Unlock instant, AI-driven research and patent intelligence for your innovation.

Combined frequency band type sound absorption composite structure

A composite structure and combined frequency band technology, applied to building components, building structures, sound insulation, etc., can solve the problems of limited space capacity, high technical and economic costs, and bulky sound-absorbing devices, and achieve low sound-absorbing frequency lower limit, suppression Low-frequency secondary structure noise, saving installation space

Active Publication Date: 2020-12-08
CHINA RAILWAY DESIGN GRP CO LTD
View PDF5 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, the size of traditional sound-absorbing materials or structures determines the lower limit of the frequency that can absorb sound waves. The greater the expected low-frequency sound absorption coefficient, the greater the thickness required for sound-absorbing materials or devices, which ultimately leads to bulky sound-absorbing devices. Engineering applications are subject to limited space capacity and high technical and economic costs, especially for 50-250Hz low-frequency noise, and there are few special high-performance sound-absorbing devices that can be engineered

Method used

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
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Combined frequency band type sound absorption composite structure
  • Combined frequency band type sound absorption composite structure
  • Combined frequency band type sound absorption composite structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] This embodiment provides a combined frequency band single-sided sound-absorbing composite structure.

[0051] like figure 1 and image 3 As shown, the combined frequency band single-sided sound-absorbing composite structure includes a frame 12, a first sealing plate 10, a second sealing plate 11, a first low-frequency sound-absorbing material block 7 and a second low-frequency sound-absorbing material block 8, the frame The outline is in the shape of a flat cuboid, including U-shaped plates with the same length, a neutral plate 3 , a first volute plate 4 and a second volute plate 5 .

[0052] Specifically, the U-shaped board is formed by sequentially connecting the left side board 1, the bottom board 6 and the right side board 2, the left and right side boards 1, 2 are parallel and perpendicular to the bottom board 6; the neutral board 3 is installed on the The middle part of the bottom plate 6 is parallel to the two side plates 1 and 2; the first volute plate 4 and t...

Embodiment 2

[0060] This embodiment provides a combined frequency band double-sided sound-absorbing composite structure.

[0061] see Figure 2 to Figure 6 , the double-sided sound-absorbing composite structure is basically the same as that of Example 1, except that the left and right side panels 1, 2 of the U-shaped panel continue to extend toward the back of the bottom panel 6, and then extend toward the sides of the two side panels. Extending in the opposite direction, the left corner plate 1a and the right corner plate 2a are respectively formed, and the left corner plate, the right corner plate and the bottom plate 6 enclose a third sound-absorbing cavity, and a medium-high frequency sound-absorbing plate 9 is installed in the third sound-absorbing cavity; The first sealing plate 10 and the second sealing plate 11 respectively seal two opposite openings of the third sound absorption cavity.

[0062] In this embodiment, the length L of the frame 12 is 600 mm, the width W is 600 mm, an...

Embodiment 3

[0069] Figure 8 Shown is another embodiment of the invention.

[0070] The combined frequency-band sound-absorbing composite structure shown in the figure has a flat cuboid shape, including a first sealing plate (not shown in the figure), a second sealing plate (not shown in the figure), and a frame with the same length, Multiple volute units, low-frequency sound-absorbing material blocks 25 and mid-high frequency sound-absorbing panels 29, each volute unit is composed of a vertical plate and a volute plate.

[0071] Described frame is made up of left side L-shaped board 21, right side L-shaped board 22 and base plate 26, and described left side L-shaped board 21 and right side L-shaped board 22 are arranged oppositely, and described base plate 26 is vertically installed on the left side L Between the type plate and the right L-shaped plate; the plurality of volute units are installed at intervals on the front surface of the bottom plate between the left L-shaped plate and t...

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

PUM

PropertyMeasurementUnit
Widthaaaaaaaaaa
Thicknessaaaaaaaaaa
Lengthaaaaaaaaaa
Login to View More

Abstract

The invention discloses a combined frequency band type sound absorption composite structure. The combined frequency band type sound absorption composite structure is composed of a left side plate, a right side plate, a middle vertical plate, a first volute plate, a second volute plate, a bottom plate, a first low-frequency sound absorption material block, a second low-frequency sound absorption material block, a medium-high frequency sound absorption plate, a first sealing plate, a second sealing plate, a first low-frequency sound diffraction trap and a second low-frequency sound diffraction trap. The structure is provided with two sound absorption surfaces with different sound absorption dominant frequency bands, the two sound absorption surfaces are used for absorbing low-frequency soundwaves and medium-high frequency sound waves respectively, and a full-frequency-band sound absorption effect is obtained after combination. Compared with a traditional space sound absorber, the soundabsorption composite structure has a lower sound absorption frequency lower limit and a thinner overall size, and the installation space is saved.

Description

technical field [0001] The invention relates to a sound-absorbing structure, in particular to a composite frequency-band sound-absorbing structure. Background technique [0002] Sound-absorbing materials or sound-absorbing structures usually refer to materials or structures with an average sound absorption coefficient exceeding 0.2. According to their sound-absorbing mechanism, they can be divided into two categories: porous sound-absorbing materials and resonant sound-absorbing structures. There are a large number of tiny connected pores inside the porous sound-absorbing material. The sound wave penetrates into the material along these pores, and rubs against the material to convert the sound energy into heat energy. This mechanism determines that it is difficult for low-frequency (long-wave) sound waves to interact with the pores. Therefore, the low-frequency sound absorption coefficient is poor, and it is usually necessary to reserve a certain depth of cavity at the rear ...

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

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): E04B1/84E04B1/86
CPCE04B1/84E04B1/86E04B2001/8423E04B2001/8438E04B2001/8452E04B2001/8428
Inventor 胡文林刘冀钊周铁征谷邛英赵世磊姜博龙齐春雨何宾陶然王少林周继超
Owner CHINA RAILWAY DESIGN GRP CO LTD