CN104538022B - A kind of acoustic hood based on broad sense phonon crystal attached column shell acoustic band gap characteristic - Google Patents
A kind of acoustic hood based on broad sense phonon crystal attached column shell acoustic band gap characteristic Download PDFInfo
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- CN104538022B CN104538022B CN201410827038.6A CN201410827038A CN104538022B CN 104538022 B CN104538022 B CN 104538022B CN 201410827038 A CN201410827038 A CN 201410827038A CN 104538022 B CN104538022 B CN 104538022B
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Abstract
The present invention is to provide a kind of acoustic hood based on broad sense phonon crystal attached column shell acoustic band gap characteristic, including matrix cover, matrix cover is connected with each other the square casing constituted by five parent plates, and matrix cover bottom sets base connecting plate, hole is threaded on the connecting plate of base, matrix cover is connected by base connecting plate with pedestal, at least two semicolumn grooves are evenly arranged with the inner surface of each parent plate, each semicolumn groove installs a broad sense phonon crystal attached column shell, each broad sense phonon crystal attached column shell is from the inside to the outside at least provided with two cycle constituent elements, each cycle constituent element is non-metallic layer and metal level successively from the inside to the outside, and non-metallic layer and metal level are bonded to each other, it is bonded to each other between each cycle constituent element.The present invention has that oise insulation factor is big, is easy to assemble and disassemble and transports, the low advantage of design and manufacture cost, and the present invention is to effect of the vibration with good vibration and noise reducing in bandgap range.
Description
Technical field
Broad sense phonon crystal attached column shell acoustic band gap characteristic is based on the present invention relates to a kind of sound arrester, more particularly to one kind
Acoustic hood.
Background technology
With the improvement of living standards, people are to being in environmental quality requirement also more and more higher, it is more next to improve acoustic environment
More noise control methods are able to apply and studied.In practical engineering application, Noise measarement mainly has three kinds of approach：(1)
Control to sound source, i.e., start with from sound source, improves the structure design of sound source, reduces the noise grade that sound source is sent；(2) to sound field
The defense controls of recipient, that is, refer to the people in noise circumstance artificially take certain safeguard measure to protect oneself not
Come to harm, typically can be by wearing ear defenders, reducing the safeguard procedures such as the time being exposed in noise circumstance；(3) propagate
Approach is controlled, i.e., reduce the propagation energy of sound wave by noise reduction measures such as sound absorption, sound insulation, noise eliminations.
Because noise source is a lot, the generation that noise is controlled from source is extremely difficult, so being commonly used in engineering
The method of passive vibration and noise reducing suppresses the propagation of harmful vibration noise, such as on route of transmission, takes sound insulation processing resistance
Every its propagation.For existing opacity technique, acoustic hood is most easy realization, most economical control mode in Noise measarement.Sound insulation
Noise source is enclosed in cover by cover, to reduce peripherad acoustic radiation.The agent structure of acoustic hood is cover wall, and this requires cover wall
There must be enough oise insulation factors to hinder the propagation of sound wave, it can be seen from the law of mass action, the bigger soundproof effect of cover wall density
It is better, therefore cover wall is manufactured using heavy material mostly, such as fragment of brick, mixed mud, marble, plasterboard, steel.In actual work
, it is necessary to periodically being overhauled and being safeguarded to sound arrester and sound source device in journey, often require that acoustic hood should lightly facilitate,
It is easy to assemble and disassemble and transports, but its structure of existing acoustic hood is excessively heavy, can not meet above-mentioned requirements.
Can no doubt make to be delivered to the noise of the vibration on structure and its radiation using existing opacity technique has certain
Decay, but the noise produced at present when many pressurized equipments are run is greatly, and for existing acoustic hood, oise insulation factor is smaller,
Requirement far can not be met.Chinese patent (Authorization Notice No. CN203583695U) provides a kind of modular assembly type acoustic hood, by
Frame structure, compound plate module composition, frame structure are combined the profile of plate module by load steel construction, mounting groove structure composition
Uniform specification, including it is combined the forms such as sound absorption module, soundproof door module.
The content of the invention
The invention aims to make it that the oise insulation factor of acoustic hood is big, it is easier to dismount and provides one kind based on broad sense sound
The acoustic hood of sub- crystal attached column shell acoustic band gap characteristic.
