KR100240212B1 - Sound wave phase shift device and sound insulating wall - Google Patents

Abstract

It is an object of the present invention to increase the attenuation effect due to mutual interference of sound waves by greatly displacing the phase of incident sound waves.

The porous member 15 made of a porous material is attached to the outer circumference of the sound insulation plate assembly 14 formed by combining a plurality of sound insulation plates 12 and 13, and an independent plurality of the volume of the porous member 15 having different volumes. To form the space 16.

Description

Sound Wave Phase Change Device and Soundproof Wall

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a sectional view of principal parts of a soundproof wall having a sound wave phase changing apparatus according to Embodiment 1 of the present invention.

2 is an explanatory diagram showing the action of the sound barrier of FIG.

FIG. 3 is a relation diagram showing an example of a phase difference θ between incident sound waves and reflected sound waves with respect to frequency f in the sound wave phase change device of FIG.

4 is a sectional view of principal parts of a soundproof wall having a sound wave phase change device according to Embodiment 2 of the present invention.

FIG. 5 is an explanatory diagram showing the action of the sound barrier of FIG. 4; FIG.

6 is a sectional view of principal parts of a sound wave phase change apparatus according to Embodiment 3 of the present invention.

7 is a sectional view of principal parts of the acoustic wave phase change device according to Embodiment 4 of the present invention.

8 is a sectional view showing the principal parts of an acoustic wave phase change device according to Embodiment 5 of the present invention.

9 is a sectional view of principal parts of the sound wave phase change apparatus according to Embodiment 6 of the present invention.

10 is a sectional view of principal parts of a sound wave phase change apparatus according to Embodiment 7 of the present invention.

11 is a sectional view showing the principal parts of a modification of FIG.

12 is a sectional view of principal parts of a sound wave phase change apparatus according to Embodiment 8 of the present invention.

13 is a sectional view showing the principal parts of a modification of FIG.

Fig. 14 is a sectional view of principal parts of a sound wave phase change apparatus according to Embodiment 9 of the present invention.

Fig. 15 is a sectional view of principal parts of a sound wave phase change apparatus according to Embodiment 10 of the present invention.

Fig. 16 is a sectional view of principal parts of an acoustic wave phase change device, according to Embodiment 11 of the present invention.

Fig. 17 is a sectional view showing the principal parts of an acoustic wave phase change device according to Embodiment 12 of the present invention.

18 is a sectional view of principal parts of a sound wave phase change apparatus according to Embodiment 13 of the present invention.

19 is a plan view showing a modification of FIG. 18;

20 is a plan view showing another modification of FIG.

21 is a schematic perspective view of an acoustic wave phase change device according to Embodiment 14 of the present invention.

22 is a schematic perspective view showing a modification of FIG.

23 is an explanatory diagram showing an example of a conventional sound insulation wall.

24 is an explanatory diagram showing another example of a conventional sound barrier.

FIG. 25 is an explanatory diagram showing the operation of the sound barrier of FIG. 23; FIG.

FIG. 26 is a clarity diagram showing the operation of the sound barrier of FIG. 24. FIG.

* Explanation of symbols for main parts of the drawings

11: sound insulation panel 12: first sound insulation panel

13: 2nd sound insulation board 14, 31: sound insulation board assembly

15, 26, 28, 35, 38, 39, 40: porous member

16: space part

17, 21, 24, 25, 27, 30, 34, 36, 37, 41: sound wave phase change device

22, 29: each part 32: 3rd sound insulation board

33: fourth sound insulation board

The present invention relates to a sound wave phase change device that is provided around a sound source or a propagation path to advance or delay a phase of a sound wave, and a soundproof wall using the sound wave phase change device.

FIG. 23 is an explanatory diagram showing a conventional soundproof wall shown in Japanese Patent Application Laid-Open No. 51-46969, for example.

In the figure, the sound insulating wall 2 is attached to the sound insulating wall 1 along the upper end part.

The shape and attachment structure of the sound absorbing material 2 include various types as shown in FIGS. 23A to 23G.

Moreover, FIG. 24 is explanatory drawing which shows the other example of the conventional soundproof wall shown by Unexamined-Japanese-Patent No. 52-91514.

In the figure, the non-transmissive body 3 is attached to the sound insulation wall 1 along the upper end part.

The non-transmissive body 3 has a structure that prevents the transmission of sound waves.

The shape and attachment structure of the non-transmissive body 3 also include various types, as shown in 24a to h.

