JP-7855847-B2 - Sound barrier assembly having at least one acoustic scatterer

JP7855847B2JP 7855847 B2JP7855847 B2JP 7855847B2JP-7855847-B2

Inventors

スー・シアオシー
デバシシュ・バナジー
新宅裕二
中島毅彦

Assignees

トヨタ自動車株式会社

Dates

Publication Date: 20260511
Application Date: 20211111
Priority Date: 20210210

Claims (9)

Multiple walls constituting an air duct, which define space between the multiple walls, The system comprises at least one acoustic scatterer located in the space between the plurality of walls, The plurality of walls include a first wall and a second wall that face each other, The at least one acoustic scattering body is a semiscattering body having an aperture, a first channel and a second channel, The first channel has an open end and a terminal end. The aforementioned second channel has a second channel open end and a second channel end, The at least one acoustic scatterer is The flat portion attached to the first wall, A semi-cylindrical portion, which is connected to the flat portion and formed in a semi-cylindrical shape, A channel defining portion is formed between the flat portion and the semi-cylindrical portion, and together with the semi-cylindrical portion, defines the first channel and the second channel. It has a separation section that connects the flat section and the channel defining section, and separates the first channel end and the second channel end from each other, The opening is formed at the top of the semi-cylindrical portion, A sound-insulating wall assembly in which the first channel open end and the second channel open end are in fluid communication with the opening formed at the top of the semi-cylindrical portion.
The sound-insulating wall assembly according to claim 1, further comprising a porous material disposed within the space between the plurality of walls.
The sound barrier assembly according to claim 1, wherein the at least one acoustic scatterer is a plurality of acoustic scatterers.
The plurality of acoustic scatterers are, A first acoustic scatterer having a first resonant frequency, The sound-insulating wall assembly according to claim 3, comprising a second acoustic scatterer having a second resonant frequency.
The sound barrier assembly is configured to absorb sound waves of a frequency band within the range of sound emitted by a noise source, which is generated by the noise source. The sound barrier assembly according to claim 1, wherein the frequency is substantially similar to the resonant frequency of the at least one sound scatterer.
Multiple walls constituting an air duct, which define space between the multiple walls, The system comprises at least one acoustic scatterer located in the space between the plurality of walls, The aforementioned plurality of walls include 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 are connected to the third wall and the fourth wall, The third wall is substantially adjacent to the fourth wall. The at least one acoustic scattering body is at least one modified scattering body having at least four apertures and at least four channels, Each of the at least four channels has an open end and a terminal end, and the terminal ends of the at least four channels are separated from each other. The at least one acoustic scattering body includes a cylindrical housing, The at least four openings are provided in the housing at intervals along the circumferential direction of the housing, The open end of each of the at least four channels is in fluid communication with each of the at least four openings. The aforementioned four openings are A first opening facing the first wall, A second opening facing the second wall, A third opening opposite the aforementioned third wall, The fourth wall includes a fourth opening facing the fourth wall, The at least one modified scattering material has an acoustic monopole response and an acoustic dipole response, A sound barrier assembly wherein the acoustic dipole response and the acoustic monopole response of the at least one modified scatterer have substantially similar resonant frequencies.
The array further comprises multiple modified scatterers that form an array of modified acoustic scatterers, The array of the modified acoustic scattering material is located between the first wall and the second wall. The array of modified acoustic scatterers comprises (N) acoustic scatterers, The number (N) of the aforementioned multiple modified scattering bodies is N = D/(c/f), The sound-insulating wall assembly according to claim 6, wherein D is the distance between the third wall and the fourth 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.
The soundproof wall assembly according to claim 1 or 6, wherein the space between the plurality of walls is substantially rectangular in shape.
The soundproof wall assembly according to claim 1 or 6, wherein the plurality of walls form a duct structure for guiding the movement of air.

Description

This disclosure generally relates to sound barrier assemblies, and more specifically to sound barrier assemblies comprising at least one acoustic scatterer. The background information provided is intended to provide a general context for this disclosure. The inventors' work, as described in this background section, and aspects of the specification that may not be considered prior art at the time of filing, are not expressly or implicitly considered prior art to this invention. The interior of a building, which may consist of one or more rooms, may experience noise pollution emanating from within or outside the building. For example, if a building is located near a street, rooms within that location may experience unwanted noise from vehicles, pedestrians, trains, etc. Furthermore, in some cases, unwanted noise may even be generated within the building itself. For instance, if someone is speaking loudly in one room, unwanted noise may enter other rooms. When constructing buildings and/or rooms within them, prior art typically relies on either highly reflective materials that reflect sound or porous materials that may absorb sound. However, both have drawbacks. For example, the performance of reflective materials is usually limited by the "law of mass," while porous materials do not offer high sound insulation. The "law of mass" states that if the mass per unit area doubles, the sound transmission loss (STL) increases by 6 decibels. Similarly, if the frequency doubles, the STL increases by 6 decibels. This effect makes it difficult to insulate low-frequency sounds using lightweight materials. Regarding porous materials, conventional porous sound-absorbing materials were only effective in reducing high-frequency (above 1 kHz) noise due to their high impedance characteristics. Furthermore, when the porosity of the material's microstructure is high, the sound transmission rate through the porous material increases. This section is a general summary of this disclosure and does not constitute a comprehensive disclosure of its entire scope or features. In one example, a sound barrier assembly includes multiple walls that define a space between the multiple walls. At least one acoustic scatterer is positioned within the space between the multiple 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 end, the channel open end being in fluid communication with the opening. At least one acoustic scatter used within a sound barrier assembly can take any one of a number of different forms. In one example, at least one acoustic scatter is in the form of a semi-scatterer and is attached to one of the multiple walls. In another example, at least one acoustic scatter is in the form of a modified scatterer located away from the multiple walls. In another example, the soundproof wall assembly described above may also include porous material located in the space between the multiple walls. By utilizing porous material in addition to at least one acoustic scatterer, both high-frequency and low-frequency noise can be effectively reduced. Further applicable areas and various methods for enhancing the disclosed technology will become apparent from the provided description. The descriptions and examples in this summary are for illustrative purposes only and are not intended to limit the scope of this disclosure. This instruction will be better understood from the detailed explanation and attached diagrams. This figure shows two different applications for a sound barrier assembly.This figure shows two different applications for a sound barrier assembly.This figure shows an example of a soundproof wall assembly using a semi-scattering material.Figure 2 shows detailed views of different examples of semi-scattering materials used in sound barrier assemblies.Figure 2 shows detailed views of different examples of semi-scattering materials used in sound barrier assemblies.This figure shows another example of a soundproof wall assembly that utilizes a semi-scattering material, which also uses porous materials.This figure shows an example of a soundproof wall assembly using a modified scattering material.Figure 5 shows detailed views of different examples of modified scattering materials used in sound barrier assemblies.Figure 5 shows detailed views of different examples of modified scattering materials used in sound barrier assemblies.This figure shows another example of a soundproof wall assembly that utilizes a modified scattering material, including porous materials. This instruction provides a soundproofing wall assembly that can be used in a variety of different applications, such as room walls and ducts that guide air from one location to another. Regardless of the application, the soundproofing wall assembly can reduce unwanted noise. A soundproof wall assembly may consist of multiple walls, for example, four walls defining the space between t