CN113685075A - Partition wall construction method and noise reduction method - Google Patents

Partition wall construction method and noise reduction method Download PDF

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Publication number
CN113685075A
CN113685075A CN202110962040.4A CN202110962040A CN113685075A CN 113685075 A CN113685075 A CN 113685075A CN 202110962040 A CN202110962040 A CN 202110962040A CN 113685075 A CN113685075 A CN 113685075A
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CN
China
Prior art keywords
noise
sound
partition wall
noise reduction
wall
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Pending
Application number
CN202110962040.4A
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Chinese (zh)
Inventor
华守春
李荣兵
祝殷宝
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nanjing Guohao Decoration Installation Engineering Co ltd
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Nanjing Guohao Decoration Installation Engineering Co ltd
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Priority to CN202110962040.4A priority Critical patent/CN113685075A/en
Publication of CN113685075A publication Critical patent/CN113685075A/en
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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H17/00—Fencing, e.g. fences, enclosures, corrals
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
    • E04B1/82—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
    • E04B1/84—Sound-absorbing elements
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H17/00—Fencing, e.g. fences, enclosures, corrals
    • E04H17/017—Fencing provided with electric elements or components, e.g. fencing member or component, such as fence strands, post, panel or rail, provided with electric elements or components
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Architecture (AREA)
  • Acoustics & Sound (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Multimedia (AREA)
  • Electromagnetism (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)

Abstract

The invention discloses a construction method of a partition wall and a noise reduction method, which can effectively reduce noise. The construction method of the partition wall comprises the following steps: building a circular inner partition wall around a construction site by taking the construction site as a circle center; building a circular outer partition wall outside the inner partition wall by taking the construction site as a circle center; a first noise reduction system is arranged on the inner wall of the inner partition wall; and a second noise reduction system is arranged on the inner wall of the outer partition wall.

