CN104700827B - Wideband sound absorbent perforated structure - Google Patents
Wideband sound absorbent perforated structure Download PDFInfo
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- CN104700827B CN104700827B CN201310655629.5A CN201310655629A CN104700827B CN 104700827 B CN104700827 B CN 104700827B CN 201310655629 A CN201310655629 A CN 201310655629A CN 104700827 B CN104700827 B CN 104700827B
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Abstract
The present invention discloses a kind of wideband sound absorbent perforated structure, including the perforated plate with multiple perforation and the cavity structure with open end.Perforated plate is arranged on the open end of cavity structure, and cavity structure includes the bottom plate opposite with open end and is fixed on the coaming plate of bottom plate, and bottom plate and coaming plate surround a chamber.Wherein, chamber has at least two sub-chamber extended from the open end of chamber to bottom plate direction, bottom space is formed between at least one sub-chamber bottom and bottom plate at least two sub-chamber, which connects at least one sub-chamber in other sub-chamber.The present invention can effectively widen sound sucting band in the case that not increasing chamber overall depth；And the acoustical absorptivity of perforated plate is improved, avoids perforating using decimillimeter grade, reduces manufacture cost.
Description
Technical field
This invention relates generally to noise control technique field, relate in particular to a kind of based on perforated plate and cavity
Sound absorption structure.
Background technology
Sound absorption structure mainly includes fiber absorbing material and sound absorbent perforated structure two types.
Fiber absorbing material such as glass fibre, mineral wool etc., although sound sucting band is wider, at low frequency noise
It manages undesirable；Moreover, because it easily generates the factors such as bacterium, pollution environment and should not be used in many occasions.
Sound absorbent perforated structure includes perforated plate and the cavity with certain depth, is wherein installed with diameter on perforated plate and is less than
The hole of 0.5mm.Sound absorbent perforated structure have many advantages, such as cleaning, high temperature resistant, it is corrosion-resistant and can bear high-speed flow impact, because
This is now widely used for the every field of noise abatement.
Mainly there are two deficiency or defects for traditional sound absorbent perforated structure.First, sound absorbent perforated structure is usual only
There is preferable sound absorbing performance near resonant frequency, and its sound absorbing performance is poor during off-resonance frequence.The defect causes to wear
The sound sucting band of soundabsorbing construction is substantially narrower compared with traditional fiber absorbing material；Simultaneously as the resonance frequency of system
Rate depends primarily upon the depth of cavity, if necessary to absorb low-frequency noise, then needs that the depth of cavity is significantly increased, and actually should
There are the limitations of a degree of space in.In practical applications, in order to widen sound sucting band it is usually necessary to use double-deck or
Multilayer sound absorbent perforated structure, but its installation is more complicated, cost is higher.
In order to improve sound absorbing performance of the microperforated absorber in low frequency, 201210146634.9 disclosure of Chinese invention patent
A kind of production method of the sound absorption structure based on perforated plate and intracavitary resonator system, using the quality for having damping in cavity-
The resonance characteristics of spring system improves sound absorbing performance of the sound absorption structure in low-frequency range.However, the parameter due to mass-spring system
Together with Air Coupling in (spring rate and quality) and cavity, which is difficult to realize in practical applications.
Chinese invention patent 00100641.X discloses a kind of tube bundle type perforated-plate resonance sound-absorbing device, and quantity is equal to
Or less than in the cavity on the open end insertion perforated plate of the tube bank that is arranged in of pipe of pore quantity on perforated plate, for opening up
The sound absorbing performance of wide sound sucting band, especially low frequency has certain effect, but the sound absorber complex manufacturing process, cost
It is higher.
