CN104538019B - Generalized phonon crystal sound insulation cover - Google Patents
Generalized phonon crystal sound insulation cover Download PDFInfo
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- CN104538019B CN104538019B CN201410827052.6A CN201410827052A CN104538019B CN 104538019 B CN104538019 B CN 104538019B CN 201410827052 A CN201410827052 A CN 201410827052A CN 104538019 B CN104538019 B CN 104538019B
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Abstract
The invention provides a generalized phonon crystal sound-insulating cover which comprises a generalized phonon crystal column shell and a generalized phonon crystal semispherical shell connected with the generalized phonon crystal column shell, wherein a circular boss is arranged at the bottom end of the generalized phonon crystal column shell, a threaded hole is formed in the circular boss along the circumferential direction, the circular boss is connected with a base, at least two periodic components are arranged on the generalized phonon crystal column shell and the generalized phonon crystal semispherical shell from inside to outside, each periodic component is sequentially provided with a non-metal layer and a metal layer from inside to outside, the non-metal layer and the metal layer are mutually attached, and each periodic component is mutually attached. The invention has the advantages of large sound insulation, convenient assembly and disassembly, convenient transportation, low design and manufacturing cost and the like, and has good vibration reduction and noise reduction effects on vibration in the band gap range.
Description
Technical Field
The invention relates to a sound insulation device, in particular to a generalized phononic crystal sound insulation cover.
Background
At present, the industrial mechanical equipment produced in China rarely considers noise prevention and control in design and manufacture, so that strong noise is radiated in operation, and serious noise pollution is caused in workplaces, so that the health of workers is influenced, the labor efficiency is reduced, surrounding residential areas are affected, the production and life are continuously influenced, and even various defects are caused. Therefore, it is important to improve the living environment of people by reducing or reducing noise pollution.
In engineering practical application, noise control mainly has three approaches: (1) The control of the sound source, namely starting from the sound source, improves the design of the sound source structure and reduces the noise level emitted by the sound source; (2) The protection control of the sound field receiver means that people exposed in the noise environment manually take certain protection measures to protect the sound field receiver from being injured, and the protection measures such as wearing an ear protector, reducing the time of exposure in the noise environment and the like can be generally adopted; (3) And the propagation path is controlled, namely, the propagation energy of sound waves is reduced through noise reduction measures such as sound absorption, sound insulation, noise elimination and the like. Because of the large number of noise sources, it is very difficult to control the generation of noise from the sources, and therefore, a passive vibration damping and noise reduction method is commonly used in engineering to inhibit the transmission of harmful vibration noise, for example, in a transmission path, sound insulation treatment is adopted to block the transmission of the harmful vibration noise. With respect to the prior sound insulation technology, the sound insulation cover is the most easily realized and economical control mode in noise control. The sound-proof enclosure encloses the noise source within the enclosure to reduce the radiation of sound to the surroundings. The main structure of the sound insulation cover is a cover wall, which requires that the cover wall has enough sound insulation amount to prevent the propagation of sound waves, and the higher the density of the cover wall, the better the sound insulation effect is, according to the law of mass action, the cover wall is mostly made of heavy materials such as brick blocks, concrete, marble, gypsum board, steel materials and the like. In actual engineering, the sound insulation device and the sound source equipment are required to be overhauled and maintained regularly, and the sound insulation cover is required to be light and convenient and is convenient to assemble, disassemble and transport, but the structure of the existing sound insulation cover is too heavy and cannot meet the requirements.
The existing sound insulation technology can naturally attenuate the vibration and the radiated noise transmitted to the structural body to a certain extent, but the noise generated when many pressurizing devices run at present is extremely large, and the existing sound insulation cover has small sound insulation quantity and can not meet the requirements far. The Chinese patent (issued publication No. CN 203583695U) provides a module assembled sound-proof cover, which consists of a frame structure and a composite board module, wherein the frame structure consists of a bearing steel structure and a mounting groove structure, and the composite board module has uniform appearance specifications and comprises a composite sound-absorbing and insulating module, a sound-proof door module and other forms.
Disclosure of Invention
The invention aims to provide the generalized phonon crystal sound insulation cover which is simple in structure, convenient to assemble and disassemble and large in sound insulation amount.
The purpose of the invention is realized in the following way: the generalized phonon crystal column shell comprises a generalized phonon crystal column shell and a generalized phonon crystal semispherical shell connected with the generalized phonon crystal column shell, wherein a circular ring-shaped boss is arranged at the bottom end of the generalized phonon crystal column shell, a threaded hole is formed in the circular ring-shaped boss along the circumferential direction, the circular ring-shaped boss is connected with a base, at least two periodic components are arranged on the generalized phonon crystal column shell and the generalized phonon crystal semispherical shell from inside to outside, each periodic component is sequentially a nonmetallic layer and a metallic layer from inside to outside, the nonmetallic layer and the metallic layer are mutually attached, and each periodic component is mutually attached.