Description

Partition wall construction method and noise reduction method
Technical Field
The invention relates to a partition wall, in particular to a construction method and a noise reduction method of the partition wall.
Background
When building construction, usually enclose the fender to the job site, avoid unnecessary personnel to pass in and out the job site, take place the incident. Existing enclosures are typically walls or fences. This does not effectively isolate the noise at the job site. When the construction work is performed, noise is generated by the operation of the machine. The adverse effects of normal life and work of people around this. For realizing noise reduction, the height of the enclosing wall is increased by the existing construction enterprises, but the noise reduction effect is very limited. And some Chinese patents disclose sound insulation and noise reduction partition walls, such as application No. 201921736606.6 and Chinese patent with the patent name of a noise reduction device for civilized construction in a construction site, and most of the Chinese patents adopt sound insulation and noise reduction plates, so that the structure is complex, and the noise reduction effect is limited. The existing construction method and noise reduction method of the partition wall cannot well solve the problem of construction site noise.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: a partition wall construction method and a noise reduction method are provided, which can effectively reduce noise.
In order to solve the technical problems, the invention adopts the following technical scheme:
in a first aspect, an embodiment of the present invention provides a method for constructing a partition wall, where the method includes:
building a circular inner partition wall around a construction site by taking the construction site as a circle center;
building a circular outer partition wall outside the inner partition wall by taking the construction site as a circle center;
a first noise reduction system is arranged on the inner wall of the inner partition wall;
and a second noise reduction system is arranged on the inner wall of the outer partition wall.
Preferably, the first noise reduction system comprises a first controller and a first noise reduction unit; the first noise reduction unit includes one first sound sensor and an even number of first sound generators,
the first noise reduction system is arranged on the inner wall of the inner partition wall, and comprises:
fixedly connecting a first sound sensor and a first sound generator in a first noise reduction unit to the inner wall of the inner partition wall, wherein the first sound sensor and the first sound generator in the same first noise reduction unit are distributed along the circumferential direction and are positioned on the same horizontal ring;
and respectively connecting the first sound sensor and the first sound generator with a first controller, wherein the first sound generator is symmetrically arranged around the circle center of the horizontal ring.
Preferably, the number of the first noise reduction units is N, where N is an integer greater than 1; the first noise reduction system is arranged on the inner wall of the inner partition wall, and the first noise reduction system further comprises:
and the N first noise reduction units are sequentially arranged on the inner wall of the inner partition wall along the longitudinal direction.
Preferably, the second noise reduction system comprises a second controller and a second noise reduction unit, the second noise reduction unit comprises a second sound sensor and an even number of second sound generators;
lay second noise reduction system on interior partition wall and outer partition wall, include:
fixedly connecting a second sound sensor and a second sounder on the inner wall of the outer partition wall, wherein the second sounder is arranged along the circumferential direction, and the second sounder and the second sound sensor are positioned on the same horizontal ring;
and the second sound sensor and the second sounder are respectively connected with a second controller.
Preferably, the second sounders are symmetrically arranged around the center of the outer partition wall.
Preferably, the height of the inner partition wall is smaller than that of the outer partition wall.
Preferably, the upper inner wall of the outer partition wall is provided with a sound-absorbing plate.
In a second aspect, an embodiment of the present invention further provides a noise reduction method for a partition wall, including:
starting a first noise reduction system and a second noise reduction system;
according to the noise generated at the construction site, the reverse sound wave is generated for the noise of the construction site, and the noise generated at the construction site is weakened.
Preferably, the generating of the reverse sound wave to the noise of the construction site includes:
collecting noise information emitted by a construction site by using a first sound sensor, and transmitting the noise information to a first controller;
the first controller calculates and obtains the sound production information of the first sound generator according to the received noise information; and controlling the first sounder to sound according to the sound information.
Preferably, the generating of the reverse sound wave to the noise of the construction site further comprises:
collecting noise information penetrating through the inner partition wall by using a second sound sensor for noise penetrating through the inner partition wall in the construction site, and transmitting the noise information to a second controller;
the second controller calculates and obtains the sound production information of the second sound generator according to the received noise information; and controlling the second sounder to sound according to the sound production information.
Compared with the prior art, the construction method of the partition wall and the noise reduction method can effectively reduce noise. The construction method of the embodiment comprises the steps of constructing a circular inner partition wall around a construction site by taking the construction site as a circle center; building a circular outer partition wall outside the inner partition wall by taking the construction site as a circle center; a first noise reduction system is arranged on the inner wall of the inner partition wall; and a second noise reduction system is arranged on the inner wall of the outer partition wall. This embodiment can reduce the noise at the construction site through setting up interior partition wall, outer partition wall, first noise reduction system and second noise reduction system.
