Porous sound absorbing structure

a sound absorbing structure and porous technology, applied in the field of porous sound absorbing structure, can solve the problems of clogging through the hole, affecting exerting the sound absorption effect, so as to achieve sufficient sound absorption performance and promote the conversion of air vibration
US20100175949A1Inactive Publication Date: 2010-07-15KOBE STEEL LTD
15 Cites 26 Cited by

Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
KOBE STEEL LTD
Publication Date
2010-07-15
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

A porous sound absorbing structure 10 includes an exterior plate 1 and a closing plate 2 in order to suppress a decrease in sound absorbing performance in a wide frequency band. An interior plate 3 is arranged between the exterior plate 1 and the closing plate 2, and air layers 4 and 5 are located between the exterior plate 1 and the interior plate 3 and between the interior plate 3 and the closing plate 2 respectively. The exterior plate 1, the interior plate 3, and the closing plate 2 are arranged while opposed to each other. Many through holes 1a and 3a are made in the exterior plate 1 and the closing plate 2 respectively. In the interior plate 3, a plate thickness t2 and a diameter φ2 and an aperture ratio β2 are set so as to generate an viscous effect in air passing through the through hole 3a. The aperture ratio β1 of the through hole 1a in the exterior plate 1 is set more than 3% and not more than 50%.
Need to check novelty before this filing date? Find Prior Art

Description

CROSS-REFERENCES TO RELATED APPLICATIONS

[0001] This application is a Divisional application of U.S. application Ser. No. 11 / 578,666 filed Oct. 17, 2006, which is a national stage application of PCT / JP05 / 7322 filed Apr. 15, 2005. Priority is claimed based on U.S. application Ser. No. 11 / 578,666 filed Oct. 17, 2006, which claims priority to PCT / JP05 / 7322 filed Apr. 15, 2005, which claims priority to Japanese Patent Application No. 2004-135145 filed on Apr. 30, 2004, all of which is incorporated herein by reference.TECHNICAL FIELD

[0002] The present invention relates to a porous sound absorbing structure which reduces sound from a noise emitting source.BACKGROUND ART

[0003] Recently, a porous soundproof structure is becoming operational in various fields. In the porous soundproof structure, a plate member in which a hole is not made and a plate member in which many through holes are made over a surface are arranged on an outside and an inside with respect to a sound source while opposed to ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More