CN208141824U - Beam-folding phonon crystal with wide cut low bandgap characteristic - Google Patents
Beam-folding phonon crystal with wide cut low bandgap characteristic Download PDFInfo
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- CN208141824U CN208141824U CN201820775479.XU CN201820775479U CN208141824U CN 208141824 U CN208141824 U CN 208141824U CN 201820775479 U CN201820775479 U CN 201820775479U CN 208141824 U CN208141824 U CN 208141824U
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Abstract
The utility model discloses a kind of beam-folding phonon crystal with wide cut low bandgap characteristic, including multiple primitive unit cells, multiple primitive unit cells constitute the phonon crystal in three-dimensional cube array distribution；The primitive unit cell includes 12 frames, 12 frames connect and compose a cube frame structure, the frame includes two folded beams and mass block, the first end of two folded beams is fixedly connected with the lateral surface of the mass block, the axis of two folded beams is overlapped, and passes through the center of the mass block.The utility model has the beam-folding phonon crystal of wide cut low bandgap characteristic by folded beam quality of connection block, reduces the coupling stiffness between mass block, is based on Local Resonance Mechanism, it is mobile to low frequency to be conducive to energy band band gap, and form broader energy band band gap.
Description
Technical field
The utility model relates to phonon crystal design field more particularly to a kind of foldings with wide cut low bandgap characteristic
Beam type phonon crystal.
Background technique
Phonon crystal refers to that material or structure with different acoustic characteristics are combined with each other, by periodical with sound wave band
The period composite material or structure of gap.When sound wave or vibrational excitation are by the periodic modulation of material or structure, may produce
Raw energy band band gap, the i.e. propagation of the sound wave of certain frequency range or vibration are suppressed or forbid.This characteristic of phonon crystal has
There is important engineering application value, has in terms of the new function materials such as vibration and noise reducing, passive sound insulation, acoustic filter
Broad application prospect.
The size of phonon crystal energy band band gap and frequency range locating for it are extremely important, the bigger and locating frequency of energy band band gap
Section is lower, and application value is higher, seeks the photonic crystal structure of low frequency wide cut energy band band gap, is always phonon crystal design
The emphasis of research.But from the current study, the energy band band gap frequency range for the photonic crystal structure that current research obtains is partially narrow
And it is in medium-high frequency frequency range mostly, it is still difficult to meet Practical Project demand, also limits the further engineer application of phonon crystal.
Therefore, the photonic crystal structure that researching and designing provides wide cut low frequency energy band band gap properties has important theory significance and engineering
Application value.
Utility model content
The purpose of this utility model is that solve the above-mentioned problems and provides a kind of enough realization wide cut energy in 20KHz
Band band gap, and also there are good energy band band gap properties within 1KHz, vibration and noise reducing need can be met in wide frequency range
The beam-folding phonon crystal with wide cut low bandgap characteristic asked.
The utility model is achieved through the following technical solutions above-mentioned purpose：
A kind of beam-folding phonon crystal with wide cut low bandgap characteristic, including multiple primitive unit cells, multiple primitive unit cells
The phonon crystal is constituted in three-dimensional cube array distribution；
The primitive unit cell includes 12 frames, and 12 frames connect and compose a cube frame structure, and the frame includes two
A folded beam and mass block, the first end of two folded beams are fixedly connected with the lateral surface of the mass block, two institutes
The axis for stating folded beam is overlapped, and passes through the center of the mass block.
Specifically, the binding face of two adjacent primitive unit cells is overlapped setting, eight sides of two binding faces
Frame, which is overlapped, becomes four frames.
Specifically, the folded beam is serpentine configuration, flat where two folded beams on the same frame
Face is overlapped, and the plane where the frame that two of described cube of frame structure are parallel to each other is arranged in parallel.
Preferably, the cross section of the folded beam is round or square structure, the mass block be sphere structure or cube
Body structure.
The beneficial effects of the utility model are：
There is the utility model the beam-folding phonon crystal of wide cut low bandgap characteristic to pass through folded beam quality of connection block,
The coupling stiffness between mass block is reduced, Local Resonance Mechanism is based on, it is mobile to low frequency to be conducive to energy band band gap, and formed more
Wide energy band band gap.
Detailed description of the invention
Fig. 1 is the structural representation of the beam-folding phonon crystal described in the utility model with wide cut low bandgap characteristic
Figure；
Fig. 2 is the structural schematic diagram of primitive unit cell described in the utility model；
Fig. 3 is vibration transfer ratio characteristic curve of the embodiments of the present invention within the scope of wideband 20KHz；
Fig. 4 is that the utility model is vibration transfer ratio characteristic curve of the embodiment within the scope of low frequency 1KHz.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawing：
As depicted in figs. 1 and 2, a kind of 3 formula phonon crystal of folded beam with wide cut low bandgap characteristic of the utility model,
Including multiple primitive unit cells 1, multiple primitive unit cells 1 constitute phonon crystal in three-dimensional cube array distribution；
Primitive unit cell 1 includes 12 frames, and 12 frames connect and compose a cube frame structure, and frame includes two 3 Hes of folded beam
Mass block 2, the first end of two folded beams 3 are fixedly connected with the lateral surface of mass block 2, and the axis of two folded beams 3 is overlapped,
And pass through the center of mass block 2.
