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Sound-absorbing structure and sound-absorbing unit

a technology of sound absorption structure and sound absorption unit, which is applied in the direction of walls, instruments, transportation and packaging, etc., can solve the problems of large energy loss of sound waves coming from the side of the support base, and the inability of the vibration of the support base to be transmitted directly to the corrugated partition plate, etc., to achieve efficient sound absorption, high sound absorption capability, and high sound absorption capacity

Inactive Publication Date: 2005-12-01
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0006] It is a general object of the present invention to provide sound-absorbing structure and sound-absorbing unit that have a high sound-absorbing capability as well as a high sound-insulating capability and that can provide an efficient sound-absorbing effect centered on a particular target frequency.

Problems solved by technology

Thus, the sound waves coming from the support base's side lose a large amount of energy thereof when they pass through the corrugated partition plate.
Further, there is a gap (separation) between the lower antinode portions of the corrugated partition plate and the support base.
Thus, the vibration of the support base cannot be transmitted to the corrugated partition plate directly.

Method used

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Examples

Experimental program
Comparison scheme
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first embodiment

[0049]FIG. 3A is a cross-sectional view of a sound-absorbing unit according to the present invention. FIG. 3B is a perspective view of the partition plate of the sound-absorbing unit of this embodiment. The sound-absorbing unit 50 consists of a sound-absorbing material 51 and a partition plate 52.

[0050] The partition plate 52 according to the first embodiment has a wave-shaped cross-section with the upper and lower antinode portions 52a, 52b, respectively, extending substantially in parallel with each other in a constant direction. Although the corrugated partition plate 52 is made of stamped aluminum plate in terms of weight reduction, it can be made of hard resin such as polypropylene-based resin or steel, etc.

[0051] The pitch W1 between the neighboring upper antinode portions 52a may be determined, based on the above-mentioned principle, considering the target frequency band and the characteristics of the sound field around the sound-absorbing unit 50. It is noted that each of t...

second embodiment

[0073]FIG. 6A is a cross-sectional view of a sound-absorbing unit according to the present invention. FIG. 6B is a perspective view of the partition plates of the sound-absorbing unit of this embodiment. The sound-absorbing unit 60 consists of a sound-absorbing material 51, a partition plate 52 and second partition plates 53. The sound-absorbing material 51 and the partition plate 52 can be configured as the aforementioned embodiments (including alternative embodiments). The like components indicated by like references are the same as the aforementioned ones, unless otherwise specified.

[0074] The second partition plates 53 are substantially rectangular flat plate. The second partition plates 53 may be made of an aluminum or steel plate, as is the partition plate 52. According to this embodiment, the second partition plates 53 are placed in the direction X that is substantially perpendicular to the direction Y in which the antinode portions 52a, 52b of the corrugated partition plate ...

third embodiment

[0088]FIG. 11A is a cross-sectional view of a sound-absorbing unit according to the present invention. FIG. 11B is a perspective view of the partition plate of the sound-absorbing unit of this embodiment. The sound-absorbing unit 70 consists of a sound-absorbing material 51 and a partition plate 54. The sound-absorbing material 51 can be configured as in the aforementioned embodiments.

[0089] The sound-absorbing unit 70 of this embodiment may be configured and placed as in the aforementioned embodiments (see FIGS. 4A-4C and FIG. 7). For example, the sound-absorbing unit 70 may be mounted on the support base 80 via the elastic element 90, as shown in FIG. 11A. It is noted that elastic element 90 can be a low-destiny sheet material because the partition plate 54 is equipped with the sound-insulating capability for noise coming from behind, as the corrugated partition plate 52 mentioned above.

[0090] According to this embodiment, the partition plate 54 is made of aluminum plate, etc. wh...

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Abstract

Sound-absorbing unit is provided with a high sound-absorbing / insulating capability. The sound-absorbing unit (60) includes a corrugated partition plate (52) whose antinode portions (52a, 52b) extend in a first direction (Y); a sound-absorbing material (51) provided on the corrugated partition plate (52); and a second partition plate (53) which extends in a second direction (X) and which partitions air portions (70) defined between the corrugated partition plate (52) and the sound-absorbing material (51).

Description

TECHNICAL FIELD [0001] The present invention relates to sound-absorbing structure and sound-absorbing unit that absorb a grating noise. More specifically, the present invention relates to sound-absorbing structure and sound-absorbing unit with partition plates that divide the air layer behind a sound-absorbing material. BACKGROUND ART [0002] Sound-absorbing unit with partition plates, which divide the air layer between a sound-absorbing material and a base plate into a plurality of lattice ‘cells’, is known, as disclosed in JP,11-161282,A. In this sound-absorbing unit, the height of the air layer in the sound wave incident direction is set to one-fourth of the wavelength of a target sound. This enables the energy of the sound wave to be absorbed efficiently. Thus, according to the conventional sound-absorbing unit, a sound absorbing coefficient for a particular frequency component is improved, and it becomes possible to reduce the weight of the sound-absorbing unit while maintaining...

Claims

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Application Information

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IPC IPC(8): E04B1/74E04B1/84B60R13/08E04B1/86E04C2/34G10K11/16G10K11/168G10K11/172
CPCE04B1/86E04B2001/747E04B2001/8471E04B2001/8476E04C2/3405G10K11/172E04C2002/3427E04C2002/3466G10K11/16G10K11/168E04C2002/3422
Inventor NISHIMURA, YASUHIKO
Owner TOYOTA JIDOSHA KK
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