Next, FIG. 25 is an explanatory diagram showing the operation of the sound barrier of FIG.

The sound waves 5a radiated from the sound source 4 and directly collide with the sound absorbing material 2 and the sound waves 5b reflected from the sound insulating wall 1 and impinge on the sound absorbing material 2 are absorbed by the sound absorbing material 2.

Therefore, the sound wave radiated to the outside beyond the soundproof wall becomes only the sound wave 5c which diffracts the upper side of the sound absorbing material 2, and the sound passing over the soundproof wall is attenuated.

FIG. 26 is an explanatory diagram showing the operation of the sound barrier of FIG.

Sound waves 5d directly impinging on the non-transmissive body 3 and sound waves 5e reflected on the sound insulating wall 1 and impinging on the non-transparent body 3 are respectively reflected on the non-transparent body 3.

Some of these sound waves 5d and 5e are shifted in phase due to the difference in path length with respect to the phase of the sound wave 5c diffracting the non-transmissive body 3.

For this reason, the sound waves 5d and 5e and the sound wave 5c interfere with each other, thereby weakening both sound waves, and the sound passing over the soundproof wall is attenuated.

However, in the conventional soundproof wall using the sound absorbing material 2 as described above, the sound wave 5c diffracted by the suction material 2 cannot be attenuated.

Moreover, in the soundproof wall using the non-transmissive body 3, since it is only the displacement of the phase by the difference of the path length resulting from a shape, there is little sound attenuation effect by mutual interference.

The present invention has been made to solve the above problems, the sound wave phase change device that can greatly shift the phase of the incident sound wave, thereby increasing the attenuation effect by the mutual interference of sound waves and The purpose is to obtain a sound barrier.

The sound wave phase change device according to the present invention comprises a porous member made of a porous material and a plurality of sound insulating plates, which are combined to form a plurality of independent space portions supporting the porous member and having different volumes in the distribution of the porous member. It is provided with a sound insulating board assembly.

The acoustic wave phase change device according to the present invention uses a porous member made of a porous material which is formed by welding a large number of plastic particles partially.

In the acoustic wave phase change device according to the present invention, the sound insulating plate and the porous member exposed to the outside are joined to form corner portions.

The acoustic wave phase change device according to the present invention uses a plate-like porous member and changes its thickness.

The sound wave phase change device according to the present invention changes the thickness of the porous member by changing the number of laminated sheets.

The acoustic wave phase change device according to the present invention uses a plate-like porous member having a cross-sectional shape that is bent to increase the area where sound waves are incident.

The sound wave phase change device according to the present invention changes the size of the cross section of the porous member along its longitudinal direction so that the area where the sound wave of the porous member is incident increases.

In the acoustic wave phase change device according to the present invention, the sound insulating plate constituting the bottom of the space portion is inclined in the horizontal direction, and the porous member is coupled to the lower end.

The sound wave phase change device according to the present invention uses a material that transmits light as a material of the porous member and the sound insulating plate assembly.

The soundproof wall according to the present invention is attached along the upper end of the soundproof panel and the porous member made of a soundproof panel and a porous material installed near the sound source, and is configured by combining a plurality of sound insulating plates, and supports the porous member and makes it porous. A sound wave phase change device having a sound insulating plate assembly forming a plurality of independent space portions having different volumes in the back portion of the member is provided.

[Embodiment of the Invention]

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described according to drawing.

Embodiment

FIG. 1 is a sectional view of principal parts of a soundproof wall having a sound wave phase change device according to the first embodiment of the sealing of the present invention, and FIG.

In the figure, the sound insulation panel 11 is provided in the side part of the road through which the sound source (or noise source) 4, such as an automobile, passes.

The first sound insulation board 12 is vertically fixed to the upper end of the sound insulation panel 11.

A plurality of second sound insulation boards 13 are horizontally fixed to both side surfaces of the first sound insulation board 12.

The first and second sound insulating plates 12 and 13 are made of, for example, iron plates, plastic plates, or the like.

Moreover, the sound insulation board assembly 14 is comprised by the 1st and 2nd sound insulation boards 12 and 13. As shown in FIG.

The cylindrical porous member 15 is provided in the outer peripheral part of the sound insulation board assembly 14.

The porous member 15 extends along the longitudinal direction of the soundproof panel 11.

In addition, an independent space portion 16 having a different volume is formed in the distribution of the porous member 15.