The binding face of two adjacent primitive unit cells 1 is overlapped setting, and eight frames of two binding faces, which are overlapped, becomes four frames.
Folded beam 3 is serpentine configuration, and the plane where two folded beams 3 on the same frame is overlapped, cube frame knot
Plane where two frames being parallel to each other of structure is arranged in parallel, and the cross section of folded beam 3 is round or square structure,
Mass block 2 is sphere structure or cube structure.
A specific embodiment is provided below：
The size of cube frame of primitive unit cell 1 is 72.5mm × 72.5mm × 72.5mm, and the cross section of folded beam 3 is pros
Shape, cross sectional dimensions are 3.2mm × 3.2mm, and mass block 2 is spherical shape, and diameter is Φ 10mm.
The present embodiment mass block 2 is identical as the material of folded beam 3, and using the following 8000 type resins, elastic model is about E
=2.48GPa, Poisson's ratio μ=0.41, density p=1.1g/cm3.
Phonon crystal is made of 4 × 4 × 3 primitive unit cells 1 in example, i.e., contains 4 primitive unit cells 1 in length and width direction, high
Contain 3 primitive unit cells 1 in degree direction.
Test of Vibration is carried out, phonon crystal is placed on flexible foam pad during test, is being provided
Stable support simulates free boundary condition while acting on.The top center of phonon crystal is placed with spherical vibration excitor, with
Inputted vibration signal, the excited frequency range of vibration excitor are 40Hz~20KHz.
The top center and bottom center of phonon crystal are bonded with vibrating sensor, the vibration of top center respectively
Dynamic sensor is to detect vibration signal input condition, and the vibrating sensor of bottom center is to detect vibration signal output
Situation.Test is configured with data acquisition processing system to acquire vibrational excitation and response condition in vibration processes, to count
Calculate the vibration transfer ratio for obtaining phonon crystal.
By testing the vibration transfer ratio characteristic curve obtained within the scope of wideband 20KHz and within the scope of low frequency 1KHz,
It is as shown in Figures 3 and 4 respectively.Test result shows 3 formula phonon crystal of folded beam in wideband and low-frequency range very in wide cut degree
Vibration transfer ratio be in very low level, show its energy band band gap properties with wide cut.
The limitation that the technical solution of the utility model is not limited to the above specific embodiments, all skills according to the present utility model
The technology deformation that art scheme is made, each falls within the protection scope of the utility model.
Claims (4)
1. a kind of beam-folding phonon crystal with wide cut low bandgap characteristic, it is characterised in that：It is multiple including multiple primitive unit cells
The primitive unit cell constitutes the phonon crystal in three-dimensional cube array distribution；
The primitive unit cell includes 12 frames, and 12 frames connect and compose a cube frame structure, and the frame includes two foldings
Stoplog and mass block, the first end of two folded beams are fixedly connected with the lateral surface of the mass block, two foldings
The axis of stoplog is overlapped, and passes through the center of the mass block.
2. the beam-folding phonon crystal according to claim 1 with wide cut low bandgap characteristic, it is characterised in that：Phase
The binding face of two adjacent primitive unit cells is overlapped setting, and the frame of eight of two binding faces, which is overlapped, becomes four sides
Frame.
3. the beam-folding phonon crystal according to claim 1 with wide cut low bandgap characteristic, it is characterised in that：Institute
Stating folded beam is serpentine configuration, and the plane where two folded beams on the same frame is overlapped, described cube of frame
Plane where the frame that two of frame structure are parallel to each other is arranged in parallel.
4. the beam-folding phonon crystal according to claim 1 with wide cut low bandgap characteristic, it is characterised in that：Institute
The cross section of folded beam is stated as round or square structure, the mass block is sphere structure or cube structure.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820775479.XU CN208141824U (en) | 2018-05-23 | 2018-05-23 | Beam-folding phonon crystal with wide cut low bandgap characteristic |
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| CN201820775479.XU CN208141824U (en) | 2018-05-23 | 2018-05-23 | Beam-folding phonon crystal with wide cut low bandgap characteristic |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113007254A (en) * | 2021-02-08 | 2021-06-22 | 天津大学 | Elastic wave metamaterial vibration isolation device with particle damping characteristic |
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2018
- 2018-05-23 CN CN201820775479.XU patent/CN208141824U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113007254A (en) * | 2021-02-08 | 2021-06-22 | 天津大学 | Elastic wave metamaterial vibration isolation device with particle damping characteristic |
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