Sound absorbing structure and vehicle component having sound absorbing properties

A technology for sound-absorbing and vibrating components, which is applied to vehicle components, sound-generating devices, transportation and packaging, and can solve problems such as the impossibility of achieving high sound absorption rates

Inactive Publication Date: 2009-08-05
YAMAHA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The relationship between the resonant frequency of the spring-mass system and the resonant frequency of the flexural system resulting from elastic vibrations caused by the elasticity of the plate has not been fully resolved; High sound absorption possible

Method used

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  • Sound absorbing structure and vehicle component having sound absorbing properties
  • Sound absorbing structure and vehicle component having sound absorbing properties
  • Sound absorbing structure and vehicle component having sound absorbing properties

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0075] (A) Sound-absorbing structure

[0076] will refer to Figure 1 to Figure 6 A sound absorbing structure according to a first embodiment of the present invention will be described.

[0077] figure 1 is the external view of the sound-absorbing structure 1-11; figure 2 is an exploded perspective view of the essential parts of the sound-absorbing structure 1-11. In order to explain the constitution of this embodiment in an easy-to-understand manner, the size of the sound absorbing structure 1-11 does not exactly correspond to the actual size.

[0078] The sound absorbing structure 1 - 11 is composed of a case 10 and a vibrating member 20 . A casing 10 made of synthetic resin is molded into a hollow square cylinder with one end open and the other closed, wherein the casing is composed of a bottom 11 forming a bottom of the casing and side walls 12A to 12D.

[0079] The vibrating member 20 is a square member produced by molding synthetic resin having elasticity into a pl...

no. 3 example

[0174] will refer to Figure 13 and 14 A third embodiment of the present invention is described. exist Figure 13 in, with Figure 9 and 10 Component parts that are the same as those shown in are designated with the same reference numerals.

[0175] Figure 13 is a perspective view showing the appearance of a sedan 100 employing a sound absorber SA_2 according to a third embodiment of the present invention. A hood 101, four doors 102, and a trunk door 103 are each attached in an open / closed manner to a chassis 110 corresponding to a base of the vehicle structure. like Figure 10 A chassis 110 of the vehicle 100 is formed as shown. Compared to the second embodiment in which the sound absorber SA_1 is attached to the back pocket tray 130 , the third embodiment is designed to attach the sound absorber SA_2 to the roof 240 . Top 240 consists of top outer plate (corresponding to Figure 10 The top 115 in the middle) and the top inner plate 230 constitute.

[0176] The th...

no. 4 example

[0180] The fourth embodiment is characterized by attaching the box-shaped sound absorber SA_3 to the sun visor 330 of the vehicle 100 . Figure 15 is a developed view of the sun visor 330 attached to the upper part of the roof 115 of the vehicle 100, Figure 16 is along Figure 15 A cross-sectional view taken along line A-A in .

[0181] The sun visor 330 is composed of a plate-shaped light insulation part 340 and an L-shaped support rod 350 for rotatably supporting the light insulation part 340 .

[0182] The light-shielding part 340 is composed of a core material 341 formed of ABC resin (or engineering plastics) and a surface material 360 formed of a non-woven fabric having sound transmission properties. The core material 341 is covered with the surface material 360 so that the respective sides of the surface material 360 are bonded together to cover the surface and the back of the core material 341 .

[0183] A bracket 351 for attaching the sun visor 330 to the roof 115 ...

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Abstract

The invention provides a sound absorbing structure and a vehicle part with the same. The sound absorbing structure is constituted of a housing having a hollow portion and an opening and a vibration member composed of a board or diaphragm. The vibration member is a square-shaped material having elasticity composed of a synthetic resin and is bonded to the opening of the housing, thus forming an air layer closed inside the sound absorbing structure by the housing and the vibration member. In the sound absorbing structure, when the lateral/longitudinal dimensions of the air layer and characteristics of the vibration member (e.g. a Young's modulus, thickness, and Poisson's ratio) are set such that the fundamental frequency of a vibration occurring in a bending system falls within 5% and 65% of the resonance frequency of a spring-mass system, a vibration mode having a large amplitude occurs in a frequency band lower than the resonance frequency of the spring-mass system, this improving the sound absorption coefficient.

Description

technical field [0001] The invention relates to a sound-absorbing structure suitable for an acoustic room, in particular to a vehicle component with sound-absorbing properties. [0002] This application claims the priority of Japanese patent applications with application numbers 2008-22558, 2008-55367, 2008-69794, 2008-104965, 2008-69795, 2008-111481, 2008-223442, 2008-221316, 2008-219129, which The contents are hereby incorporated by reference in their entirety. Background technique [0003] Conventionally, various sound absorbing structures have been developed and disclosed in, for example, Patent Document 1 and Non-Patent Document 1. [0004] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2006-11412 [0005] Non-Patent Document 1: "Architectural Acoustics and Noise Prevention Plans" by Sho Kimura, Shokokusha Kabushiki Kaisha, February 20, 1981, page 150 [0006] Patent Document 1 teaches a sound absorbing structure (hereinafter referred to as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/172G10K11/16B60R13/08
Inventor 棚濑廉人中村康敬吉田笃史松下胜樋山邦夫
Owner YAMAHA CORP
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