CN110820614B - Acoustic attenuation plate simulating leaves, viaduct noise reduction device and control method - Google Patents
Acoustic attenuation plate simulating leaves, viaduct noise reduction device and control method Download PDFInfo
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- CN110820614B CN110820614B CN201911139076.1A CN201911139076A CN110820614B CN 110820614 B CN110820614 B CN 110820614B CN 201911139076 A CN201911139076 A CN 201911139076A CN 110820614 B CN110820614 B CN 110820614B
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F8/00—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic
- E01F8/0005—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic used in a wall type arrangement
- E01F8/0017—Plate-like elements
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F8/00—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic
- E01F8/0005—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic used in a wall type arrangement
- E01F8/0029—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic used in a wall type arrangement with porous surfaces, e.g. concrete with porous fillers
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F8/00—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic
- E01F8/0005—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic used in a wall type arrangement
- E01F8/0047—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic used in a wall type arrangement with open cavities, e.g. for covering sunken roads
- E01F8/0064—Perforated plate or mesh, e.g. as wall facing
- E01F8/007—Perforated plate or mesh, e.g. as wall facing with damping material
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Abstract
The invention discloses a sound wave attenuation plate simulating leaves, a viaduct noise reduction device and a control method, wherein the sound wave attenuation plate is formed by mutually hinging attenuation blocks, each attenuation block is formed by connecting a first edge, a second edge and a third edge end to end, a magnetic pole is fixed in the middle of each attenuation block, a triangular hollow area is formed in each attenuation block, the edge of each triangular hollow area is in a sawtooth shape, a hinge point is fixed at the joint of the first edge, the second edge and the third edge, the attenuation blocks are hinged through the hinge points, the magnetic poles contain aluminum-iron-boron, and the proportion of the aluminum-iron-boron in the magnetic pole in each attenuation block is different, namely the magnetic strength is different. The size of the magnetic field of the electromagnetic conversion device is controlled by the sensor unit and the control unit, so that an active conversion structure according to the level of environmental noise can be realized, and the sound absorption and insulation efficiency is improved.
Description
Technical Field
The invention relates to the field of noise control, in particular to a sound wave attenuation plate simulating leaves, a viaduct noise reduction device and a control method.
Background
With the increasing year by year of the automobile holding capacity in China, in places with more automobile throughput, such as viaducts and the like, noise generated by vehicles has great influence on surrounding residents, such as influencing the rest and sleep of nearby residents, and easily causing dysphoria and the like, so that the noise control at the viaducts is always an urgent problem to be solved.
The noise barrier of the type of falling L is generally installed in road both sides in the aspect of the prevention and cure of overpass noise at present stage, adopts porous material from top to bottom at the noise barrier, and the centre makes the device become more pleasing to the eye for toughened glass, simultaneously because the characteristics that toughened glass density is big possess certain syllable-dividing function, but lead to absorbing sound noise cancelling effect poor like this, concentrate on the noise barrier middle part mostly through the reflected noise, have very big influence to the driver in the car. To this chinese patent CN110219258A, an inverted L-shaped sound-proof screen is proposed, which comprises an inner sound-proof board, a middle sound-absorbing layer and an outer sound-proof board, and the inner and outer sound-proof boards are provided with sound-absorbing grooves and sound-absorbing holes, and a sound-absorbing material is filled between the sound-proof boards and the sound-absorbing layer, so as to reduce the influence of noise reflection on the driver and improve the safety. However, in the present invention, the sound insulation plate is used inside the overpass, and although the sound absorption grooves are formed on the upper surface, the sound absorption efficiency is low, and the reflection of sound waves can be reduced only to a certain extent, and the improvement of the driving safety of the driver is not high.
Chinese patent CN108360404A proposes an urban rail transit viaduct sound insulation barrier, which is characterized in that sound attenuation holes and sound attenuation folding surfaces are arranged on sound attenuation boards, a cavity formed between the sound attenuation boards is provided with multi-level sound attenuation belts such as sound attenuation sponge, etc. to reduce noise, and the sound absorption and sound attenuation effects are achieved to a certain extent, but the sound absorption and reflection effects can only be passive, and the sound attenuation efficiency is difficult to guarantee when the noise level is high.
