CN104538022A - Acoustic shield based on acoustic wave band gap features of generalized photonic crystal semi-cylinder shells - Google Patents
Acoustic shield based on acoustic wave band gap features of generalized photonic crystal semi-cylinder shells Download PDFInfo
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- CN104538022A CN104538022A CN201410827038.6A CN201410827038A CN104538022A CN 104538022 A CN104538022 A CN 104538022A CN 201410827038 A CN201410827038 A CN 201410827038A CN 104538022 A CN104538022 A CN 104538022A
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Abstract
The invention provides an acoustic shield based on acoustic wave band gap features of generalized photonic crystal semi-cylinder shells. The acoustic shield based on the acoustic wave band gap features of the generalized photonic crystal semi-cylinder shells comprises a shield body. The shield body is a square shell formed by connecting five base boards. The bottom end of the shield body is provided with a bottom edge connecting plate. The bottom edge connecting plate is provided with a threaded hole. The shield body is connected with a base through the bottom edge connecting plate. The inner surface of each base board is evenly provided with at least two semi-cylinder grooves. Each semi-cylinder groove is provided with the generalized photonic crystal semi-cylinder shell. Each generalized photonic crystal semi-cylinder shell is provided with at least two period components from inside to outside. Each period unit is composed of a non-metal layer and a metal layer from inside to outside in sequence, and each non-metal layer and the corresponding metal layer are attached to each other. Every two adjacent period components are attached to each other. The acoustic shield has the advantages of being large in sound insulation factor, convenient to assemble, disassemble and transport, low in design and manufacturing cost and the like. The acoustic shield has good damping and noise reduction effect on vibration within a band gap range.
Description
Technical field
The present invention relates to a kind of sound arrester, particularly relate to a kind of acoustic hood based on broad sense phonon crystal attached column shell acoustic band gap characteristic.
Background technology
Along with growth in the living standard, people are also more and more higher to being in environmental quality requirement, and for improving acoustic environment, increasing noise control method is able to application and research.In practical engineering application, Noise measarement mainly contains three kinds of approach: (1), to the control of sound source, namely starts with from sound source, improves the structural design of sound source, reduces the noise grade that sound source sends; (2) to the defense controls of sound field recipient, namely the certain safeguard measure protection of taking referring to be exposed to people in noise circumstance artificial oneself does not come to harm, generally can by wearing ear protectors, reducing the safeguard procedures such as the time be exposed in noise circumstance; (3) route of transmission controls, and is namely reduced the Propagation of Energy of sound wave by noise reduction measures such as sound absorption, sound insulation, noise eliminations.
Because noise source is a lot, be very difficult from the generation of control noises source, so the method for conventional passive vibration and noise reducing suppresses the propagation of harmful vibration noise in engineering, such as on route of transmission, take sound insulation process to intercept it and propagate.With regard to existing opacity technique, acoustic hood is the most easily realization, most economical control mode in Noise measarement.Noise source is enclosed in cover by acoustic hood, to reduce peripherad sound radiation.The agent structure of acoustic hood is cover wall, this just requires that cover wall must have enough oise insulation factors to hinder sound wave propagation, according to the mass action law, the larger soundproof effect of cover wall density is better, therefore cover wall adopts heavy material to manufacture mostly, as fragment of brick, mixed earth, marble, plasterboard, steel etc.In Practical Project, need to carry out inspection and maintenance regularly to sound arrester and sound source device, usually require that acoustic hood should lightly facilitate, be convenient to mounting or dismounting and transport, but its structure of existing acoustic hood is too heavy, cannot meet above-mentioned requirements.
The noise adopting existing opacity technique no doubt can make to be delivered to vibration on structure and radiation thereof has certain decay, but the noise produced when a lot of pressurized equipment runs at present is very big, with regard to existing acoustic hood, oise insulation factor is less, can not meet the demands far away.Chinese patent (Authorization Notice No. CN203583695U) provide a kind of modular assembly type acoustic hood, be made up of framed structure, composite plate module, framed structure is made up of load steel construction, mounting groove structure, the form-factor of composite plate module is unified, comprises the forms such as compound sound absorption module, soundproof door module.