It is traditional sound absorbent perforated structure another disadvantage is that：When perforated plate is using the aperture size example for being easier to processing
Its acoustical absorptivity is compared far from enough with traditional fiber absorbing material during such as diameter 0.5mm~1mm, in order to obtain better suction
Sound effective value, it is necessary to using penetration hole diameter 0.1mm~0.2mm even smaller aperture, which greatly enhances processing difficulty and into
This.In order to process the decimillimeter grade micropore of perforated plate, Chinese invention patent application number 00103311.5 discloses a kind of superwide frequency band
The process equipment of micropunch sound absorber, collet, card punch, orifice plate and directing plate including installing card punch, for processing
The micropunch of a diameter of 0.1mm~0.4mm.Chinese invention patent application number 200610023242.8 discloses a kind of micropore sound absorption
Structure, using two layers of mesh and intermediate one layer of particulate matter composition absorbent treatment, the slight void between mesh and particulate matter possesses and silk
The similar acoustic characteristic of the micropunch of meter level.The conventional punch plate (penetration hole diameter 0.5mm~2mm) generally used with current industry
Mechanical processing technique compare, the process of above-mentioned processed filament meter level micropore is complicated, and cost of manufacture is high.
The deficiency or defect of above-mentioned conventional through-hole plate sound absorption structure can simply be attributed to：(1) sound sucting band is not wide enough,
Low frequency absorption needs very big cavity depth, is limited be subject to installation space in practical application, poor feasibility；(2) good suction
Sound effective value needs the penetration hole diameter of decimillimeter grade, adds the cost for making perforated plate.
Above- mentioned information is only used for strengthening the understanding of the background to the present invention, therefore it disclosed in the background section
It can include not forming the information to the prior art known to persons of ordinary skill in the art.
The content of the invention
The present invention discloses a kind of acoustic frequency bandwidth, wideband perforated plate sound absorption at low cost and can effectively reducing cavity depth
Structure.
The additional aspect and advantage of the present invention will be set forth in part in the description, and partly will be from description
Be apparent from or can by the present invention practice and acquistion.
According to an aspect of the present invention, the present invention provides a kind of wideband sound absorbent perforated structure, including being worn with multiple
The perforated plate in hole and the cavity structure with open end.The perforated plate is arranged on the open end of the cavity structure, described
Cavity structure includes the bottom plate opposite with the open end and is fixed on the coaming plate of the bottom plate, and the bottom plate and coaming plate surround
One chamber.Wherein, the chamber has at least two sub-chamber extended from the open end of the chamber to the bottom plate direction,
Bottom space is formed between at least one sub-chamber bottom and the bottom plate at least two sub-chamber, the bottom is empty
Between connected at least one sub-chamber in other sub-chamber.
According to an embodiment of the present invention, wherein, at least one sub-chamber at least two sub-chamber extends
To the bottom plate.
According to an embodiment of the present invention, wherein, at least one sub-chamber at least two sub-chamber does not prolong
The bottom plate is extended, and the sub-chamber bottom for not extending to the bottom plate is arranged in parallel or is obliquely installed compared with the bottom plate.
According to an embodiment of the present invention, wherein, the sub-chamber bottom is flat shape or curve form.
According to an embodiment of the present invention, wherein, the cavity includes the first sub-chamber, the second sub-chamber, the 3rd son
Chamber and the 4th sub-chamber, wherein, the first bottom space is formed between first sub-chamber bottom and the bottom plate, this
One bottom space is connected with second sub-chamber.
According to an embodiment of the present invention, wherein, is formed between the 3rd sub-chamber bottom and the bottom plate
Two bottom spaces, second bottom space are connected with second sub-chamber.
According to an embodiment of the present invention, wherein, the mean depth of first sub-chamber and the 3rd sub-chamber
Mean depth it is unequal.
According to an embodiment of the present invention, several vertical clapboards are further included wherein, several vertical clapboards are by the chamber
Be separated into the first portion for corresponding respectively to the first sub-chamber, the second sub-chamber, the 3rd sub-chamber and the 4th sub-chamber, second
Point, Part III and Part IV.
According to an embodiment of the present invention, wherein, the first bottom wall is further included, the first bottom wall is arranged at the described first sub- chamber
The partial sidewall of room and the coaming plate；First sub-chamber is surrounded by first bottom wall, the vertical clapboard and the coaming plate.
According to an embodiment of the present invention, wherein, the second bottom wall is further included, the second bottom wall is arranged at the Part III
It is interior；3rd sub-chamber is surrounded by second bottom wall, the vertical clapboard and the coaming plate.
According to an embodiment of the present invention, wherein, second sub-chamber extends to the bottom plate, by the bottom plate and
Vertical clapboard and coaming plate, which surround, to be formed.
According to an embodiment of the present invention, wherein, the 4th sub-chamber extends to the bottom plate, by the bottom plate and
Vertical clapboard and coaming plate, which surround, to be formed.
According to an embodiment of the present invention, wherein, the chamber is in rectangular-shape, and the length of the chamber is in 30mm
In the range of~200mm, the width of the chamber is in the range of 30mm~200mm.
According to an embodiment of the present invention, wherein, the perforation of the perforated plate is the circle of a diameter of 0.5mm~2mm
Hole, perforation or other shapes of hole or slit.
According to an embodiment of the present invention, wherein, the punching rate of the perforated plate is 0.5%~3%.
As shown from the above technical solution, the advantages and positive effects of the present invention are：
In the present invention, cavity includes at least two sub-chamber extended from the open end of chamber to bottom plate direction, and one is a little
There is bottom space, and the bottom space is connected with other sub-chamber between cavity bottom and bottom plate.That is, sub-chamber
It is in the arrangement that partly overlaps between sub-chamber, can be so effectively increased the equivalent depth with the frequency dependence that absorbs sound of section chambers,
Therefore the present invention can effectively widen sound sucting band in the case that not increasing chamber overall depth.Conversely, for given sound absorption
Required cavity depth can be greatly lowered in bandwidth, the present invention.
It is 0.5mm~2mm in cooperation conventional punch plate such as penetration hole diameter moreover, based on the cavity structure in the present invention
Perforated plate in the case of, sound absorbing performance can increase substantially, and acoustic absorptivity can be with the perforated plate of decimillimeter grade penetration hole diameter
It matches in excellence or beauty.Therefore, the present invention considerably reduces manufacture cost compared to decimillimeter grade perforated plate.
Description of the drawings
Its example embodiment is described in detail by referring to accompanying drawing, above and other feature of the invention and advantage will become
It is more obvious.
Fig. 1 is the dimensional decomposition structure diagram of wideband sound absorbent perforated structure of the present invention；
Fig. 2 is the stereogram of wideband sound absorbent perforated structure of the present invention；
Fig. 3 is the stereogram of the cavity structure in wideband sound absorbent perforated structure of the present invention；
Fig. 4 is acoustic impedance graph of traditional perforated plate compared with the characteristic impedance of air；
Fig. 5 is the normal incident absorption coefficient and phase of the sound absorbent perforated structure for the embodiment of the present invention that experiment measurement obtains
With the normal incident absorption coefficient graph of the conventional through-hole plate sound absorption structure of cavity depth.
Specific embodiment
Example embodiment is described more fully with reference to the drawings.However, example embodiment can be with a variety of shapes
Formula is implemented, and is not understood as limited to embodiment set forth herein；On the contrary, these embodiments are provided so that the present invention will
Fully and completely, and by the design of example embodiment comprehensively it is communicated to those skilled in the art.Identical attached drawing in figure
Mark represents same or similar structure, thus will omit their detailed description.
In the following description, many details are provided to fully understand embodiments of the present invention so as to provide.
It will be appreciated, however, by one skilled in the art that can put into practice technical scheme without one in specific detail or
More or it may be employed other methods, component, material etc..In other cases, it is not shown in detail or describes known knot
Structure, material or operation are to avoid fuzzy each aspect of the present invention.
Referring to Fig. 1, Fig. 2 and Fig. 3.Wideband sound absorbent perforated structure of the present invention, including perforated plate 1 and cavity structure.
Perforated plate 1 can be a tablet, can be made of metal, timber or other materials.The thickness of perforated plate 1 can be
In the range of 0.5mm~2mm, punching rate can be in the range of 0.5%~3%.Perforated plate 1 is equipped with multiple perforation 10, multiple perforation 10
It can be evenly arranged on perforated plate 1.Perforation 10 can be diameter between 0.1mm~2mm circular hole, or acoustic impedance and
Its similar other shapes of hole or seam.
Cavity structure includes bottom plate 3, coaming plate 2 and chamber.Bottom plate 3 can be a tablet, and but not limited to this, usual bottom plate
3 thickness can be between 2mm~10mm scopes.Bottom plate 3 is fixed in one end of coaming plate 2, and the other end of coaming plate 2 is open end.It encloses
Plate 2 can be the frame to form a circle, be, for example, circular frame, rectangle frame, oval frame, etc..
Chamber is surrounded by bottom plate 3 and coaming plate 2, and perforated plate 1 can be fixed to the open end of chamber, covering in any way
The open end.
Chamber includes at least two sub-chamber, and the open end of at least two sub-chamber from chamber is prolonged to 3 direction of bottom plate
It stretches, bottom plate can be extended to, bottom plate 3 can not also be extended to.At least one sub-chamber bottom at least two sub-chamber with
Bottom space is formed between bottom plate 3, which connects at least one sub-chamber in other sub-chamber.In this way, extremely
In few two chambers, at least overlap arrangement there are Liang Ge sub-chamber, so that the equivalent depth of some sub-chamber therein
Degree can be more than its actual sound absorption frequency for fathoming, then reducing the sub-chamber.Below using chamber include 4 sub-chamber as
Example is described in detail.
Referring to Fig. 3.In one embodiment of wideband sound absorbent perforated structure of the present invention, be provided in chamber the first vertical clapboard 7,
Second vertical clapboard 8, the first bottom wall 5 and the second bottom wall 6.
Coaming plate 2 includes head and the tail and is sequentially connected the first side plate 21, the second side plate 22, the 3rd side plate 23, the 4th side plate 24, is formed
One rectangle frame.
First vertical clapboard 7 and the second vertical clapboard 8 are in " ten " word arranged crosswise.The both ends of first vertical clapboard 7 are fixed respectively
In the second side plate 22 and the 4th side plate 24, the both ends of the second vertical clapboard 8 are individually fixed in the first side plate 21 and the 3rd side plate 23.
So as to which cavity is separated into 4 parts by the first vertical clapboard 7 and the second vertical clapboard 8, respectively first portion, the in the direction of the clock
Two parts, Part III and Part IV.
3rd side plate 23, the 4th side plate 24, the first vertical clapboard 7, the second vertical clapboard 8 and bottom plate 3 surround Part IV, should
Part IV forms the 4th sub-chamber 50.Hanging down between the open end of the depth of the 4th sub-chamber 50, i.e. chamber and bottom plate 3
Straight distance is D4.
First side plate 21, the second side plate 22, the first vertical clapboard 7, the second vertical clapboard 8 and bottom plate 3 surround second portion, should
Second portion forms the second sub-chamber 30.Hanging down between the depth of the second sub-chamber 30, the i.e. open end of chamber and bottom plate 3
Straight distance is D2.
First side plate 21, the 4th side plate 24, the first vertical clapboard 7, the second vertical clapboard 8 and bottom plate 3 surround first portion.The
One bottom wall 5 is fixed in first portion and parallel to bottom plate 3.First bottom wall 5 and first side plate of the front (close to perforated plate 1)
21st, the 4th side plate 24, the first vertical clapboard 7 and the second vertical clapboard 8 surround the first sub-chamber 20, and the first bottom wall 5 is the first sub- chamber
The bottom of room 20.First bottom wall 5 with behind (away from perforated plate 1) the first side plate 21, the 4th side plate 24, the first vertical clapboard 7,
Second vertical clapboard 8 and bottom plate 3 surround the first bottom space 60.First bottom space 60 and the second sub-chamber 30 are interconnected.
Vertical range between the depth of first sub-chamber 20, the i.e. open end of chamber and the first bottom wall 5 is D1.When the first bottom wall 5
It is in tilted layout compared with bottom plate 3 or the first bottom wall 5 is corrugated when irregular shapes, D1 represents the first bottom space 60
Mean depth.
Second side plate 22, the 3rd side plate 23, the first vertical clapboard 7, the second vertical clapboard 8 and bottom plate 3 surround Part III.The
Two bottom walls 6 are fixed in Part III and parallel to bottom plate 3.Second bottom wall 6 and second side plate of the front (close to perforated plate 1)
22nd, the 3rd side plate 23, the first vertical clapboard 7, the second vertical clapboard 8 surround the 3rd sub-chamber 40, and the second bottom wall 6 is the 3rd sub-chamber
40 bottom.Second bottom wall 6 with behind (away from perforated plate 1) the second side plate 22, the 3rd side plate 23, the first vertical clapboard 7, the
Two vertical clapboards 8 and bottom plate 3 surround the second bottom space 70.Second bottom space 70 and the second sub-chamber 30 are interconnected.The
Vertical range between the depth of three sub-chamber 40, the i.e. open end of chamber and the second bottom wall 6 is D3.When 6 phase of the second bottom wall
It is in tilted layout for bottom plate 3 or the second bottom wall 6 is corrugated when irregular shapes, D3 represents being averaged for the 3rd sub-chamber 40
Depth.
The relation between the depth of each sub-chamber is above：D3<D1<D2=D4.Each side plate, bottom plate 3, each vertical clapboard with
And each bottom wall can also pass through casting or other by welding, being bonded or other any mounting means are assembled together
Mode integrally manufactures.The relative position of 4 sub- cavitys can be different from position shown in Fig. 3.Both may be used the cross section of each sub- cavity
Think square, or rectangle or even can also be the other shapes such as circle.The cross-sectional area of 4 sub- cavitys can be with
It is identical can not also be same.The length L and width W of cavity can be the same or different.
The operation principle of sound absorbent perforated structure of the present invention include each sub- cavity and perforated plate 1 local resonance sound absorption and
The strong effect of intercoupling between them, details are as follows.
According to the theory for the sound absorbent perforated structure being currently known, perforated plate 1 forms a resonance with cavity thereafter and is
System, resonance is generated when the frequency of incident acoustic wave and the consistent resonant frequency of resonator system, and incident acoustic energy is perforated because of perforated plate 1
Friction loss that the violent reciprocal air movement at place generates and absorbed.For given perforated plate 1, the resonance of resonator system
Frequency depends on the depth of cavity, and the depth of cavity is bigger, and the frequency of resonator system resonance is lower, generates the frequency of RESONANCE ABSORPTION
Band is also lower.
The cavity depth of each sub- cavity 20,30,40,50 in the present invention is respectively D1, D2, D3 and D4, and D3<D1<D2=
D4.Because the second sub- cavity 30 include the first bottom space 60 between the first bottom wall 5 and bottom plate 2 and the second bottom wall 6 with
The second bottom space 70 between bottom plate 2, so its equivalent cavity depth is far longer than the cavity depth D2 actually measured.Such as
Shown in Fig. 1, if taking D3=0.25D4, D1=0.5D4, then the equivalent cavity depth D2 ' of the second sub- cavity 30 be approximately equal to twice the 4th
The cavity depth D2 of sub- cavity 50, i.e. D2 ' ≈ 2D2.Mark the first order resonance frequency of each sub- cavity 20,30,40,50 for f1, f2,
F3 and f4, then f2<f4<f1<f3.Because the RESONANCE ABSORPTION frequency band of 4 sub- cavitys is different, the perforated plate finally obtained
The sound sucting band when sound sucting band of sound absorption structure and a cavity independent role is compared, and obtains widening greatly very much.Because the second son
Cavity 30 is effectively utilized the bottom space between the first sub- 20 and the 3rd sub- cavity 40 of cavity and bottom plate 3, equivalent cavity
Depth increases, so the practically necessary cavity depth of resonator system has obtained effective reduction.
When the sound absorbent perforated structure of the present invention generates resonance, because effective cavity depth of sub- cavity 20,30,40,50
Different, so in each resonant frequency, an only sub- cavity generates resonance, therefore also mainly by covering resonon sky
1 part of perforated plate of chamber generates resonance sound-absorbing, this process is known as local resonance sound absorption.Above-mentioned sub- cavity 20,30,40,50 with
Perforated plate 1 forms 4 different sub-resonance systems.When 4 sub- resonator systems generate resonance respectively, generation is strong between them
The effect of intercoupling, incide into the sound wave before other non-sub-resonance systems will be attracted to generate local resonance sound absorption
Then sub-resonance system is absorbed.For studies have shown that when the length L and width W of cavity are less than a wave length of sound, each son is altogether
Coupling between vibrating system is strong；It is gradually increased with the length L and width W of cavity, the coupling between sub-resonance system
Effect gradually weakens.In order to make full use of this coupling, achieve the effect that strengthen absorbing sound, the length of the cavity in the present invention
L and width W are between following scope：30mm≤L≤200mm;30mm≤W≤200mm.
Existing acoustic theory show acoustic impedance when perforated plate 1 close to surrounding air Characteristic impedance when, perforated plate
Sound absorption structure can just generate good resonance sound-absorbing effect；When the acoustic impedance of perforated plate 1 is equal to the characteristic acoustic resistance of surrounding air
When anti-, sound absorbent perforated structure can be realized in resonant frequency and fully absorbed (acoustic absorptivity=1).Above-mentioned generation good sound absorption
Condition is commonly referred to as impedance matching condition.When the penetration hole diameter of perforated plate is 0.5mm~2mm in traditional sound absorbent perforated structure
When, acoustic impedance is generally less than the Characteristic impedance of air, so sound absorption effect is bad.The sound absorbent perforated structure of the present invention,
When sub-resonance system generates strong local resonance, the sound wave for inciding into other sub-resonance systems originally is also attracted to resonance
Sub-resonance system and be consumed, in other words, when local resonance absorbs, only chadless plate takes part in the suction of acoustic energy
It receives.Therefore, the equivalent acoustic impedance of perforated plate is exaggerated.In the present invention, cavity structure as shown in Figure 3, perforated plate 1 are used
Equivalent acoustic impedance be exaggerated about 3~4 times in resonant frequency.The equivalent acoustic impedance being amplified preferably meets impedance matching
Condition, so generating better resonance sound-absorbing effect.
Effect of the present invention is described in detail below by an example.
The present invention uses cavity structure as shown in Figure 3, the length and width of hollow cavity be respectively L=100mm, W=
100mm.First, second, third and fourth sub- cavity 20,30,40,50, cavity depth be respectively D1=25mm, D2=50mm, D3=12mm,
D4=50mm.According to the total volume of the second sub- cavity 30 and its sectional area, calculating process is as follows：Assuming that four sub- cavity open ends
Sectional area it is identical, the wall thickness of the first sub- 20 and the 3rd sub- cavity 40 of cavity is t=2mm, then the equivalent sky of the second sub- cavity 30
Chamber depth D2 ' can be using approximate estimation as D2 '=3D2-D1-D3-2t=109mm.As shown in Figure 2, perforated plate 1 is attached by screws to
The front end of cavity structure forms cavity.The thickness of perforated plate 1 is 0.8mm, is perforated as the circular hole of a diameter of 0.8mm, and punching rate is
1.6%。
As shown in figure 4, it is as can see from Figure 4 the perforated plate of 0.8mm for above-mentioned penetration hole diameter, acoustic impedance is remote
Less than the acoustic impedance of air, especially low-frequency range (such as 100 hertz to 1000 hertz of frequency range).Even if therefore
In resonant frequency, acoustical absorptivity is also insufficient to.The present invention is had the equivalent acoustic resistance of perforated plate using local resonance principle of absorption
Effect is amplified to the scope close with the acoustic impedance of air (as shown in Figure 4), so as to fulfill good sound absorbing performance.
Fig. 5 compared sound absorption system of the sound absorbent perforated structure of the present invention with traditional sound absorption structure in sound wave normal incidence
Number.Conventional through-hole plate sound absorption structure by above-mentioned parameter perforated plate (thickness 0.8mm, penetration hole diameter 0.8mm, punching rate 1.6%) and
One depth is made of the cavity structure of 50mm.Therefore, sound absorbent perforated structure of the invention and worn for the tradition of comparison
Soundabsorbing construction has identical perforation characteristic and cavity depth.In Fig. 5 shown by solid line be with standing wave tube method measure
The acoustic absorptivity of the sound absorbent perforated structure of the obtained present invention.Conventional through-hole plate sound absorption structure is shown in " * " asterisk line
Acoustic absorptivity.It is observed that the sound absorption effect of sound absorbent perforated structure proposed by the invention is substantially better than traditional perforated plate
Sound absorption structure.In 400 hertz to 1600 hertz of frequency range, the acoustic absorptivity of sound absorption structure proposed by the invention is kept
In the level more than 0.8, in many frequencies all close to 1.Meanwhile sound sucting band is significantly widened.
