Sound isolating wall assembly having at least one acoustic scatterer

Patent metadata

Field	Value
Publication number	US-11776522-B2
Application number	US-202117172582-A
Country	US
Kind code	B2
Filing date	Feb 10, 2021
Priority date	Nov 12, 2020
Publication date	Oct 3, 2023
Grant date	Oct 3, 2023

Abstract

A sound isolating wall assembly includes a plurality of walls defining a space between the plurality of walls. At least one acoustic scatterer is disposed within the space between the plurality of walls. The at least one acoustic scatterer has an opening and at least one channel. The at least one channel has a channel open end and a channel terminal end, with the channel open end being in fluid communication with the opening.

First claim

What is claimed is:

1. A sound isolating wall assembly comprising:
a plurality of walls, the plurality of walls defining a space between the plurality of walls;
at least one degenerative scatterer located within the space defining the plurality of walls;
the at least one degenerative scatterer having an opening and a plurality of channels, the plurality of channels each have a channel open end and a channel terminal end, the channel terminal ends being separate from each other;
wherein the plurality of channels extend parallelly along the length of the at least one degenerative scatterer; and
wherein the at least one degenerative scatterer has an acoustic monopole response and an acoustic dipole response, wherein the acoustic dipole response and the acoustic monopole response of the at least one degenerative scatterer have a resonant frequency that is substantially similar.

2. The sound isolating wall assembly of claim 1 , further comprising a porous material disposed within the space between the plurality of walls.

3. The sound isolating wall assembly of claim 1 , wherein the at least one degenerative scatterer is coupled to one of the plurality of walls.

4. The sound isolating wall assembly of claim 3 , wherein the at least one degenerative scatterer has a flat side, the flat side being coupled to one of the plurality of walls.

5. The sound isolating wall assembly of claim 4 , wherein the at least one degenerative scatterer has a non-planar side, the non-planar side having the opening, the non-planar side substantially facing toward the space between the plurality of walls.

6. The sound isolating wall assembly of claim 5 , wherein the at least one degenerative scatterer has a half-cylinder shape, the half-cylinder shape defining the non-planar side and the flat side.

7. The sound isolating wall assembly of claim 1 , wherein the at least one degenerative scatterer comprises a plurality of degenerative scatters.

8. The sound isolating wall assembly of claim 7 , wherein the plurality of degenerative scatters includes a first degenerative scatterer having a first resonant frequency and a second degenerative scatterer having a second resonant frequency.

9. The sound isolating wall assembly of claim 1 , wherein the sound isolating wall assembly is configured to absorb sound waves at a certain frequency generated by a source of a noise, wherein the certain frequency is substantially similar to a resonant frequency of the at least one degenerative scatterer.

10. The sound isolating wall assembly of claim 1 , wherein:
the plurality of channels includes a first channel and a second channel;
the first channel has a first channel open end and a first channel terminal end, the first channel open end being in fluid communication with the opening;
the second channel has a second channel open end and a second channel terminal end, the second channel open end being in fluid communication with the opening; and
wherein the first channel terminal end and the second channel terminal end are separate from one another.

11. The sound isolating wall assembly of claim 1 , wherein the plurality of channels includes at least three channels.

12. The sound isolating wall assembly of claim 1 , wherein the plurality of channels includes at least four channels.

13. The sound isolating wall assembly of claim 1 , wherein each channel of the plurality of channels have a substantially similar volume.

14. The sound isolating wall assembly of claim 1 , wherein a cross section along a width of the at least one degenerative scatterer defines a symmetrical shape having at least one line of symmetry.

15. The sound isolating wall assembly of claim 1 , further comprising:
a plurality degenerative scatterers forming an array of degenerate scatters
wherein the plurality of walls includes a first wall and a second wall, the first wall substantially facing the second wall;
the array of degenerate scatters located between the first wall and the second wall, wherein the array of degenerate scatters includes a number (N) of degenerative scatterers;
wherein a number (N) of the plurality degenerative scatterers is:
N=D /( c/f ); and

wherein D is a distance between the first wall and the second wall, c is the speed of sound in air, and f is the resonant frequency of the acoustic monopole response and the acoustic dipole response.

16. The sound isolating wall assembly of claim 1 , further comprising:
wherein the plurality of walls includes a first wall, a second wall, a third wall and a fourth wall;
the first wall substantially faces the second wall, the first wall and the second wall being connected to the third wall and the fourth wall; and
the third wall substantially faces the fourth wall.

17. The sound isolating wall assembly of claim 1 , wherein the space between the plurality of walls is substantially cuboid in shape.

18. The sound isolating wall assembly of claim 1 , wherein the plurality of walls form a duct structure for guiding a movement of air.

19. The sound isolating wall assembly of claim 1 , wherein the sound isolating wall assembly is configured to be used as a wall for a building structure.

Assignees

• Toyota Eng & Mfg North America
• Toyota Motor Co Ltd

Inventors

• Su Xiaoshi
• Banerjee Debasish
• Shintaku Yuji
• Nakajima Katsuhiko

Classifications

• G10K11/172 Primary

  using resonance effects · CPC title

• E04B1/84

  Sound-absorbing elements · CPC title

• G10K11/162

  Selection of materials · CPC title

• E04B1/8209 Primary

  sound absorbing devices (E04B1/8218, E04B1/8227 take precedence) · CPC title

• F24F13/24 Primary

  Means for preventing or suppressing noise · CPC title