CN110838282B - Composite sound absorption device and method for drying air duct of washing machine and washing machine - Google Patents
Composite sound absorption device and method for drying air duct of washing machine and washing machine Download PDFInfo
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- CN110838282B CN110838282B CN201911150764.8A CN201911150764A CN110838282B CN 110838282 B CN110838282 B CN 110838282B CN 201911150764 A CN201911150764 A CN 201911150764A CN 110838282 B CN110838282 B CN 110838282B
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- 238000010521 absorption reaction Methods 0.000 title claims abstract description 108
- 238000001035 drying Methods 0.000 title claims abstract description 53
- 239000002131 composite material Substances 0.000 title claims abstract description 39
- 238000005406 washing Methods 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims description 11
- 230000030279 gene silencing Effects 0.000 claims abstract description 5
- 238000011144 upstream manufacturing Methods 0.000 claims description 4
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- 238000005516 engineering process Methods 0.000 description 10
- 230000008859 change Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
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- 238000013459 approach Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
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- 238000003379 elimination reaction Methods 0.000 description 1
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- 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
- G10K11/1785—Methods, e.g. algorithms; Devices
- G10K11/17861—Methods, e.g. algorithms; Devices using additional means for damping sound, e.g. using sound absorbing panels
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- 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
- G10K11/1787—General system configurations
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- 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
- G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
- G10K2210/10—Applications
- G10K2210/105—Appliances, e.g. washing machines or dishwashers
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- 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
- G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
- G10K2210/30—Means
- G10K2210/321—Physical
- G10K2210/3229—Transducers
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- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Control Of Washing Machine And Dryer (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Main Body Construction Of Washing Machines And Laundry Dryers (AREA)
Abstract
The invention provides a composite sound absorption device for a drying air duct of a washing machine, which comprises: the passive sound absorption structure is used for passively absorbing noise in the drying air channel and comprises a cavity formed by outward bulges on the side wall of the drying air channel and a micro-perforated plate covering the opening of the cavity; the active sound absorption structure is used for actively silencing noise after sound absorption through the passive sound absorption structure, and comprises a controller, a loudspeaker, a first sound sensor and a second sound sensor, wherein the loudspeaker is arranged at the top of a cavity of the cavity, the first sound sensor is arranged before the cavity, the second sound sensor is arranged on the side wall of the cavity, the controller is used for controlling the loudspeaker to generate secondary sound field balance channel according to a first electric signal measured by the first sound sensor and a second electric signal measured by the second sound sensor.
Description
Technical Field
The invention relates to a noise reduction technology of an air duct of a washing machine, in particular to a composite sound absorption device and a composite sound absorption method of a drying air duct of the washing machine and the washing machine.
Background
With the continuous development of washing machine technology, the current washing machine has more and more functions. The problems of noise, vibration and the like also come with the convenience of users. For example, when the washing machine enters a drying stage after completing a dehydration process, the drum is in a low rotation speed state, and noise generated by the drying system is a main noise source of the whole machine.
At present, the most main way to reduce the noise of the air duct is to adopt an impedance composite type noise elimination structure, which is formed by combining an anti-type structure such as an expansion chamber and a resonant cavity with a porous sound absorption material, and can realize the noise control in a wider frequency band. However, due to the inherent defects of the passive control technology, the low-frequency control performance of the passive control technology has obvious limitations, which are mainly reflected in the aspects of narrow control frequency band, unadjustable control frequency, large volume and weight and the like.
In recent years, researchers have gradually studied active noise reduction technologies, and the active noise reduction technologies are widely applied to ventilation ducts of vehicles, aerospace and the like, and can better realize low-frequency-band sound absorption. If the traditional sound absorption structure is combined with the active noise reduction technology, the noise control of the whole frequency band can be realized, and the noise reduction device has great significance on the noise reduction measures of the drying air duct of the washing machine.
Disclosure of Invention
In view of the above, the present invention provides a composite sound absorption device and a composite sound absorption method for a drying air duct of a washing machine, and the washing machine, to solve the above problems, specifically:
the invention provides a composite sound absorption device for a drying air duct of a washing machine, which comprises: at least one group of active sound absorption structure and passive sound absorption structure which are correspondingly arranged,
the passive sound absorption structure is used for passively absorbing noise in the drying air duct and comprises a cavity formed by protruding outwards on the side wall of the drying air duct and a micro-perforated plate covering the opening of the cavity;
the active sound absorption structure is used for actively silencing the noise absorbed by the passive sound absorption structure and comprises a controller, a loudspeaker, a first sound sensor and a second sound sensor,
the loudspeaker is arranged at the top of the cavity, the first sound sensor is arranged in front of the cavity, the second sound sensor is arranged on the side wall of the cavity, and the controller controls the loudspeaker to generate secondary sound field balance passing through the sound pressure of the noise behind the micro-perforated plate according to a first electric signal measured by the first sound sensor and a second electric signal measured by the second sound sensor.
Preferably, the second acoustic sensor is disposed at the center of the cavity side wall.
Preferably, the composite sound absorption device comprises N groups of correspondingly arranged active sound absorption structures and passive sound absorption structures which are sequentially connected,
in the N active sound absorption structures, except that the first sound sensor and the second sound sensor are arranged in the first group of active sound absorption structures, the active sound absorption structures in other groups are only provided with the second sound sensor, and N is a positive integer larger than 1.
Preferably, the N sets of correspondingly arranged active sound absorption structures and passive sound absorption structures are arranged along the wind channel direction.
Preferably, the controller modifies the corresponding speaker according to the second sound sensor in the nth active sound absorbing structure, where N e N.
Preferably, the micro-perforated plate is provided with a plurality of through holes, wherein the thickness of the micro-perforated plate is less than or equal to 1mm, the aperture of each through hole is less than or equal to 1mm, and the perforation rate is 4-6%.
Preferably, the cavity is a rectangular protruding structure arranged on the upper side wall surface of the drying air duct, the long edge of the rectangular protruding structure is consistent with the trend of the air supply air duct, and the protruding height is 3cm-4 cm.
The invention provides a composite sound absorption method for a drying air duct of a washing machine, which uses the composite sound absorption device to perform sound attenuation.
Preferably, the first and second electrodes are formed of a metal,
arranging the composite sound absorption device on the side wall of the air duct;
detecting the sound at the upstream of the air duct by using a first sound sensor, converting the sound into a first electric signal and sending the first electric signal to a controller;
detecting sound absorbed by the first passive sound absorption structure by using a second sound sensor, converting the sound into a second point signal and sending the second point signal to the controller;
the controller controls the active sound absorption structure to generate a secondary sound field for balancing noise according to the first electric signal so as to perform active sound absorption, and adjusts the active sound absorption structure according to the second electric signal.
The invention provides a washing machine, which comprises a fan, a drying cylinder and a drying air duct, wherein the fan and the drying cylinder are connected through the drying air duct, and the drying air duct adopts the composite sound absorption device.
Has the advantages that: according to the invention, the active and passive composite sound absorption structure is arranged in the air duct, so that the noise reduction of a low frequency band and a medium and high frequency band can be realized simultaneously, and the problems of airflow pulsation noise and high motor noise in the pipeline are effectively solved.
Drawings
The above and other objects, features and advantages of the present disclosure will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings. The drawings described below are merely some embodiments of the present disclosure, and other drawings may be derived from those drawings by those of ordinary skill in the art without inventive effort.
FIG. 1 is a schematic view of an active and passive composite sound absorption installation according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of an active and passive composite sound absorbing structure according to an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating the principle of active and passive composite noise reduction according to an embodiment of the present invention.
In the figure: 1-a first loudspeaker; 2-a second speaker; 3-a first sound sensor; 4-a microperforated plate; 5-a second sound sensor; 6-second sound transducer.
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 some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, and "a" and "an" generally include at least two, but do not exclude at least one, unless the context clearly dictates otherwise.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a commodity or system that includes the element.
In the drying process of the washing machine, the noise of a fan motor and the air flow pulsation noise of an air duct are main noise sources of the whole machine, the technical scheme of the invention starts the structural optimization of the drying air duct, combines the traditional sound absorption structure with the active noise reduction technology and applies the traditional sound absorption structure and the active noise reduction technology to the noise reduction of the air duct, and reduces the noise of the motor and the air flow from a transmission path, thereby improving the sound insulation and noise reduction level of the whole machine.
The active and passive composite sound absorption device for the drying air duct is designed near an air outlet of the air duct and comprises a passive sound absorption structure and an active sound absorption system.
The passive sound absorption structure is a cavity structure and is matched with a novel sound absorption material, namely a micropunch plate, and the passive sound absorption structure has the characteristics of high temperature resistance, high-speed airflow impact resistance and environmental protection, can realize different resonance frequencies by changing the parameters (aperture, plate thickness and perforation rate) of the micropunch plate according to requirements, can be suitable for high-frequency noise reduction in an air duct, and is mainly high-frequency.
The active noise reduction in the composite sound absorption device adopts indirect sound waves with opposite phases and same amplitude to noise signals to offset noise. The active sound absorption system comprises a sound sensor (such as a microphone sensor) and a loudspeaker, wherein the loudspeaker sends sound waves to change back sound pressure of the micro-perforated plate, the microphone is used for detecting whether the sound pressure is zero, the purpose is to change flow resistance, eliminate noise behind the micro-perforated plate, improve middle and low frequency sound absorption performance (mainly low frequency), and realize active and passive composite sound absorption. The invention has small change to the air duct structure, and has small influence on other performances such as air output, drying efficiency and the like while realizing noise reduction.
To further illustrate the technical solution of the present invention, the present invention provides the following examples.
Example 1
As shown in fig. 1 to 3, the present embodiment specifically discloses a composite sound absorption device for a drying air duct of a washing machine, which comprises: at least one group of active sound absorption structures and passive sound absorption structures which are correspondingly arranged. The passive sound absorption structure is used for passively absorbing noise in the drying air duct and comprises a cavity formed by outward bulges on the side wall of the drying air duct and a micro-perforated plate covering the opening of the cavity. The active sound absorption structure is used for actively silencing noise after sound absorption through the passive sound absorption structure and comprises a controller, a loudspeaker, a first sound sensor and a second sound sensor.
In the active sound absorption structure, the loudspeaker is arranged at the top of the cavity, the first sound sensor is arranged in front of the cavity, and the second sound sensor is arranged on the side wall of the cavity. The controller controls the loudspeaker to generate a secondary sound field to balance the sound pressure of the noise passing through the micro-perforated plate according to the first electric signal measured by the first sound sensor and the second electric signal measured by the second sound sensor. The first electric signal is a reference signal, the controller generates and controls the loudspeaker to generate a corresponding secondary sound field according to the reference signal, the sound pressure of noise which is absorbed by the micro-perforated plate is primarily balanced, the sound pressure is used as an adjusting signal according to the second electric signal, whether the sound pressure behind the micro-perforated plate is 0 or not is detected in real time, and when the sound pressure is not zero, the controller adjusts the secondary sound field generated by the loudspeaker according to the second electric signal.
In this embodiment, when the composite sound absorption device adopts a plurality of sets of active sound absorption structures and passive sound absorption structures which are correspondingly arranged, the plurality of sets of active sound absorption structures and passive sound absorption structures which are correspondingly arranged are sequentially arranged along the trend of the air duct. In the N active sound absorption structures, except that the first sound sensor and the second sound sensor are arranged in the first group of active sound absorption structures, the active sound absorption structures in other groups are only provided with the second sound sensor, and N is a positive integer larger than 1. The first group is arranged along the trend of the air duct, namely, only one first sound sensor arranged at the most upstream part (in front of the cavity of the first group) of the air duct needs to measure a reference signal, and then each active sound absorption structure is corrected and adjusted step by step according to a plurality of second sound sensors to generate a sound field in the corresponding cavity. The active sound absorption structure is mainly suitable for eliminating the noise in the middle and low frequency range, namely the noise with the frequency of 100-2000 Hz. Carry out the amortization through multiunit initiative sound absorbing structure and passive sound absorbing structure, improve holistic amortization efficiency.
In order to accurately measure whether the sound pressure in each cavity is 0, the second sound sensor is optionally disposed at the center of the sidewall of the cavity with respect to the installation position of the second sound sensor.
In this embodiment, the microperforated panel can eliminate high-frequency noise, mainly noise with a frequency of 2000-7000 Hz. Preferably, the micro-perforated plate is provided with a plurality of through holes, wherein the thickness of the micro-perforated plate is less than or equal to 1mm, the aperture of each through hole is less than or equal to 1mm, and the perforation rate is 4-6%.
In this embodiment, the cavity is a rectangular protruding structure disposed on the upper side wall surface of the drying air duct, wherein the long side of the rectangular protruding structure is in the same direction as the air supply air duct, and preferably, the protruding height is 3cm-4 cm.
Example 2
As shown in fig. 1 to 3, in the present embodiment, a composite sound absorption method for a drying duct of a washing machine is disclosed, which can perform sound attenuation using the composite sound absorption device described in embodiment 1. Firstly, arranging a composite sound absorption device on the side wall of an air duct; then, detecting the sound at the upstream of the air duct by using a first sound sensor, converting the sound into a first electric signal and sending the first electric signal to a controller; detecting sound absorbed by the first passive sound absorption structure by using a second sound sensor, converting the sound into a second point signal and sending the second point signal to the controller; the controller controls the active sound absorption structure to generate a secondary sound field for balancing noise according to the first electric signal so as to perform active sound absorption, and performs feedback adjustment on the secondary sound field generated by the active sound absorption structure according to the second electric signal.
The composite sound absorption device adopted by the composite sound absorption method in the embodiment is one of the composite sound absorption devices in embodiment 1, comprises two groups of correspondingly arranged active sound absorption structures and passive sound absorption structures, is suitable for a drying air duct of a washing machine, and can improve the silencing efficiency through active and passive sound absorption.
Specifically, the composite sound absorption device mainly comprises a first loudspeaker 1, a second loudspeaker 2, a first sound sensor 3, a second sound sensor 5, a second sound sensor 6 and a micro-perforated plate 4. When the cavity and the drying air duct are integrally arranged, two regular rectangular cavities with the height of about 3-4cm are formed on the drying air duct and close to the air outlet of the fan, and the cavities are positioned on the upper side wall of the air duct. Or the cavity is set as a large cavity, a partition plate is arranged in the middle of the cavity, and the cavity is divided into two parts, namely two independent small cavities are formed.
Lay two speakers and be used for initiative sound production on the positive upper portion of cavity, lay micropunch plate 4 at the level under the cavity is inside, the centre of cavity is equipped with the baffle, divide the cavity into two the same sound absorption units, arranged error sensor (two second sound sensors promptly) in the both sides of cavity, two sound sensors gather the noise behind the micropunch plate, judge whether its acoustic pressure is zero through the controller. At the anterior segment in wind channel, be close to fan department and arrange first sound sensor 3 for gather the initial noise signal in wind channel.
The primary sensor (namely the first sound sensor) converts a collected primary noise sound source signal into a first electric signal as a reference signal, a control signal generated after passing through the self-adaptive controller is amplified through an amplifier, the loudspeaker is driven to generate a secondary sound field, the sound pressure behind the micro-perforated plate is zero, when the error sensor (the second sound sensor) detects that the second electric signal is not 0, the second electric signal is fed back to the controller, the controller corrects and adjusts the second electric signal in real time, and the loudspeaker is driven to sound until the sound pressure signal approaches to 0. The purpose of active noise reduction is achieved.
In summary, the following steps: the active and passive composite sound absorption device of the drying air duct of the rolling washing machine is facilitated by utilizing a traditional sound absorption structure, a novel sound absorption material and an active noise reduction technology, the problem that low-frequency noise is difficult to control at present can be effectively solved under the condition that the influence on other performances such as air output, drying efficiency and the like is small, and the noise reduction of a drying system in a wide frequency band is realized.
In addition, the invention also discloses a washing machine which comprises a fan, a drying cylinder and a drying air duct, wherein the fan and the drying cylinder are connected through the drying air duct, and the drying air duct is provided with any one of the composite sound absorption devices in the embodiments.
