CN110427731A - A kind of honeycomb and its design method of adjustable sound absorbing performance - Google Patents
A kind of honeycomb and its design method of adjustable sound absorbing performance Download PDFInfo
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- CN110427731A CN110427731A CN201910836540.6A CN201910836540A CN110427731A CN 110427731 A CN110427731 A CN 110427731A CN 201910836540 A CN201910836540 A CN 201910836540A CN 110427731 A CN110427731 A CN 110427731A
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- 238000013461 design Methods 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000010521 absorption reaction Methods 0.000 claims abstract description 29
- 238000004080 punching Methods 0.000 claims abstract description 29
- 230000009102 absorption Effects 0.000 claims description 28
- 239000011159 matrix material Substances 0.000 claims description 7
- 238000004364 calculation method Methods 0.000 claims description 6
- 238000012546 transfer Methods 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 4
- 230000009467 reduction Effects 0.000 claims description 3
- 230000035515 penetration Effects 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 230000005611 electricity Effects 0.000 claims 1
- 229920000431 shape-memory polymer Polymers 0.000 abstract description 21
- 239000002131 composite material Substances 0.000 abstract description 7
- 230000008859 change Effects 0.000 abstract description 3
- 238000004088 simulation Methods 0.000 abstract description 2
- 238000010276 construction Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 8
- 239000010410 layer Substances 0.000 description 7
- 230000001413 cellular effect Effects 0.000 description 5
- 230000008901 benefit Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 206010037660 Pyrexia Diseases 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 229920001002 functional polymer Polymers 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
Abstract
The present invention is based on the honeycomb that composite material honeycomb plate structure devises a kind of adjustable sound absorbing performance, design procedure is as follows: being carried out that influence of the punching rate to structure sound absorbing performance is calculated according to the double-deck microperforated panel theoretical model；Devise a kind of shape memory polymer composite material actuating arm that can change adjusting Board position by control external voltage；The punching rate adjustable range than conveniently adjusting is found in numerical simulation and calculating.Design method principle of the present invention is simple, and the characteristics of structure can play adjustable sound absorption peak value only need to be partially added in traditional honeycomb.It is practical, popularization easy to operate.
Description
Technical field
The invention belongs to a kind of Low Noise Design method of honeycomb design, in particular to a kind of adjustable sound absorbing performances
Honeycomb and its design method.
Background technique
Honeycomb sandwich construction is a kind of common engineering structure with sound insulation characteristics and excellent mechanical performances.Traditional honeycomb
Sandwich in order to achieve the purpose that sound absorption it is integrated design generally play sound absorption using the porous material additionally added,
And the construction weight of sound-absorbing porous material is excessive, and additional adverse effect can be brought to aviation, building field.Therefore research honeycomb
Low Noise Design method of sandwich under the premise of keeping light, for the research of honeycomb interlayer composite plate structure vibration and noise reducing
It is of great significance.Existing common hexagonal honeycomb Sandwich Plates (as shown in Figure 1) are by upper surface panel 1 and lower face plate
2 are sandwiched between honeycomb core 9 and combine and constitute.
In recent years, numerous scholars expand further investigation every the integrated performance that absorbs sound to raising honeycomb sandwich construction,
Middle porous plate acoustic adsorption device is applied in honeycomb is a kind of more effective tax while keeping construction weight lighter
Give the mode of honeycomb sound absorbing performance.By microperforated panel absorb sound principle it is found that the piercing aperture of microperforated panel structure, plate thickness,
Punching rate and cavity depth can influence structure sound absorbing performance, i.e. acoustic absorptivity and sound absorption peak frequency.And existing structure is general
It is all to impart the relatively more fixed sound absorbing performance of overall structure one after adding microperforated panel structure in honeycomb, it is right
Extraneous changeable noise circumstance can not play the role of good be directed to.
Shape-memory polymer (SMP) is a kind of novel functional polymer material, with traditional marmem phase
Than have many advantages, such as it is light, can reply that deformation quantity is big, easy to process, cheap, DEFORMATION RESPONSE temperature is easy is adjusted.It is wherein electric
Cause type SMP relative to thermotropic SMP have it is easily controllable, can the advantages such as remote boot server, fast response time, electroluminescent type SMP is answered
Condensation material is fabricated to actuating arm, causes actuating arm by being subject to certain voltage to it deformation occurs, to drive and actuating arm phase
Adjustable punching rate baffle even, and then cause the variation of microperforated panel punching rate, it finally just can reach the mesh of adjustable sound-absorbing frequency
's.
