CN104700827A - Broadband perforated-plate sound-absorbing structure - Google Patents
Broadband perforated-plate sound-absorbing structure Download PDFInfo
- Publication number
- CN104700827A CN104700827A CN201310655629.5A CN201310655629A CN104700827A CN 104700827 A CN104700827 A CN 104700827A CN 201310655629 A CN201310655629 A CN 201310655629A CN 104700827 A CN104700827 A CN 104700827A
- Authority
- CN
- China
- Prior art keywords
- chamber
- sub
- plate
- base plate
- perforated
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
The invention discloses a broadband perforated-plate sound-absorbing structure comprising a perforated plate provided with a plurality of pores and a cavity structure having an open end. The perforated plate is disposed at the open end of the cavity structure. The cavity structure comprises a bottom plate facing the open end and side plates fixed to the bottom plate. The bottom plate and the side plates enclose a cavity. The cavity comprises at least two sub-cavities extending from the open end of the cavity to the bottom plate. Bottom space is formed between the bottom of at least one of the sub-cavities and the bottom plate and is communicated with at least one of the other sub-cavities. The broadband perforated-plate sound-absorbing structure has the advantages that sound absorption band can be effectively broadened without increasing the overall depth of the cavity, sound absorption capacity of the perforated plate is improved, the use of nano-scale pores is avoided, and manufacturing cost is lowered.
Description
Technical field
The present invention relates to noise control technique field on the whole, relates in particular to a kind of sound absorption structure based on perforated plate and cavity.
Background technology
Sound absorption structure mainly comprises fiber absorbing material and sound absorbent perforated structure two type.
Fiber absorbing material is as glass fibre, mineral wool etc., although sound sucting band is wider, usually undesirable for low frequency noise process; And, should not use in many occasions owing to easily producing the factor such as bacterium, contaminated environment.
Sound absorbent perforated structure comprises perforated plate and has the cavity of certain depth, wherein perforated plate is installed with the hole that diameter is less than 0.5mm.Sound absorbent perforated structure has clean, high temperature resistant, corrosion-resistant and can bear the advantages such as high velocity air impact, is therefore widely used in the every field of Noise measarement at present.
Traditional sound absorbent perforated structure mainly contains two deficiencies or defect.First, sound absorbent perforated structure only has good sound absorbing capabilities usually near resonant frequency, and during off-resonance frequence, its sound absorbing capabilities is poor.This defect causes the sound sucting band of sound absorbent perforated structure obviously narrower compared with traditional fiber absorbing material; Meanwhile, the resonant frequency due to system depends primarily on the degree of depth of cavity, if need to absorb low-frequency noise, then needs the degree of depth significantly increasing cavity, there is space constraint to a certain degree in actual applications.In actual applications, usually need to adopt double-deck or multilayer sound absorbent perforated structure to widen sound sucting band, but its installation more complicated, and cost is higher.
In order to improve the sound absorbing capabilities of microperforated absorber at low frequency, Chinese invention patent 201210146634.9 discloses a kind of method for making of the sound absorption structure based on perforated plate and chamber systems with internal resonance, and it utilizes in cavity has the resonance characteristics of the mass-spring system of damping to improve the sound absorbing capabilities of sound absorption structure in low-frequency range.But together with the Air Coupling in the parameter (spring rate and quality) of mass-spring system and cavity, this system is difficult to realize in actual applications.
Chinese invention patent 00100641.X discloses a kind of tube bundle type perforated-plate resonance sound-absorbing device, its open end quantity being equal to or less than the tube bank that on perforated plate, the pipe of pore quantity is arranged in is inserted in the cavity on perforated plate, for widening sound sucting band, especially the sound absorbing capabilities of low frequency has certain effect, but this sound absorber complex manufacturing process, cost is higher.
Another shortcoming of traditional sound absorbent perforated structure is: when perforated plate adopts the aperture size such as diameter 0.5mm ~ 1mm being easier to process, its acoustical absorptivity is compared with traditional fiber absorbing material and is nowhere near, in order to obtain better acoustically effective, need the aperture adopting penetration hole diameter 0.1mm ~ 0.2mm even less, which greatly enhances difficulty and the cost of processing.In order to process the decimillimeter level micropore of perforated plate, Chinese invention patent application number 00103311.5 discloses a kind of process equipment of super wide frequency band micropunching acoustical body, comprise chuck, card punch, orifice plate and the guided plate of installing card punch, being used for processing diameter is the micropunch of 0.1mm ~ 0.4mm.Chinese invention patent application numbers 200610023242.8 discloses a kind of microporous sound absorbing structure, and adopt two layers of mesh and middle one deck particle composition absorbent treatment, the slight void between mesh and particle possesses the acoustic characteristic similar with the micropunch of decimillimeter level.Compared with the mechanical processing technique of the conventional punch plate (penetration hole diameter 0.5mm ~ 2mm) generally adopted with current industry, the process of above-mentioned processed filament meter level micropore is complicated, and cost of manufacture is high.
