CN108119588A - A kind of low frequency wideband vibration suppression structure based on binary cycle forbidden band characteristic - Google Patents
A kind of low frequency wideband vibration suppression structure based on binary cycle forbidden band characteristic Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F7/00—Vibration-dampers; Shock-absorbers
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Abstract
The present invention relates to a kind of low frequency wideband vibration suppression structures based on binary cycle forbidden band characteristic, belong to mechanical oscillation and field of noise control, particularly Aeronautics and Astronautics and Ship Vibration noise control technique field.Vibration suppression structure is combined by the identical cell element cycle, wherein single cell element includes four-layer structure, is from bottom to top followed successively by homogeneous associated layer, cycle laminboard layer, homogeneous restraint layer and homogeneous superficial layer.The cycle laminboard layer of the single cell element of structure is made of the material of two kinds of materials of A, B, through hole is opened up respectively at the laminboard layer center that A materials and B materials are formed, a locally resonant unit is separately installed in one through hole and locally resonant unit is connected with intermediate mass elements by upper and lower two spring elements and formed, homogeneous restraint layer of the two of which spring element respectively with the homogeneous associated layer of downside and upside is connected.Cycle vibration suppression structure provided by the present invention can generate inhibition of vibration in low frequency wide frequency range, help to solve the problems, such as that existing vibration suppression technology is poor in low frequency inhibition of vibration.
Description
Technical field
The present invention relates to a kind of low frequency wideband vibration suppression structures based on binary cycle forbidden band characteristic, belong to mechanical oscillation and noise
Control field, particularly Aeronautics and Astronautics and Ship Vibration noise control technique field.
Background technology
Mechanical structure can generate vibration after being activated, this is a kind of universal physical phenomenon.Although vibration can be
The mankind utilize and bring economic benefit, but in many cases, vibration can cause to seriously endanger.In aviation field, knot is reduced
The vibration of structure and then reduction interior noise can improve the riding comfort of passenger.In space industry, rocket or guided missile are emitting
Or huge external applied load during working condition can cause the judder of structure, rocket can be improved by efficiently reducing structural vibration
The guidance accuracy of job security and guided missile.In addition, in field of ship engineering, the structural vibration of submarine navigation device is reduced, is controlled
Mechanical wave processed in the structure propagate and and then reduce aircraft noise radiation, the probability arrived by enemy's sonar contact can be reduced
And realize good Stealth Fighter, it is of great advantage to promoting marine military capability of the country.Therefore, it is each in Aeronautics and Astronautics and ship etc.
Field, vibration control already become one it is particularly significant the technical issues of.
For the structural vibration problem in each engineering field, some more mature vibration isolation, absorbing, resistances have been gradually formed
The traditional technology and method of the control structures such as Buddhist nun's vibration damping vibration, good inhibition of vibration is obtained in medium-high frequency.It is however traditional
Vibration control technology is not good enough in low frequency inhibition of vibration.Although active vibration suppression technology can solve low frequency spectrum lines vibration to a certain extent
Control problem, however vibrated at present for low frequency wideband helpless.Therefore, how control structure is in low frequency wide frequency range
Vibration be increasingly becoming the key issue in vibration control field.
Periodic structure is combined by the identical unit cycle, and it is special that periodic distribution makes structure show band gap filtering
Property, i.e. the elastic wave outside bandgap frequency scope can be with normal propagation, and the elastic wave in the range of bandgap frequency then can not be free
It propagates, is suppressed effect.Therefore, the band gap properties of periodic structure can provide a kind of new method and think of for vibration control
Road.By rationally designing the cell parameter of periodic structure, band gap can be regulated and controled in low-frequency range, and then using periodic structure
Solve the problems, such as that low-frequency vibration controls.The band gap mechanism of periodic structure generally can be divided into Bragg diffraction type and local resonance type,
Wavelength wherein corresponding to the bandgap frequency of Bragg diffraction type and lattice constant are in same magnitude, and the band of locally resonant type
Wavelength corresponding to gap frequency can be more than lattice constant.Therefore the binary cycle knot for being combined two kinds of band gap mechanism can be designed
Structure adjusts the bandgap frequency scope of Bragg diffraction type periodic structure and the bandgap frequency scope of locally resonant type periodic structure
In the different frequency range of low frequency, then low frequency wideband band gap, and then controllable vibration of the structure in low frequency wide frequency range can be obtained,
Solve low frequency wideband vibration control problem.
The content of the invention
The purpose of the present invention is directed to a kind of for the reduction engineering field elastic construction vibration in low frequency wide frequency range
Vibration suppression structure, it is main to be reached using the laying cycle sandwich on by vibration suppression structure and cycle locally resonant unit bi-period structure
To the purpose of vibration and noise reducing.
