Perforated soundproof structure and method of manufacturing the same
aaA perforated soundproof structure is formed by oppositely arranging an external plate and an internal plate having a number of through-holes . The board thickness, hole diameter and open area ratio of the internal plate are set to satisfy design conditions to give rise to a viscous effect in the a...
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| Format: | Patent |
| Sprache: | eng |
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| Zusammenfassung: | aaA perforated soundproof structure is formed by oppositely arranging an external plate and an internal plate having a number of through-holes . The board thickness, hole diameter and open area ratio of the internal plate are set to satisfy design conditions to give rise to a viscous effect in the air passing through the through-holes , and the design conditions are set so that the frequency bandwidth to attain an absorption coefficient of 0.3 or more is 10% or more of the resonance frequency. |
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