Deficiency or the defect of above-mentioned traditional sound absorbent perforated structure can simply be summed up as: (1) sound sucting band is wide not, and low frequency absorption needs very large cavity depth, is subject to the restriction of installing space in practical application, poor feasibility; (2) good acoustically effective needs the penetration hole diameter of decimillimeter level, adds the cost making perforated plate.
Disclosed in described background technology part, above-mentioned information is only for strengthening the understanding to background of the present invention, and therefore it can comprise the information do not formed prior art known to persons of ordinary skill in the art.
Summary of the invention
It is low and effectively can reduce the wideband sound absorbent perforated structure of cavity depth that the present invention discloses a kind of acoustic frequency bandwidth, cost.
Additional aspect of the present invention and advantage will partly be set forth in the following description, and partly will become obvious from description, or can the acquistion by practice of the present invention.
According to an aspect of the present invention, the invention provides a kind of wideband sound absorbent perforated structure, comprise the perforated plate with multiple perforation and the cavity structure with open end.The described open end of described cavity structure is located at by described perforated plate, and described cavity structure comprises the base plate relative with described open end and is fixed on the coaming plate of described base plate, and described base plate and coaming plate surround a chamber.Wherein, described chamber has at least Liang Ge sub-chamber extended to described base plate direction by the open end of described chamber, bottom at least one sub-chamber in described at least Liang Ge sub-chamber and be formed with bottom space between described base plate, this bottom space is communicated with at least one sub-chamber in other sub-chamber.
According to an embodiment of the present invention, wherein, at least one sub-chamber in described at least Liang Ge sub-chamber extends to described base plate.
According to an embodiment of the present invention, wherein, at least one sub-chamber in described at least Liang Ge sub-chamber does not extend to described base plate, and be arranged in parallel relative to described base plate bottom the sub-chamber not extending to described base plate or be obliquely installed.
According to an embodiment of the present invention, wherein, bottom described sub-chamber be flat shape or curve form.
According to an embodiment of the present invention, wherein, described cavity comprises the first sub-chamber, the second sub-chamber, the 3rd sub-chamber and the 4th sub-chamber, wherein, be formed with the first bottom space bottom described first sub-chamber and between described base plate, this first bottom space is communicated with described second sub-chamber.
According to an embodiment of the present invention, wherein, bottom described 3rd sub-chamber and be formed with the second bottom space between described base plate, this second bottom space is communicated with described second sub-chamber.
According to an embodiment of the present invention, wherein, the mean depth of described first sub-chamber and the mean depth of described 3rd sub-chamber unequal.
According to an embodiment of the present invention, wherein, also comprise some vertical clapboards, described chamber is separated into and corresponds respectively to the first sub-chamber, the second sub-chamber, the Part I of the 3rd sub-chamber and the 4th sub-chamber, Part II, Part III and Part IV by described some vertical clapboards.
According to an embodiment of the present invention, wherein, also comprise the first diapire, the first diapire is arranged at the partial sidewall of described first sub-chamber and described coaming plate; Described first sub-chamber is surrounded by described first diapire, described vertical clapboard and described coaming plate.
According to an embodiment of the present invention, wherein, also comprise the second diapire, the second diapire is arranged in described Part III; Described 3rd sub-chamber is surrounded by described second diapire, described vertical clapboard and described coaming plate.
According to an embodiment of the present invention, wherein, described second sub-chamber extends to described base plate, is surrounded form by described base plate and vertical clapboard and coaming plate.
According to an embodiment of the present invention, wherein, described 4th sub-chamber extends to described base plate, is surrounded form by described base plate and vertical clapboard and coaming plate.
According to an embodiment of the present invention, wherein, described chamber is rectangular-shaped, and the length of described chamber is within the scope of 30mm ~ 200mm, and the width of described chamber is within the scope of 30mm ~ 200mm.
According to an embodiment of the present invention, wherein, the circular port of the perforation of described perforated plate to be diameter be 0.5mm ~ 2mm, perforation also can be hole or the slit of other shape.
According to an embodiment of the present invention, wherein, the percentage of perforation of described perforated plate is 0.5% ~ 3%.