To achieve the above object, the present invention adopts the following technical scheme that：
A kind of low frequency wideband vibration suppression structure based on binary cycle forbidden band characteristic, is combined by the identical cell element cycle, wherein
Single cell element includes four-layer structure, is from bottom to top followed successively by homogeneous associated layer, cycle laminboard layer, homogeneous restraint layer and homogeneous surface
Layer.The cycle laminboard layer of the single cell element of structure is made of the material of two kinds of materials of A, B, in the folder that A materials and B materials are formed
Sandwich layer center opens up through hole respectively, and a locally resonant unit is separately installed in a through hole.The locally resonant unit is by upper
Lower two spring elements are connected composition with intermediate mass elements, the two of which spring element homogeneous associated layer with downside respectively
It is connected with the homogeneous restraint layer of upside.
The low frequency wideband vibration suppression structure based on binary cycle forbidden band characteristic, homogeneous associated layer, cycle laminboard layer and homogeneous
The material of superficial layer is visco-elastic damping material, and the material of homogeneous restraint layer is elastic metallic material.
The low frequency wideband vibration suppression structure based on binary cycle forbidden band characteristic, laminboard layer A and laminboard layer B in cycle laminboard layer
Different length dimensions can be selected along cycle direction, and be located at laminboard layer A and two locally resonants in laminboard layer B through holes respectively
The resonant frequency of unit may be set to different frequencies.
The low frequency wideband vibration suppression structure based on binary cycle forbidden band characteristic, spring element in locally resonant unit can be with
For widely used spring in traditional sense, or the structure for providing resilient support of homogeneous soft material composition.
Compared with prior art, the present invention main feature and helpfulness effect are as follows：
The characteristic of period profile is presented in vibration suppression structure proposed by the present invention, and cycle laminboard layer can generate Bragg diffraction band
Gap, cycle locally resonant unit can generate locally resonant band gap.In band gap, the vibratory response of structure can obtain effective inhibition.
By reasonably selecting the size and material parameter of cell element, the cycle vibration suppression structure bandgap frequency in the present invention can be regulated and controled to low
Frequency range, and Bragg diffraction band gap is made to be in locally resonant band gap in the range of different frequency, reach low frequency wideband inhibition of vibration.
In addition, homogeneous associated layer, cycle laminboard layer and homogeneous superficial layer containing damping and the locally resonant unit containing damping have
Beneficial to further widening vibration suppression bandgap frequency scope.The invention helps to solve existing vibration suppression technology in low frequency inhibition of vibration difference
Problem.
Description of the drawings
Fig. 1：The single cell element schematic diagram of cycle vibration suppression structure.
Fig. 2：The single cell element A-A diagrammatic cross-sections of cycle vibration suppression structure.
Fig. 3：Cycle vibration suppression structure scheme of installation (explosive view).
Fig. 4：Cycle vibration suppression structural matrix excitation region and the Mean Oscillation response in matrix pick-up area compare.
In figure：1-homogeneous associated layer；2-cycle laminboard layer；21-laminboard layer A；22-laminboard layer B；23-laminboard layer A
Interior through hole A；The spring element A of 24-locally resonant unit A；The mass elements A of 25-locally resonant unit A；26-sandwich
Through hole B in layer B；The spring element B of 27-locally resonant unit B；The mass elements B of 28-locally resonant unit B.3-even
Matter restraint layer；4-homogeneous superficial layer；5-by vibration suppression basal body structure；51-by vibration suppression basal body structure excitation region；52-by vibration suppression
Basal body structure pick-up area.
Specific embodiment
The present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings.
Cycle vibration suppression structure in the present invention is multi-layer compound structure, to be attached to by vibration suppression basal body structure (5), is come
It reduces by the vibration of vibration suppression basal body structure (5).The vibration suppression structure can be seen as flat by single cell element edge as shown in Figures 1 and 2
The face both direction cycle is combined.Cycle vibration suppression structure on the whole by homogeneous associated layer (1), cycle laminboard layer (2), it is homogeneous about
Beam layer (3) and homogeneous superficial layer (4) composition.Homogeneous associated layer (1) by vibration suppression basal body structure (5) with being directly connected to, to paste
It is attached to by vibration suppression basal body structure (5).Cycle laminboard layer (2) include there are two types of different sandwich materials and two kinds it is identical (or
It is different) locally resonant unit, to be respectively formed Bragg diffraction band gap and locally resonant band gap, to reduce structure in band gap
Interior vibration.Homogeneous restraint layer (3) selects metal material (steel or aluminium etc.), its effect is：On the one hand to cycle laminboard layer
It carries out constraint and forms constrained damping structure, on the other hand can improve the anti-pressure ability of cycle vibration suppression structure.Homogeneous superficial layer (4)
Using visco-elastic damping material, its effect is：On the one hand the damping of structure can be increased and then reduce structural vibration, it is another
Aspect can protect the metal material of homogeneous restraint layer (3) when applying under water in environment, prevent corrosion.The vibration suppression knot
Using solid gum or liquid glue secure bond between each layer of structure, prevent interlayer slip from generating, wherein the homogeneous associated layer of lower side
(1) and it is connected directly between vibration suppression basal body structure, equally uses solid gum or liquid glue secure bond.In cycle laminboard layer A
(21) through hole (23 and 26) is opened up with the center of cycle laminboard layer B (22), to installation period locally resonant unit.Pass through
The quality (25 and 28) of locally resonant unit or the elastic element spring rate (24 and 27) of locally resonant unit are adjusted, it can be by office
The band gap of domain resonating member regulates and controls in low-frequency range, and two kinds of locally resonant units can show different forbidden band frequencies.