The object of the present invention is achieved like this：Including matrix cover, matrix cover is connected with each other by five parent plates and constituted
Square casing, and matrix cover bottom sets base connecting plate, is threaded hole on the connecting plate of base, matrix cover is connected by base
Fishplate bar is connected with pedestal, and at least two semicolumn grooves, each semicolumn groove are evenly arranged with the inner surface of each parent plate
One broad sense phonon crystal attached column shell is installed, each broad sense phonon crystal attached column shell is from the inside to the outside at least provided with two periodic groups
Member, each cycle constituent element is non-metallic layer and metal level successively from the inside to the outside, and non-metallic layer and metal level be it is bonded to each other,
It is bonded to each other between each cycle constituent element.
Present invention additionally comprises some such architectural features：
1. each broad sense phonon crystal attached column shell has three cycle constituent elements, each broad sense phonon crystal attached column shell is from the inside to the outside
It is the first non-metallic layer, the first metal layer, the second non-metallic layer, second metal layer, the 3rd non-metallic layer and the 3rd metal successively
It is bonded to each other between layer, each layer.
Compared with prior art, the beneficial effects of the invention are as follows：The present invention by broad sense phonon crystal attached column shell be incorporated into every
In acoustic shell structure, propagation of the sound wave in crystal cover is suppressed using the acoustic band gap of its generation, and can be by adjusting broad sense sound
Structural parameters, material parameter, the quantity of cycle constituent element and the size of sub- crystal attached column shell come change band gap locations, band gap width with
And oise insulation factor, and the purpose of vibration and noise reducing can be realized in the range of bandgap frequency, it is of the invention that there is this with existing opacity technique
Matter is distinguished, with oise insulation factor it is big, be easy to assemble and disassemble and transport, design and manufacture cost it is low using reliable and low to operating environment requirements
Advantage.
Brief description of the drawings
Fig. 1 is the external structure schematic diagram of the present invention；
Fig. 2 is the structural representation of matrix cover of the present invention；
Fig. 3 is the general structure schematic diagram of the present invention；
Fig. 4 is the structural representation of parent plate of the present invention；
Fig. 5 is the structural representation for the broad sense phonon crystal attached column shell that the present invention has three cycle constituent elements；
Fig. 6 is the structural representation that broad sense phonon crystal attached column shell is installed on parent plate of the present invention.
Embodiment
The present invention is described in further detail with embodiment below in conjunction with the accompanying drawings.
The present invention is primarily directed to the sound insulation of medium-high frequency domain sound source, and the present invention is the sound based on broad sense phonon crystal attached column shell
Ripple band gap properties and the acoustic hood designed.Its principle is along nonmetal basal body plate X-direction periodic arrangement broad sense phonon crystal attached column
Shell, when sound wave is propagated in broad sense phonon crystal attached column shell, due to reflecting phase at the interface of its internal different impedance operator
Disappear (i.e. radially periodically) effect, forms acoustic band gap, this band gap has the propagation characteristic of controls ripple, and then inhibits respective tones
Sound wave in the range of rate is propagated in crystal.The present invention can realize the mesh of the significantly vibration and noise reducing in the range of bandgap frequency
's.
Case study on implementation one：With reference to Fig. 1 to Fig. 6, the present invention includes matrix cover 1, matrix cover 1 be by five parent plates 4,5,6,
7th, 8 be connected with each other composition square casing, if namely matrix cover 1 institute's group is connected by bolt stem 3 by parent plate 4,5,6,7,8
Into matrix cover is the agent structure of acoustic hood.And the bottom of matrix cover 1 sets and set on base connecting plate 17, base connecting plate 17
Screwed hole 15, matrix cover 1 is connected by base connecting plate 17 with pedestal, namely the present invention will be every by way of the connection of bolt
Acoustic shell is linked together with pedestal, and at least two semicolumn grooves 16 are evenly arranged with the inner surface of each parent plate, namely
Semicolumn groove 16 is evenly arranged in column on basic plate, and the spacing between semicolumn groove and semicolumn groove is equal, and each
Semicolumn groove 16 installs a broad sense phonon crystal attached column shell 2, is achieved in that evenly distributed on the inner surface of each parent plate
At least two broad sense phonon crystal attached column shell 2, each broad sense phonon crystal attached column shell 2 is from the inside to the outside at least provided with two weeks
Phase constituent element, each cycle constituent element is non-metallic layer and metal level successively from the inside to the outside, and non-metallic layer and metal level are mutual patches
Close, be bonded to each other between each cycle constituent element.