As shown from the above technical solution, advantage of the present invention and good effect are:
In the present invention, cavity comprises at least two sub-chamber extended to base plate direction by the open end of chamber, have bottom space, and this bottom space is communicated with bottom some sub-chamber and between base plate with other sub-chamber.That is, in the layout that partly overlaps between sub-chamber and sub-chamber, that effectively can increase section chambers like this with equivalent depth that is sound absorption frequency dependence, therefore the present invention effectively can widen sound sucting band not increasing in chamber overall depth situation.Conversely, for given sound absorption frequency range, the present invention can significantly reduce required cavity depth.
And based on the cavity structure in the present invention, in the cooperation conventional punch plate perforated plate situation that such as penetration hole diameter is 0.5mm ~ 2mm, sound absorbing capabilities can increase substantially, and its acoustical absorption coefficient can match in excellence or beauty with the perforated plate of decimillimeter level penetration hole diameter.Therefore, the present invention, compared to decimillimeter level perforated plate, considerably reduces manufacturing cost.
Accompanying drawing explanation
Describe its example embodiment in detail by referring to accompanying drawing, above-mentioned and further feature of the present invention and advantage will become more obvious.
Fig. 1 is the stereo decomposing structural representation of wideband sound absorbent perforated structure of the present invention;
Fig. 2 is the stereographic map of wideband sound absorbent perforated structure of the present invention;
Fig. 3 is the stereographic map of the cavity structure in wideband sound absorbent perforated structure of the present invention;
Fig. 4 is the traditional perforated plate acoustic impedance curve map relative to the characteristic impedance of air;
Fig. 5 is the normal incident absorption coefficient curve map of the normal incident absorption coefficient of the sound absorbent perforated structure of the embodiment of the present invention that experiment measuring obtains and traditional sound absorbent perforated structure of identical cavity depth.
Embodiment
More fully example embodiment is described referring now to accompanying drawing.But example embodiment can be implemented in a variety of forms, and should not be understood to be limited to embodiment set forth herein; On the contrary, these embodiments are provided to make the present invention comprehensively with complete, and the design of example embodiment will be conveyed to those skilled in the art all sidedly.Reference numeral identical in figure represents same or similar structure, thus will omit their detailed description.
In the following description, provide many details thus provide fully understanding embodiments of the present invention.But, one of skill in the art will appreciate that and can put into practice technical scheme of the present invention and not have in specific detail one or more, or other method, assembly, material etc. can be adopted.In other cases, known features, material or operation is not shown specifically or describes to avoid fuzzy each aspect of the present invention.
See Fig. 1, Fig. 2 and Fig. 3.Wideband sound absorbent perforated structure of the present invention, comprises perforated plate 1 and cavity structure.
Perforated plate 1 can be a flat board, can be made up of metal, timber or other material.The thickness of perforated plate 1 can within the scope of 0.5mm ~ 2mm, and percentage of perforation can in 0.5% ~ 3% scope.Perforated plate 1 is provided with multiple perforation 10, and multiple perforation 10 can be evenly arranged on perforated plate 1.Perforation 10 can be the circular hole of diameter between 0.1mm ~ 2mm, also can be hole or the seam of other shape that acoustic impedance is close with it.
Cavity structure comprises base plate 3, coaming plate 2 and chamber.Base plate 3 can be a flat board, but not as limit, usual base plate 3 thickness can between 2mm ~ 10mm scope.Base plate 3 is fixed in one end of coaming plate 2, and the other end of coaming plate 2 is open end.Coaming plate 2 can be the framework formed a circle, such as, be circular frame, rectangle frame, oval frame, etc.
Chamber is surrounded by base plate 3 and coaming plate 2, and perforated plate 1 can be fixed to the open end of chamber by any way, covers this open end.
Chamber comprises at least Liang Ge sub-chamber, and at least Liang Ge sub-chamber extends to base plate 3 direction by the open end of chamber, can extend to base plate, also can not extend to base plate 3.Be formed with bottom space bottom at least one sub-chamber at least in Liang Ge sub-chamber and between base plate 3, this bottom space is communicated with at least one sub-chamber in other sub-chamber.Like this, at least two chambers, at least there is Liang Ge sub-chamber and to overlap layout, thus make the equivalent depth of some sub-chamber wherein can be greater than it actually to fathom, then reduce the sound absorption frequency of this sub-chamber.Comprise 4 sub-chamber for chamber to be below described in detail.
See Fig. 3.In wideband sound absorbent perforated structure one embodiment of the present invention, in chamber, be provided with the first vertical clapboard 7, second vertical clapboard 8, first diapire 5 and the second diapire 6.
Coaming plate 2 comprises head and the tail and connects the first side plate 21, second side plate 22, the 3rd side plate 23, the 4th side plate 24 successively, forms a rectangle frame.
First vertical clapboard 7 and the second vertical clapboard 8 are in " ten " word arranged crosswise.The both ends that the both ends of the first vertical clapboard 7 are individually fixed in the second side plate 22 and the 4th side plate 24, second vertical clapboard 8 are individually fixed in the first side plate 21 and the 3rd side plate 23.Thus cavity is separated into 4 parts by the first vertical clapboard 7 and the second vertical clapboard 8, is respectively Part I, Part II, Part III and Part IV in the direction of the clock.
3rd side plate 23, the 4th side plate 24, first vertical clapboard 7, second vertical clapboard 8 and base plate 3 surround Part IV, and namely this Part IV forms the 4th sub-chamber 50.The degree of depth of the 4th sub-chamber 50, the vertical range namely between the open end of chamber and base plate 3 is D4.
First side plate 21, second side plate 22, first vertical clapboard 7, second vertical clapboard 8 and base plate 3 surround Part II, and namely this Part II forms the second sub-chamber 30.The degree of depth of the second sub-chamber 30, the vertical range namely between the open end of chamber and base plate 3 is D2.
First side plate 21, the 4th side plate 24, first vertical clapboard 7, second vertical clapboard 8 and base plate 3 surround Part I.First diapire 5 to be fixed in Part I and to be parallel to base plate 3.First diapire 5 with its before the first side plate 21, the 4th side plate 24, first vertical clapboard 7 and second vertical clapboard 8 of (near perforated plate 1) surround the bottom that the first sub-chamber 20, first diapire 5 is the first sub-chamber 20.First diapire 5 with its after first side plate 21 of (away from perforated plate 1), the 4th side plate 24, first vertical clapboard 7, second vertical clapboard 8 and base plate 3 surround the first bottom space 60.First bottom space 60 and the second sub-chamber 30 are interconnected.The degree of depth of the first sub-chamber 20, the vertical range namely between the open end of chamber and the first diapire 5 is D1.When the first diapire 5 to be in tilted layout relative to base plate 3 or the first diapire 5 for corrugated etc. irregularly shaped time, D1 represents the mean depth of the first bottom space 60.
Second side plate 22, the 3rd side plate 23, first vertical clapboard 7, second vertical clapboard 8 and base plate 3 surround Part III.Second diapire 6 to be fixed in Part III and to be parallel to base plate 3.Second diapire 6 with its before second side plate 22 of (near perforated plate 1), the 3rd side plate 23, first vertical clapboard 7, second vertical clapboard 8 surround the bottom that the 3rd sub-chamber 40, second diapire 6 is the 3rd sub-chamber 40.Second diapire 6 with its after second side plate 22 of (away from perforated plate 1), the 3rd side plate 23, first vertical clapboard 7, second vertical clapboard 8 and base plate 3 surround the second bottom space 70.Second bottom space 70 and the second sub-chamber 30 are interconnected.The degree of depth of the 3rd sub-chamber 40, the vertical range namely between the open end of chamber and the second diapire 6 is D3.When the second diapire 6 to be in tilted layout relative to base plate 3 or the second diapire 6 for corrugated etc. irregularly shaped time, D3 represents the mean depth of the 3rd sub-chamber 40.
Pass between the degree of depth of each sub-chamber is above: D3<D1<D2=D4.Each side plate, base plate 3, each vertical clapboard and each diapire can be assembled together by welding, bonding or other any mounting means, also can be manufactured by casting or alternate manner entirety.The relative position of 4 sub-cavitys can be different from the position shown in Fig. 3.The xsect of each sub-cavity both can be square, also can be rectangle, can also be even that circle waits other shape.The cross-sectional area of 4 sub-cavitys can be the same or different.Length L and the width W of cavity can be the same or different.
The local resonance that the principle of work of sound absorbent perforated structure of the present invention comprises each sub-cavity and perforated plate 1 absorbs sound and strongly intercoupling between them acts on, and details are as follows.
According to the theory of sound absorbent perforated structure known at present, perforated plate 1 forms a resonator system with cavity thereafter, produce resonance when incident sound wave frequency is consistent with the resonant frequency of resonator system, incident acoustic energy is absorbed because of the friction loss of the violent reciprocal air movement generation of perforated plate 1 perforation place.For given perforated plate 1, the resonant frequency of resonator system depends on the degree of depth of cavity, and the degree of depth of cavity is larger, and the frequency of resonator system resonance is lower, and the frequency band producing resonance absorption 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 includes the first bottom space 60 between the first diapire 5 and base plate 2 and the second bottom space 70 between the second diapire 6 and base plate 2, so the cavity depth of its equivalence is far longer than the cavity depth D2 of actual measurement.As shown in Figure 1, if get D3=0.25D4, D1=0.5D4, then the equivalent cavity depth D2 ' of the second sub-cavity 30 approximates the cavity depth D2 of the sub-cavity 50 of twice the 4th, i.e. D2 ' ≈ 2D2.The first order resonance frequency marking each sub-cavity 20,30,40,50 is f1, f2, f3 and f4, then f2<f4<f1<f3.Because the resonance absorption frequency band of 4 sub-cavitys is different, so the sound sucting band when sound sucting band of the sound absorbent perforated structure finally obtained and a cavity independent role is compared, obtain widening very greatly.Because the second sub-cavity 30 effectively make use of the first sub-cavity 20 and the bottom space between the 3rd sub-cavity 40 and base plate 3, the cavity depth of its equivalence increases, so the cavity depth required for resonator system reality obtains effective reduction.
When sound absorbent perforated structure of the present invention produces resonance, because effective cavity depth of sub-cavity 20,30,40,50 is different, so at each resonant frequency, a sub-cavity is only had to produce resonance, therefore also produce resonance sound-absorbing primarily of perforated plate 1 part covering this resonon cavity, this process is called that local resonance absorbs sound.Above-mentioned sub-cavity 20,30,40,50 and perforated plate 1 form 4 different sub-resonance systems.When 4 sub-resonator systems produce resonance respectively, produce the strong effect of intercoupling between them, the sound wave incided before other non-sub-resonance system will attracted to the sub-resonance system producing local resonance sound absorption, is then absorbed.Research display, when the length L of cavity and width W are less than a wave length of sound, the coupling between each sub-resonance system is strong; Along with the length L of cavity and width W strengthen gradually, the coupling between sub-resonance system weakens gradually.In order to make full use of this coupling, reach the effect of strengthening sound absorption, the length L of the cavity in the present invention and width W are between following scope: 30mm≤L≤200mm; 30mm≤W≤200mm.
Existing acoustic theory shows, when Characteristic impedance close to surrounding air of the acoustic impedance of perforated plate 1, sound absorbent perforated structure just can produce good resonance sound-absorbing effect; When the acoustic impedance of perforated plate 1 equals the Characteristic impedance of surrounding air, sound absorbent perforated structure can realize absorbing completely (acoustical absorption coefficient=1) at resonant frequency.The condition of above-mentioned generation good sound absorption is commonly referred to impedance matching condition.In traditional sound absorbent perforated structure when the penetration hole diameter of perforated plate is 0.5mm ~ 2mm, acoustic impedance is generally all less than the Characteristic impedance of air, so acoustically effective is not good.Sound absorbent perforated structure of the present invention, when sub-resonance system produces strong local resonance, the sound wave originally inciding other sub-resonance system also attracted to the sub-resonance system of resonance and is consumed, in other words, when local resonance absorbs, chadless plate is only had to take part in the absorption of acoustic energy.Therefore, the acoustic impedance of the equivalence of perforated plate has been exaggerated.In the present invention, use cavity structure as shown in Figure 3, the equivalent acoustic impedance of perforated plate 1 has been exaggerated about 3 ~ 4 times at resonant frequency.The equivalent acoustic impedance be exaggerated meets impedance matching condition better, and institute to produces better resonance sound-absorbing effect.
Below by an example, effect of the present invention is described in detail.
The present invention adopts cavity structure as shown in Figure 3, and length and the width of its cavity are 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 cumulative volume and its sectional area of the second sub-cavity 30, computation process is as follows: suppose that the sectional area of four sub-cavity open ends is identical, the wall thickness of the first sub-cavity 20 and the 3rd sub-cavity 40 is t=2mm, then the equivalent cavity depth D2 ' of the second sub-cavity 30 can approximate estimation be D2 '=3D2-D1-D3-2t=109mm.Shown in Fig. 2, perforated plate 1 is screwed the front end of cavity structure, forms cavity.The thickness of perforated plate 1 is 0.8mm, and bore a hole as diameter is the circular hole of 0.8mm, percentage of perforation is 1.6%.
As shown in Figure 4, be the perforated plate of 0.8mm for above-mentioned penetration hole diameter as can see from Figure 4, its acoustic impedance much smaller than the acoustic impedance of air, especially low-frequency range (such as the frequency range of 100 hertz to 1000 hertz).Even if therefore at resonant frequency, its acoustical absorptivity is not enough yet.The present invention adopts local resonance principle of absorption, the equivalent acoustic resistance of perforated plate is effectively amplified to the scope (as shown in Figure 4) close with the acoustic impedance of air, thus realizes good sound absorbing capabilities.
Fig. 5 compared for sound absorbent perforated structure of the present invention and the acoustical absorption coefficient of traditional sound absorption structure when sound wave normal incidence.The cavity structure that tradition sound absorbent perforated structure is 50mm by perforated plate (thickness 0.8mm, penetration hole diameter 0.8mm, percentage of perforation 1.6%) and degree of depth of above-mentioned parameter is formed.Therefore, sound absorbent perforated structure of the present invention and the traditional sound absorbent perforated structure for contrasting have identical perforation characteristic and cavity depth.In Fig. 5 shown by solid line is the acoustical absorption coefficient of the sound absorbent perforated structure of the present invention obtained with the measurement of standing wave tube method.The display of " * " asterisk line be the acoustical absorption coefficient of traditional sound absorbent perforated structure.The acoustically effective can observing sound absorbent perforated structure proposed by the invention is obviously better than traditional sound absorbent perforated structure.In the frequency range of 400 hertz to 1600 hertz, the acoustical absorption coefficient of sound absorption structure proposed by the invention remains on the level being greater than 0.8, in a lot of frequency all close to 1.Meanwhile, sound sucting band is significantly widened.
It is pointed out that the sound absorbing capabilities of sound absorbent perforated structure at low frequency is by the effect of depth of cavity, the present embodiment is only different in acoustical absorption coefficient and sound sucting band of contrast the present invention and prior art.Cavity depth in the present embodiment is 50mm, if strengthen cavity depth further, so sound sucting band can be pushed into lower frequency.
Cavity structure in the present invention and penetration hole diameter are that the conventional punch plate of 0.5mm ~ 2mm coordinates and can form wideband sound absorbent perforated structure of the present invention, by utilizing multiple local resonances of cavity structure to absorb, significantly widen the sound sucting band of sound absorbent perforated structure; The bottom space of rational and efficient use between sub-chamber and base plate, reduces about 50% by the cavity depth required for sound absorption structure low frequency absorption.On the other hand, the present invention utilizes the interaction between different local resonance system, improves the actual equivalent acoustic impedance of perforated plate.The circular perforations diameter of the perforated plate 1 in the present invention simultaneously in 0.5mm ~ 2mm, can avoid processed filament meter level perforated plate, and the manufacture difficulty that this significantly reduces becomes, and reduces cost, has obvious economic benefit and social benefit.
Below illustrative embodiments of the present invention is illustrate and described particularly.Should be appreciated that, the invention is not restricted to disclosed embodiment, on the contrary, the invention is intended to contain and be included in various amendment in the spirit and scope of claims and equivalent arrangements.
Claims (15)
1. a wideband sound absorbent perforated structure, comprise the perforated plate (1) with multiple perforation (10) and the cavity structure with open end, the described open end of described cavity structure is located at by described perforated plate, described cavity structure comprises the base plate (3) relative with described open end and is fixed on the coaming plate (2) of described base plate (3), described base plate (3) and coaming plate (2) surround a chamber, it is characterized in that, described chamber has at least Liang Ge sub-chamber extended to described base plate (3) direction by the open end of described chamber, bottom space is formed bottom at least one sub-chamber in described at least Liang Ge sub-chamber and between described base plate (3), this bottom space is communicated with at least one sub-chamber in other sub-chamber.
2. wideband sound absorbent perforated structure as claimed in claim 1, wherein, at least one sub-chamber in described at least Liang Ge sub-chamber extends to described base plate (3).
3. wideband sound absorbent perforated structure as claimed in claim 1, wherein, at least one sub-chamber in described at least Liang Ge sub-chamber does not extend to described base plate (3), and be arranged in parallel relative to described base plate (3) or be obliquely installed bottom the sub-chamber not extending to described base plate (3).
4. wideband sound absorbent perforated structure as claimed in claim 1, wherein, is flat shape bottom described sub-chamber.
5. wideband sound absorbent perforated structure as claimed in claim 1, wherein, described cavity comprises the first sub-chamber (20), the second sub-chamber (30), the 3rd sub-chamber (40) and the 4th sub-chamber (50), wherein, be formed with the first bottom space (60) between described first sub-chamber (20) bottom and described base plate (3), this first bottom space (60) is communicated with described second sub-chamber (30).
6. wideband sound absorbent perforated structure as claimed in claim 5, wherein, be formed with the second bottom space (70) between described 3rd sub-chamber (40) bottom and described base plate (3), this second bottom space (70) is communicated with described second sub-chamber (30).
7. wideband sound absorbent perforated structure as claimed in claim 5, wherein, the mean depth (D1) of described first sub-chamber is unequal with the mean depth (D3) of described 3rd sub-chamber (40).
8. wideband sound absorbent perforated structure as claimed in claim 5, wherein, also comprise some vertical clapboards, described chamber is separated into and corresponds respectively to the first sub-chamber (20), the second sub-chamber (30), the Part I of the 3rd sub-chamber (40) and the 4th sub-chamber (50), Part II, Part III and Part IV by described some vertical clapboards.
9. wideband sound absorbent perforated structure as claimed in claim 8, wherein, also comprises:
First diapire (5), is arranged at the partial sidewall of described first sub-chamber (20) and described coaming plate;
Described first sub-chamber (20) is surrounded by described first diapire (5), described vertical clapboard and described coaming plate (2).
10. wideband sound absorbent perforated structure as claimed in claim 8, wherein, also comprises:
Second diapire (6), is arranged in described Part III;
Described 3rd sub-chamber (40) is surrounded by described second diapire (6), described vertical clapboard and described coaming plate (2).
11. wideband sound absorbent perforated structures as claimed in claim 8, wherein, described second sub-chamber (30) extends to described base plate (3), is surrounded form by described base plate (3) and vertical clapboard and coaming plate (2).
12. wideband sound absorbent perforated structures as claimed in claim 8, wherein, described 4th sub-chamber (50) extends to described base plate (3), is surrounded form by described base plate (3) and vertical clapboard and coaming plate (2).
13. wideband sound absorbent perforated structures according to any one of claim 1 ~ 12, wherein, described chamber is rectangular-shaped, and the length of described chamber (L) is within the scope of 30mm ~ 200mm, and the width (W) of described chamber is within the scope of 30mm ~ 200mm.
14. wideband sound absorbent perforated structures as claimed in claim 1, wherein, the perforation (10) of described perforated plate (1) for diameter be the circular port of 0.5mm ~ 2mm.
15. wideband sound absorbent perforated structures as claimed in claim 1, wherein, the percentage of perforation of described perforated plate (1) is 0.5% ~ 3%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310655629.5A CN104700827B (en) | 2013-12-06 | 2013-12-06 | Wideband sound absorbent perforated structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310655629.5A CN104700827B (en) | 2013-12-06 | 2013-12-06 | Wideband sound absorbent perforated structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104700827A true CN104700827A (en) | 2015-06-10 |
| CN104700827B CN104700827B (en) | 2018-05-22 |
Family
ID=53347886
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310655629.5A Active CN104700827B (en) | 2013-12-06 | 2013-12-06 | Wideband sound absorbent perforated structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104700827B (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN107195292A (en) * | 2016-08-30 | 2017-09-22 | 北京理工大学 | A kind of ultra-thin sound absorption structure of wide low frequency 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 |
| CN108665886A (en) * | 2018-05-23 | 2018-10-16 | 南京邮电大学 | A kind of ultra-thin perforation plate absorbing body of rigidity with resonance sound-absorbing structure |
| 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 |
| CN109707596A (en) * | 2018-11-16 | 2019-05-03 | 青岛海尔股份有限公司 | Silencing means and refrigerator with it |
| CN110626364A (en) * | 2019-09-24 | 2019-12-31 | 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 |
| CN111489732A (en) * | 2020-03-16 | 2020-08-04 | 中国农业大学 | Acoustic super surface, 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 |
| CN113971946A (en) * | 2021-09-30 | 2022-01-25 | 哈尔滨理工大学 | Low-frequency broadband composite micro-perforated plate sound absorption structure |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2466759Y (en) * | 2001-02-22 | 2001-12-19 | 陈鸿烈 | Silencing board |
| CN1820304A (en) * | 2003-12-23 | 2006-08-16 | 卡库斯蒂克斯技术中心股份有限公司 | Component for absorbing air-noise |
| JP2006323204A (en) * | 2005-05-19 | 2006-11-30 | Bridgestone Kbg Co Ltd | Double sound absorption structure |
| CN201826379U (en) * | 2010-10-20 | 2011-05-11 | 董鑫 | Device for eliminating volatile odour and toxic substance in pollution source of toilet stool |
| CN102296715A (en) * | 2011-08-31 | 2011-12-28 | 周国柱 | Sound insulation structure with perforated plate |
| CN102682759A (en) * | 2012-04-28 | 2012-09-19 | 中国科学院合肥物质科学研究院 | Multilayer sound-absorption wedge having resonance sound absorption structure |
-
2013
- 2013-12-06 CN CN201310655629.5A patent/CN104700827B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2466759Y (en) * | 2001-02-22 | 2001-12-19 | 陈鸿烈 | Silencing board |
| CN1820304A (en) * | 2003-12-23 | 2006-08-16 | 卡库斯蒂克斯技术中心股份有限公司 | Component for absorbing air-noise |
| JP2006323204A (en) * | 2005-05-19 | 2006-11-30 | Bridgestone Kbg Co Ltd | Double sound absorption structure |
| CN201826379U (en) * | 2010-10-20 | 2011-05-11 | 董鑫 | Device for eliminating volatile odour and toxic substance in pollution source of toilet stool |
| CN102296715A (en) * | 2011-08-31 | 2011-12-28 | 周国柱 | Sound insulation structure with perforated plate |
| CN102682759A (en) * | 2012-04-28 | 2012-09-19 | 中国科学院合肥物质科学研究院 | Multilayer sound-absorption wedge having resonance sound absorption structure |
Non-Patent Citations (2)
| Title |
|---|
| 《JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA》 * |
| CHUNQI WANGA，LIXI HUANG: ""On the acoustic properties of parallel arrangement of multiple"", 《JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA》 * |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN107195292A (en) * | 2016-08-30 | 2017-09-22 | 北京理工大学 | A kind of ultra-thin sound absorption structure of wide low frequency 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 |
| CN108665886A (en) * | 2018-05-23 | 2018-10-16 | 南京邮电大学 | A kind of ultra-thin perforation plate absorbing body of rigidity with resonance sound-absorbing structure |
| CN109707596A (en) * | 2018-11-16 | 2019-05-03 | 青岛海尔股份有限公司 | Silencing means and refrigerator with it |
| 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 |
| CN110626364A (en) * | 2019-09-24 | 2019-12-31 | 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 |
| CN111489732A (en) * | 2020-03-16 | 2020-08-04 | 中国农业大学 | Acoustic super surface, design method thereof and acoustic device |
| 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 |
| CN113971946A (en) * | 2021-09-30 | 2022-01-25 | 哈尔滨理工大学 | Low-frequency broadband composite micro-perforated plate sound absorption structure |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104700827B (en) | 2018-05-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104700827A (en) | Broadband perforated-plate sound-absorbing structure | |
| CN104732967B (en) | Sound absorption screen for absorbing sound by using coplanar hollow tube | |
| CN103700366B (en) | The broad band sound absorption structure that the mechanical impedance of combinative resonator is combined with microperforated panel | |
| CN204898916U (en) | Multilayer double entry cavity wide band sound absorption device | |
| CN205692567U (en) | A kind of low frequency composite sound absorbing device | |
| CN204303339U (en) | A kind of compound sound-absorption structural | |
| CN203773937U (en) | Sound insulating and absorbing honeycomb panel | |
| CN102298925A (en) | Composite sound-absorbing structure | |
| CN203673822U (en) | Wideband sound absorption structure realized through combining mechanical impedance of composite resonator with micropunch plate | |
| CN205211409U (en) | Microperforated panel combines super materials compound sound absorbing structure of acoustics | |
| CN204229830U (en) | Composite resonant sound absorption structure | |
| CN105788587A (en) | Porous composite sound absorption structure | |
| CN104167203A (en) | Broadband sheet type silencer | |
| CN108399911B (en) | Ventilating, radiating and sound insulating structure of low-frequency broadband | |
| CN110473513B (en) | Micro-slit metamaterial acoustic sandwich plate | |
| CN102646414A (en) | Combined sound absorbing structure based on micropunch and intracavity resonance system | |
| CN202090995U (en) | Slice-type silencer | |
| CN204229829U (en) | Broadband compound sound-absorption structural | |
| CN207503634U (en) | Runner oise damping means | |
| CN204010667U (en) | Broad-band strip-type silencer | |
| CN105810186A (en) | Composite sound absorption structure | |
| KR101339421B1 (en) | Silencer for ship | |
| CN205789089U (en) | A kind of sound absorption unit body and sound-absorbing system | |
| CN110838281A (en) | Multi-cavity sandwich type micro-perforated plate noise elimination structure | |
| CN204303341U (en) | A kind of porous compound sound-absorption structural |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |