CN-114482311-B - Sound wall assembly with at least one acoustic diffuser

Abstract

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

Inventors

• SU XIAOSHI
• D. BANERJEE
• SHINTAKU YUJI
• NAKAJIMA KATSUHIKO

Assignees

• 丰田自动车工程及制造北美公司
• 丰田自动车株式会社

Dates

Publication Date

20260512

Application Date

20211112

Priority Date

20210210

Claims (17)

1. 1. A sound barrier assembly comprising: a plurality of walls defining a space therebetween; At least one acoustic diffuser located in a space between the plurality of walls; the at least one acoustic diffuser having an opening and at least one channel, and The at least one channel having a channel open end and a channel terminal end, the channel open end being in fluid communication with the opening; The at least one acoustic diffuser is coupled to one of the opposing two of the plurality of walls, the opening facing the space between the plurality of walls and facing the other of the opposing two walls; Wherein the at least one acoustic diffuser has a flat side coupled to the one of the opposing two of the plurality of walls, wherein the at least one acoustic diffuser has a non-planar side with the opening, the non-planar side facing the space between the plurality of walls.
2. 2. The sound-insulating wall assembly according to claim 1, further comprising a porous material disposed within the space between the plurality of walls.
3. 3. The sound wall assembly of claim 1, wherein the at least one acoustic diffuser has a semi-cylindrical shape defining the non-planar side and the planar side.
4. 4. The sound wall assembly of claim 1, wherein the acoustic diffuser is a plurality of acoustic diffusers.
5. 5. The sound wall assembly of claim 4, wherein the plurality of acoustic diffusers comprise a first diffuser having a first resonant frequency and a second diffuser having a second resonant frequency.
6. 6. The sound wall assembly of claim 1, wherein the sound wall assembly is configured to absorb sound waves of a particular frequency generated by a noise source, wherein the particular frequency is similar to a resonant frequency of the at least one acoustic diffuser.
7. 7. The sound barrier assembly of claim 1, wherein: The at least one channel includes a first channel and a second channel; the first channel having a first channel open end and a first channel terminal end, the first channel open end in fluid communication with the opening; the second channel having a second channel open end and a second channel terminal end, the second channel open end in fluid communication with the opening, and Wherein the first channel terminal and the second channel terminal are separated from each other.
8. 8. The sound barrier assembly of claim 1, wherein: the at least one acoustic diffuser is at least one degenerative diffuser having a plurality of channels each having an open end and a terminal end, the terminal ends of the plurality of channels being separated from one another, and Wherein the at least one degenerative diffuser 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 diffuser have similar resonant frequencies.
9. 9. The sound wall assembly of claim 8, wherein the plurality of channels comprises at least three channels.
10. 10. The sound wall assembly of claim 8, wherein the plurality of channels comprises at least four channels.
11. 11. The sound wall assembly of claim 8, wherein each of the plurality of channels has a similar volume.
12. 12. The sound wall assembly of claim 8, wherein a cross-section along a width of the at least one degenerative diffuser defines a symmetrical shape having at least one line of symmetry, the symmetrical shape having an outer perimeter, wherein the open ends of the plurality of channels are adjacent to the outer perimeter.
13. 13. The sound wall assembly according to claim 8, further comprising: a plurality of degenerative scatterers forming a column of degenerative acoustic scatterers, Wherein the plurality of walls includes a first wall and a second wall, the first wall facing the second wall; The array of degenerative acoustic scatterers is located between the first wall and the second wall, wherein the array of degenerative acoustic scatterers includes N acoustic scatterers; wherein the number N of the plurality of degenerative scatterers is: And (C) sum Where D is the distance between the first wall and the second wall, c is the velocity of sound in air, and f is the resonant frequency of the acoustic monopole response and the acoustic dipole response.
14. 14. The sound insulating wall assembly according to claim 1, said plurality of walls comprising: A first wall, a second wall, a third wall, and a fourth wall; the first wall facing the second wall, the first wall and the second wall being connected to the third wall and the fourth wall, and The third wall faces the fourth wall.
15. 15. The sound insulating wall assembly according to claim 1, wherein the space between the plurality of walls is in the shape of a cuboid.
16. 16. The sound barrier assembly of claim 1, wherein the plurality of walls are walls of a duct structure for guiding air movement.
17. 17. The sound barrier assembly of claim 1, wherein the sound barrier assembly is configured to be used as a wall of a building structure.