The sound wave phase change device 17 according to the first embodiment has a porous member 15 and a sound insulating plate assembly 14 serving as a reinforcing material.

Moreover, the sound wave wall of this Embodiment 1 is comprised by this acoustic wave phase change apparatus 17 and the sound insulation panel 11. FIG.

As the material of the porous member 15, plastic, ceramic, foamed metal, or the like can be used.

For example, when plastic is used, a method of manufacturing the porous member 15 by partially heating and welding the plastic particles may be applied.

Such a method is shown, for example, in Unexamined-Japanese-Patent No. 2-289333.

As the plastic material, for example, polypropylene resin, acrylic resin, vinyl chloride resin, ABS resin or polycarbonate resin can be used.

According to the method of welding plastic particles, the porous member 15 of desired formation can be shape | molded easily with a metal mold | die.

Next, the operation will be described.

2, a porous member 15 is disposed between the sound wave 18 directly incident on the sound wave phase changing device 17 and the sound wave 19 reflected from the soundproof panel 11 and incident on the sound wave phase changing device 17. As shown in FIG. It enters into the space part 16 through], and is reflected by the sound insulation boards 12 and 13 which comprise the wall part of the space part 16. As shown in FIG.

Then, it passes out of the acoustic wave phase change device 17 through the porous member 15.

Here, when the sound wave 18 enters the sound wave phase change device 17 at the incident angle β and exits as the sound wave 18a, the normal acoustic impedance Z of the sound wave phase change device 17 is Z = ρa / cos (β). ) × (Pi + Pr) / (Pi-Pr).

Where ρa (ρ: air density, a: sound velocity in air) is the characteristic impedance of air, Pi is the sound pressure of the incident sound wave 18, Pr is the reflected sound wave (sound wave exiting from the acoustic phase change device 17) ( 18a) sound pressure.

From the above equation, the sound pressure reflectance R of the sound wave phase change device 17 can be expressed as R = Pr / Pi = (Z cos (β) -ρa) / (Zcos (β) + ρa).

From this equation, the phase difference θ between the incident sound wave 18 and the reflected sound wave 18a is represented by θ = arg (R).

In addition, since the porous member 15 in the acoustic wave phase change device 17 has an acoustic mass m and an acoustic resistance r as acoustic characteristics, and the space portion 16 has an acoustic capacitance c as acoustic characteristics, The normal acoustic impedance Z of the acoustic wave phase change device 17 is expressed as Z = r + j2πfm + 1 / j2πfc at the frequency f.

With j ² = -1.

As described above, the phase difference θ between the incident acoustic wave 18 and the reflected acoustic wave 18a changes with the normal acoustic impedance Z.

According to the acoustic wave phase change device 17 of the first embodiment, the normal acoustic impedance Z can be controlled, and the phase difference can be changed.

Specifically, the acoustic mass m and the acoustic resistance r are controlled by the volume of the space portion 16 by the thickness and the porosity of the porous member 15, respectively, to control the acoustic capacitance c by the desired phase. Properties are obtained.

In addition, when using the above-mentioned plastic particle as a material of the porous member 15, the void can be easily controlled by the welding degree of plastic particle mutually.

3 is a relation diagram showing an example of the phase difference θ between the sound acoustic wave 18 and the reflected sound wave 18a with respect to the frequency f in the sound wave phase change device 17.

In the figure, the phase difference θ of 180 degrees or -180 degrees indicates that the phase of the incident sound wave 18 is reversed and reflected as the reflected sound wave 18a.

As described above, when the phase difference θ becomes 180 degrees or -180 degrees, the reflected sound waves 18a become inverse phase with the sound waves 20 diffracting the sound phase changer 17, so that both of them cancel each other out so that the overall sound waves are greatly reduced. Will be attenuated.

As described above, according to the acoustic wave phase change device 17 of Embodiment 1, the phase of the incident sound wave can be largely displaced, and therefore the attenuation effect by the mutual interference of the sound waves can be enhanced.

In addition, since the plurality of independent space portions 16 having different volumes exist in the distribution of the porous member 15, it is possible to obtain a plurality of phase characteristics suitable for different frequencies and to enhance the attenuation effect for sound waves having a wider frequency. Can be.

In addition, by using the partially welded plastic particles as the material of the porous member 15, it is possible to easily mold into various shapes, and to adjust the void ratio easily.