Drawings
FIG. 1 is a flow chart of a construction method according to an embodiment of the present invention;
fig. 2 is a plan view of a partition wall according to an embodiment of the present invention.
The figure shows that: the sound-reducing system comprises an inner partition wall 1, an outer partition wall 2, a first noise-reducing system 3, a first controller 301, a first sound sensor 302, a first sound generator 303, a second noise-reducing system 4, a second controller 401, a second sound sensor 402, a second sound generator 403 and a construction site 5.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1 and 2, an embodiment of the present invention provides a method for constructing a partition wall, including:
step 10), constructing a circular inner partition wall 1 around the construction site 5 by taking the construction site 5 as a circle center;
step 20) building a circular outer partition wall 2 outside the inner partition wall 1 by taking the construction site 5 as the center of a circle;
step 30) arranging a first noise reduction system on the inner wall of the inner partition wall 1;
and step 40) arranging a second noise reduction system on the inner wall of the outer partition wall 2.
In the construction method of this embodiment, the inner partition wall 1 and the outer partition wall 2 are built around the construction site 5 with the construction site 5 as the center. The inner partition wall 1 and the outer partition wall 2 are both circular. The construction site 5 is located at the centre of the circle. The noise emitted from the construction site 5 reaches the same frequency of the noise at each point on the same horizontal ring on the inner wall of the inner partition wall 1. The noise frequencies of all points which pass through the inner partition wall 1 and reach the same horizontal ring on the inner wall of the outer partition wall 2 are the same. And connecting the first noise reduction system 3 with the inner wall of the inner partition wall 1, and performing noise reduction treatment on noise in the inner partition wall 1. The second noise reduction system 4 is connected to the inner wall of the outer partition wall 2 to reduce noise transmitted between the inner partition wall 1 and the outer partition wall 2. By arranging the inner partition wall 1, the outer partition wall 2, the first noise reduction system 3 and the second noise reduction system 4, the noise at the construction site can be reduced.
Preferably, the first noise reduction system comprises a first controller 301 and a first noise reduction unit. The first noise reduction unit includes one first sound sensor 302 and an even number of first sound generators 303. The first noise reduction system is arranged on the inner wall of the inner partition wall, and comprises:
fixedly connecting a first sound sensor 302 and a first sound generator 303 in a first noise reduction unit to the inner wall of the inner partition wall 1, wherein the first sound sensor 302 and the first sound generator 303 in the same first noise reduction unit are arranged along the circumferential direction and are positioned on the same horizontal ring;
the first sound sensor 302 and the first sound generator 303 are respectively connected with the first controller 301, and the first sound generator 303 is symmetrically arranged around the center of a horizontal circular ring.
When the first noise reduction system 3 is in operation, the first sound sensor 302 collects noise information and transmits the noise information to the first controller 301. The first controller 301 obtains the sound emission information, such as the sound emission frequency, of the first sound emitter 303 through calculation based on the noise information, and controls the first sound emitter 303 to emit sound based on the sound emission information. Since the noise information of each point on the same horizontal plane of the inner wall of the inner partition wall 1 is the same, the noise information, such as the sound frequency, can be collected by arranging the first sound sensor 302. In the same first noise reduction unit, the first acoustic sensor 302 and the first acoustic generator 303 are circumferentially arranged and located on the same horizontal ring. According to the noise frequency collected by the first sound sensor 302, the first controller 301 makes the first sound generators 303 belonging to the same first noise reduction unit emit sounds with the same frequency to the center of the circle. The noise emitted from the construction site 5 is eliminated by the reverse sound of the same frequency. The first acoustic emitters 303 are symmetrically arranged around the center of the horizontal circle. In this way, the unnecessary sound after the noise cancellation of the first sound generator 303 and the construction site 5 is cancelled out by the unnecessary sound after the noise cancellation of the first sound generator 303 and the construction site 5 which are arranged oppositely. This prevents or reduces the sound emitted by the first sound emitter 303 from passing out of the inner partition wall 1, reducing noise.
Preferably, the number of the first noise reduction units is N, where N is an integer greater than 1; the first noise reduction system is arranged on the inner wall of the inner partition wall, and the first noise reduction system further comprises: the N first noise reduction units are sequentially arranged on the inner wall of the inner partition wall 1 along the longitudinal direction. The arrangement of the plurality of first noise reduction units is beneficial to eliminating construction site noise as much as possible in the inner partition wall 1.
Preferably, the second noise reduction system 4 comprises a second controller 401 and a second noise reduction unit comprising one second sound sensor 402 and an even number of second sound generators 403. The second noise reduction system is arranged on the inner partition wall 1 and the outer partition wall 2, and comprises:
fixedly connecting a second sound sensor 402 and a second sounder 403 to the inner wall of the outer partition wall 2, wherein the second sounder 403 is arranged along the circumferential direction, and the second sounder 403 and the second sound sensor 402 are positioned on the same horizontal ring;
the second sound sensor 402 and the second sounder 403 are each connected to the second controller 401.
The construction site noise that cannot be eliminated by the first noise reduction system 3 is eliminated by the second noise reduction system 4. When the construction site 5 noise passes through the inner partition wall 1 and enters between the inner partition wall 1 and the outer partition wall 2, the noise is removed by the second noise reduction system 4. Specifically, the second sound sensor 402 is fixedly attached to the inner wall of the outer partition wall 2. The second sound sensor 402 is used to collect the noise information transmitted from the inner partition wall 1 and transmit the information to the second controller 401. The second controller 401 obtains the sound emission information, such as the sound emission frequency, of the second sound generator 403 through calculation according to the noise information, and controls the second sound generator 403 to emit sound according to the sound emission information. Since the noise frequencies of the points on the same horizontal plane on the inner wall of the outer partition wall 2 are the same, noise information, such as the sound emission frequency, can be collected by providing a second sound sensor 402. In the same second noise reduction unit, the second sounder 403 is fixedly connected to the inner wall of the outer partition wall 1, arranged along the circumferential direction, and located on the same horizontal ring as the second sound sensor 402. According to the frequency of the noise collected by the second sound sensor 402, the second controller 401 causes the second sound generators 403 belonging to the same second noise reduction unit to emit sounds of the same frequency to the construction site 5. The noise coming out of the inner partition wall 1 is eliminated by the reverse sound of the same frequency. In this way, noise between the inner partition wall 1 and the outer partition wall 2 is eliminated by the second noise reduction system 4.
Preferably, the second acoustic generators 403 are symmetrically arranged around the center of the outer partition wall 2. The redundant sound generated after the second sound generator 403 and the noise transmitted from the inner partition wall 1 are offset from the redundant sound generated after the second sound generator 403 and the noise transmitted from the inner partition wall 1 are offset. In this process, the second sound generator 403 and the noise emitted from the inner partition wall 1 counteract the excessive sound, and pass through the inner partition wall 1 through the elimination portion of the inner partition wall 1. The sound emitted by the oppositely arranged second sound generators 403 cancel each other out inside the inner partition wall 1. This prevents or reduces the sound emitted by the second sound generator 403 from being transmitted out of the outer partition wall 2, reducing noise.
Preferably, the height of the inner partition wall 1 is smaller than that of the outer partition wall 2. The height of the outer partition wall 2 is greater than that of the inner partition wall 1, and the part of the outer partition wall 2 which is higher than the inner partition wall can isolate the noise penetrating out of the top of the inner partition wall 1. Preferably, the inner wall of the upper part of the outer partition wall 2 is provided with a sound-absorbing plate. The noise reduction plate can absorb noise. The inner wall of the upper part of the outer partition wall 2 is provided with a sound-absorbing board which absorbs the noise penetrating out from the top of the inner partition wall 1 and reduces the noise to be transmitted out of the outer partition wall 2.
The embodiment of the invention also provides a noise reduction method for the partition wall, which comprises the following steps:
s10, starting the first noise reduction system and the second noise reduction system;
s20, generating a reverse sound wave to the noise of the construction site 5 based on the noise generated at the construction site 5, and attenuating the noise generated at the construction site.
Preferably, the noise generated from the construction site 5 generates a reverse sound wave, including:
collecting noise information emitted by the construction site 5 by using a first sound sensor 302, and transmitting the noise information to a first controller 301;
the first controller 301 calculates and obtains the sound production information of the first sound producer 303 according to the received noise information; and controls the first speaker 303 to emit a sound according to the sound emission information.
In this preferred embodiment, the noise emitted from the construction site 5 is eliminated by the first noise reduction system.
Preferably, the generating of the reverse sound wave to the noise of the construction site 5 further includes:
for the noise penetrating through the inner partition wall 1 in the construction site, collecting the noise information penetrating through the inner partition wall 1 by using a second sound sensor 402, and transmitting the noise information to a second controller 401;
the second controller 401 calculates and obtains the sound production information of the second sound generator 403 according to the received noise information; and controls the second sounder 403 to sound according to the sound emission information.
In this preferred embodiment, the noise emitted from the construction site 5 is eliminated by the second noise reduction system. Noise that sends to construction site 5 through first noise reduction system and second noise reduction system carries out the secondary and eliminates, and 5 noises of reduction construction site that can be very big spread to the outer side of outer partition wall 2.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are intended to further illustrate the principles of the invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention, which is also intended to be covered by the appended claims. The scope of the invention is defined by the claims and their equivalents.