It is pointed out that sound absorbent perforated structure low frequency sound absorbing performance by the effect of depth of cavity, the present embodiment
Only the comparison present invention and difference of the prior art in terms of acoustic absorptivity and sound sucting band.Cavity depth in the present embodiment is
50mm, if further increasing cavity depth, then sound sucting band can be pushed into lower frequency.
Cavity structure in the present invention may make up this hair with penetration hole diameter for the conventional punch plate cooperation of 0.5mm~2mm
Bright wideband sound absorbent perforated structure absorbs by using multiple local resonances of cavity structure, has significantly widened perforated plate sound absorption
The sound sucting band of structure；Bottom space of the rational and efficient use between sub-chamber and bottom plate, by sound absorption structure low frequency absorption institute
The cavity depth needed reduces about 50%.On the other hand, the present invention utilizes the interaction between different local resonance systems,
Improve the actual equivalent acoustic impedance of perforated plate.Simultaneously the present invention in perforated plate 1 circular perforations diameter can 0.5mm~
In 2mm, processed filament meter level perforated plate is avoided, this manufacture difficulty being greatly lowered is into reducing cost, have apparent economical
Benefit and social benefit.
Exemplary embodiments of the present invention are particularly shown and described above.It should be understood that the invention is not restricted to institute
Disclosed embodiment, on the contrary, it is intended to cover comprising various modifications in the spirit and scope of the appended claims
And equivalent arrangements.
Claims (15)
1. a kind of wideband sound absorbent perforated structure, including the perforated plate (1) with multiple perforation (10) and the sky with open end
Cavity configuration, the perforated plate are arranged on the open end of the cavity structure, and the cavity structure includes and the open end phase
To bottom plate (3) and be fixed on the coaming plates (2) of the bottom plate (3), the bottom plate (3) and coaming plate (2) surround a chamber, special
Sign is that the chamber has at least two sub-chamber extended from the open end of the chamber to the bottom plate (3) direction, institute
It states and is formed with bottom space between at least one sub-chamber bottom at least two sub-chamber and the bottom plate (3), the bottom
Space is connected at least one sub-chamber in other sub-chamber.
2. wideband sound absorbent perforated structure as described in claim 1, wherein, it is at least one at least two sub-chamber
Sub-chamber extends to the bottom plate (3).
3. wideband sound absorbent perforated structure as described in claim 1, wherein, it is at least one at least two sub-chamber
Sub-chamber does not extend to the bottom plate (3), and does not extend to the sub-chamber bottom of the bottom plate (3) compared with the bottom plate (3)
It is arranged in parallel or is obliquely installed.
4. wideband sound absorbent perforated structure as described in claim 1, wherein, the sub-chamber bottom is flat shape.
5. wideband sound absorbent perforated structure as described in claim 1, wherein, the cavity includes the first sub-chamber (20), the
Two sub-chamber (30), the 3rd sub-chamber (40) and the 4th sub-chamber (50), wherein, the first sub-chamber (20) bottom with it is described
The first bottom space (60) is formed between bottom plate (3), which connects with second sub-chamber (30).
6. wideband sound absorbent perforated structure as claimed in claim 5, wherein, the 3rd sub-chamber (40) bottom and the bottom
The second bottom space (70) is formed between plate (3), which connects with second sub-chamber (30).
7. wideband sound absorbent perforated structure as claimed in claim 5, wherein, the mean depth (D1) of first sub-chamber with
The mean depth (D3) of 3rd sub-chamber (40) is unequal.
8. wideband sound absorbent perforated structure as claimed in claim 5, wherein, further include several vertical clapboards, it is described it is several it is perpendicular every
Plate, which divides the chamber into, corresponds respectively to the first sub-chamber (20), the second sub-chamber (30), the 3rd sub-chamber (40) and
First portion, second portion, Part III and the Part IV of four sub-chamber (50).
9. wideband sound absorbent perforated structure as claimed in claim 8, wherein, it further includes：
First bottom wall (5) is arranged at the partial sidewall of first sub-chamber (20) and the coaming plate；
First sub-chamber (20) is surrounded by first bottom wall (5), the vertical clapboard and the coaming plate (2).
10. wideband sound absorbent perforated structure as claimed in claim 8, wherein, it further includes：
Second bottom wall (6), is arranged in the Part III；
3rd sub-chamber (40) is surrounded by second bottom wall (6), the vertical clapboard and the coaming plate (2).
11. wideband sound absorbent perforated structure as claimed in claim 8, wherein, second sub-chamber (30) extends to described
Bottom plate (3) is made of the bottom plate (3) and vertical clapboard and coaming plate (2) encirclement.
12. wideband sound absorbent perforated structure as claimed in claim 8, wherein, the 4th sub-chamber (50) extends to described
Bottom plate (3) is made of the bottom plate (3) and vertical clapboard and coaming plate (2) encirclement.
13. the wideband sound absorbent perforated structure as any one of claim 1~12, wherein, the chamber is in cuboid
Shape, and the length (L) of the chamber, in the range of 30mm~200mm, the width (W) of the chamber is in 30mm~200mm scopes
It is interior.
14. wideband sound absorbent perforated structure as described in claim 1, wherein, the perforation (10) of the perforated plate (1) is diameter
For the round hole of 0.5mm~2mm.
15. wideband sound absorbent perforated structure as described in claim 1, wherein, the punching rate of the perforated plate (1) for 0.5%~
3%。
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310655629.5A CN104700827B (en) | 2013-12-06 | 2013-12-06 | Wideband sound absorbent perforated structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310655629.5A CN104700827B (en) | 2013-12-06 | 2013-12-06 | Wideband sound absorbent perforated structure |
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| CN104700827A CN104700827A (en) | 2015-06-10 |
| CN104700827B true CN104700827B (en) | 2018-05-22 |
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| CN201310655629.5A Active CN104700827B (en) | 2013-12-06 | 2013-12-06 | Wideband sound absorbent perforated structure |
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| CN106801988A (en) * | 2015-11-26 | 2017-06-06 | 博世热力技术（山东）有限公司 | For the denoising device and air processor of air processor |
| CN107195292B (en) * | 2016-08-30 | 2020-07-28 | 北京理工大学 | Ultra-thin sound absorption structure of wide low frequency sound absorption |
| CN107504474A (en) * | 2017-03-08 | 2017-12-22 | 华电重工股份有限公司 | A kind of strip-type silencer |
| CN108665886B (en) * | 2018-05-23 | 2024-05-14 | 南京邮电大学 | Rigid ultrathin perforated plate absorber with resonance sound absorption structure |
| CN109707596B (en) * | 2018-11-16 | 2021-02-26 | 海尔智家股份有限公司 | Silencing device and refrigerator with same |
| CN109346051A (en) * | 2018-12-13 | 2019-02-15 | 西安交通大学 | Built-in perforated-plate Helmholtz resonator and broad band low frequency sound absorption structure based on it |
| CN110626364B (en) * | 2019-09-24 | 2021-10-22 | 中车株洲电力机车有限公司 | Sound insulation structure of cooling system of railway vehicle and manufacturing method of sound insulation structure |
| CN111489732B (en) * | 2020-03-16 | 2024-01-19 | 中国农业大学 | Acoustic super-surface and design method thereof and acoustic device |
| CN113123261A (en) * | 2021-05-12 | 2021-07-16 | 中南大学 | Bionic sound absorption structure based on conch cavity structure and sound absorption unit plate thereof |
| CN113971946B (en) * | 2021-09-30 | 2022-08-19 | 哈尔滨理工大学 | Low-frequency broadband composite micro-perforated plate sound absorption structure |
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