CN109801617A - Tunable local resonance structural unit for constructing acoustic metamaterial - Google Patents
Tunable local resonance structural unit for constructing acoustic metamaterial Download PDFInfo
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- CN109801617A CN109801617A CN201910066496.5A CN201910066496A CN109801617A CN 109801617 A CN109801617 A CN 109801617A CN 201910066496 A CN201910066496 A CN 201910066496A CN 109801617 A CN109801617 A CN 109801617A
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Abstract
The invention belongs to the field of acoustic metamaterials, and discloses a frequency-adjustable local resonance structural unit for constructing an acoustic metamaterial, which comprises a vibrator mass structure 1, a vibrator rigidity structure 2, a supporting structure 3 and an adjusting device 4, wherein the adjusting device 4 is arranged on the vibrator rigidity structure 2, the vibrator mass structure 1 is arranged on the vibrator rigidity structure 2, the installation position of the vibrator mass structure 1 on the vibrator rigidity structure 2 can be flexibly adjusted along the adjusting device 4, and the supporting structure 3 is connected with the vibrator rigidity structure 2. According to the structure unit, under the condition that structure and material parameters do not need to be changed, the position of the oscillator mass structure 1 on the oscillator rigidity structure 2 is adjusted along the adjusting device 4, the resonance frequency of the local resonance unit can be changed, the purpose that the resonance frequency of the local resonance unit is flexibly adjustable is achieved, the defect that the resonance frequency of a traditional artificial acoustic microstructure unit is difficult to adjust is overcome, and the structure is simple.
Description
Technical field
The invention belongs to acoustic metamaterial field more particularly to Frequency Adjustable locally resonant structural units.
Background technique
Acoustic metamaterial refers to artificial acoustics microstructure unit (such as locally resonant structural unit, or letter by special designing
Claim oscillator) the novel acoustic material that is constituted in elastic fluid of periodic arrangement or structure, it can obtain what nature material did not had
Extraordinary physical characteristic (such as negative mass density, negative refraction, negative norm amount), may be implemented the extraordinary manipulation to elastic wave and sound wave, makes
It obtains it and is owned by very considerable application prospect in various fields, such as acoustics cape, acoustic imaging, sound sieve, vibration and noise reducing etc..
Artificial acoustics microstructure unit is the basic unit for constructing acoustic metamaterial, and it is super to directly affect acoustic metamaterial
The performance of normal physical characteristic.The artificial acoustics microstructure unit of traditional design mainly has spring-mass oscillator, the vibration of hard soft material block
Son, film lumped mass oscillator, helicon, double cantilever beam oscillator etc.；The resonant frequency of these artificial acoustics microstructure units
It is usually determined by the inherent characteristic of its own, if wanting to adjust or change its resonant frequency, is generally required by changing structure or material
The method of parameter is expected to carry out redesign manufacture, this undoubtedly limits the applicability of artificial acoustics microstructure unit, makes it not
It is able to satisfy the requirement of frequency modulation function in practical application.
The present invention is based on the innovative design methods of acoustic metamaterial, and the adjustable design philosophy of flexible structure is introduced into manually
In the design of acoustics microstructure unit, has the advantages that artificial acoustics microstructure unit resonant frequency flexibly adjustable, overcome
Traditional artificial acoustics microstructure unit resonant frequency is difficult to the defect adjusted, and the prior art does not disclose the Frequency Adjustable in the present invention
Locally resonant unit.
Summary of the invention
The problem of the purpose of the present invention is to solve above-mentioned background techniques, is provided for constructing acoustic metamaterial
Frequency Adjustable locally resonant structural unit, have flexible frequency modulation function, it is total to overcome traditional artificial acoustics microstructure unit
Vibration frequency is difficult to the deficiency adjusted, and structure is simple.
In order to achieve the above object, the technical solution adopted by the present invention is that:
For constructing the Frequency Adjustable locally resonant structural unit of acoustic metamaterial, the Frequency Adjustable locally resonant structural unit
Including oscillator quality structure 1, oscillator stiffness structure 2, support construction 3, regulating device 4, it is characterised in that: the oscillator rigidity knot
Regulating device 4 is provided on structure 2, oscillator quality structure 1 is installed in oscillator stiffness structure 2, and oscillator quality structure 1 is shaking
Installation site in sub- stiffness structure 2 can be along 4 flexible modulation of regulating device, the support construction 3 and 2 phase of oscillator stiffness structure
Connection, and play a part of to support oscillator stiffness structure 2.
Further, the structure type of the oscillator stiffness structure 2 can be circular sheet or rectangular sheets beam piece, and circle is thin
Plate or the regulating device of rectangular sheets beam on piece setting are sliding slot；The structure type of oscillator stiffness structure 2 can also be circular elongated
Bar, the regulating device being arranged in elongate rod are screw thread.
Further, when the structure type of the oscillator stiffness structure 2 is circular sheet, support construction 3 is to oscillator rigidity
The supporting way of structure 2 can be for midfoot support or close to midfoot support, can also be for outer edge thereof or close to outer edge branch
Support；When the structure type of oscillator stiffness structure 2 is rectangular sheets beam piece, supporting way of the support construction 3 to oscillator stiffness structure 2
It can also support for both ends or be supported close to both ends for midfoot support or close to midfoot support；Oscillator stiffness structure 2
Structure type when being circular elongated bar, support construction 3 can be midfoot support or to lean on to the supporting way of oscillator stiffness structure 2
Nearly midfoot support.
Further, when the regulating device being arranged in the oscillator stiffness structure 2 is sliding slot, the position of sliding slot is arranged inclined
At support, cooperation slide bar is correspondingly arranged on oscillator quality structure 1；The regulating device being arranged in oscillator stiffness structure 2 is spiral shell
When line, the position of screw thread is positioned away from support, and is correspondingly arranged on matching thread on oscillator quality structure 1.
Further, the Frequency Adjustable locally resonant structural unit can be simple oscialltor form or discrete distribution
Or stack more oscillator forms in parallel.
Further, the oscillator quality structure 1 can be by steel, copper, stone material, magnet, organic glass or composite material, layer
Condensation material is made, the oscillator stiffness structure 2, support construction 3 can by the metal materials such as steel, aluminium, copper or organic glass, PVC,
The nonmetallic materials such as timber or composite material, laminate are made.
The present invention has the following technical effect that the present invention for constructing acoustic metamaterial, is varying without structure and material
In the case where parameter, along regulating device, position of the oscillator quality structure in oscillator stiffness structure is adjusted, thus it is possible to vary local
The resonant frequency of resonating member realizes locally resonant unit resonant frequency flexibly adjustable purpose, overcomes traditional artificial sound
It learns microstructure unit resonant frequency and is difficult to the deficiency adjusted, and structure is simple.
Detailed description of the invention
Fig. 1 is the schematic diagram of the Frequency Adjustable locally resonant structural unit for constructing acoustic metamaterial of the invention.
Attached drawing remarks: 1- oscillator quality structure, 2- oscillator stiffness structure, 3- support construction, 4- regulating device.
Specific embodiment
To keep the purposes, technical schemes and advantages implemented of the present invention relatively sharp, with reference to the accompanying drawing, illustrative examples
And its present invention is further explained in explanation.
The problem of the purpose of the present invention is to solve above-mentioned background techniques, is provided for constructing acoustic metamaterial
Frequency Adjustable locally resonant structural unit, have flexible frequency modulation function, it is total to overcome traditional artificial acoustics microstructure unit
Vibration frequency is difficult to the deficiency adjusted, and structure is simple.
Refering to fig. 1, the present invention provides the Frequency Adjustable locally resonant structural units for constructing acoustic metamaterial；It is described can
Frequency modulation locally resonant structure includes oscillator quality structure 1, oscillator stiffness structure 2, support construction 3, regulating device 4；The oscillator
Regulating device 4 is provided in stiffness structure 2, oscillator quality structure 1 is installed in oscillator stiffness structure 2, and oscillator quality knot
Installation site of the structure 1 in oscillator stiffness structure 2 can be along 4 flexible modulation of regulating device, the support construction 3 and oscillator rigidity
Structure 2 is connected, and plays a part of to support oscillator stiffness structure 2.
Preferably, the structure type of the oscillator stiffness structure 2 can be circular sheet or rectangular sheets beam piece, circular sheet
Or the regulating device of rectangular sheets beam on piece setting is sliding slot；The structure type of oscillator stiffness structure 2 can also be circular elongated bar,
The regulating device being arranged in elongate rod is screw thread.
Preferably, when the structure type of the oscillator stiffness structure 2 is circular sheet, support construction 3 is to oscillator rigidity knot
The supporting way of structure 2 can be for midfoot support or close to midfoot support, can also be for outer edge thereof or close to outer edge thereof；
When the structure type of oscillator stiffness structure 2 is rectangular sheets beam piece, support construction 3 can to the supporting way of oscillator stiffness structure 2
Think midfoot support or close to midfoot support, can also support for both ends or be supported close to both ends；Oscillator stiffness structure 2
When structure type is circular elongated bar, support construction 3 can be midfoot support or close to the supporting way of oscillator stiffness structure 2
Midfoot support.