In addition, as a material of the sound insulating plate assembly 14, the porous member 14, and the porous member 15, for example, by using a light transmitting material such as transparent acrylic resin, vinyl chloride resin, ABS resin or polycarbonate resin, When used as a sound barrier, it can prevent that a circumference becomes dark.

Example 2

Next, FIG. 4 is a sectional view showing the main parts of the soundproof wall having the sound wave phase changing apparatus according to Embodiment 2 of the present invention, and FIG. 5 is an explanatory diagram showing the operation of the soundproof wall of FIG.

In the first embodiment, the cross-sectional shape of the sound wave phase change device 17 is circular, but in the second embodiment, the plate-shaped sound wave phase change device 21 having a substantially semicircular cross section is used.

Moreover, the 2nd sound insulation board 13a of the lowest part exposed to the exterior, and the porous member 15 are joined so that the corner part (edge part) 22 may be formed.

The other configuration is the same as that of the first embodiment.

Next, the operation will be described.

The sound wave 18 which is incident directly on the sound wave phase change device 21 is displaced in phase as in the first embodiment.

In addition, the sound wave 23 reflected by the soundproof panel 11 and passing through the corner portion 22 has a phase shifted by, for example, 180 degrees due to the phase change effect of the shape of the corner portion 22.

Thus, the sound waves 18a and 23a whose phases are displaced and the sound waves 20 diffracting the upper side of the sound wave phase change device 21 are canceled with each other so that the whole sound waves are attenuated.

As described above, in the acoustic wave phase change device 21, as compared with the one having a circular cross section as shown in FIG.

Moreover, since the corner part 22 is provided, the phase change effect by the shape of this corner part 22 is also acquired.

Moreover, since each part 22 is located in the both sides of the sound wave phase change device 21, the sound attenuation effect is acquired even in either side of the sound wave phase change device 214.

[Embodiment 3]

Next, FIG. 6 is a sectional view of principal parts of the acoustic wave phase change device according to Embodiment 3 of the present invention.

In this example, the cross-sectional shape of the acoustic wave phase change device 24 is substantially fan-shaped.

In such an apparatus, the whole can be further downsized as compared with the second embodiment.

In addition, the same sound reduction effect as that of the second embodiment is obtained with respect to the sound source on the side of each portion 22.

[Embodiment 4]

Next, FIG. 7 is a sectional view showing the principal parts of the sound wave phase changing apparatus according to Embodiment 4 of the present invention.

In the first to third embodiments, the curved porous member 15 is shown. In the acoustic wave phase change device 25 according to the fourth embodiment, the plate-like porous member 26 is used.

Thus, by making the porous member 26 into a flat plate shape, manufacture and assembly can be made easy.

Moreover, since the leg part 22 is provided, the same sound damping effect as Embodiment 3 is obtained.

[Embodiment 5]

Next, FIG. 8 is a sectional view of principal parts of the acoustic wave phase change device according to Embodiment 5 of the present invention.

In each of the above embodiments, one porous member is shown, but in the acoustic wave phase change device 27 of this example, a plurality of divided porous members 28 are used.

The corner part 29 is formed in the junction part of each porous member 28 and the sound insulation board 13.

In such a sound wave phase change device 27, not only the phase of the sound wave incident on the porous member 28 is shifted, but also the phases are also changed by the corner portions 22 and 29, so that a large damping effect is obtained.

In addition, in FIG. 8, although the flat porous member 28 is shown, it is good also as a corrugated shape or a wave-like cross section.

[Embodiment 6]

9 is a sectional view of principal parts of the acoustic wave phase change device according to Embodiment 6 of the present invention.

The acoustic wave phase change device 30 of this example uses a plate-like porous member 26, and has a cross-sectional shape in which approximately seven degrees and up and down are reversed.

Also with the acoustic wave phase change device 30 having such a shape, the same sound attenuation effect as that of the third embodiment can be obtained.

[Embodiment 7]

10 and 11 are sectional views showing the principal parts of the sound wave phase changing apparatus according to Embodiment 7 of the present invention.

In the figure, the sound insulating plate assembly 31 includes the first and second sound insulating plates 12 and 13, the third sound insulating plate 32 on the arc of the cross section, and the third sound insulating plate 32. It has two 4th sound insulation board 33 arrange | positioned radially from the.

The acoustic wave phase change device 34 has a sound insulating plate assembly 31 and a porous member 35 in the shape of an arc of a cross section.

The plate-like porous member 35 is made of the same material as in the above embodiments, but its thickness is changing.

