CN108374858A - One kind being based on the adjustable simple substance phonon crystal vibration isolator of Stress stiffening effect band gap - Google Patents
One kind being based on the adjustable simple substance phonon crystal vibration isolator of Stress stiffening effect band gap Download PDFInfo
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- CN108374858A CN108374858A CN201810079465.9A CN201810079465A CN108374858A CN 108374858 A CN108374858 A CN 108374858A CN 201810079465 A CN201810079465 A CN 201810079465A CN 108374858 A CN108374858 A CN 108374858A
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- phonon crystal
- band gap
- simple substance
- vibration
- vibration isolator
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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
Abstract
The invention discloses one kind being based on the adjustable simple substance phonon crystal vibration isolator of Stress stiffening effect band gap, including top base, bottom base, hub and DC power supply；Several vibration isolation phonon crystal support shafts are laid between top base and bottom base, it is set with one group of phonon crystal unit block in every vibration isolation phonon crystal support shaft, it is removably equipped with the opposite electromagnet of a pair of of homopolarity on each phonon crystal unit, electromagnet on same group of phonon crystal unit is serially connected into a closed circuit, every closed circuit ring is connect by conducting wire with hub, and hub is connect with DC power supply.The band gap that the present invention can solve current phonon crystal vibration isolator is unadjustable, and preparation process is complicated, the relatively narrow problem of isolation frequency range.
Description
Technical field
The invention belongs to vibration isolation technique fields, are related to a kind of vibration isolator, and in particular to one kind being based on Stress stiffening effect band
The adjustable simple substance phonon crystal vibration isolator of gap.
Background technology
In such as machine-building, aerospace and Other Engineering field, all there is various vibration problems.It is excessive to have
Evil vibration frequently can lead to structure, fatigue rupture or failure occur for equipment, for the higher tip of environmental requirement is equipped more
It is such.Currently, two classes can be broadly divided by reducing the method for mechanical oscillatory structure：When control vibration source, that is, reduce vibration with
The generation of noise, this aspect can be improved the methods of accuracy of manufacture, and reduction installation error and come by Optimal Structure Designing
It realizes；Second is that taking the measures such as isolation, decaying to the vibration and noise generated, it is made to be weakened in communication process, this
On the one hand it can be realized by adding damping system.However existing method can only be such that vibration is weakened by various means,
Make to influence within the scope of we require caused by it, and can not eliminate.
In recent years the phonon crystal material occurred has the vibration characteristics not available for traditional conventional material, i.e., so-called bullet
Property wavestrip gap.When elastic wave is propagated in phonon crystal, due to the modulating action by its intercycle property structure, only feature
Frequency, which is in a certain range of elastic wave, smoothly to be propagated, and the elastic wave of other frequencies can be obstructed.Phonon crystal
Elastic wave band gaps it is significant to fields such as equipment configuration inside vibration damping, noise-reducing designs, especially in conventional damping material
The application of the range of efficiency cannot be played.Therefore, this kind of new material is researched and developed in structural vibration reduction, sound insulation and novel acoustic device
Etc. have broad application prospects.
However, traditional more material phonon crystal preparation methods are complicated, and bandgap range is determined by initial designs, is not had
Standby controllability can not equip for delicate tip and provide suitable micro-vibration working environment, therefore largely limit it
Using.
Invention content
The purpose of the present invention is to provide one kind being based on the adjustable simple substance phonon crystal vibration isolator of Stress stiffening effect band gap,
The band gap that can solve current phonon crystal vibration isolator is unadjustable, and preparation process is complicated, the relatively narrow problem of isolation frequency range.
The present invention is to be achieved through the following technical solutions：
The present invention discloses a kind of based on the adjustable simple substance phonon crystal vibration isolator of Stress stiffening effect band gap, including upper base
Seat, bottom base, hub and DC power supply；
Several vibration isolation phonon crystal support shafts are laid between top base and bottom base, in every vibration isolation phonon crystal branch
It is set with one group of phonon crystal unit block on support axis, it is opposite to be removably equipped with a pair of of homopolarity on each phonon crystal unit
Electromagnet, the electromagnet on same group of phonon crystal unit is serially connected into a closed circuit, every closed circuit ring
It is connect with hub by conducting wire, hub is connect with DC power supply.