Summary of the invention
The object of the invention is to make that the oise insulation factor of acoustic hood is large, dismounting is easier and provide a kind of acoustic hood based on broad sense phonon crystal attached column shell acoustic band gap characteristic.
The object of the present invention is achieved like this: comprise matrix cover, matrix cover is interconnected by five parent plates the square casing formed, and matrix cover bottom arranges base web joint, base web joint arranges threaded hole, matrix cover is connected with pedestal by base web joint, the inside surface of each parent plate is evenly provided with at least two semicolumn grooves, each semicolumn groove installs a broad sense phonon crystal attached column shell, each broad sense phonon crystal attached column shell at least arranges two cycle constituent elements from the inside to the outside, each cycle constituent element is non-metallic layer and metal level from the inside to the outside successively, and non-metallic layer and metal level are bonded to each other, bonded to each other between each cycle constituent element.
The present invention also comprises some architectural features like this:
1. 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, the first metal layer, the second non-metallic layer, the second metal level, the 3rd non-metallic layer and the 3rd metal level from the inside to the outside successively, bonded to each other between each layer.
Compared with prior art, the invention has the beneficial effects as follows: broad sense phonon crystal attached column shell is incorporated in acoustic enclosure structure by the present invention, the acoustic band gap utilizing it to produce is to suppress the propagation of sound wave in crystal cover, and by regulating the structural parameters of broad sense phonon crystal attached column shell, material parameter, quantity and the size of cycle constituent element change band gap locations, band gap width and oise insulation factor, and the object of vibration and noise reducing can be realized within the scope of bandgap frequency, the present invention and existing opacity technique have essential distinction, there is oise insulation factor large, be convenient to mounting or dismounting and transport, the advantage that the low use of design and manufacture cost is reliable and low to operating environment requirements.
Accompanying drawing explanation
Fig. 1 is external structure schematic diagram of the present invention;
Fig. 2 is the structural representation of matrix cover of the present invention;
Fig. 3 is 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 that the present invention has the broad sense phonon crystal attached column shell of three cycle constituent elements;
Fig. 6 is structural representation parent plate of the present invention being installed broad sense phonon crystal attached column shell.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the present invention is described in further detail.
The present invention is mainly for the sound insulation of medium-high frequency territory sound source, and the present invention is acoustic band gap characteristic based on broad sense phonon crystal attached column shell 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, (the namely periodically radial) effect that disappears mutually is reflected at interphase place due to its inner different impedance operator, form acoustic band gap, this band gap has the propagation characteristic of control wave, and then inhibits the sound wave within the scope of corresponding frequencies to propagate in crystal.The present invention can realize the object of the significantly vibration and noise reducing within the scope of bandgap frequency.
Case study on implementation one: composition graphs 1 to Fig. 6, the present invention includes matrix cover 1, matrix cover 1 is interconnected by five parent plates 4,5,6,7,8 square casing formed, namely also matrix cover 1 to be connected by some bolts 3 by parent plate 4,5,6,7,8 and formed, and matrix cover is the agent structure of acoustic hood.And matrix cover 1 bottom arranges base web joint 17, base web joint 17 is arranged threaded hole 15, matrix cover 1 is connected with pedestal by base web joint 17, also namely acoustic hood and pedestal are linked together by the mode of the connection of bolt by the present invention, the inside surface of each parent plate is evenly provided with at least two semicolumn grooves 16, also namely semicolumn groove 16 is in column on basic plate is evenly arranged, spacing between semicolumn groove with semicolumn groove is equal, and each semicolumn groove 16 installs a broad sense phonon crystal attached column shell 2, the broad sense phonon crystal attached column shell 2 of at least two that such realization is evenly distributed on the inside surface of each parent plate, each broad sense phonon crystal attached column shell 2 at least arranges two cycle constituent elements from the inside to the outside, each cycle constituent element is non-metallic layer and metal level from the inside to the outside successively, and non-metallic layer and metal level are bonded to each other, bonded to each other between each cycle constituent element.