Exemplary embodiments of the present disclosure are specifically illustrated and described above. It is to be understood that the present disclosure is not limited to the precise arrangements, instrumentalities, or instrumentalities described herein; on the contrary, the disclosure is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (5)
1. A composite sound absorption device for a drying air duct of a washing machine is characterized by comprising: the N groups of active sound absorption structures and passive sound absorption structures are correspondingly arranged and are sequentially connected, and the N groups of active sound absorption structures and passive sound absorption structures which are correspondingly arranged are arranged along the trend of the air duct;
the passive sound absorption structure is used for passively absorbing noise in the drying air duct and comprises a cavity formed by protruding outwards on the side wall of the drying air duct and a micro-perforated plate covering the opening of the cavity;
the active sound absorption structure is used for actively silencing the noise absorbed by the passive sound absorption structure and comprises a controller, a loudspeaker, a first sound sensor and a second sound sensor,
the loudspeaker is arranged at the top of the cavity, the first sound sensor is arranged in front of the cavity, the second sound sensor is arranged on the side wall of the cavity, and the controller controls the loudspeaker to generate a secondary sound field to balance the sound pressure of noise passing through the micro-perforated plate according to a first electric signal measured by the first sound sensor and a second electric signal measured by the second sound sensor; in the N active sound absorption structures, except that a first sound sensor and a second sound sensor are arranged in a first group of active sound absorption structures, the active sound absorption structures in other groups are only provided with the second sound sensor, and N is a positive integer greater than 1; the controller modifies the corresponding loudspeaker according to a second sound sensor in the nth active sound absorption structure, wherein N belongs to N;
the second sound sensor is arranged at the center of the side wall of the cavity; the micro-perforated plate is provided with a plurality of through holes, wherein the thickness of the micro-perforated plate is less than or equal to 1mm, the aperture of each through hole is less than or equal to 1mm, and the perforation rate is 4-6%.
2. The composite sound absorption device for the drying air duct of the washing machine as claimed in claim 1, wherein the cavity is a rectangular convex structure arranged on the upper side wall surface of the drying air duct, the long side of the rectangular convex structure is consistent with the direction of the drying air duct, and the height of the convex structure is 3cm-4 cm.
3. A composite sound absorption method for a drying air duct of a washing machine, which is characterized in that the method uses the composite sound absorption device of any one of the claims 1-2 to perform sound attenuation.
4. The composite sound absorption method for drying duct of washing machine according to claim 3,
arranging the composite sound absorption device on the side wall of the air duct;
detecting the sound at the upstream of the air duct by using a first sound sensor, converting the sound into a first electric signal and sending the first electric signal to a controller;
detecting sound absorbed by the first passive sound absorption structure by using a second sound sensor, converting the sound into a second point signal and sending the second point signal to the controller;
the controller controls the active sound absorption structure to generate a secondary sound field for balancing noise according to the first electric signal so as to perform active sound absorption, and adjusts the secondary sound field generated by the active sound absorption structure according to the second electric signal.
5. A washing machine comprising a fan, a drying drum and a drying duct, wherein the fan and the drying drum are connected by the drying duct, characterized in that the drying duct employs the composite sound absorbing device of any one of claims 1-2.
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| CN102760430A (en) * | 2012-08-06 | 2012-10-31 | 株洲时代新材料科技股份有限公司 | Double-layer composite micropunch sound absorption method and sound absorption panel |
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| CN209249071U (en) * | 2018-11-06 | 2019-08-13 | 株洲国创轨道科技有限公司 | Sound absorber |
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| JPH1011070A (en) * | 1996-06-20 | 1998-01-16 | Sharp Corp | Active noise controller |
| JP3510427B2 (en) * | 1996-08-15 | 2004-03-29 | 三菱重工業株式会社 | Active sound absorbing wall |
| JPH10143169A (en) * | 1996-11-14 | 1998-05-29 | Shinko Electric Co Ltd | Muffler |
| CN107767855B (en) * | 2017-09-15 | 2021-12-17 | 南京大学 | Active broadband sound insulation device for wall ventilation |
| CN108150753B (en) * | 2018-02-07 | 2024-09-20 | 北京市劳动保护科学研究所 | Active and passive composite muffler |
| CN208268639U (en) * | 2018-04-10 | 2018-12-21 | 桂林电子科技大学 | A kind of passive noise reduction system of pipeline master based on flexible microperforated panel |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102760430A (en) * | 2012-08-06 | 2012-10-31 | 株洲时代新材料科技股份有限公司 | Double-layer composite micropunch sound absorption method and sound absorption panel |
| CN207019366U (en) * | 2017-05-31 | 2018-02-16 | 青岛海尔智能技术研发有限公司 | A kind of denoising device |
| CN209249071U (en) * | 2018-11-06 | 2019-08-13 | 株洲国创轨道科技有限公司 | Sound absorber |
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