Description

Sound wall assembly with at least one acoustic diffuser Technical Field The present disclosure relates generally to a sound wall assembly, and more particularly, to a sound wall assembly including at least one acoustic diffuser. Background The background description provided generally presents the background of the present disclosure. Work of the presently named inventors, to the extent it may be described in this background section, as well as aspects of the description that may not otherwise qualify as prior art at the time of filing, are neither expressly nor impliedly admitted as prior art against the present disclosure. The interior of a building, which may be comprised of one or more rooms, may experience noise pollution from the interior or exterior of the building. For example, if a building is located near a street, a room located within the building may experience undesirable noise, such as noise generated by vehicles, pedestrians, trains, and the like. In addition, in some cases, undesirable noise may be generated within the building itself. For example, a person in one room may speak loudly, resulting in unwanted noise entering another room. When constructing buildings and/or rooms within buildings, the prior art generally relies on highly reflective materials that reflect sound or porous materials that are capable of absorbing sound. However, both have drawbacks. For example, the performance of reflective materials is often limited by "mass-law", whereas porous materials do not provide high sound insulation. "law of mass" states that doubling the mass per unit area increases the sound propagation loss ("STL: sound transmission loss") by 6 dB. Similarly, doubling the frequency increases the sound propagation loss by 6 db. This effect makes it difficult to isolate low frequency sounds using lightweight materials. With respect to porous materials, conventional porous sound absorbing materials are only effective in reducing high frequency (greater than 1 khz) noise due to their high impedance characteristics. If the microstructure of the material has a large porosity, sound transmission through the porous material is high. Disclosure of Invention This section generally outlines the disclosure and is not a comprehensive disclosure of its full scope or all of its features. In one example, a sound insulating wall assembly includes a plurality of walls defining a space therebetween. At least one acoustic diffuser is disposed in the space between the plurality of walls. The at least one acoustic diffuser has an opening and at least one channel. The at least one channel has a channel open end and a channel terminal end, wherein the channel open end is in fluid communication with the opening. The at least one acoustic diffuser used within the sound wall assembly may take any of a number of different forms. In one example, the at least one acoustic diffuser is in the form of a half diffuser and is attached to one of the plurality of walls. In another example, the at least one acoustic diffuser is in the form of a degenerative diffuser remote from the plurality of walls. In another example, the above-described sound insulating wall assembly may further include a porous material located in a space between the plurality of walls. By using a porous material in addition to the at least one acoustic diffuser, high frequency and low frequency noise can be effectively reduced. Further areas of applicability as well as various methods of enhancing the disclosed technology will become apparent from the description provided. The description and specific examples in this summary are intended for purposes of illustration only and are not intended to limit the scope of the present disclosure. Drawings The present teachings will become more fully understood from the detailed description and the accompanying drawings, wherein: FIGS. 1A and 1B illustrate two different applications of the sound barrier assembly; FIG. 2 illustrates one example of a sound wall assembly utilizing semi-diffusers; FIGS. 3A and 3B show detailed views of different examples of semi-diffusers used in the sound wall assembly of FIG. 2; FIG. 4 illustrates another example of a sound barrier assembly utilizing a semi-diffuser, which also utilizes a porous material; FIG. 5 illustrates one example of a sound wall assembly utilizing a degenerative diffuser; FIGS. 6A and 6B show detailed views of different examples of degenerative diffusers used in the sound wall assembly of FIG. 5, and Fig. 7 shows another example of a sound barrier assembly utilizing a degenerative diffuser, which also utilizes a porous material. For the purpose of describing certain aspects, the drawings are presented herein to illustrate the general features of the devices of the present technology. The drawings may not accurately reflect the features of any given aspect and are not necessarily intended to define or limit specific embodiments within the scope of the technology. Further,