CN214698936U - Conformal embedded metamaterial device for low-frequency vibration and noise reduction of corrugated sandwich board - Google Patents
Conformal embedded metamaterial device for low-frequency vibration and noise reduction of corrugated sandwich board Download PDFInfo
- Publication number
- CN214698936U CN214698936U CN202120927611.6U CN202120927611U CN214698936U CN 214698936 U CN214698936 U CN 214698936U CN 202120927611 U CN202120927611 U CN 202120927611U CN 214698936 U CN214698936 U CN 214698936U
- Authority
- CN
- China
- Prior art keywords
- conformal
- corrugated sandwich
- metamaterial device
- noise reduction
- elastic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model provides a conformal embedded metamaterial device for low-frequency vibration and noise reduction of a corrugated sandwich plate, which comprises a base structure, mass elements arranged in an array manner and damping elements arranged in an array manner, wherein the base structure comprises elastic elements arranged in an array manner and a conformal supporting substructure; the conformal support substructures are arranged at two ends of the elastic elements arranged in an array manner and are integrally formed with the elastic elements arranged in the array manner; the elastic elements arranged in an array are sequentially spaced by the through holes arranged in an array, and each elastic element is provided with a mass element and a damping element; each elastic element and the mass element arranged on the elastic element form a local resonance microstructure unit, and the local resonance microstructure units are arranged in an array mode to enable the conformal embedded metamaterial device to generate a local resonance effect and inhibit the transmission of elastic waves in the corrugated sandwich board, so that the corrugated sandwich board has strong low-frequency sound insulation capability and low-frequency vibration and radiation noise inhibition capability.
Description
Technical Field
The utility model belongs to vibration and noise control new construction field especially relates to a conformal embedded metamaterial device that is used for corrugated sandwich board low frequency damping to fall and makes an uproar.
Background
The corrugated sandwich board is formed by combining an upper surface panel, a lower surface panel and a single-layer or multi-layer corrugated web core layer, has the remarkable advantages of light weight, high rigidity, high strength and the like, and is widely applied to the fields of national defense equipment, transportation and the like. Since such structures can be produced in large-scale integration by extrusion processes, they are also referred to as hollow extruded profiles, or simply hollow profiles, in some fields. However, such lightweight structures are susceptible to low frequency vibrations and noise, affecting ride comfort, compromising occupant health, reducing equipment reliability and service life. Due to the large wavelength and the strong transmission capability of the elastic waves/sound waves corresponding to the low-frequency vibration and the noise, the realization of low-frequency vibration and noise reduction is particularly difficult, and how to effectively inhibit the low-frequency vibration and the noise of the corrugated sandwich plate structure is a big problem in academic and engineering industries.
In recent years, metamaterial structures proposed and developed in the fields of acoustics physics and condensed state physics provide a new idea for solving the problems of low-frequency vibration and noise of the corrugated sandwich board. The metamaterial structure is a novel composite structure formed by attaching specially designed artificial microstructure units (such as local resonance units, vibrator units or vibrators for short) to a base structure in a certain mode, can obtain extraordinary physical characteristics (such as negative equivalent mass density, negative equivalent modulus and the like) which are not possessed by the traditional material/structure, and can realize extraordinary control over low-frequency elastic waves and acoustic waves, so that the metamaterial structure has wide application value in the field of low-frequency vibration and noise reduction. The artificial microstructure units of the traditional design are generally isolated (such as spring mass vibrators, hard and soft material block vibrators and the like), and the vibrator units need to be connected with the base structure one by one, so that the design has many advantages, but also has some defects, such as: each vibrator unit needs to be processed and connected respectively, so that the process is relatively complex, the cost is high, and time and labor are wasted; the error of the isolated processed microstructure unit is large, and the consistency is poor; in addition, due to the structural characteristics of the corrugated sandwich panel, the microstructure units in the traditional design are inconvenient to embed into the hollow core layer of the corrugated sandwich panel, so that the microstructure units are often required to be arranged on the outer surface of the corrugated sandwich panel, and therefore, extra space is required to be occupied, and extra installation cost is required; moreover, when effective protection measures are not taken, the microstructure units arranged on the outer surface are greatly influenced by the external environment, and when foreign objects contact the microstructure units, the microstructure units even fall off and fail. These drawbacks and deficiencies clearly limit the application of conventional metamaterial structures to the vibration and noise reduction of corrugated sandwich panels.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the problem that exists among the above-mentioned background art, provide a conformal embedded metamaterial device that is used for corrugated sandwich board low frequency damping to fall and makes an uproar, this metamaterial device has low frequency sound insulation concurrently, damping and acoustic radiation restrain the good performance, and make and simple to handle, low cost, the reliability is high, and do not occupy extra space, processing and installation that face when having overcome traditional metamaterial structural design scheme and being used for corrugated sandwich board are complicated, with high costs, the reliability is poor, and need occupy a great deal of shortcomings such as extra space.