The vibration suppression mechanism of cycle vibration suppression structure mainly includes the vibration suppression of Bragg diffraction band gap, locally resonant band gap in the present invention
Three aspects of vibration suppression and damping structure vibration suppression.Specific vibration suppression structural parameters are chosen below, to further illustrate this vibration suppression knot
Inhibition of vibration of the structure in low-frequency range.It is 1600mm × 300mm × 4mm by the size of vibration suppression basal body structure (5), material is
Steel.Cycle vibration suppression structure is altogether comprising 6 cell elements, wherein the length of single cell element is 200mm, wherein width 300mm, laminboard layer
The equal length of A (21) and laminboard layer B (22), is 100mm.Each layer thickness be followed successively by from bottom to top as shown in Figure 1 1mm,
8mm, 1mm and 1mm.The radius of cycle laminboard layer inner via hole A (23) and through hole B (26) is 25mm, mass elements A (25) and B
(28) and the radius of spring element A (24) and B (27) is 20mm.The height of mass elements (25 and 28) be 4mm, spring element
The height of part (24 and 27) is 2mm.Mass elements (25 and 28) selection be lead, gross mass 58.3g；Spring element A (24) and B
(27) equivalent spring rigidity is set to 23065.1Pa and 70576.5Pa.Homogeneous associated layer (1) in cycle vibration suppression structure
It is consistent with homogeneous superficial layer (4) selection, for viscoelastic material, Elastic Modulus 107Pa, density 1100kg/m3, loss
The factor is 0.2.The material of homogeneous restraint layer (3) is aluminium.Laminboard layer A (21) is KT foamed materials, and elasticity modulus is 2 × 105Pa,
Density is 58kg/m3, fissipation factor 0.2.Laminboard layer B (22) is nitrile rubber, and elasticity modulus is 3 × 108Pa, density
For 1780kg/m3, fissipation factor 0.2.
Fig. 3 show the overall structure exploded perspective view of additional cycle vibration suppression structure, and wherein cycle vibration suppression structure is mounted on
By the intermediate region (being known as vibration suppression area) of vibration suppression basal body structure (5), vibration suppression area does not install vibration suppression structure in the left and right sides, wherein left
Side is known as matrix excitation region (51) and is applied with the excitation of unit line power, and right side is known as matrix pick-up area (52).It is encouraged by Fig. 4 matrixes
Area (51) comparison corresponding to the Mean Oscillation in matrix pick-up area (52) is as it can be seen that elastic wave passes through vibration suppression block transitive by excitation region (51)
Very big attenuation is obtained in 80Hz~285Hz frequency ranges after to pick-up area (52), that is, vibrates and is obtained in low frequency wide frequency range
Effective inhibition was obtained, shows that the cycle vibration suppression structure in the present invention shows good low frequency wideband vibration suppression characteristic.
Claims (4)
1. a kind of low frequency wideband vibration suppression structure based on binary cycle forbidden band characteristic, it is characterised in that：The structure is by identical cell element week
Phase is combined, wherein single cell element includes four-layer structure, is from bottom to top followed successively by homogeneous associated layer (1), cycle laminboard layer
(2), homogeneous restraint layer (3) and homogeneous superficial layer (4), the cycle laminboard layer of the single cell element of structure is by A (21) and B (22) two
The material composition of kind material opens up through hole (23 and 26) respectively at the laminboard layer center that A materials (21) and B materials (22) are formed,
A locally resonant unit is separately installed in one through hole and the locally resonant unit by upper and lower two spring elements (24 with
27) and intermediate mass elements (25 and 28) are connected composition, and two of which spring element (24 and 27) is homogeneous with downside respectively
Associated layer (1) and the connection of the homogeneous restraint layer (3) of upside.
2. the low frequency wideband vibration suppression structure according to claim 1 based on binary cycle forbidden band characteristic, homogeneous associated layer (1),
The material of cycle laminboard layer (2) and homogeneous superficial layer (4) is visco-elastic damping material, and the material of homogeneous restraint layer (3) is bullet
Property metal material.
3. the low frequency wideband vibration suppression structure according to claim 1 or 2 based on binary cycle forbidden band characteristic, in cycle laminboard layer
Different length dimensions can be selected along cycle direction from laminboard layer B (22) by laminboard layer A (21), and be located at laminboard layer A (21) respectively
Different frequencies are may be set to from the resonant frequency of two locally resonant units in laminboard layer B (22) through hole.
4. the low frequency wideband vibration suppression structure according to claim 3 based on binary cycle forbidden band characteristic, in locally resonant unit
Spring element (24 and 27) can be widely used spring in traditional sense, or homogeneous soft material composition carries
For the structure of resilient support.
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Cited By (10)
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| CN109268418A (en) * | 2018-10-26 | 2019-01-25 | 西南交通大学 | A kind of weather-proof durability all-metal multiple spot frequency-selecting vibration suppression structure |
| CN110594331A (en) * | 2019-09-19 | 2019-12-20 | 哈尔滨工程大学 | Hierarchical periodic structure metamaterial beam suitable for multi-frequency-band vibration reduction |
| CN111043239A (en) * | 2019-12-25 | 2020-04-21 | 西北工业大学 | Super-elastic low Poisson's ratio distributed cell element vibration suppression structure |
| CN111505127A (en) * | 2020-03-30 | 2020-08-07 | 哈尔滨工程大学 | Experimental device for surrounding type local resonance light dot matrix sandwich plate structure |
| CN111503203A (en) * | 2020-03-30 | 2020-08-07 | 哈尔滨工程大学 | Experimental device for cladding type local resonance light dot matrix sandwich panel structure |
| CN112626931A (en) * | 2020-12-22 | 2021-04-09 | 中国铁路设计集团有限公司 | Vibration-damping roadbed with periodic cushion layer for spot paving |
| CN112747060A (en) * | 2020-12-30 | 2021-05-04 | 西北工业大学 | Quasi-periodic local resonance structure for widening vibration reduction frequency band |
| CN113761648A (en) * | 2021-08-05 | 2021-12-07 | 同济大学 | Low-frequency vibration-damping double-layer corrugated superstructure |
| CN115473455A (en) * | 2022-09-02 | 2022-12-13 | 哈尔滨工程大学 | Vibration damping and power generation dual-function device based on symmetrical multi-layer piezoelectric metamaterial |
| CN113761648B (en) * | 2021-08-05 | 2024-05-31 | 同济大学 | Low-frequency vibration reduction double-layer corrugated superstructure |
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| CN109268418A (en) * | 2018-10-26 | 2019-01-25 | 西南交通大学 | A kind of weather-proof durability all-metal multiple spot frequency-selecting vibration suppression structure |
| CN109268418B (en) * | 2018-10-26 | 2024-05-10 | 西南交通大学 | Weather-proof durable all-metal multipoint frequency-selecting vibration-inhibiting structure |
| CN110594331A (en) * | 2019-09-19 | 2019-12-20 | 哈尔滨工程大学 | Hierarchical periodic structure metamaterial beam suitable for multi-frequency-band vibration reduction |
| CN111043239A (en) * | 2019-12-25 | 2020-04-21 | 西北工业大学 | Super-elastic low Poisson's ratio distributed cell element vibration suppression structure |
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| CN111505127A (en) * | 2020-03-30 | 2020-08-07 | 哈尔滨工程大学 | Experimental device for surrounding type local resonance light dot matrix sandwich plate structure |
| CN111503203A (en) * | 2020-03-30 | 2020-08-07 | 哈尔滨工程大学 | Experimental device for cladding type local resonance light dot matrix sandwich panel structure |
| CN112626931A (en) * | 2020-12-22 | 2021-04-09 | 中国铁路设计集团有限公司 | Vibration-damping roadbed with periodic cushion layer for spot paving |
| CN112747060A (en) * | 2020-12-30 | 2021-05-04 | 西北工业大学 | Quasi-periodic local resonance structure for widening vibration reduction frequency band |
| CN113761648A (en) * | 2021-08-05 | 2021-12-07 | 同济大学 | Low-frequency vibration-damping double-layer corrugated superstructure |
| CN113761648B (en) * | 2021-08-05 | 2024-05-31 | 同济大学 | Low-frequency vibration reduction double-layer corrugated superstructure |
| CN115473455A (en) * | 2022-09-02 | 2022-12-13 | 哈尔滨工程大学 | Vibration damping and power generation dual-function device based on symmetrical multi-layer piezoelectric metamaterial |
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