"Eylirigig Carl F.. Jungle optics [ J ]. Journal of the Aeous-physical Society of America, 1946, 18 (2); 257-270 "indicates the proportion of the leaf to the sound, such as reflection, transmission and absorption, depending on the initial angle of sound transmission to the leaf and the density of the leaf; "Reethof G.. Effect of places on radiation of high way noise [ J ]. Air Point Control Association Journal, 1973, 23 (3): 185-189 "shows that the trunk approximates a cylinder, and sound is attenuated by reflection and diffraction as it passes perpendicularly through the tree; rough barks and dense leaves can absorb a large amount of sound; the idea in "yao cheng, xu shihong, wang, for example" design and application of noise reduction green belt on shanghai section of shanghai highway [ M ]. academic corpus of fourth annual meeting of shanghai city highway academic society, 1998, 25-28 "is that reflection and diffraction of sound wave on the surface of leaves and branches causes noise attenuation; "a.bematzky (federal germany) treaty. self-renewal, wai's interpretation, tree ecology and conservation [ M ]. beijing: china architecture industry publishers, 1987: 60.115-118 ", it has been found that in order to achieve the desired noise reduction, the leaves of trees are as large as possible, and have a rigid structure, and that most evergreen broad-leaved trees grown in temperate zones generally have a better noise reduction due to their characteristic broad and rigid leaves. All studies in this area show that whether forests, artificial forests or various greening forms in cities attenuate noise, and especially that high-frequency noise which is sensitive to human beings has more obvious attenuation effect, the national forest reception survey of public benefits of forests, green benefits survey (1972), Yang Huimen translation [ J ]. foreign forestry science and technology, 1982, 11: 39' in 1972, the research result shows that the highest attenuation value of the conifer forest with the width of 3-30 m to noise is 7.0-14.2 dB.
Disclosure of Invention
The sound wave attenuation plate simulating the leaves, the viaduct noise reduction device and the control method are provided for solving the defects of the prior art.
In order to realize the purpose, the following technical scheme is provided:
the sound wave attenuation board of bionical leaf comprises the attenuation piece is articulated each other, the attenuation piece is formed by first limit, second limit and third limit end to end connection, the attenuation piece middle part is fixed with the magnetic pole, and the attenuation piece opens there is triangle-shaped fretwork district, triangle-shaped fretwork district edge is the zigzag, first limit, second limit and the third limit department of meeting are fixed with the pin joint, articulate through the pin joint between the attenuation piece, contain ferro-aluminum boron among the magnetic pole, the shared proportion difference of ferro-aluminum boron is the magnetism intensity difference in the magnetic pole in every attenuation piece.
The viaduct noise reduction device comprises a sound absorption layer, a metal sound insulation layer, a sound wave attenuation plate, an electromagnetic conversion device, a control unit, a sensor unit and a power supply unit, wherein the sound absorption layer, the metal sound insulation layer, a top plate, a bottom plate and side plates form a noise processing cavity, the sound wave attenuation plate and the electromagnetic conversion device are arranged in the noise processing cavity, the electromagnetic conversion device is fixed on the metal sound insulation layer, the sound wave attenuation plate is arranged on the side plates through sliding limiting seats distributed at four top corners, each sliding limiting seat comprises a seat body with a limiting platform and a rolling pin, one end of the rolling pin is connected with a hinge joint of an attenuation block through a pin shaft, the other end of the rolling pin is in contact with the inner wall of the seat body through balls, the control unit is arranged at the lower part of the bottom plate and fixed on a mounting plate, the sensor unit comprises a sound, the power supply unit supplies power for the control unit, the sensor unit and the electromagnetic conversion device, the sensor unit is connected with the control unit, and the control unit is connected with the electromagnetic conversion device.
Preferably, the sensor unit further comprises a light intensity sensor, a solar panel is fixed on the outer side of the metal sound insulation layer and connected with the light intensity sensor, the solar panel supplies power to the control unit, the sensor unit and the electromagnetic conversion device in preference to the power supply unit, the power supply unit is connected with the light intensity sensor and comprises an equipment power supply and a micro battery.
