article effective over a broad frequency range
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United States of America Patent
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Nov 23, 2004
Grant Date -
N/A
app pub date -
Feb 11, 2002
filing date -
Aug 11, 1999
priority date (Note) -
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Abstract
A sound-absorbing article which is one of a lining or a shaped element and which has a sound absorptive effect over a broad frequency range particularly useful in transportation vehicle when positioned proximate a reverberant wall, the article including at least one microperforated sheet absorber which has microperforations defined therein having at least one hole diameter ranging from 0.05 mm to 2 mm, which has at least one interhole distance ranging from 1 mm to 20 mm, and which has a proportion of hole area ranging from 0.2 to 4%, based on surface area of the at least one microperforated sheet absorber; and at least one absorber which is at least one of a foam absorber and a non-woven absorber and which is positioned at a preselected spatial distance from a reverberant wall.
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