Preferably, it is equipped with vibration isolation undersetting on bottom base top, the upper end of every vibration isolation phonon crystal support shaft is inserted into
On top base, lower end is connect with vibration isolation undersetting；It is respectively provided with compression end cap above top base and below vibration isolation undersetting.
Preferably, further include that lid closes upper covering on top base, lid closes the lower covering on bottom base, and with upper illiteracy
The side skin that skin is connected with lower covering, side skin, upper covering and lower covering are coated on vibration isolator periphery together.
Preferably, the lower end of vibration isolation phonon crystal support shaft and vibration isolation undersetting transition coordinate, the compression end cap of top with
Top base is glued, and compression end cap and the vibration isolation undersetting of lower section are glued.
Preferably, the positive and negative anodes of every closed circuit ring are connect with the binding post being distributed on top base, pass through binding post
Outer conductor is connected with inside conductor.
Preferably, each phonon crystal unit includes that the level-one being set in from the bottom to top in vibration isolation phonon crystal support shaft dissipates
Beam and second-order scattering body are angularly evenly distributed with four resonance cantilevers in level-one scatterer, and the opposite electromagnet of two groups of homopolarities corresponds to
It is set on this four resonance cantilevers.
It is further preferred that each locally resonant type phonon crystal unit cell by nonferromugnetic material by being machined or increasing
Manufacture process is made.
It is further preferred that the nonferromugnetic material is aluminium, copper or engineering plastics etc..
It is further preferred that being sized to adjust the opposite electricity for being installed on resonance cantilever end of homopolarity by adjusting input current
Magnetic field intensity between magnet, changes unit internal stress field, and vibration control equation is as follows：
[K+Kσ]-ω2[M]=[0]；
In formula, K is structural stiffness matrix, and M is mass matrix, and ω is circular frequency, KσFor stress additional stiffness battle array.
Preferably, the shape of top base and bottom base be square, regular hexagon or circle.
Compared with prior art, the present invention has technique effect beneficial below：
It is disclosed by the invention to be based on the adjustable simple substance phonon crystal vibration isolator of Stress stiffening effect band gap, it can realize to band
The control of gap frequency range internal vibration, the vibration propagated along phonon crystal unit period direction are inputted by top base, utilize office
The band gap properties of domain resonance type phonon crystal unit cell so that certain frequency range internal vibration is attenuated, total by local later
The vibration of vibration shape phonon crystal component, which is attenuated, is again spread out of vibration by bottom base.Its advantage is embodied in：
1, by the bandgap of phonon crystal, effective control to bandgap frequency range internal vibration is realized；
2, the Stress stiffening effect for making full use of structure, realizes the adjusting of phonon crystal band gap, can be by controlling electricity
The size of current of magnet changes phonon crystal unit internal stress field, to realize the adjusting to isolation frequency range, expands
The vibration isolation range of phonon crystal vibration isolator；
3, overall structure of the present invention is simple, easily manufactured, and vibration isolating effect protrudes, and has wide range of applications, and is suitable for various essences
The novel acoustics device such as various platform structures and elastic wave channel switch such as close instrument supporting table, vibration-isolating platform.
Description of the drawings
Fig. 1 is the integral installation distribution structure schematic diagram of the present invention；
Fig. 2 is the integral installation distribution structure schematic diagram removed after side skin, upper covering and lower covering；
Fig. 3 is the local detail schematic diagram of Fig. 2；
Fig. 4 is that closed circuit ring passes through outer conductor and hub and DC power supply connection diagram；
Fig. 5 is that the present invention uses locally resonant type phonon crystal vibrator component assembling schematic diagram；
Fig. 6 is the locally resonant type phonon crystal single cell structure schematic diagram of the present invention.
Wherein, 1 is top base；2 be upper covering；3 be side skin；4 be lower covering；5 be compression end；6 is brilliant for vibration isolation phonon
Body support shaft；7 be binding post；8 be vibration isolation undersetting；9 be bottom base；10 be locally resonant type phonon crystal component；11 be office
Domain resonance type phonon crystal unit cell；12 be resonance cantilever；13-1 is level-one scatterer；13-2 is second-order scattering body；14 be electromagnetism
Iron；15 be outer conductor；16 be inside conductor；17 be hub；18 be DC power supply.