Claims (10)

1. A method of constructing a partition, the method comprising:
building a circular inner partition wall (1) around the construction site (5) by taking the construction site (5) as a circle center;
building a circular outer partition wall (2) outside the inner partition wall (1) by taking the construction site (5) as the center of a circle;
a first noise reduction system is arranged on the inner wall of the inner partition wall (1);
and a second noise reduction system is arranged on the inner wall of the outer partition wall (2).
2. A method of constructing a partition according to claim 1 wherein the first noise reducing system comprises a first controller (301) and a first noise reducing unit; the first noise reduction unit includes one first sound sensor (302) and an even number of first sound generators (303),
the first noise reduction system is arranged on the inner wall of the inner partition wall, and comprises:
fixedly connecting a first sound sensor (302) and a first sound generator (303) in a first noise reduction unit to the inner wall of an inner partition wall (1), wherein the first sound sensor (302) and the first sound generator (303) in the same first noise reduction unit are arranged along the circumferential direction and are positioned on the same horizontal ring;
and respectively connecting the first sound sensor (302) and the first sound generator (303) with a first controller (301), wherein the first sound generator (303) is symmetrically arranged around the center of a horizontal circular ring.
3. The method of constructing a partition wall according to claim 2, wherein the number of the first noise reduction units is N, N being an integer greater than 1; the first noise reduction system is arranged on the inner wall of the inner partition wall, and the first noise reduction system further comprises:
the N first noise reduction units are sequentially arranged on the inner wall of the inner partition wall (1) along the longitudinal direction.
4. A method of constructing a partition according to claim 1 wherein the second noise reducing system (4) comprises a second controller (401) and a second noise reducing unit comprising a second sound sensor (402) and an even number of second sound generators (403);
the second noise reduction system is arranged on the inner partition wall (1) and the outer partition wall (2) and comprises the following components:
fixedly connecting a second sound sensor (402) and a second sounder (403) on the inner wall of the outer partition wall (2), wherein the second sounder (403) is arranged along the circumferential direction, and the second sounder (403) and the second sound sensor (402) are positioned on the same horizontal ring;
the second sound sensor (402) and the second sounder (403) are each connected to a second controller (401).
5. A method of constructing a partition according to claim 4 wherein the second sound generators (403) are arranged symmetrically around the centre of the outer partition (2).
6. A method of constructing a partition according to claim 1 wherein the height of the inner partition (1) is less than the height of the outer partition (2).
7. A method of constructing a partition according to claim 6 wherein the upper interior wall of the outer partition (2) is provided with a sound deadening panel.
8. A method of reducing noise in a partition, comprising:
starting a first noise reduction system and a second noise reduction system;
according to the noise generated by the construction site (5), the reverse sound wave is generated to the noise of the construction site (5), and the noise generated by the construction site is weakened.
9. A method of reducing noise in a partition wall according to claim 8, wherein the generating of the reverse sound wave to the noise of the construction site (5) comprises:
collecting noise information emitted by a construction site (5) by using a first sound sensor (302) and transmitting the noise information to a first controller (301);
the first controller (301) calculates and obtains the sound production information of the first sound generator (303) according to the received noise information; and controls the first sound generator (303) to generate sound according to the sound generation information.
10. A method of reducing noise in a partition wall according to claim 8, wherein the generating of the reverse sound wave to the noise of the construction site (5) further comprises:
collecting noise information penetrating through the inner partition wall (1) of a construction site by using a second sound sensor (402), and transmitting the noise information to a second controller (401);
the second controller (401) calculates and obtains sound production information of the second sound generator (403) according to the received noise information; and controls the second sounder (403) to sound according to the sound production information.
CN202110962040.4A 2021-08-20 2021-08-20 Partition wall construction method and noise reduction method Pending CN113685075A (en)

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Application Number Priority Date Filing Date Title
CN202110962040.4A CN113685075A (en) 2021-08-20 2021-08-20 Partition wall construction method and noise reduction method

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Application Number Priority Date Filing Date Title
CN202110962040.4A CN113685075A (en) 2021-08-20 2021-08-20 Partition wall construction method and noise reduction method

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04500A (en) * 1989-08-26 1992-01-06 Kyoji Fujiwara Active control type soundproofing device
CN102242575A (en) * 2011-04-22 2011-11-16 有利华建筑预制件有限公司 Noise-reducing dust-reducing partition system for construction site as well as assembling and use method thereof
CN105840462A (en) * 2016-05-23 2016-08-10 苏州艾柏特精密机械有限公司 Active noise-eliminating and noise-reducing system of compressor
CN106836539A (en) * 2017-01-23 2017-06-13 杭州交联电力设计股份有限公司 Transformer station's noise reduction system
CN206655340U (en) * 2017-04-07 2017-11-21 中铁电气化局集团北京建筑工程有限公司 A kind of noise reducing device of railway station building
US20180137850A1 (en) * 2016-11-17 2018-05-17 Sound Fighter Systems, Llc Sound barrier panel and system

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04500A (en) * 1989-08-26 1992-01-06 Kyoji Fujiwara Active control type soundproofing device
CN102242575A (en) * 2011-04-22 2011-11-16 有利华建筑预制件有限公司 Noise-reducing dust-reducing partition system for construction site as well as assembling and use method thereof
CN105840462A (en) * 2016-05-23 2016-08-10 苏州艾柏特精密机械有限公司 Active noise-eliminating and noise-reducing system of compressor
US20180137850A1 (en) * 2016-11-17 2018-05-17 Sound Fighter Systems, Llc Sound barrier panel and system
CN106836539A (en) * 2017-01-23 2017-06-13 杭州交联电力设计股份有限公司 Transformer station's noise reduction system
CN206655340U (en) * 2017-04-07 2017-11-21 中铁电气化局集团北京建筑工程有限公司 A kind of noise reducing device of railway station building

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Application publication date: 20211123