The invention also includes such structural features:
1. the three-period component is characterized in that the generalized phonon crystal column shell and the generalized phonon crystal hemispherical shell are sequentially provided with a first nonmetal layer, a first metal layer, a second nonmetal layer, a second metal layer, a third nonmetal layer and a third metal layer from inside to outside, and all the layers are mutually attached.
2. And sound absorption materials are uniformly coated on the inner surfaces of the generalized phonon crystal column shell and the generalized phonon crystal hemispherical shell.
3. The generalized phonon crystal column shell and the generalized phonon crystal hemispherical shell are integrated.
Compared with the prior art, the invention has the beneficial effects that: the invention introduces the generalized phonon crystal column shell and the generalized phonon crystal semispherical shell, combines the two into the sound-proof cover, utilizes the sound band gap generated by the sound-proof cover to inhibit the propagation of sound waves in the crystal cover, and can change the band gap position, the band gap width and the sound-proof amount by adjusting the structural parameters of the generalized phonon crystal column shell and the generalized phonon crystal semispherical shell and the material parameters and the quantity of the periodic components. The invention has the advantages of substantial difference with the existing sound insulation technology, large sound insulation quantity, convenient assembly and disassembly, low design and manufacturing cost and the like, and has good vibration reduction and noise reduction effects on vibration in the band gap range. The invention has simple integral structure, convenient disassembly and assembly, reliable use and lower requirement on working environment.
Drawings
FIG. 1 is a schematic diagram of the structure of the invention with the generalized phononic crystal hemispherical shell facing upwards;
FIG. 2 is a schematic diagram of the structure of the generalized phononic crystal hemispherical shell of the present invention facing downward;
fig. 3 is a schematic structural diagram of a generalized photonic crystal column shell and hemispherical shell combination having three periodic components.
Detailed Description
The invention is described in further detail below with reference to the drawings and the detailed description.
The invention mainly aims at the sound insulation of a medium-high frequency domain sound source, and the principle is that two coaxial cylindrical shells made of different materials and concentric hemispherical shells are periodically arranged along the radial directions of the cylindrical shells and the spherical shells to respectively form a generalized phonon crystal cylindrical shell structure and a hemispherical shell structure. The invention realizes the purpose of greatly reducing vibration and noise in the band gap frequency range, and can effectively inhibit the influence of external vibration on equipment in the cover body to play a role of the cover.
Embodiment case one: referring to fig. 1, 2 and 3, the invention comprises a generalized photonic crystal column shell 1 and a generalized photonic crystal hemispherical shell 2 connected with the generalized photonic crystal column shell 1, wherein a circular boss 10 is arranged at the bottom end of the generalized photonic crystal column shell 1, a threaded hole 11 is arranged along the circumferential direction of the circular boss 10, the circular boss 10 is connected with a base, namely, the invention is connected with the base through a bolt connection mode, or can be connected with a frame or a foundation, the generalized photonic crystal column shell and the generalized photonic crystal hemispherical shell are provided with at least two periodic components from inside to outside, each periodic component is sequentially a non-metal layer and a metal layer from inside to outside, the non-metal layer and the metal layer are mutually attached, and each periodic component is mutually attached, namely, each layer and each periodic component are connected together through expansion, adhesion or other reasonable technological methods.
Implementation case two: based on the above embodiment, referring to fig. 3, the present invention is provided with three periodic components, the generalized photonic crystal column shell and the generalized photonic crystal hemispherical shell are sequentially, from inside to outside, a first nonmetal layer 4, a first metal layer 5, a second nonmetal layer 6, a second metal layer 7, a third nonmetal layer 8 and a third metal layer 9, and the layers are mutually attached, that is, the three- layer nonmetal shells 4, 6, 8 and the three- layer metal shells 5, 7, 9 are connected together by expansion, adhesion or other reasonable technological methods to form a three-period generalized photonic crystal structure.
Implementation case three: based on the above embodiment, referring to fig. 3, the inner surfaces of the broad-sense photonic crystal column shell and the broad-sense photonic crystal hemispherical shell of the present invention are uniformly coated with the sound absorbing material 3, and the sound insulating performance of the sound insulating cover of the present invention can be further improved by the uniformly coated sound absorbing material 3.
Implementation case four: based on the above embodiment, the generalized photonic crystal column shell and the generalized photonic crystal hemispherical shell are integrated in consideration of the convenience of structural processing and assembly, that is, the generalized photonic crystal column shell 1 and the generalized photonic crystal hemispherical shell 2 are processed as a whole.
The invention should consider the following factors in practical use:
1. material of the periodic component. The generalized phonon crystal column shell and the generalized phonon crystal semispherical shell are composed of periodic components according to different working environments, and the constituent materials of the periodic components can be selected in various ways, for example, a nonmetallic layer can be made of nylon, reinforced nylon, polymer composite materials and the like, and a metallic layer can be made of steel, aluminum, various alloys and the like.
2. Number and size of periodic components. The number and size of the periodic components can be adjusted according to the requirements of geometric dimension, frequency band range and the like so as to adapt to different requirements.
3. And the sound insulation cover is connected with the base. The stronger structural sound is transmitted into the sound insulation cover to be used as a sound radiation source, so that the sound insulation effect is greatly reduced, and the sound insulation amount is reduced. In order to avoid or reduce the vibration of the engine base from being transmitted to the sound insulation cover, the vibration isolator is arranged at the joint of the sound insulation cover and the base, and the necessary joint of the sound insulation cover and the equipment (base) is elastically and flexibly connected as much as possible.
4. The perforated plate or the steel wire mesh is arranged on the innermost layer of the sound insulation cover so as to prevent the sound absorption material from falling off, and in addition, the perforated plate can absorb part of sound energy.
It should be noted that the above-mentioned embodiments are only for illustrating the present invention and are not limiting, and the present invention is not limited to the above-mentioned examples. All technical solutions and modifications thereof that do not depart from the spirit and scope of the present invention are intended to be included in the scope of the appended claims.
Claims (5)
1. A generalized phonon crystal sound insulation cover is characterized in that: the generalized phonon crystal column shell and the generalized phonon crystal semispherical shell are sequentially arranged from inside to outside, each cycle component is a nonmetallic layer and a metal layer, the nonmetallic layer and the metal layer are mutually attached, each cycle component is mutually attached, and a perforated plate or a steel wire mesh is arranged on the innermost layer of the generalized phonon crystal column shell and the generalized phonon crystal semispherical shell.
2. A generalized photonic crystal acoustical enclosure according to claim 1, characterized in that: the three-period component is characterized in that the generalized phonon crystal column shell and the generalized phonon crystal hemispherical shell are sequentially provided with a first nonmetal layer, a first metal layer, a second nonmetal layer, a second metal layer, a third nonmetal layer and a third metal layer from inside to outside, and all the layers are mutually attached.
3. A generalized photonic crystal acoustical shell according to claim 1 or 2, characterized in that: and sound absorption materials are uniformly coated on the inner surfaces of the generalized phonon crystal column shell and the generalized phonon crystal hemispherical shell.
4. A generalized photonic crystal acoustical shell according to claim 1 or 2, characterized in that: the generalized phonon crystal column shell and the generalized phonon crystal hemispherical shell are integrated.
5. A generalized photonic crystal acoustical enclosure according to claim 3, characterized in that: the generalized phonon crystal column shell and the generalized phonon crystal hemispherical shell are integrated.
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| CN201410827052.6A CN104538019B (en) | 2014-12-25 | 2014-12-25 | Generalized phonon crystal sound insulation cover |
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| CN104538019B true CN104538019B (en) | 2023-05-05 |
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| CN104538022B (en) * | 2014-12-25 | 2017-08-04 | 哈尔滨工程大学 | A kind of acoustic hood based on broad sense phonon crystal attached column shell acoustic band gap characteristic |
| CN105369490A (en) * | 2015-12-11 | 2016-03-02 | 杰克缝纫机股份有限公司 | Sound-attenuation dustproof cover for air suction device of sewing machine |
| CN105369489B (en) * | 2015-12-11 | 2019-01-11 | 杰克缝纫机股份有限公司 | Sewing machine air intake device |
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| CN101335574B (en) * | 2008-07-30 | 2012-09-26 | 哈尔滨工程大学 | Sound shielding method for multipath channel |
| CN102878235B (en) * | 2012-09-21 | 2014-06-11 | 哈尔滨工程大学 | Compound phonon crystal rod with multi-dimensional vibration absorbing function |
| WO2014163729A2 (en) * | 2013-03-21 | 2014-10-09 | Marathe Radhika | Acoustic bandgap structures for integration of mems resonators |
| CN103514873B (en) * | 2013-09-13 | 2015-12-09 | 西安交通大学 | A kind of low frequency vibration isolation composite sandwich structural |
| CN204360775U (en) * | 2014-12-25 | 2015-05-27 | 哈尔滨工程大学 | A kind of broad sense phonon crystal acoustic hood |
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