Specific implementation mode
With reference to specific embodiment, the present invention is described in further detail, it is described be explanation of the invention and
It is not to limit.
It is disclosed by the invention a kind of based on the adjustable simple substance phonon crystal vibration isolation of Stress stiffening effect band gap referring to Fig. 1~6
Device, including top base 1, bottom base 9, hub 17 and DC power supply 18；Several are laid between top base 1 and bottom base 9
Vibration isolation phonon crystal support shaft 6 is set with one group of locally resonant type phonon crystal group in every vibration isolation phonon crystal support shaft 6
Part 10, every group of locally resonant type phonon crystal component 10 are made of several locally resonant type phonon crystal unit cells 11, Mei Geju
The opposite electromagnet 14 of a pair of of homopolarity, same group of locally resonant type are removably equipped on domain resonance type phonon crystal unit cell 11
Electromagnet 14 on phonon crystal component 10 is serially connected into a closed circuit by inside conductor 16, and every closed circuit ring is just
Cathode is connect with top base binding post 7 is distributed in, and outer conductor 15 is connected with inside conductor 16 by binding post 7, every closure
Circuit ring is connect by outer conductor 15 with hub 17 in outside, and hub 17 is connect with DC power supply 18.
It is equipped with vibration isolation undersetting 8 on 9 top of bottom base, the upper end of every vibration isolation phonon crystal support shaft 6 is inserted into base
On seat 1, lower end is connect with vibration isolation undersetting 8；It is respectively provided with above top base 1 and below vibration isolation undersetting 8 and compresses end cap 5, also
Include that lid closes upper covering 2 on top base 1, lid closes the lower covering 4 on bottom base 9, and with upper covering 2 and lower covering 4
The side skin 3 of connection, side skin 3 coat vibration isolator periphery.Match with 8 transition of vibration isolation undersetting the lower end of phonon crystal support shaft 6
It closes, compression end cap 5 and the top base 1 of top are glued, and compression end cap 5 and the vibration isolation undersetting 8 of lower section are glued.
Referring to Fig. 3, every group of locally resonant type phonon crystal component 10 includes multiple locally resonant type phonon crystal unit cells
11, each locally resonant type phonon crystal unit cell 11 has certain Complicated Spatial Structure；If vibration isolation phonon crystal support column 6 with
The locally resonant type phonon crystal unit cell 11 of dry periodic arrangement is detachably connected by screw.Referring to Fig. 6, each local is total
Vibration shape phonon crystal unit cell 11 includes that the level-one scatterer 13-1 being set in from the bottom to top in phonon crystal support shaft 6 and two level dissipate
Beam 13-2 is angularly evenly distributed with four resonance cantilevers 12 in level-one scatterer 13-1, and the opposite electromagnet 14 of two groups of homopolarities corresponds to
It is set on this four resonance cantilevers 12.For each locally resonant type phonon crystal unit cell 11, can be divided into according to functionality soft
Spend big coupling part, mass concentration resonance part.
Each locally resonant type phonon crystal unit cell 11 is passed through by nonferromugnetic material of the same race such as aluminium, copper, engineering plastics etc.
It is prepared by the means such as mechanical processing, increasing material manufacturing.Vibration isolation phonon crystal support shaft 6 with locally resonant type phonon crystal unit cell 11 by making
It is made of nonferromugnetic material of the same race, such as aluminium, copper, engineering plastics.
Preferably, the shape of top base 1 and bottom base 9 be square, regular hexagon or circle.
Input current size is adjusted, homopolarity can be adjusted and be installed on 12 14 magnetic fields of end each group electromagnet of resonance cantilever relatively
Intensity, changes unit internal stress field, i.e., so-called Stress stiffening effect considers the following institute of the vibration control equation of the effect
Show：
[K+Kσ]-ω2[M]=[0] (1)
In formula：K is structural stiffness matrix, and M is mass matrix, and ω is circular frequency, KσFor stress additional stiffness battle array.Such as above formula
Shown, unit internal stress can generate additional stiffness to structure, influence the vibration characteristics of locally resonant type phonon crystal unit cell,
It changes so as to cause the position of energy band and size of phonon crystal.
