Angle independent acoustic structures for broadband sound absorption and sound transmission loss

Patent metadata

Field	Value
Publication number	US-2025095622-A1
Application number	US-202318470535-A
Country	US
Kind code	A1
Filing date	Sep 20, 2023
Priority date	Sep 20, 2023
Publication date	Mar 20, 2025
Grant date	—

Abstract

An acoustic structure includes at least one acoustic scatterer that is angle independent and has multiple resonant frequencies. Each acoustic scatterer contains at least one repeated cell. Each cell contains at least two distinct resonant channels capable of absorbing sound and improving sound transmission loss at distinct frequencies. Each resonant channel is identical to at least one other channel within the acoustic scatterer.

First claim

1 . An acoustic structure comprising:
an acoustic scatterer comprising a plurality of repeating cells with a corresponding plurality of distinct resonant channels such that the acoustic scatterer is an angle independent broadband acoustic absorber.

2 . The acoustic structure according to claim 1 , wherein the plurality of repeating cells are positioned about one or more of a central axis and a central plane of the acoustic scatterer.

3 . The acoustic structure according to claim 1 , wherein the plurality of repeating cells are triangular prism shaped.

4 . The acoustic structure according to claim 1 , wherein the plurality of repeating cells are triangular prism shaped and positioned about a central axis of the acoustic scatterer.

5 . The acoustic structure according to claim 1 , wherein the plurality of repeating cells are triangular prism shaped and positioned about a central axis of the acoustic scatterer, and the acoustic scatterer is cylindrical shaped.

6 . The acoustic structure according to claim 1 further comprising a cover plate attached to an end of the acoustic scatterer.

7 . The acoustic structure according to claim 6 further comprising another cover plate attached to another end of the acoustic scatterer.

8 . The acoustic structure according to claim 1 further comprising a first cover plate attached to a first end of the acoustic scatterer and a second cover plate attached a second opposing end of the acoustic scatterer.

9 . The acoustic structure according to claim 1 , wherein the plurality of repeating cells is four repeating cells.

10 . The acoustic structure according to claim 1 , wherein the plurality of repeating cells are identical repeating cells.

11 . The acoustic structure according to claim 1 , wherein the plurality of repeating cells comprises a first set of repeating cells and a second set of repeating cells that are not identical to the first set of repeating cells.

12 . The acoustic structure according to claim 1 , wherein the acoustic scatterer is a plurality of acoustic scatterers.

13 . The acoustic structure according to claim 12 , wherein the plurality of acoustic scatterers comprises a first set of acoustic scatterers and a second set of acoustic scatterers that are different than the first set of acoustic scatterers.

14 . The acoustic structure according to claim 13 , wherein the first set of acoustic scatterers absorb more than 75% of soundwaves within a first frequency range and the second set of acoustic scatterers absorb more than 75% of soundwaves within a second frequency range that is different than within the first frequency range.

15 . An acoustic structure comprising:
a plurality of acoustic scatterers each comprising a plurality of repeating cells with a corresponding plurality of distinct resonant channels such that the plurality of acoustic scatterers are angle independent broadband acoustic absorbers.

16 . The acoustic structure according to claim 15 , wherein the plurality of repeating cells are positioned about a central axis of a corresponding acoustic scatterer.

17 . The acoustic structure according to claim 16 , wherein the plurality of repeating cells are triangular prism shaped.

18 . The acoustic structure according to claim 17 further comprising two cover plates attached to opposing ends of each of the plurality of acoustic scatterers.

19 . An acoustic structure comprising:
a cylindrical shaped acoustic scatterer; and two cover plates attached to opposing ends of the cylindrical shaped acoustic scatterer, the cylindrical shaped acoustic scatterer comprising a plurality of repeating cells positioned about a central axis of the cylindrical shaped acoustic scatterer such that the cylindrical shaped acoustic scatterer is an angle independent broadband acoustic absorber.

20 . The acoustic structure according to claim 19 , wherein the plurality of repeating cells comprises a first set of repeating cells and a second set of repeating cells that are not identical to the first set of repeating cells.

Assignees

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

Inventors

• Su Xiaoshi
• Banerjee Debasish
• Miwa Tomohiro
• Nakahara Miki
• EMOTO Reimi
• Sakamoto Mizuki
• Sone Toyohiro

Classifications

• G10K11/172 Primary

  using resonance effects · CPC title