Therefore in the case where not changing hexagonal honeycomb-micropunch composite construction integral layout, directly by changing control
The i.e. changeable microperforated panel punching rate of voltage processed, and then hexagonal honeycomb-micropunch composite plate structure can be made to realize adjustable sound-absorbing
Frequency, to effectively control noise.
Summary of the invention
For the present invention for honeycomb-microperforated panel composite construction by top-down vertical drive situation, design uses one
Actuating arm made of the novel electroluminescent SMP composite material of kind, electroluminescent SMP actuating arm keep external force after first passing through heating in advance and then drop
Temperature " has freezed " part stress and deformation, is then installed in fixed plate, passes through the stress of the electroluminescent fever release " freezing " of material
Achieve the purpose that adjust the hole count that microperforated panel participates in sound absorption to drive the baffle for being mounted on actuating arm other end with deformation, from
And punching rate is made to change, the variation of punching rate plays the role of adjustment structure sound absorbing performance.
The present invention solves its technical problem using following technical scheme.A kind of hexagonal honeycomb knot of adjustable sound absorbing performance
Structure and its design method, honeycomb sandwich panel are combined and are constituted with lower face plate and its honeycomb core being sandwiched between by upper surface panel,
It is characterized in that, be internally provided with in-core microperforated panel in honeycomb core, in-core microperforated panel upper surface one end is fixed with a fixed plate,
The fixed plate central symmetry installation electroluminescent SMP actuating arm fixed there are two one end, electroluminescent SMP actuating arm free end is respectively equipped with one
Adjustable sound-absorbing baffle, actuating arm are connected by lead with external control circuit；Design procedure is as follows:
1) in order to make structure have preferable sound absorbing performance, upper surface panel is constituted using microperforated panel and in-core microperforated panel
The double-deck microperforated panel structure, the setting of microperforated panel theoretical calculation formula are as follows:
zi=ri+iωmi (1)
Wherein, riFor the opposite acoustic resistance of i-th layer of microperforated panel, miFor the opposite acoustic mass of i-th layer of microperforated panel, tiIt is i-th
The plate thickness of layer microperforated panel, diFor the penetration hole diameter of i-th layer of microperforated panel, piIt is that the perforation field of i-th layer of microperforated panel accounts for full plate
The percentage of area, kiFor the perforated plate constant of i-th layer of microperforated panel, μ is the kinematic coefficient of viscosity of air, and ρ is atmospheric density,
C is THE VELOCITY OF SOUND IN AIR under room temperature, f0For sound frequency, ω is sound circular frequency.1 is designated as under wherein upper surface panel is corresponding, core
2 are designated as under interior microperforated panel is corresponding.
The specific acoustic impedance of microperforated panel is calculated by transfer matrix method are as follows:
The transfer matrix of microperforated panel are as follows:
Simultaneously for the transfer matrix of chamber portion are as follows:
Wherein DiFor the cavity thickness after i-th layer of microperforated panel, the double-deck microperforated panel structure is considered, then integrally-built biography
Pass matrix are as follows:
The then whole relative acoustic impedance of the double-deck microperforated panel are as follows:
Obtain structure acoustic absorptivity:
Sound absorption structure resonance obtains acoustic absorptivity when maximum sound absorption peak are as follows:
By above-mentioned theory formula it is found that with punching rate p reduction, opposite acoustic resistance r and opposite acoustic mass m increase, right
Answer the relative sound impedance z of structuretotalIncrease, maximum acoustic absorptivity α0Reduce therewith, i.e. absorption peak frequency is to low frequency wonder；
2) it is based on above-mentioned acoustic absorptivity α0With the changing rule of punching rate p, a kind of honeycomb of adjustable sound absorbing performance is designed
Structure, the deformation generated by the voltage being applied on electroluminescent SMP actuating arm, reaches the mesh for adjusting piercing aperture and punching rate
's；Wherein, punching rate calculation formula when can be by microperforated panel solid matter, that is, rounded projections arranged obtains punching rate:
In formula, B is pitch of holes, and the specific distributing position parameter that can be calculated perforation facilitates the design of baffle；
3) theoretical calculation is carried out according to formula (2), (3), (4), (11), as hole diameter d=0.5mm, plate thickness t=
When 0.5mm, when punching rate is calculated below 5.5%, maximum acoustic absorptivity of the microperforated panel in middle low frequency is just able to maintain
0.5 or more, since the calculating only takes into account maximum acoustic absorptivity, then lower punching rate should be chosen accordingly in actual design
Model so that bandwidth when acoustic absorptivity is 0.5 is wider, when design, is handled according to this principle.
The present invention compares previous cellular board, has the advantage that cellular board can adjust it according to the needs of concrete scene
For the absorption peak of Middle and low frequency noise to reach optimal noise reduction effect；Use voltage that can reduce as control signal more
Mechanical control element, maintain the light characteristic of cellular board；Hybrid precast can be carried out with normal cellular plate in the form of unit,
Engineering manufacture is easier to realize；In the case where a plate is multi-purpose, the light feature that cellular board is possessed also is maintained, is being navigated
Very extensive application prospect is suffered from empty space flight.
Detailed description of the invention
Fig. 1 is common hexagonal honeycomb Sandwich Plates schematic diagram；
Fig. 2 is the honeycomb sandwich construction schematic diagram that upper surface panel of the present invention is equipped with micropunch；
Fig. 3 is the longitudinal sectional view of honeycomb core in the present invention；
Fig. 4 is embodiment top view in the present invention；
Fig. 5 is the planar structure schematic diagram of microperforated panel in core of the present invention；
Fig. 6 a is the structural schematic diagram of fixed plate in the present invention.
Fig. 6 b is the structural schematic diagram of electroluminescent SMP actuating arm in the present invention.
Fig. 6 c is the structural schematic diagram of adjustable sound-absorbing baffle in the present invention.
Fig. 6 d is the assembling original state figure of adjustable sound-absorbing frequency microperforated panel in the present invention.
Fig. 7 be in the present invention adjustable sound-absorbing frequency microperforated panel in on-load voltage U1When state diagram.
Fig. 8 be in the present invention adjustable sound-absorbing frequency microperforated panel in on-load voltage U2When state diagram.
Simulation result of embodiment of the present invention figure when Fig. 9.
In figure: 1. upper surface panels, 2. lower face plates, 3. in-core microperforated panels, 4. fixed plates, 5. electroluminescent SMP actuating arms, 6.
Adjustable sound-absorbing baffle, 7. leads, 8. external control circuits, 9. honeycomb cores.
Specific implementation method
With reference to the accompanying drawing, the present invention will be described in detail.Referring to fig. 2 to Fig. 9.
The present invention is to obtain the preferable sound absorption characteristics of honeycomb sandwich construction, considers upper surface panel being fabricated to microperforated panel, such as
Shown in Fig. 2.
A honeycomb core 9 is taken out in honeycomb sandwich construction as shown in Figure 2, and one piece of Fig. 5 institute is added inside honeycomb core 9
The in-core microperforated panel 3 shown, 3 surface of in-core microperforated panel are close to install the fixed plate 4 just like Fig. 6 a, fixed plate center position on one side
Installation is set there are two the symmetrical electroluminescent SMP actuating arm 5 such as Fig. 6 b, actuating arm free end is respectively symmetrically installed just like Fig. 6 c
Adjustable sound-absorbing baffle 6.Electroluminescent SMP actuating arm 5 is connected with external control circuit 8 using lead 7.
Embodiment: taking out computational domain of 7 honeycomb cores being connected in hexagonal honeycomb plate as embodiment, and embodiment is bowed
View such as Fig. 4, side view are as shown in Figure 3.Wherein 9 size of honeycomb core is as follows: honeycomb core side length 6mm, height 60mm, thickness
0.43mm；Upper surface 1 is the microperforated panel that wear be 0.5mm with aperture, punching rate 3%, plate thickness are 0.5mm, and lower surface 2 is plate
The thin plate of thick 1mm；The present embodiment, which is only arranged in single honeycomb core 9 in center, to be added shown in Fig. 6 d, by in-core microperforated panel
3, the adjustable sound-absorbing frequency microperforated panel that fixed plate 4, electroluminescent SMP actuating arm 5 and adjustable sound-absorbing baffle 6 are constituted, additional lead
7 and external control circuit 8 constitute.
Hexagonal honeycomb sandwich is steadily placed in when emulation and solves domain lowermost end, in hexagonal honeycomb superstructure
Background chamber is set to calculate acoustic absorptivity.
Wherein Fig. 5 is the in-core microperforated panel 3 that position is fixed in hexagonal honeycomb core 9, in Fig. 5 middle punch diameter d=
0.5mm, pitch of holes B=2.5mm, regular hexagon honeycomb core side length R=6mm, the initial perforated rate of in-core microperforated panel 3 are
3.99%, perforation number is 19.
The fixed plate 4 such as Fig. 6 (a) is added on in-core microperforated panel 3, wherein a=1.65mm, b=6.00mm, in fixation
4 surface midpoint of plate is fixed with two sections of electroluminescent SMP actuating arms 5 being arranged symmetrically just like a length of l=1.93mm shown in Fig. 6 (b),
It is symmetrically connected with the adjustable punching rate baffle 6 as shown in Fig. 6 (c) in actuating arm free end, wherein l0=3.99mm, l1=
4.09mm l2=1.30mm, l3=3.96mm, l4=2.58mm, l5=1.26mm.
Fig. 6 d is that fixed plate 4, electroluminescent SMP actuating arm 5, adjustable punching rate baffle 6 are mounted on in-core microperforated panel 3
When original state top view, the hole count for participating in sound absorption at this time is 10, and corresponding punching rate is 2.10%.
In the certain voltage U that electroluminescent SMP actuating arm 5 is connected to external control circuit 8 using lead 7 and exports1Afterwards, electroluminescent
SMP actuating arm 5 generates deformation in 6 plane of adjustable sound-absorbing baffle, drives adjustable sound-absorbing baffle 6 to rotate inward 12 °, at this time structure
For state as shown in fig. 7, the hole count of actual participation sound absorption becomes 16, corresponding punching rate becomes 3.36%；When external control circuit 8
Output voltage is U2When, electroluminescent SMP actuating arm 5 continues to generate deformation, while adjustable sound-absorbing baffle 6 being driven to continue to rotate inward
9 °, for configuration state as shown in figure 8, the hole count of actual participation sound absorption becomes 12, corresponding punching rate becomes 2.52% at this time.
Above-described embodiment is emulated to obtain acoustic absorptivity using numerical simulation software COMSOL as shown in Figure 9.Center
When single honeycomb core addition adjustable sound-absorbing frequency microperforated panel, the acoustic absorptivity of structure has an absorption peak, the suction in 890Hz
The sound absorption that peak mostlys come from upper surface microperforated panel is received, when punching rate reduces, by adjustable sound-absorbing frequency microperforated panel
Bring absorption peak changes to 2270Hz from 2430Hz, is finally moved to 2170Hz to low frequency, meets notional result, and the peak that absorbs sound
Frequency drift is up to 260Hz.Meanwhile with upper surface microperforated panel bring absorption peak and adjustable sound-absorbing frequency micropunch
Plate bring absorption peak it is close, sound absorbing performance of the structure in the frequency range between two absorption peaks is also being obviously improved.
Therefore using the present invention, hexagonal honeycomb-microperforated panel structure can be made to realize adjustable sound-absorbing frequency, to effectively control
Noise processed.
The foregoing is merely preferred embodiments of the present invention, are not intended to limit embodiments of the present invention and protection model
It encloses, to those skilled in the art, should can appreciate that all with made by description of the invention and diagramatic content
Equivalent replacement and obviously change obtained scheme, should all be included within the scope of the present invention.
Claims (6)
1. a kind of honeycomb of adjustable sound absorbing performance, including upper surface panel (1) and lower face plate (2) and it is clipped in upper surface panel
(1) honeycomb core (9) between lower face plate (2), which is characterized in that the honeycomb core (9) is internally provided with in-core micropunch
Plate (3), in-core microperforated panel (3) are equipped with the hole of several sound absorptions, and it is fixed that in-core microperforated panel (3) upper surface one end is fixed with one
Plate (4), fixed plate (4) the central symmetry installation electroluminescent SMP actuating arm (5) fixed there are two one end, electroluminescent SMP actuating arm (5)
Free end one adjustable sound-absorbing baffle (6) is respectively installed, electroluminescent SMP actuating arm (5) is by lead (7) and external control circuit (8)
It is connected, controls the rotation angle of electroluminescent SMP actuating arm (5) by adjusting the voltage U of external control circuit (8) output, thus
The hole count of the sound absorption on in-core microperforated panel (3) is adjusted in control adjustable sound-absorbing baffle (6).
2. the honeycomb of adjustable sound absorbing performance according to claim 1, which is characterized in that the honeycomb core (9) is
Hexagonal honeycomb structure.
3. the honeycomb of adjustable sound absorbing performance according to claim 1, which is characterized in that the in-core microperforated panel
(3) hole of the sound absorption on is at equidistant rounded projections arranged.
4. the honeycomb of adjustable sound absorbing performance according to claim 1, which is characterized in that upper surface panel is set on (1)
There is the hole of several sound absorptions.
5. the honeycomb of adjustable sound absorbing performance according to claim 4, which is characterized in that the upper surface panel (1)
On sound absorption hole at equidistant rounded projections arranged.
6. a kind of design method of the honeycomb of adjustable sound absorbing performance, honeycomb include upper surface panel (1) and lower surface
Plate (2) and the honeycomb core (9) being clipped between upper surface panel (1) and lower face plate (2), which is characterized in that in the honeycomb core (9)
Portion is provided with in-core microperforated panel (3), the hole of upper surface panel (1) and in-core microperforated panel (3) equipped with several sound absorptions, and in-core is micro-
Perforated plate (3) upper surface one end is fixed with a fixed plate (4), fixed plate (4) the central symmetry installation electricity fixed there are two one end
It causes SMP actuating arm (5), the free end of electroluminescent SMP actuating arm (5) is respectively equipped with an adjustable sound-absorbing baffle (6), electroluminescent SMP driving
Arm (5) is connected by lead (7) with external control circuit (8), is controlled by adjusting the voltage U of external control circuit (8) output
The rotation angle of electroluminescent SMP actuating arm (5), to control adjustable sound-absorbing baffle (6) to the sound absorption on in-core microperforated panel (3)
Hole count is adjusted；Design procedure is as follows:
2) in order to make structure have preferable sound absorbing performance, upper surface panel 1 is constituted double using microperforated panel and in-core microperforated panel 3
Layer microperforated panel structure, the setting of microperforated panel theoretical calculation formula are as follows:
zi=ri+iωmi (1)
Wherein, riFor the opposite acoustic resistance of i-th layer of microperforated panel, miFor the opposite acoustic mass of i-th layer of microperforated panel, tiIt is micro- for i-th layer
The plate thickness of perforated plate, diFor the penetration hole diameter of i-th layer of microperforated panel, piIt is that the perforation field of i-th layer of microperforated panel accounts for full plate suqare
Percentage, kiFor the perforated plate constant of i-th layer of microperforated panel, μ is the kinematic coefficient of viscosity of air, and ρ is atmospheric density, and c is
THE VELOCITY OF SOUND IN AIR under room temperature, f0For sound frequency, ω is sound circular frequency.1 is designated as under wherein upper surface panel 1 is corresponding, in-core
2 are designated as under microperforated panel 3 is corresponding.
The specific acoustic impedance of microperforated panel is calculated by transfer matrix method are as follows:
The transfer matrix of microperforated panel are as follows:
Simultaneously for the transfer matrix of chamber portion are as follows:
Wherein DiFor the cavity thickness after i-th layer of microperforated panel, the double-deck microperforated panel structure is considered, then integrally-built transmitting square
Battle array are as follows:
The then whole relative acoustic impedance of the double-deck microperforated panel are as follows:
Obtain structure acoustic absorptivity:
Sound absorption structure resonance obtains acoustic absorptivity when maximum sound absorption peak are as follows:
By above-mentioned theory formula it is found that with punching rate p reduction, opposite acoustic resistance r and opposite acoustic mass m increase, corresponding knot
The relative sound impedance z of structuretotalIncrease, maximum acoustic absorptivity α0Reduce therewith, i.e. absorption peak frequency is to low frequency wonder；
2) it is based on above-mentioned acoustic absorptivity α0With the changing rule of punching rate p, a kind of honeycomb of adjustable sound absorbing performance is designed,
The deformation generated by the voltage being applied on electroluminescent SMP actuating arm achievees the purpose that adjust piercing aperture and punching rate；Its
In, punching rate calculation formula when can be by microperforated panel solid matter, that is, rounded projections arranged obtains punching rate:
In formula, B is pitch of holes, and the specific distributing position parameter that can be calculated perforation facilitates the design of baffle；
3) theoretical calculation is carried out according to formula (2), (3), (4), (11), as hole diameter d=0.5mm, plate thickness t=0.5mm,
When punching rate is calculated below 5.5%, maximum acoustic absorptivity of the microperforated panel in middle low frequency can just be maintained at 0.5 with
On, since the calculating only takes into account maximum acoustic absorptivity, then it should choose the model of lower punching rate accordingly in actual design
So that bandwidth when acoustic absorptivity is 0.5 is wider, when design, is handled according to this principle.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022121563A1 (en) * | 2020-12-08 | 2022-06-16 | 香港大学浙江科学技术研究院 | Adjustable sound insulation device and method for controlling sound insulation |
| WO2024072354A1 (en) * | 2022-09-30 | 2024-04-04 | Tusas- Turk Havacilik Ve Uzay Sanayii Anonim Sirketi | A vibroacoustic structure system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022121563A1 (en) * | 2020-12-08 | 2022-06-16 | 香港大学浙江科学技术研究院 | Adjustable sound insulation device and method for controlling sound insulation |
| WO2024072354A1 (en) * | 2022-09-30 | 2024-04-04 | Tusas- Turk Havacilik Ve Uzay Sanayii Anonim Sirketi | A vibroacoustic structure system |
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