By taking photosensitive resin as an example, (the photosensitive resin when unit cell resonance cantilever bears the equivalent tensile stress that size is 12.5MPa
Tensile strength is 51MPa), preceding second order band gap width amplification reaches 15% or more；Single order band gap center frequency position rises
410.5Hz, second order band gap center frequency rise 203.5Hz.
Referring to Fig. 4, after each circuit positive and negative terminal is connect and is powered with hub 17, each pair of electromagnet generation can be made to repel each other
Magnetic field force, the resonance cantilever being connect with electromagnet are stretched, and are answered to make to generate inside locally resonant type phonon crystal unit cell
The field of force.Due to the Stress stiffening effect of structure, phonon crystal band gap is lifted.Magnetic field is controlled by changing input current size
Freely adjusting to isolation frequency range of the present invention may be implemented in power.
In conclusion the control to bandgap frequency range internal vibration may be implemented in the vibration isolator of the present invention, along phonon crystal
The vibration that period direction is propagated is inputted by top base, utilizes the band gap properties of phonon crystal so that in certain frequency range
Vibration is attenuated, and is attenuated by the vibration of vibration isolation phonon crystal component is again spread out of vibration by bottom base later.The present invention
In phonon crystal unit piece can be prepared by any kind nonferromugnetic material, utilize resonance cantilever in unit to replace polynary sound
Clad, scatterer structure in sub- crystal, due to preparing bill of materials one, without the concern for different constituent elements in polynary phonon crystal
Between material connection combination, so to manufacturing process require substantially reduce.The present invention can solve current phonon crystal every
Shake device band gap it is unadjustable, preparation process is complicated, the relatively narrow problem of isolation frequency range.
Claims (10)
1. one kind being based on the adjustable simple substance phonon crystal vibration isolator of Stress stiffening effect band gap, which is characterized in that including top base
(1), bottom base (9), hub (17) and DC power supply (18)；
Several vibration isolation root phonon crystal support shafts (6) are laid between top base (1) and bottom base (9), in every vibration isolation phonon
One group of locally resonant type phonon crystal component (10), every group of locally resonant type phonon crystal group are set on Crystal-support axis (6)
Part (10) is made of several locally resonant type phonon crystal unit cells (11), on each locally resonant type phonon crystal unit cell (11)
Removably it is equipped with the opposite electromagnet of a pair of of homopolarity (14), the electricity on same group of locally resonant type phonon crystal component (10)
Magnet (14) is serially connected into a closed circuit, and every closed circuit ring is connect by outer conductor (15) with hub (17),
Hub (17) is connect with DC power supply (18).
2. according to claim 1 be based on the adjustable simple substance phonon crystal vibration isolator of Stress stiffening effect band gap, feature
It is, is equipped with vibration isolation undersetting (8) on bottom base (9) top, the upper end of every vibration isolation phonon crystal support shaft (6) is inserted into
On pedestal (1), lower end is connect with vibration isolation undersetting (8)；It is respectively provided with pressure above top base (1) and below vibration isolation undersetting (8)
Tight end cap (5).
3. according to claim 2 be based on the adjustable simple substance phonon crystal vibration isolator of Stress stiffening effect band gap, feature
Be, further include that lid closes upper covering (2) on top base (1), lid closes the lower covering (4) on bottom base (9), and with it is upper
The side skin (3) of covering (2) and lower covering (4) connection, side skin (3) and upper covering (2), lower covering (4) be coated on together every
Shake device periphery.
4. according to claim 2 be based on the adjustable simple substance phonon crystal vibration isolator of Stress stiffening effect band gap, feature
Be, the lower end of vibration isolation phonon crystal support shaft (6) coordinates with vibration isolation undersetting (8) transition, the compression end cap (5) of top with it is upper
Pedestal (1) is glued, and compression end cap (5) and the vibration isolation undersetting (8) of lower section are glued.