Preferably, when the regulating device being arranged in the oscillator stiffness structure 2 is sliding slot, the position of sliding slot is positioned away from
At support, cooperation slide bar is correspondingly arranged on oscillator quality structure 1；The regulating device being arranged in oscillator stiffness structure 2 is screw thread
When, the position of screw thread is positioned away from support, and is correspondingly arranged on matching thread on oscillator quality structure 1.
Preferably, the Frequency Adjustable locally resonant structural unit can be simple oscialltor form, or it is discrete distribution or
Stack more oscillator forms in parallel.
Preferably, the oscillator quality structure 1 can be by steel, copper, stone material, magnet, organic glass or composite material, laminated
Material is made, and the oscillator stiffness structure 2, support construction 3 can be by the metal materials such as steel, aluminium, copper or organic glass, PVC, wood
The nonmetallic materials such as material or composite material, laminate are made.
Below in conjunction with specific embodiment to the Frequency Adjustable locally resonant knot provided by the present invention for constructing acoustic metamaterial
Structure unit is described in detail.
Referring to Fig. 1, the present invention provides the Frequency Adjustable locally resonant structural units for constructing acoustic metamaterial；It is described
Frequency Adjustable locally resonant structural unit includes oscillator quality structure 1, oscillator stiffness structure 2, support construction 3, regulating device 4；Institute
It states and is provided with regulating device 4 in oscillator stiffness structure 2, oscillator quality structure 1 is installed in oscillator stiffness structure 2, and oscillator
Installation site of the quality structure 1 in oscillator stiffness structure 2 can be along 4 flexible modulation of regulating device, the support construction 3 and vibration
Sub- stiffness structure 2 is connected, and plays a part of to support oscillator stiffness structure 2.
Embodiment one:
Locally resonant unit uses simple oscialltor form, and oscillator stiffness structure 2 is rectangular sheets beam piece, length and width, thick size
For 130mm × 12mm × 2mm, it is symmetrically set with two adjusting sliding slots in oscillator stiffness structure 2, the length and width of each sliding slot,
Thickness is having a size of 50mm × 3mm × 2mm；Support construction 3 is midfoot support, oscillator quality to the supporting way of oscillator stiffness structure 2
The single weight of structure 1 is 13g, and oscillator quality structure 1 is installed on the sliding slot in oscillator stiffness structure 2 at supporting point 30mm
In；Oscillator quality structure 1, which is adopted, to be made of a steel, and oscillator stiffness structure 2 is all made of aluminium and is made, and support construction 3 is made of PVC.
Embodiment two:
The other parameters and embodiment one of embodiment two are identical, only distinguishing to be, in embodiment two, oscillator quality structure
1 is installed in oscillator stiffness structure 2 in the sliding slot at supporting point 40mm.
Embodiment three:
The other parameters and embodiment one of embodiment three are identical, only distinguishing to be, in embodiment three, oscillator quality structure
1 is installed in oscillator stiffness structure 2 in the sliding slot at supporting point 50mm.
The resonant frequency of one structural unit of preferred embodiment of the present invention is the resonance of 289Hz, two structural unit of embodiment
Frequency is 211Hz, and the resonant frequency of three structural unit of embodiment is 159Hz.The result shows that: do not changing original structure and material ginseng
In the case where number, along regulating device 4, by adjusting position of the oscillator quality structure 1 in oscillator stiffness structure 2, Ke Yiling
The resonant frequency living for changing locally resonant unit；It is compared with traditional locally resonant structural unit, what the present invention designed is used for structure
The Frequency Adjustable locally resonant structural unit for making acoustic metamaterial, realizes the purpose of the flexible frequency modulation of resonant frequency, overcomes tradition
Artificial acoustics microstructure unit resonant frequency is difficult to the deficiency adjusted, and structure is simple.
The above, the only present invention preferably one of specific embodiment, but protection scope of the present invention is not limited to
In this.Relevant technical staff in the field based on or use for reference the various modifications or equivalent arrangements that obtain easily of inventive concept other
Embodiment belongs to the scope of protection of the invention.
Claims (6)
1. the Frequency Adjustable locally resonant structural unit for constructing acoustic metamaterial, including oscillator quality structure (1), oscillator rigidity
Structure (2), support construction (3), regulating device (4), it is characterised in that: adjusting dress is provided on the oscillator stiffness structure (2)
It sets (4), oscillator quality structure (1) is installed on oscillator stiffness structure (2), and oscillator quality structure (1) is in oscillator rigidity knot
Installation site on structure (2) can be along regulating device (4) flexible modulation, the support construction (3) and oscillator stiffness structure (2) phase
Connection plays a part of to support oscillator stiffness structure (2).