In order to achieve the above purpose, the utility model discloses a technical scheme is: the conformal embedded metamaterial device for low-frequency vibration and noise reduction of the corrugated sandwich plate comprises a base body structure, mass elements arranged in an array manner, damping elements arranged in an array manner and through holes arranged in an array manner,
the base structure comprises elastic elements and conformal supporting substructures which are arranged in an array mode; the conformal support substructures are arranged at two ends of the elastic elements arranged in an array manner and are integrally formed with the elastic elements arranged in the array manner;
the elastic elements arranged in an array are sequentially spaced by the through holes arranged in an array, and each elastic element is provided with a mass element and a damping element; each elastic element and the mass element arranged on the elastic element form a local resonance microstructure unit, and the local resonance microstructure units are arranged in an array mode.
Further, the conformal support substructure has a first-order characteristic angle and a second-order characteristic angle for automatically and stably mounting the conformal embedded metamaterial structure inside a core layer of a corrugated sandwich panel without additional mounting measures.
Further, in the elastic elements arranged in an array, the size of each elastic element is the same or gradually and gradually changed in an increasing way or gradually and gradually changed in a decreasing way.
Further, in the arrayed mass elements, the size of each mass element is the same or gradually increases or gradually decreases.
Furthermore, the conformal embedded metamaterial device is arranged in a cavity inside a core layer of the corrugated sandwich plate in a single-layer, double-layer or multi-layer mode; the conformal embedded metamaterial device is arranged in each cavity inside the core layer of the corrugated sandwich plate or is selectively arranged in partial cavities.
Further, the conformal support substructure surface has a roughness.
Further, the conformal support substructure is a homogeneous plate structure or a perforated plate structure with holes.
Further, the mass element is arranged on one side of each elastic element or arranged on two sides of each elastic element simultaneously; the damping elements are mounted on a single side of each elastic element or on both sides of each elastic element.
Further, the cross-sectional shape of the mass element is circular, square, rectangular or polygonal; the shape of the through hole is rectangular, trapezoidal or gradually deformed in a step manner.
Furthermore, the base structure and the mass element are both made of metal materials or non-metal materials; the damping element is made of a single viscoelastic material or a layered constraint damping material formed by compounding the viscoelastic material and a constraint layer.
The utility model discloses has following technological effect:
the utility model is used for the vibration and noise reduction of the corrugated sandwich plate, provides a conformal embedded metamaterial device for the corrugated sandwich plate, has the excellent performances of low-frequency sound insulation, vibration reduction and sound radiation inhibition, and has the advantages of low processing and manufacturing cost, convenient installation, high reliability and no extra occupied space; meanwhile, the rigidity of the corrugated sandwich plate can be improved, so that the bearing capacity of the structure is improved; the embedded conformal installation can also generate internal contact interface friction damping, so that the vibration and noise reduction effect is further improved; in addition, the function of widening the low-frequency vibration-damping noise-reducing frequency band can be conveniently realized through the gradual change design of the parameters of the elastic elements or the mass elements and the multi-layer gradual arrangement design of the metamaterial structure. The utility model overcomes the processing of the isolated metamaterial structure of tradition and installation are complicated, with high costs, the reliability is poor, need occupy extra space, be not convenient for realize shortcomings such as low frequency broadband damping noise reduction effect.
Drawings
FIG. 1 is a schematic view of the conformal embedded metamaterial device for low frequency vibration and noise reduction of a corrugated sandwich panel of the present invention installed on the corrugated sandwich panel;
fig. 2 is an enlarged view of the detail at (a) in fig. 1, which is a schematic structural diagram of the conformal embedded metamaterial device for low-frequency vibration and noise reduction of the corrugated sandwich plate according to the present invention;
FIG. 3 is a front view of the conformal embedded metamaterial device for low frequency vibration and noise reduction of corrugated sandwich panel of the present invention;
fig. 4 is a schematic diagram of different structures of a local resonance microstructure unit, wherein (c) and (d) in fig. 4 are respectively schematic diagrams when elastic elements are different, and (e) in fig. 4 is a schematic diagram when mass elements are different;
fig. 5 is a schematic diagram of different installation of a conformal embedded metamaterial device in a corrugated sandwich panel, wherein (f), (g) and (h) in fig. 5 are schematic diagrams of the conformal embedded metamaterial device being installed in a single-layer manner, a double-layer manner and a multi-layer manner, respectively;
FIG. 6 is a schematic diagram of different structures of a conformal support substructure, wherein (i) in FIG. 6 is a uniform plate structure, and (j) in FIG. 6 is a perforated plate structure;
FIG. 7 is a graph comparing sound insulation for a corrugated sandwich panel and an optical corrugated sandwich panel with the conformal embedded metamaterial installed;
fig. 8 is a graph comparing forced vibration displacement response of a corrugated sandwich panel and an optical corrugated sandwich panel with the conformal embedded metamaterial installed.
Remarks to the attached drawings: 1-a matrix structure; 1 a-a conformal support substructure; 1 b-a resilient element; 2-a mass element; 3-a damping element; 4-a through hole; 5-first order characteristic angle; 6-second order characteristic angle; 7-corrugated sandwich panel.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clear, the present invention will be further explained with reference to the accompanying drawings, exemplary embodiments and descriptions thereof.
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive. Any feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
In the description of the present invention, it is to be understood that the terms "first order" and "second order" are used merely for convenience of description and for simplicity of description, and do not indicate or imply the superiority or inferiority or order of the devices or elements referred to. And, as such, these terms are not to be construed as limiting the invention.
Referring to fig. 1 to 3, the present invention provides a conformal embedded metamaterial device for low frequency vibration and noise reduction of a corrugated sandwich board, the conformal embedded metamaterial device includes a base structure 1, mass elements 2 arranged in an array, damping elements 3 arranged in an array, and through holes 4 arranged in an array; the matrix structure 1 is composed of a conformal supporting substructure 1a and elastic elements 1b arranged in an array manner; the conformal supporting substructures 1a are arranged at two ends of the elastic elements 1b which are arranged in an array manner and are integrally formed with the elastic elements which are arranged in the array manner; the conformal support substructure 1a serves to securely mount the conformal embedded metamaterial structure inside the core layer of the corrugated sandwich panel 7.
The elastic elements 1b arranged in an array are sequentially spaced through holes 4 arranged in an array, and each elastic element 1b is provided with a mass element 2 and a damping element 3; each elastic element 1b and the mass element 2 arranged on the elastic element form a local resonance microstructure unit, and the local resonance microstructure units are arranged in an array mode, so that the conformal embedded metamaterial device can generate a local resonance effect, the elastic wave transmission in the corrugated sandwich plate 7 is effectively inhibited, and the corrugated sandwich plate 7 has strong low-frequency sound insulation capability and low-frequency vibration and radiation noise inhibition capability.
Preferably, the mass element 2 is firmly connected to the arrayed elastic element 1 b; the damping element 3 is applied to the surface of the arrayed elastic element 1b, and the damping effect thereof can be adjusted by adjusting the size and the application position of the damping element 3.
Preferably, the conformal support substructure 1a has a first order characteristic angle 5 and a second order characteristic angle 6. Specifically, the conformal supporting substructure 1a is formed by connecting a first supporting plate, a second supporting plate and a third supporting plate which are connected in sequence, a first-level characteristic angle is formed between the first supporting plate and the second supporting plate, a first-level characteristic angle is formed between the second supporting plate and the third supporting plate, and the first supporting plate is connected with the elastic elements arranged in an array manner and is positioned on the same plane. The size of the conformal supporting substructure 1a, the size of the primary characteristic angle 5 and the size of the secondary characteristic angle 6 are determined according to the geometric configuration of the inner cavity of the core layer of the corrugated sandwich plate 7, so that the conformal embedded metamaterial device can be embedded into the inner cavity of the core layer of the corrugated sandwich plate 7 and can be constrained by the wall of the core layer of the corrugated sandwich plate 7 to generate pretightening force, and the conformal embedded metamaterial device can be automatically and stably installed inside the core layer of the corrugated sandwich plate 7 without additional installation measures.
Preferably, referring to fig. 4, in the elastic elements 1b arranged in an array, the sizes of the elastic elements may be the same or different (refer to (c) and (d) in fig. 4); when the sizes of the elastic elements are different, the rigidity of the elastic elements can be different, so that the conformal embedded metamaterial device can generate a dual-frequency or multi-frequency local resonance effect, and further the dual-frequency or multi-frequency vibration and noise reduction effect is realized; when the size of each elastic element is designed to gradually increase or decrease, the conformal embedded metamaterial device can generate a broadband gradual local resonance effect, so that broadband vibration reduction and noise reduction effects are achieved.
Preferably, in the mass elements 2 arranged in an array, the sizes of the mass elements may be the same or different (see (e) in fig. 4); when the sizes of the mass elements are different, the conformal embedded metamaterial device can generate a dual-frequency or multi-frequency local resonance effect, so that a dual-frequency or multi-frequency vibration and noise reduction effect is realized; when the size of each mass element is designed to gradually increase or decrease, the conformal embedded metamaterial device can generate a broadband gradual local resonance effect, so that broadband vibration reduction and noise reduction effects are achieved.
Preferably, referring to fig. 5, the conformal embedded metamaterial device can be installed in a single-layer manner in the core layer internal cavity of the corrugated sandwich plate 7, and can also be installed in a double-layer or multi-layer manner in the core layer internal cavity of the corrugated sandwich plate 7; when the corrugated sandwich plate is installed in a double-layer or multi-layer mode, the inner cavity space of the core layer of the corrugated sandwich plate 7 can be fully utilized, and the dual-frequency, multi-frequency or broadband vibration and noise reduction effect can be realized under the condition of not occupying the external space by regulating and controlling the parameters of the conformal embedded metamaterial devices on different layers.
Preferably, the conformal embedded metamaterial device can be installed in each cavity inside the core layer of the corrugated sandwich plate 7, and can also be selectively installed in part of the cavities (see fig. 1); the conformal embedded metamaterial devices installed in different cavities may have the same or different configurations and parameters.
Preferably, the mounting pre-tightening force of the conformal embedded metamaterial device can be increased by designing the size of the conformal support substructure 1a, the size of the primary characteristic angle 5 and the size of the secondary characteristic angle 6, so as to improve the structural rigidity and the load-bearing capacity of the corrugated sandwich panel 7.
Preferably, under the action of vibration or noise excitation, the contact surface between the conformal support substructure 1a and the corrugated sandwich plate structure 7 can rub to generate a damping energy dissipation effect, so that the vibration and noise reduction performance of the structure is improved; the surface roughness of the conformal supporting substructure 1a can be artificially increased to enhance the friction effect and further improve the damping effect and the vibration and noise reduction performance.
Preferably, referring to fig. 6, the conformal support substructure 1a may be a homogeneous plate structure, or may be a perforated plate structure or a perforated plate structure with holes.
Preferably, the mass element 2 may be attached to only one surface of the arrayed elastic element 1b, or may be attached to both surfaces of the arrayed elastic element 1 b. The damper element 3 may be attached to only one surface of the arrayed elastic element 1b, or may be attached to both surfaces of the arrayed elastic element 1 b.
Preferably, the mass element 2 may be mounted at or near the middle of the arrayed elastic element 1b, or at or near both ends of the arrayed elastic element 1 b. When the mass element 2 is arranged right at or near the middle of the arrayed elastic element 1b, the damping element 3 is arranged at or near the middle of the arrayed elastic element 1 b; when the mass element 2 is mounted right at or near both ends of the arrayed elastic element 1b, the arrayed damping elements 3 are mounted at both ends of the arrayed elastic element 1b which are not at or near.
Preferably, the cross-sectional shape of the mass element 2 may be circular, square, rectangular, polygonal.
Preferably, the shape of the through hole 4 can be rectangular, trapezoidal or gradually deformed in a step. The arrayed through holes 4 are used for sequentially spacing the arrayed elastic elements 1b to realize the arraying, namely the elastic elements 1b and the through holes 4 sequentially expand and extend from front to back or the through holes 4 and the elastic elements 1b sequentially expand and extend from front to back.
Preferably, the material of the base structure 1 may be a metal material or a non-metal material, typically steel, iron, an aluminum alloy, plexiglass, plastic, or a composite material. The mass element 2 may be made of a metallic material or a non-metallic material, typically steel, iron, copper, magnets, stone. The damping element 3 may be made of a single viscoelastic material, typically rubber or polyurethane, or a layered constrained damping material formed by compounding a viscoelastic material and a constrained layer.
The following description is made in detail with reference to specific embodiments for the embedded metamaterial structure for low frequency vibration and noise reduction of the corrugated sandwich board provided by the present invention.
Example 1:
the shape of the arrayed elastic element 1b is selected to be rectangular, the length is 76mm, the width is 20mm, the thickness is 0.8mm, and the material is steel; the cross section of the arrayed mass element 2 is selected to be rectangular, the length of the cross section is 20mm, the width of the cross section is 20mm, the height of the cross section is 20mm, and the material is steel; for convenient calculation, the damping element 3 applied on the elastic element 1b is equivalent to the damping of the elastic element, and the loss factor is taken as 0.1; the shape of the arrayed through holes 4 is rectangular, the length is 76mm, and the width is 10 mm; the sound insulation research is carried out aiming at a typical corrugated sandwich plate structure of a floor aluminum profile of a certain high-speed train, the total thickness of the sound insulation research is about 80mm, the thicknesses of an upper surface panel, a lower surface panel and a sandwich layer web are about 5mm and 3mm respectively, the span of a cellular is about 130mm, and a periodic boundary condition is applied during sound insulation calculation. With reference to fig. 7, compared with an optical sandwich board, in a wide low-frequency range of 210 to 280Hz, the sound insulation of the corrugated sandwich board structure provided with the conformal embedded metamaterial device is improved by more than 8dB, and the maximum sound insulation is improved by more than 16dB at about 260 Hz.
Example 2:
the shape of the arrayed elastic element 1b is selected to be rectangular, the length is 76mm, the width is 20mm, the thickness is 0.8mm, and the material is steel; the cross section of the arrayed mass elements 2 is selected to be rectangular, the length and the width of each mass element are both 20mm, the height of each mass element is three, the three are respectively 25mm, 15mm and 10mm, the three mass elements are sequentially arranged according to the mode of … … from 25mm to 15mm to 10mm to 25mm, and the material is steel; for convenient calculation, the damping element 3 applied on the elastic element 1b is equivalent to the damping of the elastic element, and the loss factor is taken as 0.1; the shape of the arrayed through holes 4 is rectangular, the length is 76mm, and the width is 10 mm; vibration reduction research is carried out on the corrugated sandwich plate structure in case 1, the length of the structure is selected to be 1440mm, and unit side load is applied to one end of the structure. Referring to fig. 8, compared with an optical sandwich plate, in a wide low-frequency range of 230-390 Hz, vibration displacement responses of the corrugated sandwich plate structure provided with the conformal embedded metamaterial device are reduced by more than 10dB, and at about 277Hz, the displacement responses are reduced by 46dB at most.
The results show that: the utility model provides a conformal embedded metamaterial device for corrugated sandwich board low frequency damping is fallen and is made an uproar has the excellent damping and fall ability of making an uproar at the target low frequency channel to can arrange the design gradually through elastic element or quality element design, metamaterial structure multilayer gradually and realize the function that its low frequency resonance frequency band was widened.
The above description is only one of the preferred embodiments of the present invention, but the scope of the present invention is not limited thereto. Various modifications and equivalent arrangements other embodiments, which are obvious to those skilled in the art and based on or by reference to the teachings of the present invention, are also within the scope of the present invention.
Claims (10)
1. A conformal embedded metamaterial device for corrugated sandwich panel low frequency damping is fallen and is made an uproar, its characterized in that: the conformal embedded metamaterial device comprises a base structure, mass elements arranged in an array mode, damping elements arranged in an array mode and through holes arranged in an array mode;
the base structure comprises elastic elements and conformal supporting substructures which are arranged in an array mode; the conformal support substructures are arranged at two ends of the elastic elements arranged in an array manner and are integrally formed with the elastic elements arranged in the array manner;
the elastic elements arranged in an array are sequentially spaced by the through holes arranged in an array, and each elastic element is provided with a mass element and a damping element; each elastic element and the mass element arranged on the elastic element form a local resonance microstructure unit, and the local resonance microstructure units are arranged in an array mode.
2. The conformal embedded metamaterial device for low frequency vibration and noise reduction of a corrugated sandwich panel as claimed in claim 1, wherein: the conformal support substructure has a first-level characteristic angle and a second-level characteristic angle for automatically and stably mounting the conformal embedded metamaterial structure inside a core layer of a corrugated sandwich panel without additional mounting measures.
3. The conformal embedded metamaterial device for low frequency vibration and noise reduction of a corrugated sandwich panel as claimed in claim 1, wherein: in the elastic elements arranged in an array, the size of each elastic element is the same or gradually and gradually changed in an increasing way or gradually and gradually changed in a decreasing way.
4. The conformal embedded metamaterial device for low frequency vibration and noise reduction of a corrugated sandwich panel as claimed in claim 1, wherein: in the arrayed mass elements, the size of each mass element is the same or gradually increases or gradually decreases.
5. The conformal embedded metamaterial device for low frequency vibration and noise reduction of a corrugated sandwich panel as claimed in claim 1, wherein: the conformal embedded metamaterial device is arranged in a cavity inside a core layer of the corrugated sandwich board in a single-layer, double-layer or multi-layer mode; the conformal embedded metamaterial device is arranged in each cavity inside the core layer of the corrugated sandwich plate or is selectively arranged in partial cavities.
6. The conformal embedded metamaterial device for low frequency vibration and noise reduction of a corrugated sandwich panel as claimed in claim 1, wherein: the conformal support substructure surface has a roughness.
7. The conformal embedded metamaterial device for low frequency vibration and noise reduction of a corrugated sandwich panel as claimed in claim 1, wherein: the conformal support substructure is a homogeneous plate structure or a perforated plate structure with holes.
8. The conformal embedded metamaterial device for low frequency vibration and noise reduction of a corrugated sandwich panel as claimed in claim 1, wherein: the mass element is arranged on one side of each elastic element or simultaneously arranged on two sides of each elastic element; the damping elements are mounted on a single side of each elastic element or on both sides of each elastic element.
9. The conformal embedded metamaterial device for low frequency vibration and noise reduction of a corrugated sandwich panel as claimed in claim 1, wherein: the cross-sectional shape of the mass element is circular, square, rectangular or polygonal.
10. The conformal embedded metamaterial device for low frequency vibration and noise reduction of a corrugated sandwich panel as claimed in claim 1, wherein: the shape of the through hole is rectangular or trapezoidal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120927611.6U CN214698936U (en) | 2021-04-30 | 2021-04-30 | Conformal embedded metamaterial device for low-frequency vibration and noise reduction of corrugated sandwich board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120927611.6U CN214698936U (en) | 2021-04-30 | 2021-04-30 | Conformal embedded metamaterial device for low-frequency vibration and noise reduction of corrugated sandwich board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214698936U true CN214698936U (en) | 2021-11-12 |
Family
ID=78535228
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120927611.6U Active CN214698936U (en) | 2021-04-30 | 2021-04-30 | Conformal embedded metamaterial device for low-frequency vibration and noise reduction of corrugated sandwich board |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214698936U (en) |
-
2021
- 2021-04-30 CN CN202120927611.6U patent/CN214698936U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109616092B (en) | Metamaterial type light structure with low-frequency vibration and noise reduction and sound insulation functions | |
| CN110751937A (en) | High-rigidity high-damping local resonance unit for constructing acoustic metamaterial structure | |
| US7249653B2 (en) | Acoustic attenuation materials | |
| CN108119588B (en) | Low-frequency broadband vibration suppression structure based on double-period forbidden band characteristic | |
| CN109754776B (en) | Low-frequency broadband sound absorption covering layer embedded with cylindrical cavity array | |
| CN111365399A (en) | Adjustable portable dynamic vibration absorber and operation method thereof | |
| CN113027969B (en) | Conformal embedded metamaterial structure for low-frequency vibration and noise reduction of corrugated sandwich board | |
| CN113314088A (en) | Heterogeneous/special-shaped acoustic black hole and phonon crystal mixed vibration and noise reduction enhancement structure | |
| WO2022228269A1 (en) | Thin-layer low-frequency underwater sound insulation metamaterial | |
| CN212256904U (en) | High-rigidity high-damping local resonance unit for constructing acoustic metamaterial structure | |
| CN214698936U (en) | Conformal embedded metamaterial device for low-frequency vibration and noise reduction of corrugated sandwich board | |
| CN109572105B (en) | Marine multilayer composite sound insulation structure | |
| CN113753173A (en) | Sound insulation, vibration reduction and noise suppression multifunctional integrated metamaterial plate shell structure and preparation method thereof | |
| KR100629249B1 (en) | Isolating structure for floor to floor impact sound of apartment building | |
| CN113674727A (en) | Deep sub-wavelength low-frequency sound absorption structure and sound absorption unit | |
| KR101950694B1 (en) | Sound insulation panel of railway car body walls for reducing the interior noise | |
| KR100930574B1 (en) | Manufacturing method of noise reduction buffer member and mold used therein | |
| CN214144209U (en) | Vibration isolation and noise reduction floating construction system | |
| CN110853609B (en) | Underwater acoustic covering layer based on coupling resonance of multilayer scatterers and cavity | |
| KR200378484Y1 (en) | Isolating structure for floor to floor impact sound of apartment building | |
| JP2003343161A (en) | Door structure | |
| CN108924699B (en) | Carbon fiber composite horn device capable of reducing and inhibiting resonance | |
| CN210881143U (en) | Integrated sewage treatment equipment manufacturing plate | |
| Hook et al. | Acoustic Black Holes in Curved Plates | |
| CN210421473U (en) | High-temperature-resistant impedance combined broadband sound absorber for machine room |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |