CN101962980A - Multiple helmholtz resonator parallel cellular sandwich wood sound absorption plate - Google Patents
Multiple helmholtz resonator parallel cellular sandwich wood sound absorption plate Download PDFInfo
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Abstract
The invention relates to a multiple helmholtz resonator parallel cellular sandwich wood sound absorption plate, belonging to the field of sound absorption technologies. The invention solves the problems of small chamber volume ratio, narrow sound absorption frequency band and poor sound absorption effect in the traditional sound absorption panels. Technical essential is characterized in that a sandwich layer is a cellular sandwich layer; the cellular sandwich layer is formed from splicing a plurality of cylinder bodies with hexagonal cross sections; an inner cavity of each hexagonal cylinder body is a cell cavity chamber; the chamber volume ratio of the sandwich layer is larger than 90%; the area of perforation shape surrounded by contour lines of each perforation is less than a half of the hexagonal area of corresponding sandwich layer; and each small through hole on a panel is communicated with the cell cavity chamber at the corresponding position of the sandwich layer. The invention has wider sound absorption frequency band and better medium high frequency sound absorption performance, and the sanding wave tube method sound absorption coefficients respectively reach 0.8, 0.9 and 0.7 at 500Hz, 1000Hz and 2000Hz. In addition, the invention also has the characteristics of light weight, high ratio of strength to weight, good decorative effect, and the like; and wood resources can be saved, preparation process is simple, and cost is low.
Description
Technical field
The present invention relates to a kind of acoustical board, belong to the sound absorption technique field.
Background technology
Along with big industrial continuous development, noise pollution has become with air pollution, water pollutes one of three big pollutions arranged side by side, is listed in the subject matter of 21 century environment pollution control.Normal order of work of influence of noise and operating efficiency also influence daily life and physical and mental health.The control noise has become the human task of top priority.
Sound absorption is one of major measure of noise control.At present, the ornament materials that is used for indoor sound absorption generally adopts inorfil porous absorption materials such as mineral wool, glass wool, and they are crisp because of fibroid in the process of installation, fractureing easily forms that dust dissipation contaminated environment, influence are breathed, scratchy skin.Also have the metal piercing acoustical board in addition,, but easily give ice-cold sensation, be not suitable for being used for the room in little space, and cost compares higher as punched steel plate, Pierced Aluminum Plank etc.
Wooden acoustical board is a kind of emerging sound absorption material, mainly contains groove wood, hole wood acoustical board and wood wool acoustical board on the current market.Wherein, it is in the majority to open the groove wood acoustical board that adds one deck sound-absorbing mat behind straight flute, back side perforation, the backboard again with medium density fibreboard or light particleboard as the front of base material.Its sound absorption principle mainly is to utilize perforation and groove on the sheet material to form sound absorption construction, and the wave absorption that enters in it is fallen.The major defect of this structure is that the selectivity of frequency is strong, and promptly sound sucting band is narrow, only just can have sound absorbing capabilities preferably near resonance frequency, and off-resonance frequence, the then obvious variation of acoustically effective.
In addition, also having a kind of Helmholtz resonator structure acoustical board, is a cuboid substrate, the manhole that has the front and back perforation in a lateral direction at substrate, described substrate vertically be provided with some borings or slit, it is connected with cross through hole is vertical, forms some helmholtz resonance bodies jointly.When size and the length of narrow slit and width of boring has different specifications simultaneously, just can absorb the noise of different frequency sound wave, to reach better acoustically effective.As Fig. 1 b, expression helmholtz resonance body sound absorption construction (helmholtz resonance body) is made up of big cavity and narrow eck, and the material space outerpace is connected by narrow bottleneck with internal cavity, and wherein d represents the circular hole aperture, and L is the degree of depth of neck, and V represents cavity volume.Many helmholtz resonances body sound absorption construction is formed in parallel by a plurality of single Helmholtz resonators, as Fig. 1 a.Under the effect of sound wave, the air column in the pore-throat is reciprocating just as piston, and the air of opening part vibration makes part acoustic energy be converted into heat energy owing to friction is blocked.Be formed in parallel by a plurality of single hole resonant cavities, but this structure also has its intrinsic shortcoming, promptly just existing sheet material is carried out the processing of Helmholtz resonator type, cause certain wasting of resources and cost to improve, and be not easy to processing, and, can't improve the cavity volume rate only in a plate processing helmholtz resonance chamber, the cavity volume rate is too big, and the working strength of Helmholtz resonance acoustic board just can't guarantee.
Summary of the invention
The present invention exists in order to solve existing acoustical board that the cavity volume rate is little, sound sucting band is narrow, the problem of acoustically effective difference, and then provides a kind of many Helmholtz resonators parallel connection type cellular sandwich wooden acoustical board.
The technical solution adopted for the present invention to solve the technical problems is: the wooden acoustical board of many Helmholtz resonators parallel connection type cellular sandwich of the present invention comprises panel, sandwich layer and backboard, and sandwich layer is clipped between panel and the backboard and the three links together; Described sandwich layer is cellular sandwich layer (honeycomb core), and described cellular sandwich layer is made of for the hexagon cylindrical shell is stitched together several cross sections, and each cross section is that the inner chamber of hexagon cylindrical shell is a honeycomb chamber; The cavity volume rate of described sandwich layer (the cavity volume rate equals the percentage that the volume sum of all cavitys in the sandwich layer accounts for the sandwich layer volume) is greater than 90%, have several perforation (small through hole) on the described panel, the area of the perforation shape that the outline line of each perforation surrounds is less than 1/4th of the hex area on the sandwich layer corresponding with it, and the honeycomb chamber of the opposite position on each perforation and the sandwich layer is connected on the panel.
The present invention has following beneficial effect:
The sandwich layer that the present invention is clipped between perforated panel and the backboard centre is cellular sandwich layer (cellular sandwich), because cellular sandwich is a kind of regular hexagon rock-steady structure, link together with panel and backboard, become a kind of force structure that is similar to countless i beam aggregates, sandwich layer is equivalent to the web of i beam, panel is equivalent to the wing plate of i beam, has good bearing capacity, has the high-strength characteristics of light weight.The more important thing is, sound absorption construction of the present invention and Helmholtz resonator principle are closely agreed with, this honeycomb sandwich structure has high cavity volume rate, and then greatly improved sound absorption coefficient, make resonance frequency move, and the variation of perforation parameter and cellular sandwich layer (honeycomb cardboard) thickness can reach the purpose of widening sound sucting band to the low frequency direction.Simultaneously, the wooden acoustical board of this many Helmholtz resonators parallel connection type cellular sandwich does not contain the material to environment and human body harmful such as sound-absorbing mat, and environmental-protecting performance is better.In addition, by introducing the high-strength cellular sandwich material of light weight, be combined to form the problem that Helmholtz resonator type sound absorption construction has overcome the timber resources that a kind of Helmholtz resonance acoustic board caused waste with perforated panel.
Acoustical board of the present invention has realized adopting other material except that timber to make acoustical board owing to adopt the sandwich type structure.Not only save timber resources, widened sound sucting band, and light weight, high-strength, environmental protection, harmless health, simple in structure, be convenient to construction, manufacture craft is simple, cost is low.
Design concept of the present invention is that the mechanism of the structure of the wooden acoustical board of perforate and cellular board is combined, by processing simply and being connected, structure and Helmholtz resonator principle after the combination are closely agreed with, improve acoustically effective and strengthen targets such as decorative effect thereby reach.Through standing-wave-tube method sound absorption coefficient test, this acoustical board has the sound sucting band of broad and high frequency sound absorbing capabilities preferably, and the high acoustic absorption coefficient at 500Hz, 1000Hz and 2000Hz place reaches 0.8,0.9 and 0.7 respectively, and acoustically effective is good.In addition, structural form of the present invention also has characteristics such as light weight, ratio of strength to weight height.The present invention can be applicable to the indoor place (being used for architecture indoor metope and furred ceiling) that architectural design has higher requirements to acoustics, as assembly hall, Conference Hall, wait (car) Room and hotel, restaurant, school, hospital, household etc.
Description of drawings
Fig. 1 a is the structural representation of Helmholtz resonator principle acoustical board (helmholtz resonance body), the enlarged drawing of a single hole resonant cavity among Fig. 1 b presentation graphs 1a; Fig. 2 a is a decomposing schematic representation of the present invention, and Fig. 2 b is a stereogram of the present invention; Fig. 3 is the vertical view of Fig. 2 b; Fig. 4 is the left view of Fig. 3; Fig. 5 be the present invention papery cellular sandwich thickness be the aperture of 10mm, the thick 3.5mm of medium density fiber panel, perforation be 6mm, perforated percentage be 3% situation under, frequency is the sound absorption spectrogram between 125～4000Hz, abscissa is represented frequency among Fig. 5, unit is hertz (Frequency/Hz), ordinate is represented sound absorption coefficient (sound absorptionratio/%), down together; Fig. 6 is that the present invention is 20mm at papery cellular sandwich thickness, the thick 3.5mm of medium density fiber panel, and the aperture of perforation is 4mm, perforated percentage is that frequency is the sound absorption spectrogram between 125～4000Hz under 3% the situation; Fig. 7 is that product of the present invention is 30mm at papery cellular sandwich thickness, the thick 3.5mm of medium density fiber panel, and the aperture of perforation is 6mm, perforated percentage is that frequency is the sound absorption spectrogram between 125～4000Hz under 6% the situation; Fig. 8 is that product of the present invention is 40mm at papery cellular sandwich thickness, the thick 3.5mm of medium density fiber panel, and the aperture of perforation is 6mm, perforated percentage is that frequency is the sound absorption spectrogram between 125～4000Hz under 3% the situation; Fig. 9 is that product of the present invention is 50mm at papery cellular sandwich thickness, the thick 3.5mm of medium density fiber panel, and the aperture of perforation is 6mm, perforated percentage is that frequency is the sound absorption spectrogram between 125～4000Hz under 3% the situation.
The specific embodiment
The specific embodiment one: as Fig. 2 a, Fig. 2 b, Fig. 3 and shown in Figure 4, the wooden acoustical board of the described many Helmholtz resonators parallel connection type of present embodiment cellular sandwich comprises panel 1, sandwich layer 2 and backboard 3, and sandwich layer 2 is clipped between panel 1 and the backboard 3 and the three links together; Described sandwich layer 2 is cellular sandwich layer (honeycomb core), and described cellular sandwich layer is made of for the hexagon cylindrical shell is stitched together several cross sections, and each cross section is that the inner chamber of hexagon cylindrical shell is a honeycomb chamber; The cavity volume rate of described sandwich layer 2 (the cavity volume rate equals the percentage that the volume sum of all cavitys in the sandwich layer accounts for the sandwich layer volume) is greater than 90%, have several perforation (small through hole) 1-1 on the described panel 1, the area of the perforation shape that surrounds of outline line of each perforation 1-1 is less than 1/4th of the hex area on the sandwich layer 2 corresponding with it, and the honeycomb chamber of the opposite position on each perforation 1-1 and the sandwich layer 2 is connected on the panel 1.
The specific embodiment two: the perforated percentage of the described panel 1 of present embodiment (hole area accounts for the percentage of plate area) is 3～10%.Through experimental results show that many times, the cavity volume rate is that panel 1 these two technical datas of 3～10% combine greater than 90% sandwich layer 2 and perforated percentage, greatly improved sound absorption coefficient, under the constant situation of panel 1 and sandwich layer 2, selecting the cavity volume rate is that panel 1 these two technical datas of 3～10% combine greater than 90% sandwich layer 2 and perforated percentage, and sound absorption coefficient can improve 8%～10%.Panel 1 can be bored a hole according to certain pattern form.Other composition and annexation are identical with the specific embodiment one.
The specific embodiment three: as shown in Figure 3, each perforation 1-1 is a circular hole in the present embodiment, and the aperture of described circular hole (diameter) is 1～10mm.Other composition and annexation are identical with the specific embodiment one or two.
The specific embodiment four: the described panel 1 of present embodiment is thickness 3～20mm.Other composition and annexation are identical with the specific embodiment three.
The specific embodiment five: the described sandwich layer 2 of present embodiment is thickness 6～100mm.Other composition and annexation are identical with the specific embodiment four.
The specific embodiment six: a kind of in wood based panel (wood material plate), bamboo wood jigsaw, veneer, shaving board (shaving board that has facing), fiberboard (or medium density fibreboard) or the wood-plastic clad plate of the described panel of present embodiment 1.Other composition and annexation are identical with the specific embodiment one.
The specific embodiment seven: the described sandwich layer 2 of present embodiment is a kind of in the cellular sandwich layer of papery, aluminum alloy honeycomb shape sandwich layer or the frp honeycomb shape sandwich layer.Described sandwich layer 2 also can be made up of the different polylith cellular board of honeycomb aperture monolithic cellular board of the same size or honeycomb aperture.Other composition and annexation are identical with the specific embodiment one, two, four, five or six.
The specific embodiment eight: as shown in Figure 1, an end face of the described sandwich layer 2 of present embodiment bonds together by adhesive and panel 1, and another end face of sandwich layer 2 bonds together by adhesive and backboard 3.Described adhesive can adopt common adhesive or adopt the environment-friendly type adhesive of carpenter and furniture industry, also can be urea-formaldehyde resin adhesive, phenolic resin glue, melamine resin adehsive, melamine urea-formaldehyde resin glue and epoxide-resin glue, polyurethane resin adhesive, mylar glue etc.Other composition and annexation are identical with the specific embodiment seven.
The specific embodiment nine: as Fig. 2 a, Fig. 2 b, Fig. 3 and shown in Figure 4, the described acoustical board of present embodiment also comprises support structure plate 4; Described structural support 4 is arranged on the periphery (section) of the composite plate that is formed by panel 1, sandwich layer 2 and backboard 3 threes; Or described structural support 4 is provided with the peripheral and inner of the composite plate that formed by panel 1, sandwich layer 2 and backboard 3 threes.Other composition and annexation are identical with the specific embodiment one, two, four, five, six or eight.
First kind of situation in the above-mentioned embodiment is fit to the less situation of profile physical dimension of the wooden acoustical board of sandwich, and the plate face of support structure plate 4 is all vertical with backboard 3 with panel 1, sandwich layer 2.
Second kind of situation in the above-mentioned embodiment is fit to the bigger situation of profile physical dimension of the wooden acoustical board of sandwich, is positioned at inner support structure plate 4 and runs through middle sandwich layer 2 as supporting member.Support structure plate 4 is all vertical with backboard 3 with panel 1, sandwich layer 2.
Described support structure plate 4 can be processed by natural timber or wood-based plate etc. for the wood materials of certain mechanical strength is arranged.Support structure plate 4 can be connected on the peripheral section of the composite plate that panel 1, sandwich layer 2 and backboard 3 threes form or inner by adhesive and screw.Support structure plate 4 usefulness adhesives connect as around framework, support structure connector counter plate, backboard and cellular sandwich play effects such as fixing, support all around, improve the working strength of described acoustical board greatly.
The specific embodiment ten: the perforation 1-1 on the described panel 1 of present embodiment combines and constitutes the pattern of different shape.Being shaped as of described perforation 1-1 is various.Other composition and annexation are identical with the specific embodiment one or two.
Operating principle:
Embodiment 1 (referring to Fig. 5):
The wooden acoustical board of many Helmholtz resonators parallel connection type cellular sandwich comprises: panel 1, sandwich layer 2, backboard 3 and support structure connector 4 are composited by adhesive and screw;
The papery cellular sandwich thickness that present embodiment adopted is 10mm, and the thickness of medium density fiber panel is 3.5mm, and the aperture of perforation is 6mm, and perforated percentage is 3%.Backboard is selected wooden boards for use.The perforation of panel 1 is connected with the honeycomb chamber of intermediate core layer 2, and sandwich layer 2 is clipped between panel 1 and the backboard 3, and support structure connector 4 runs through intermediate core layer 2 as supporting member and is connected and fixed with adhesive or screw.Through experiment test, be between 500～4000Hz the time in frequency, sound absorption coefficient is 0.20～0.67.
Embodiment 2 (referring to Fig. 6):
The wooden acoustical board of many Helmholtz resonators parallel connection type cellular sandwich comprises: panel 1, sandwich layer 2, backboard 3 and support structure connector 4 are composited by adhesive and screw;
The papery cellular sandwich thickness that present embodiment adopted is 20mm, and the thickness of medium density fiber panel is 3.5mm, and the aperture of perforation is 4mm, and perforated percentage is 3%.Backboard is selected wooden boards for use.The perforation of panel 1 is connected with the honeycomb chamber of intermediate core layer 2, and sandwich layer 2 is clipped between panel 1 and the backboard 3, and support structure connector 4 runs through intermediate core layer 2 as supporting member and is connected and fixed with adhesive or screw.Through experiment test, be between 400～4000Hz the time in frequency, sound absorption coefficient is 0.20～0.94.
Embodiment 3 (referring to Fig. 7):
The wooden acoustical board of many Helmholtz resonators parallel connection type cellular sandwich comprises: panel 1, sandwich layer 2, backboard 3 and support structure connector 4 are composited by adhesive and screw;
The papery cellular sandwich thickness that present embodiment adopted is 30mm, and the thickness of medium density fiber panel is 3.5mm, and the aperture of perforation is 6mm, and perforated percentage is 6%.Backboard is selected wooden boards for use.The perforation of panel 1 is connected with the honeycomb chamber of intermediate core layer 2, and sandwich layer 2 is clipped between panel 1 and the backboard 3, and support structure connector 4 runs through intermediate core layer 2 as supporting member and is connected and fixed with adhesive or screw.Through experiment test, be between 400～4000Hz the time in frequency, sound absorption coefficient is 0.20～0.94.
Embodiment 4 (referring to Fig. 8):
The wooden acoustical board of many Helmholtz resonators parallel connection type cellular sandwich comprises: panel 1, sandwich layer 2, backboard 3 and support structure connector 4 are composited by adhesive and screw;
The papery cellular sandwich thickness that present embodiment adopted is 40mm, and the thickness of medium density fiber panel is 3.5mm, and the aperture of perforation is 6mm, and perforated percentage is 3%.Backboard is selected wooden boards for use.The perforation of panel 1 is connected with the honeycomb chamber of intermediate core layer 2, and sandwich layer 2 is clipped between panel 1 and the backboard 3, and support structure connector 4 runs through intermediate core layer 2 as supporting member and is connected and fixed with adhesive or screw.Through experiment test, be between 180～4000Hz the time in frequency, sound absorption coefficient is 0.20～0.99.
Embodiment 5 (referring to Fig. 9):
The wooden acoustical board of many Helmholtz resonators parallel connection type cellular sandwich comprises: panel 1, sandwich layer 2, backboard 3 and support structure connector 4 are composited by adhesive and screw;
The papery cellular sandwich thickness that present embodiment adopted is 50mm, and the thickness of medium density fiber panel is 3.5mm, and the aperture of perforation is 6mm, and perforated percentage is 3%.Backboard is selected wooden boards for use.The perforation of panel 1 is connected with the honeycomb chamber of intermediate core layer 2, and sandwich layer 2 is clipped between panel 1 and the backboard 3, and support structure connector 4 runs through intermediate core layer 2 as supporting member and is connected and fixed with adhesive or screw.Through experiment test, be between 130～4000Hz the time in frequency, sound absorption coefficient is 0.20～0.80.
Claims (10)
1. the wooden acoustical board of the cellular sandwich of Helmholtz resonator parallel connection type more than a kind, described acoustical board comprises panel (1), sandwich layer (2) and backboard (3), sandwich layer (2) is clipped between panel (1) and the backboard (3) and the three links together; It is characterized in that: described sandwich layer (2) is cellular sandwich layer, and described cellular sandwich layer is made of for the hexagon cylindrical shell is stitched together several cross sections, and each cross section is that the inner chamber of hexagon cylindrical shell is a honeycomb chamber; The cavity volume rate of described sandwich layer (2) is greater than 90%, have several perforation (1-1) on the described panel (1), the area of the perforation shape that the outline line of each perforation (1-1) surrounds is less than 1/4th of the hex area on the sandwich layer corresponding with it (2), and the honeycomb chamber that panel (1) is gone up the opposite position on each perforation (1-1) and the sandwich layer (2) is connected.
2. the wooden acoustical board of many Helmholtz resonators parallel connection type cellular sandwich according to claim 1, it is characterized in that: the perforated percentage of described panel (1) is 3～10%.
3. the wooden acoustical board of many Helmholtz resonators parallel connection type cellular sandwich according to claim 1 and 2 is characterized in that: each perforation (1-1) is a circular hole, and the aperture of described circular hole is 1～10mm.
4. the wooden acoustical board of many Helmholtz resonators parallel connection type cellular sandwich according to claim 3 is characterized in that: described panel (1) is thickness 3～20mm.
5. the wooden acoustical board of many Helmholtz resonators parallel connection type cellular sandwich according to claim 4 is characterized in that: described panel (1) is a kind of in wood based panel, bamboo wood jigsaw, veneer, shaving board, fiberboard or the wood-plastic clad plate.
6. according to the wooden acoustical board of described many Helmholtz resonators of 1 parallel connection type of claim cellular sandwich, it is characterized in that: described sandwich layer (2) is thickness 6～100mm.
7. according to claim 1,2,4, the wooden acoustical board of 5 or 6 described many Helmholtz resonators parallel connection type cellular sandwich, it is characterized in that: a kind of in the cellular sandwich layer of papery, aluminum alloy honeycomb shape sandwich layer or the frp honeycomb shape sandwich layer of described sandwich layer (2).
8. the wooden acoustical board of many Helmholtz resonators parallel connection type cellular sandwich according to claim 7, it is characterized in that: an end face of sandwich layer (2) bonds together by adhesive and panel (1), and another end face of sandwich layer (2) bonds together by adhesive and backboard (3).
9. according to claim 1,2,4,5, the wooden acoustical board of 6 or 8 described many Helmholtz resonators parallel connection type cellular sandwich, it is characterized in that: described acoustical board also comprises support structure plate (4); Described structural support (4) is arranged on the periphery of the composite plate that is formed by panel (1), sandwich layer (2) and backboard (3) three; Or described structural support (4) is provided with the peripheral and inner of the composite plate that formed by panel (1), sandwich layer (2) and backboard (3) three.
10. the wooden acoustical board of many Helmholtz resonators parallel connection type cellular sandwich according to claim 1 and 2 is characterized in that: the perforation (1-1) on the described panel (1) combines and constitutes the pattern of different shape.
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| CN 201010291586 CN101962980A (en) | 2010-09-26 | 2010-09-26 | Multiple helmholtz resonator parallel cellular sandwich wood sound absorption plate |
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| CN102294847A (en) * | 2011-07-19 | 2011-12-28 | 东北林业大学 | Variable cross-section perforated broadband acoustic board with double core layers |
| CN102312489A (en) * | 2011-07-19 | 2012-01-11 | 东北林业大学 | Light broad band sound-absorption board |
| CN103700366A (en) * | 2013-12-24 | 2014-04-02 | 江苏大学 | Wideband sound absorption structure combing mechanical impedance of composite resonance cavities with micropunch plates |
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| CN102294847A (en) * | 2011-07-19 | 2011-12-28 | 东北林业大学 | Variable cross-section perforated broadband acoustic board with double core layers |
| CN102312489A (en) * | 2011-07-19 | 2012-01-11 | 东北林业大学 | Light broad band sound-absorption board |
| CN103700366A (en) * | 2013-12-24 | 2014-04-02 | 江苏大学 | Wideband sound absorption structure combing mechanical impedance of composite resonance cavities with micropunch plates |
| CN103970935A (en) * | 2013-12-24 | 2014-08-06 | 华电重工股份有限公司 | Method for identifying noise source in waste heat boiler |
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