Broad sense phonon crystal attached column shell 2 of the present invention is alternately connected by the coaxial cable attached column shell of two kinds of unlike materials and formed, semicolumn groove 16 periodic arrangement on the inside surface of parent plate 4,5,6,7,8, the laminating between the laminating between each layer of phonon crystal, each cycle constituent element is all adopt swelling, adhesion or other rational processes.Quantity and the size of the physical dimension of broad sense phonon crystal attached column shell, material parameter, cycle constituent element can adjust according to the needs of environment for use, thus change band gap locations, band gap width and oise insulation factor.
Case study on implementation two: composition graphs 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, second non-metallic layer 11, second metal level 12, the 3rd non-metallic layer 13 and the 3rd metal level 14 from the inside to the outside successively, bonded to each other between each layer, the broad sense phonon crystal attached column shell with three cycle constituent elements is that the nonmetal attached column shell 9,11,13 of employing three layers and three-layer metal attached column shell 10,12,14 are alternately linked together by swelling, adhesion or other rational processes.
The present invention should be taken into account following several factor when reality uses:
1. the material of matrix cover and cycle constituent element.Different according to working environment, the constituent element of matrix cover and composition broad sense phonon crystal attached column shell can select different materials.Such as nonmetallic materials can adopt nylon, reinforced nylon, polyphenylene sulfide, polymer composites etc., and metal material can adopt steel, aluminium and various alloys etc.
2. the quantity of cycle constituent element and physical dimension.Can the quantity of adjustment cycle constituent element and physical dimension according to the requirement such as physical dimension, frequency band range.
3. the connection of acoustic hood and pedestal.Stronger structure-borne sound imports in acoustic hood can become sound radiation source, thus greatly reduces defening effect, and oise insulation factor is reduced.For acoustic hood is passed in the vibration avoided or reduce support, vibration isolator should be installed in the junction of acoustic hood and pedestal, and the necessary junction of acoustic hood and equipment should adopt elasticity to be flexible coupling as far as possible.
Should be noted that above embodiment only in order to the present invention to be described and unrestricted, the present invention is also not limited in above-mentioned citing.All do not depart from technical scheme and the improvement thereof of the spirit and scope of the present invention, and it all should be encompassed in right of the present invention.
Claims (2)
1. the acoustic hood based on broad sense phonon crystal attached column shell acoustic band gap characteristic, comprise matrix cover, matrix cover is interconnected by five parent plates the square casing formed, and matrix cover bottom arranges base web joint, base web joint arranges threaded hole, matrix cover is connected with pedestal by base web joint, it is characterized in that: on the inside surface of each parent plate, be evenly provided with at least two semicolumn grooves, each semicolumn groove installs a broad sense phonon crystal attached column shell, each broad sense phonon crystal attached column shell at least arranges two cycle constituent elements from the inside to the outside, each cycle constituent element is non-metallic layer and metal level from the inside to the outside successively, and non-metallic layer and metal level are bonded to each other, bonded to each other between each cycle constituent element.
2. a kind of acoustic hood based on broad sense phonon crystal hemispherical Shell acoustic band gap characteristic according to claim 1, it is characterized in that: 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, the first metal layer, the second non-metallic layer, the second metal level, the 3rd non-metallic layer and the 3rd metal level from the inside to the outside successively, bonded to each other between each layer.
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| 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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Cited By (2)
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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 |
| CN111236457A (en) * | 2020-01-09 | 2020-06-05 | 哈尔滨工程大学 | Sound barrier for reducing sound energy loss |
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| 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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