5. according to claim 1 be based on the adjustable simple substance phonon crystal vibration isolator of Stress stiffening effect band gap, feature
It is, the positive and negative anodes of every closed circuit ring are connect with the binding post (7) being distributed on top base (1), will by binding post (7)
Outer conductor (15) is connected with inside conductor (16).
6. according to claim 1 be based on the adjustable simple substance phonon crystal vibration isolator of Stress stiffening effect band gap, feature
It is, each locally resonant type phonon crystal unit cell (11) includes being set in from the bottom to top in vibration isolation phonon crystal support shaft (6)
Level-one scatterer (13-1) and second-order scattering body (13-2), level-one scatterer (13-1) angularly be evenly distributed with four resonance cantilevers
(12), the opposite electromagnet (14) of two groups of homopolarities is corresponding is set on this four resonance cantilevers (12).
7. according to claim 6 be based on the adjustable simple substance phonon crystal vibration isolator of Stress stiffening effect band gap, feature
It is, each locally resonant type phonon crystal unit cell (11) passes through mechanical processing or increasing material manufacturing technique system by nonferromugnetic material
At.
8. according to claim 7 be based on the adjustable simple substance phonon crystal vibration isolator of Stress stiffening effect band gap, feature
It is, the nonferromugnetic material is aluminium, copper or engineering plastics.
9. according to claim 6 be based on the adjustable simple substance phonon crystal vibration isolator of Stress stiffening effect band gap, feature
It is, be sized to adjusting homopolarity by adjusting input current is installed between the electromagnet (14) that resonance cantilever (12) is held relatively
Magnetic field intensity, changes unit internal stress field, and vibration control equation is as follows：
[K+Kσ]-ω2[M]=[0]；
In formula, K is structural stiffness matrix, and M is mass matrix, and ω is circular frequency, KσFor stress additional stiffness battle array.
10. according to any one of claim 1~9 based on the adjustable simple substance phonon crystal of Stress stiffening effect band gap
Vibration isolator, which is characterized in that the shape of top base (1) and bottom base (9) is square, regular hexagon or circle.
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| CN201810079465.9A CN108374858B (en) | 2018-01-26 | 2018-01-26 | Elementary substance phonon crystal vibration isolator with adjustable band gap based on stress rigidization effect |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108999101A (en) * | 2018-08-28 | 2018-12-14 | 华东交通大学 | A kind of box beam bump leveller based on deficiency phonon crystal |
| CN109538674A (en) * | 2018-11-22 | 2019-03-29 | 中国船舶重工集团公司第七〇九研究所 | A kind of adjustable limiter in three-dimensional gap |
| CN111877058A (en) * | 2020-08-12 | 2020-11-03 | 中南大学 | Floating plate track vibration isolator device based on three-dimensional phononic crystal |
| CN112878219A (en) * | 2021-01-14 | 2021-06-01 | 西南大学 | Phononic crystal sound barrier with self-adaptive function |
| CN114704589A (en) * | 2022-04-21 | 2022-07-05 | 山东大学 | Local resonance type phononic crystal vibration reduction device and equipment |
| CN114992265A (en) * | 2022-06-20 | 2022-09-02 | 兰州交通大学 | Self-rotating phonon crystal structure and application thereof, and sound insulation and vibration isolation material |
| WO2024007357A1 (en) * | 2022-07-08 | 2024-01-11 | 天津大学 | Sensor phononic crystal vibration isolator for underwater vehicle |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111877058A (en) * | 2020-08-12 | 2020-11-03 | 中南大学 | Floating plate track vibration isolator device based on three-dimensional phononic crystal |
| CN112878219A (en) * | 2021-01-14 | 2021-06-01 | 西南大学 | Phononic crystal sound barrier with self-adaptive function |
| CN114704589A (en) * | 2022-04-21 | 2022-07-05 | 山东大学 | Local resonance type phononic crystal vibration reduction device and equipment |
| CN114992265A (en) * | 2022-06-20 | 2022-09-02 | 兰州交通大学 | Self-rotating phonon crystal structure and application thereof, and sound insulation and vibration isolation material |
| WO2024007357A1 (en) * | 2022-07-08 | 2024-01-11 | 天津大学 | Sensor phononic crystal vibration isolator for underwater vehicle |
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