2. according to claim 1 for constructing the Frequency Adjustable locally resonant structural unit of acoustic metamaterial, feature exists
In: the structure type of the oscillator stiffness structure (2) can be circular sheet or rectangular sheets beam piece, circular sheet or rectangular sheets
The regulating device of beam on piece setting is sliding slot；The structure type of oscillator stiffness structure (2) can be also circular elongated bar, in elongate rod
The regulating device of setting is screw thread.
3. according to claim 2 for constructing the Frequency Adjustable locally resonant structural unit of acoustic metamaterial, feature exists
In: when the structure type of the oscillator stiffness structure (2) is circular sheet, branch of the support construction (3) to oscillator stiffness structure (2)
Support mode can be for midfoot support or close to midfoot support, can also be for outer edge thereof or close to outer edge thereof；Oscillator is rigid
When the structure type for spending structure (2) is rectangular sheets beam piece, support construction (3) can to the supporting way of oscillator stiffness structure (2)
Think midfoot support or close to midfoot support, can also support for both ends or be supported close to both ends；Oscillator stiffness structure (2)
Structure type be circular elongated bar when, support construction (3) can be midfoot support to the supporting way of oscillator stiffness structure (2)
Or close to midfoot support.
4. according to claim 2 for constructing the Frequency Adjustable locally resonant structural unit of acoustic metamaterial, feature exists
In: when the regulating device being arranged on the oscillator stiffness structure (2) is sliding slot, the position of sliding slot is positioned away from support, vibration
Protonatomic mass structure is correspondingly arranged on cooperation slide bar on (1)；When the regulating device being arranged in oscillator stiffness structure (2) is screw thread, spiral shell
The position of line is positioned away from support, and is correspondingly arranged on matching thread on oscillator quality structure (1).
5. according to claim 1 for constructing the Frequency Adjustable locally resonant structural unit of acoustic metamaterial, feature exists
In: the Frequency Adjustable locally resonant structural unit can be simple oscialltor form or discrete distribution or stack the more of parallel connection
Oscillator form.
6. according to claim 1 for constructing the Frequency Adjustable locally resonant structural unit of acoustic metamaterial, feature exists
In: the oscillator quality structure (1) can be made of steel, copper, stone material, magnet, organic glass or composite material, laminate, institute
Stating oscillator stiffness structure (2), support construction (3) can be by the non-gold such as the metal materials such as steel, aluminium, copper or organic glass, PVC, timber
Belong to material or composite material, laminate are made.
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Cited By (4)
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| CN110599994A (en) * | 2019-09-24 | 2019-12-20 | 哈尔滨工程大学 | Acoustic metamaterial beam structure with X-shaped vibrators |
| CN110725471A (en) * | 2019-10-22 | 2020-01-24 | 哈尔滨工程大学 | Variable cross-section acoustic metamaterial beam with two-degree-of-freedom local resonance unit |
| CN114345674A (en) * | 2022-01-17 | 2022-04-15 | 中国人民解放军国防科技大学 | Mass amplification type micro-vibrator unit and metamaterial structure based on same |
| WO2022247730A1 (en) * | 2021-05-25 | 2022-12-01 | 华为技术有限公司 | Vibration suppression assembly and preparation method therefor, electric drive system, and vehicle |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110599994A (en) * | 2019-09-24 | 2019-12-20 | 哈尔滨工程大学 | Acoustic metamaterial beam structure with X-shaped vibrators |
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| CN110725471A (en) * | 2019-10-22 | 2020-01-24 | 哈尔滨工程大学 | Variable cross-section acoustic metamaterial beam with two-degree-of-freedom local resonance unit |
| CN110725471B (en) * | 2019-10-22 | 2021-04-20 | 哈尔滨工程大学 | Variable cross-section acoustic metamaterial beam with two-degree-of-freedom local resonance unit |
| WO2022247730A1 (en) * | 2021-05-25 | 2022-12-01 | 华为技术有限公司 | Vibration suppression assembly and preparation method therefor, electric drive system, and vehicle |
| CN114345674A (en) * | 2022-01-17 | 2022-04-15 | 中国人民解放军国防科技大学 | Mass amplification type micro-vibrator unit and metamaterial structure based on same |
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| CN109801617B (en) | 2020-12-29 |
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