The control method of the viaduct noise reduction device comprises the following steps:
s1: the sound sensor detects the sound decibel in the environment, when the sound decibel is below 50dB, the electromagnetic conversion device does not work, when the sound decibel is greater than or equal to 50dB, the control unit starts the electromagnetic conversion device, and the control unit controls the size of the output current according to the sound decibel obtained by the sound sensor;
s2: the electromagnetic conversion device outputs a corresponding magnetic field according to the received current, and due to the action of the magnetic field, the attenuation blocks in the acoustic attenuation plate rotate around the hinge point, and the proportion of aluminum, iron and boron used for the magnetic poles in the attenuation plate is different, so that the rotation angle of each attenuation block is different, and the relative rotation speed is also different;
s3: the sound waves are subjected to primary absorption and reflection through the sound absorption layer and then enter the sound wave attenuation plate, the sound waves are reduced due to the swing state of the attenuation blocks like leaves, meanwhile, each attenuation block is internally provided with a hollow area with a sawtooth edge, and the sound waves are repeatedly reflected in the hollow area to be reduced;
s4: the sound sensor detects the sound decibel in the environment in real time, and when the sound is detected to be continuously increased, the control unit increases the output current, so that the magnetic field of the electromagnetic conversion device is increased, and the rotating angle and the rotating speed of the attenuation block are increased;
s5: the sound sensor detects the sound decibel in the environment in real time, and when the sound is detected to be reduced, the control unit reduces the output current, so that the magnetic field of the electromagnetic conversion device is reduced, and the rotating angle and the rotating speed of the attenuation block are reduced;
s6: the reduced sound waves enter the metal sound insulation layer, and are finally absorbed and reflected by the metal sound insulation layer, so that the sound waves are reduced to below 50 dB;
s7: when the sound is lower than 50dB, the control unit does not output current, and the electromagnetic conversion device stops working.
Has the advantages that:
1. the sound wave attenuation plate simulates leaves by adopting a triangle formed by connecting three sides end to end, and the attenuation block swings to simulate the leaves by utilizing the electromagnetic conversion device so as to reduce noise by reflecting the sound wave.
2. The sound absorption layer is made of polyurethane foam plastic, noise generated on the viaduct is guided to the rear noise processing part through the tiny hole units on the material, the metal sound insulation layer is made of solid galvanized steel plates, a small amount of sound waves which are not completely dissipated in the middle are reflected by the high-density structure of the steel plates, the left sound waves and the right sound waves are isolated, and a quiet environment is provided for residents behind the device.
3. The size of the magnetic field of the electromagnetic conversion device is controlled by the sensor unit and the control unit, so that an active conversion structure according to the level of environmental noise can be realized, and the sound absorption and insulation efficiency is improved.
Drawings
FIG. 1 is a schematic diagram of an attenuator block structure;
FIG. 2 is a schematic view of a sound wave attenuation panel for bionic leaves;
fig. 3 is a schematic view of the overall structure of the noise reduction device for the viaduct;
fig. 4 is a cross-sectional view of the noise reducing device for the viaduct;
FIG. 5 is a block diagram of the connection relationship of the noise reducing device for the viaduct;
fig. 6 is a flowchart of a control method of the viaduct noise reduction device;
FIG. 7 is a schematic diagram of the motion of the acoustic attenuation panel with increased current;
FIG. 8 is a schematic view of the motion of the acoustic attenuation panel with reduced current;
FIG. 9 is a schematic view of the acoustic attenuation panel installation;
fig. 10 is a schematic view of the sliding position-limiting seat.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In addition, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The sound wave attenuation plate of the bionic tree leaf shown in fig. 1 and fig. 2 is formed by mutually hinging attenuation blocks 300, wherein each attenuation block 300 is formed by connecting a first edge 30, a second edge 31 and a third edge 32 end to end, a magnetic pole 34 is fixed in the middle of each attenuation block 300, a triangular hollow area 33 is formed in each attenuation block 300, the edge of each triangular hollow area is in a sawtooth shape 36, a hinge point 35 is fixed at the joint of the first edge 30, the second edge 31 and the third edge 32, the attenuation blocks 300 are hinged through the hinge point 35, the magnetic pole 34 contains aluminum-iron-boron, and the proportion of the aluminum-iron-boron in the magnetic pole 34 in each attenuation block 300 is different, namely the magnetic strength is different.
The viaduct noise reduction device shown in fig. 3 and 4 comprises a sound absorption layer 11, a metal sound insulation layer 16, a sound wave attenuation plate 12, an electromagnetic conversion device 15, a control unit 14, a sensor unit 10 and a power supply unit 102, wherein the sound absorption layer 11, the metal sound insulation layer 16, a top plate 19, a bottom plate 18 and a side plate 22 form a noise processing cavity 13, the sound wave attenuation plate 12 and the electromagnetic conversion device 15 are arranged in the noise processing cavity 13, the electromagnetic conversion device 15 is fixed on the metal sound insulation layer 16, the sound wave attenuation plate 12 shown in fig. 9 and 10 is arranged on the side plate 22 through sliding limiting seats 100 distributed at four top corners, the sliding limiting seat 100 comprises a seat body 203 with a limiting platform 201 and rolling pins 202, one end of each rolling pin 202 is connected with a hinge point 35 of an attenuation block 300 through a pin shaft, and the other end of each rolling pin 202 is in contact with the inner wall of the seat body 203 through a, the control unit 14 is disposed at the lower portion of the bottom plate 18 and fixed on the mounting plate 101, as shown in fig. 5, the sensor unit 10 includes a sound sensor, the sensor unit 10 is fixed outside the overpass noise reduction device, the power supply unit 102 supplies power to the control unit 14, the sensor unit 10 and the electromagnetic conversion device 15, the sensor unit 10 is connected with the control unit 14, and the control unit 14 is connected with the electromagnetic conversion device 15.
The sensor unit 10 further comprises a light intensity sensor, a solar cell panel 17 is fixed on the outer side of the metal sound insulation layer 16, and a flexible thin film solar cell is adopted, so that the sensor unit is light in weight and convenient to install. The solar panel 17 is connected with the light intensity sensor, and supplies power to the control unit 14, the sensor unit 10 and the electromagnetic conversion device 15 in preference to the power supply unit 102, the power supply unit 102 is connected with the light intensity sensor, and the power supply unit 102 comprises an equipment power supply 104 and a micro battery 103.
When the light intensity sensor of the sensor unit 10 detects that the light of the environment reaches the preset intensity, the solar panel 17 starts to work, converts the light energy into the electric energy to directly supply to the control unit 14, the sensor unit 10 and the electromagnetic conversion device 15, and supplements the electric quantity of the prepared power supply and the micro battery with the redundant electric energy. When the light intensity sensor detects that the conversion of the ambient light intensity by the solar panel 17 is insufficient to provide sufficient power to the individual cells, the solar panel 17 and the micro battery operate simultaneously. When the solar cell completely loses function at night, the micro battery is responsible for providing electric energy for the whole device. In order to prevent the conditions of overcast and rainy days and insufficient illumination in multiple days, the device is also provided with a prepared power supply, thereby increasing the cruising ability of the whole system.
The sound absorption layer 11 is made of polyurethane foam plastic, noise generated on the viaduct is guided to a rear noise processing part through tiny hole units on the material, the metal sound insulation layer 16 is made of solid galvanized steel plates, a small amount of sound waves which are not completely dissipated in the middle are reflected by utilizing a high-density structure of the steel plates, left and right sound waves are isolated, and a quiet environment is provided for residents behind the device. The top plate 19, the bottom plate 18 and the side plates 22 are made of solid galvanized steel plates.
As shown in fig. 6, the method for controlling the noise reduction device for the viaduct bridge includes the following steps:
s1: the sound sensor detects the sound decibel in the environment, when the sound decibel is below 50dB, the electromagnetic conversion device does not work, when the sound decibel is greater than or equal to 50dB, the control unit starts the electromagnetic conversion device, and the control unit controls the size of the output current according to the sound decibel obtained by the sound sensor;
s2: the electromagnetic conversion device outputs a corresponding magnetic field according to the received current, and due to the action of the magnetic field, the attenuation blocks in the acoustic attenuation plate rotate around the hinge point, and the proportion of aluminum, iron and boron used for the magnetic poles in the attenuation plate is different, so that the rotation angle of each attenuation block is different, and the relative rotation speed is also different;
s3: the sound waves are subjected to primary absorption and reflection through the sound absorption layer and then enter the sound wave attenuation plate, the sound waves are reduced due to the swing state of the attenuation blocks like leaves, meanwhile, each attenuation block is internally provided with a hollow area with a sawtooth edge, and the sound waves are repeatedly reflected in the hollow area to be reduced;
s4: the sound sensor detects the sound decibel in the environment in real time, when the sound is detected to be continuously increased, the control unit increases the output current, and further increases the magnetic field of the electromagnetic conversion device, so that the rotation angle and the rotation speed of the attenuation block are increased as shown in fig. 7;
s5: the sound sensor detects the sound decibel in the environment in real time, when the sound is detected to be reduced, the control unit reduces the output current, and further reduces the magnetic field of the electromagnetic conversion device, so that the rotation angle and the rotation speed of the attenuation block are reduced as shown in fig. 8;
s6: the reduced sound waves enter the metal sound insulation layer, and are finally absorbed and reflected by the metal sound insulation layer, so that the sound waves are reduced to below 50 dB;
s7: when the sound is lower than 50dB, the control unit does not output current, and the electromagnetic conversion device stops working.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (5)
1. The sound wave attenuation board of bionical leaf, its characterized in that articulates each other by the decay piece and forms, the decay piece is formed by first limit, second limit and third limit end to end connection, decay piece middle part is fixed with the magnetic pole, and the decay piece opens there is triangle-shaped fretwork district, triangle-shaped fretwork district edge is the zigzag, first limit, second limit and the third limit department of meeting are fixed with the pin joint, articulate through the pin joint between the decay piece, contain ferro-aluminum boron in the magnetic pole, the shared proportion difference of ferro-aluminum boron is the magnetism intensity difference in the magnetic pole in every decay piece.
2. The viaduct noise reduction device of the sound wave attenuation plate of the bionic tree leaves according to claim 1, which comprises a sound absorption layer, a metal sound insulation layer, a sound wave attenuation plate, an electromagnetic conversion device, a control unit, a sensor unit and a power supply unit, wherein the sound absorption layer, the metal sound insulation layer, a top plate, a bottom plate and side plates form a noise processing cavity, the noise processing cavity is internally provided with the sound wave attenuation plate and the electromagnetic conversion device, the electromagnetic conversion device is fixed on the metal sound insulation layer, the sound wave attenuation plate is arranged on the side plates through sliding limit seats distributed at four apex angles, each sliding limit seat comprises a seat body with a limit platform and a rolling pin, one end of the rolling pin is connected with a hinge point of an attenuation block through a pin shaft, the other end of the rolling pin is in contact with the inner wall of the seat body through balls, the control unit is arranged at the lower, the sensor unit comprises a sound sensor, the sensor unit is fixed outside the viaduct noise reduction device, the power supply unit supplies power to the control unit, the sensor unit and the electromagnetic conversion device, the sensor unit is connected with the control unit, and the control unit is connected with the electromagnetic conversion device.
3. The overpass noise reduction apparatus of claim 2, wherein the sensor unit further comprises a light intensity sensor, a solar panel is fixed on the outer side of the metal soundproof layer, the solar panel is connected with the light intensity sensor, and supplies power to the control unit, the sensor unit and the electromagnetic conversion device in preference to a power supply unit, the power supply unit is connected with the light intensity sensor, and the power supply unit comprises an equipment power supply and a micro battery.
4. The overpass noise reduction device of claim 2, wherein the sound absorbing layer is made of polyurethane foam, the metal sound insulating layer is made of solid galvanized steel plate, and the top plate, the bottom plate and the side plates are made of solid galvanized steel plate.
5. The method for controlling the overpass noise reduction device of any one of claims 2-4, comprising the steps of:
s1: the sound sensor detects the sound decibel in the environment, when the sound decibel is below 50dB, the electromagnetic conversion device does not work, when the sound decibel is greater than or equal to 50dB, the control unit starts the electromagnetic conversion device, and the control unit controls the size of the output current according to the sound decibel obtained by the sound sensor;
s2: the electromagnetic conversion device outputs a corresponding magnetic field according to the received current, the attenuation blocks in the acoustic wave attenuation plate rotate around the hinge point under the action of the magnetic field, and the rotation angle and the rotation speed of each attenuation block are different due to different proportions of aluminum, iron and boron of the magnetic poles in the attenuation plate;
s3: the sound waves are subjected to primary absorption and reflection through the sound absorption layer and then enter the sound wave attenuation plate, the sound waves are reduced due to the swing state of the attenuation blocks like leaves, meanwhile, each attenuation block is internally provided with a hollow area with a sawtooth edge, and the sound waves are repeatedly reflected in the hollow area to be reduced;
s4: the sound sensor detects the sound decibel in the environment in real time, and when the sound is detected to be continuously increased, the control unit increases the output current, so that the magnetic field of the electromagnetic conversion device is increased, and the rotating angle and the rotating speed of the attenuation block are increased;
s5: the sound sensor detects the sound decibel in the environment in real time, and when the sound is detected to be reduced, the control unit reduces the output current, so that the magnetic field of the electromagnetic conversion device is reduced, and the rotating angle and the rotating speed of the attenuation block are reduced;
s6: the reduced sound waves enter the metal sound insulation layer, and are finally absorbed and reflected by the metal sound insulation layer, so that the sound waves are reduced to below 50 dB;
s7: when the sound is lower than 50dB, the control unit does not output current, and the electromagnetic conversion device stops working.
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| KR100770379B1 (en) * | 2005-11-14 | 2007-10-25 | 주식회사 무한건설 | Rotation type soundproof wall by opening force control system and elastic restoration |
| CN201265144Y (en) * | 2008-09-08 | 2009-07-01 | 边振海 | Shoulder hole structure acoustic panel |
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