The thing of FIG. 11 made the thickness of the edge part on the opposite side to the porous member 35 of FIG. 10 thick.

Next, the operation will be described.

The porous member 35 in the acoustic wave phase change device 34 has an acoustic mass m and an acoustic resistance r as acoustic characteristics, and the space portion 16 has an acoustic capacity c as acoustic characteristics.

Here, by changing the thickness of the porous member 35, the acoustic mass m and the acoustic deflection r can be controlled, and a desired phase characteristic is obtained.

In addition, although the thickness of the porous member 35 changes continuously in FIG. 10 and FIG. 11, you may change it discontinuously.

[Embodiment 8]

12 and 13 are sectional views of the main parts of the acoustic wave phase change device according to Embodiment 8 of the present invention.

In the acoustic wave phase change device 36 of this example, a plate-like porous member 15 having the same thickness is used, but the thickness of the whole is changed by laminating the porous members 15.

FIG. 13 shows an example of lamination different from that of FIG.

The sound wave phase change device 36 also obtains the same effects as in the seventh embodiment.

[Embodiment 9]

Next, FIG. 14 is a sectional view of principal parts of the acoustic wave phase change device according to Embodiment 9 of the present invention.

In the acoustic wave phase change device 37 of this example, the porous members 38 and 39, which are curved in cross section, are used in place of the flat porous member 28 shown in FIG.

As described above, by bending the cross-sectional shapes of the porous members 38 and 39, their substantial surface area, that is, the area where sound waves are incident, is larger than the projection area.

As a result, the apparent acoustic scheme m and the acoustic deflection r become smaller, and phase difference characteristics closer to ± 180 degrees are obtained.

Therefore, more excellent sound attenuation effect can be obtained.

[Embodiment 10]

In addition, the cross-sectional shape of the porous member is not limited to FIG. 14, for example, as shown in FIG. 15, a cross-sectional porous member 40 may be used, and the same effect is obtained when the surface area is larger than the projection area. Obtained.

[Embodiment 11]

16 is a sectional view of principal parts of the sound wave phase change apparatus according to Embodiment 11 of the present invention.

In the acoustic wave phase change device 41 of this example, the sound insulation plate constituting the bottom of the space portion 16, that is, the second sound insulation plate 13, is inclined with respect to the horizontal direction, respectively, and is porous at the lower end. The member 15 is engaged.

Other configurations are the same as those in the third embodiment.

In such a sound wave phase change device 41, water penetrating the porous member 15 and entering the space portion 16 flows along the second sound insulating plate 13, and the porous member (near the corners 22) ( 15) is discharged to the outside.

Therefore, when the acoustic wave phase change device 41 is applied to the soundproof wall for outdoor use, excellent measures can be facilitated.

In addition, the damping effect is the same as that of Embodiment 3.

Embodiment 12

17 is a sectional view of principal parts of the sound wave phase changing apparatus according to Embodiment 12 of the present invention.

In the acoustic wave phase change device 42 of this example, a lighting device 43 such as a fluorescent lamp is provided in the sound insulation panel assembly 31.

In addition, transparent or translucent acrylic resins, vinyl chloride resins, ABS resins, polycarbonate resins, and the like are used as materials for the porous member 15 and the sound insulating plate assembly 31.

In such a sound wave phase change device 42, a soundproof wall can also be used as a lighting device.

Moreover, the same sound damping effect as Embodiment 3 is obtained.

[Embodiment 13]

FIG. 18 is a plan view showing the configuration of an acoustic wave phase change device according to Embodiment 13 of the present invention, and the cross-sectional shape is the same as that of FIG.

In the acoustic wave phase change device 21 of this example, the size of the entire cross section is changed along the longitudinal direction so that the area where sound waves are incident is increased.

In this acoustic wave phase change device 21, since the actual surface area is larger than the projected area, the apparent acoustic mass m and the acoustic resistance r can be made smaller, and the characteristics of the phase difference closer to ± 180 degrees are obtained. Better sound attenuation is obtained.

In addition, in FIG. 18, although the planar shape of the both sides of the sound wave phase change apparatus 21 was made into a corrugated shape, it is not limited to this, For example, it may be set as the broken line shape as shown in FIG. .

The planar shape of one side portion may be changed as shown in FIG. 20 with respect to the acoustic wave phase change device 24 having a cross-sectional shape as shown in FIG.

Embodiment 14

Next, FIG. 21 is a schematic perspective view of the sound wave phase changing apparatus according to Embodiment 14 of the present invention.

In each of the above embodiments, it is shown that a separate sound wave phase change device is attached to the soundproof panel, but in this example, the part of the soundproof panel 11 and the part of the sound wave phase change device 24 are previously manufactured as an integrated body. have.

As a result, the number of parts and the installation can be simplified by the common use of structural materials.

FIG. 23 is a schematic perspective view showing another example of FIG.

In this example, both longitudinal end portions 11a of the portion of the soundproof panel 11 extend from the portion of the acoustic wave phase change device 24.

Such a soundproof wall is provided easily by providing the cross-section H type | mold pillars (not shown) at intervals, and inserting the both ends 11a of the soundproof panel 11 into the groove | channel of the cross-section H type | mold pillar.

In the case where the sound wave phase change device and the soundproof panel are integrated, the portion of the sound wave phase change device can be modified as shown in the above embodiments.

Incidentally, in each of the above embodiments, only the case where the sound wave phase change device is applied to the soundproof wall is shown, but it is also possible to install and use the sound wave phase change device in structures other than soundproof panels such as buildings.

As described above, the sound wave phase change device of the present invention is composed of a porous member made of a porous material and a plurality of sound insulation plates, and forms a plurality of independent space portions supporting the porous member and having different volumes on the back of the porous member. Since the sound insulating plate assembly is provided, the phase of the incident sound wave can be largely displaced, thereby enhancing the attenuation effect due to the mutual interference of the sound waves.

The sound wave phase change device of the present invention uses a porous member made of a porous material which is partially welded with a large number of plastic particles, so that the porous member can be easily formed into various shapes and at the same time the porosity of the porous member You can easily adjust the void.

Since the sound wave phase changing device of the present invention is joined so that the sound insulating plate and the porous member exposed to the outside form the respective portions, the phase can be changed by the respective portions in addition to the phase change caused by the porous member and the space portion. The effect can be enhanced.

The acoustic wave phase change device of the present invention uses a tubular porous member and changes its thickness, so that the acoustic mass and the acoustic resistance can be controlled, and the desired phase characteristics can be obtained.

The sound wave phase change device of the present invention changes the thickness of the porous member by changing the number of stacked sheets, so that the acoustic mass and the acoustic resistance can be easily controlled.

The sound wave phase change device of the present invention uses a plate-like porous member having a cross-sectional shape that is bent to increase the area where sound waves are incident, so that the apparent acoustic mass and acoustic resistance can be made smaller and closer to ± 180 degrees. Phase difference characteristics can be obtained, and more excellent attenuation effect can be obtained.

The sound wave phase change device of the present invention changes the size of the cross section of the porous member along its longitudinal direction so as to increase the area where the sound wave of the porous member is incident, thereby reducing the apparent acoustic mass and the acoustic resistance. It is possible to obtain a phase difference characteristic closer to ± 180 degrees and to obtain a better attenuation effect.

In the sound wave phase change device of the present invention, since the sound insulating plate constituting the bottom of the space part is inclined with respect to the horizontal direction, and the porous member is coupled to the lower end, it is possible to prevent it from gathering in the excellent space part when installed outdoors. Can be.

Since the sound wave phase change device of the present invention uses light transmitting material as the material of the porous member and the sound insulating plate assembly, it is possible to prevent the sound wave phase change device from darkening the vicinity of the soundproof panel.

The soundproof wall of the present invention is attached to a porous member made of a soundproof panel and a porous material installed near the sound source and an upper end of the soundproof panel, and is configured by combining a plurality of sound insulation plates, and supports the porous member and the porous member. Since the sound wave phase shifting device has a sound insulating plate assembly having a plurality of independent space parts on the back of the system, the phase of the incident sound wave can be largely displaced, thereby increasing the attenuation effect due to the mutual interference of the sound waves. have.

Claims (3)

A sound insulating plate assembly comprising a porous member made of a porous material and a plurality of sound insulating boards is provided, and supports the porous member and forms a plurality of independent space portions having different volumes in the distribution of the porous member. Sound wave phase change device, characterized in that. The sound wave phase change device according to claim 1, wherein the porous member is made of a porous material which is partially welded with a plurality of plastic particles. A porous member made of a soundproof panel and a porous material installed near the sound source, and attached to the upper end of the soundproof panel and composed of a plurality of sound insulation panels, support the porous member and distribute the porous member. And a sound wave phase change device having a sound insulating plate assembly forming a plurality of independent space portions having different volumes.