The broad sense phonon crystal attached column shell 2 of the present invention is alternately to connect institute's group by the coaxial line attached column shell of two kinds of unlike materials
Into, the periodic arrangement on the inner surface of parent plate 4,5,6,7,8 of semicolumn groove 16, fitting, respectively between each layer of phonon crystal
Laminating between cycle constituent element is all to use swelling, adhesion or other rational processes.Broad sense phonon crystal attached column shell
Physical dimension, material parameter, the quantity of cycle constituent element and size can be according to being adjusted the need for use environment, so as to change
Band gap locations, band gap width and oise insulation factor.
Case study on implementation two：With reference to Fig. 5, each broad sense phonon crystal attached column shell has three cycle constituent elements, each broad sense phonon
Crystal attached column shell is the first non-metallic layer 9, the first metal layer 10, the second non-metallic layer 11, second metal layer successively from the inside to the outside
12nd, bonded to each other between the 3rd non-metallic layer 13 and the 3rd metal level 14, each layer, the broad sense phonon with three cycle constituent elements is brilliant
Body attached column shell be using three layers of nonmetallic attached column shell 9,11,13 and three-layer metal attached column shell 10,12,14 alternately by swelling,
Adhesion or other rational processes link together.
The present invention should be taken into account following several factors in actual use：
1. the material of matrix cover and cycle constituent element.It is different according to working environment, matrix cover and composition broad sense phonon crystal half
The constituent element of post shell can select different materials.For example nonmetallic materials can be using nylon, reinforced nylon, polyphenylene sulfide, poly-
Compound composite material etc., metal material can be using steel, aluminium and various alloys etc..
2. the quantity and physical dimension of cycle constituent element.Periodic groups can be adjusted according to requirements such as physical dimension, frequency band ranges
The quantity and physical dimension of member.
3. the connection of acoustic hood and pedestal.Acoustic radiation source can be become in the incoming acoustic hood of stronger structure-borne sound, so that
Defening effect is substantially reduced, oise insulation factor is reduced.Vibration to avoid or reducing support is transmitted to acoustic hood, acoustic hood and pedestal
Junction should install vibration isolator, and the necessary junction of acoustic hood and equipment should try one's best to be flexible coupling using elasticity.
It should be noted that above example is only to illustrate rather than limitation, the present invention is also not limited to above-mentioned
Citing.All technical schemes for not departing from the spirit and scope of the present invention and its improvement, it all should cover the right in the present invention
In claimed range.
Claims (2)
1. a kind of acoustic hood based on broad sense phonon crystal attached column shell acoustic band gap characteristic, including matrix cover, matrix cover is by five
Individual parent plate is connected with each other the square casing of composition, and matrix cover bottom sets and sets spiral shell on base connecting plate, base connecting plate
Pit, matrix cover is connected by base connecting plate with pedestal, it is characterised in that：It is uniformly arranged on the inner surface of each parent plate
There are at least two semicolumn grooves, each semicolumn groove installs a broad sense phonon crystal attached column shell, each broad sense phonon crystal half
Post shell is from the inside to the outside at least provided with two cycle constituent elements, and each cycle constituent element is non-metallic layer and metal level successively from the inside to the outside,
And non-metallic layer and metal level are bonded to each other, are bonded to each other between each cycle constituent element.
2. a kind of acoustic hood based on broad sense phonon crystal attached column shell acoustic band gap characteristic according to claim 1, it is special
Levy and be：Each broad sense phonon crystal attached column shell has three cycle constituent elements, each broad sense phonon crystal attached column shell from the inside to the outside according to
Secondary is the first non-metallic layer, the first metal layer, the second non-metallic layer, second metal layer, the 3rd non-metallic layer and the 3rd metal level,
It is bonded to each other between each layer.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410827038.6A CN104538022B (en) | 2014-12-25 | 2014-12-25 | A kind of acoustic hood based on broad sense phonon crystal attached column shell acoustic band gap characteristic |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410827038.6A CN104538022B (en) | 2014-12-25 | 2014-12-25 | A kind of acoustic hood based on broad sense phonon crystal attached column shell acoustic band gap characteristic |
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| CN104538022A CN104538022A (en) | 2015-04-22 |
| CN104538022B true CN104538022B (en) | 2017-08-04 |
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| CN106816145A (en) * | 2017-02-17 | 2017-06-09 | 清华大学 | A kind of steel compound noise reduction board and denoising device |
| CN111236457B (en) * | 2020-01-09 | 2021-04-20 | 哈尔滨工程大学 | Sound barrier for reducing sound energy loss |
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