CN111102423A - Compound type silencing barrel based on photonic crystal pipeline - Google Patents
Compound type silencing barrel based on photonic crystal pipeline Download PDFInfo
- Publication number
- CN111102423A CN111102423A CN201911292001.7A CN201911292001A CN111102423A CN 111102423 A CN111102423 A CN 111102423A CN 201911292001 A CN201911292001 A CN 201911292001A CN 111102423 A CN111102423 A CN 111102423A
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- cylinder
- annular
- perforated
- phononic crystal
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/02—Energy absorbers; Noise absorbers
- F16L55/033—Noise absorbers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/02—Energy absorbers; Noise absorbers
- F16L55/033—Noise absorbers
- F16L55/0336—Noise absorbers by means of sound-absorbing materials
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/02—Energy absorbers; Noise absorbers
- F16L55/033—Noise absorbers
- F16L55/0338—Noise absorbers by means of a membrane
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
The invention discloses a composite type silencing cylinder based on a photonic crystal pipeline, which consists of a perforated resistive silencing cylinder and a photonic crystal silencing cylinder which are sequentially and alternately arranged, wherein the perforated resistive silencing cylinder is provided with a micro-perforated plate and a sound absorption material layer, and the photonic crystal silencing cylinder is provided with photonic crystal cellular units which are distributed on a second annular framework in an annular array. The silencing cylinder is an insertion type silencing cylinder, the silencing cylinder is inserted into a ship air conditioner ventilating pipeline, and when airflow passes through the perforated resistance silencing cylinder, the micro-perforated plate and the sound absorption material layer mainly reduce the noise of medium and high frequency noise; when the material passes through the phononic crystal silencing cylinder, local resonance is generated under the action of an internal structure, energy is consumed to achieve the purpose of noise reduction, and the main action frequency is low frequency. The invention has simple structure, small occupied space and easy operation.
Description
Technical Field
The invention relates to the technical field of marine air conditioner ventilating duct silencing, in particular to a composite silencing barrel based on a phonon crystal pipeline.
Background
The ship air conditioning and ventilating system is used for creating a good air environment in a cabin, ensuring that the temperature and the humidity of air in the cabin fluctuate within a certain range and providing high-quality air so as to meet the requirements of comfort and physical health of crews. However, the arrangement of the air conditioning ventilation system can not avoid noise, and the noise is mainly generated when air processing equipment, a centrifugal fan, an air distributor and other equipment, an air pipe and a valve in the system pass through the air in the air conditioning ventilation system during operation, and the noise affects the daily life and work of crews and can generate physiological and psychological influences and harm to human bodies, so that noise reduction treatment must be performed on the ventilation pipeline.
An important feature of a phononic crystal is that it has an acoustic band gap, i.e. a phononic crystal is a functional material or structure composed of two or more elastic media with periodic structure and elastic band gap characteristics. When the sound wave is transmitted in the phononic crystal, a special band gap is formed under the action of an internal periodic structure. The sound wave ship in the band gap frequency range is restrained, so that the phononic crystal has wide application prospect in the noise reduction aspect.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a composite type silencing barrel based on a phononic crystal pipeline, which solves the problem of noise in a ship air-conditioning ventilation pipeline.
The technical scheme is as follows: the invention relates to a composite type silencing cylinder based on a photonic crystal pipeline, which consists of a perforated resistive silencing cylinder and a photonic crystal silencing cylinder which are alternately arranged in sequence, wherein the perforated resistive silencing cylinder and the photonic crystal silencing cylinder are fixedly and hermetically connected, so that the composite type silencing cylinder is formed;
the perforated resistive muffling cylinder comprises a first annular framework, a sound absorbing material layer and a micro-perforated plate which are arranged from outside to inside and in a concentric mode, the first annular framework is in a grid shape, the sound absorbing material layer covers the inner side of the first framework, the micro-perforated plate and the inner side of the sound absorbing material layer are connected in an adhering mode, and a plurality of through holes distributed in an annular array mode are formed in the micro-perforated plate; the phononic crystal silencing cylinder comprises a second annular framework in a grid shape, each grid of the second annular framework is provided with a phononic crystal cell unit, the phononic crystal cell units are distributed in an annular array, each phononic crystal cell unit comprises an elastic film and a mass block, the elastic film is tensioned and fixedly adhered to a grid frame of the second annular framework by applying prestress, and the mass block is adhered to the center of the outer side of the tensioned elastic film;
the channel of the perforated resistive muffler cylinder and the channel of the phononic crystal muffler cylinder form a muffling channel of the composite muffler cylinder.
Furthermore, the thickness of the micro-perforated plate is 0.5-1 mm, the perforation rate is 1-5%, and the aperture of the through hole of the micro-perforated plate is 0.6-1 mm. The microperforated panel is used for controlling the frequency spectrum performance of the muffling cylinder by selecting different perforation rates and hole depths with different plate thicknesses, so that the microperforated panel can obtain good muffling effect in a required frequency range.
Furthermore, the sound absorption material of the sound absorption material layer is sound absorption cotton, and the thickness of the sound absorption material layer is 10-15 mm.
Furthermore, the elastic film is a silica gel film, and the thickness of the elastic film is 0.1-0.3 mm. The silica gel film is adhered to the grid frame of the second annular framework and is tensioned and stretched to a certain degree, so that the silica gel film has certain prestress, and the silica gel film and the mass block generate strong interaction when being excited by sound pressure due to large rigidity difference between the silica gel film and the mass block, and energy is consumed.
Furthermore, the mass block is circular, the radius of the mass block is 5-7 mm, the thickness of the mass block is 1-2 mm, and the mass block is made of common steel.
Further, first annular skeleton and second annular skeleton are the cylinder structure, and first annular skeleton and second annular skeleton all include multiunit longitudinal tie muscle and multiunit annular tie muscle, longitudinal tie muscle distributes along the axis direction of combined type noise elimination section of thick bamboo, the circumference of combined type noise elimination section of thick bamboo is distributed along to the annular tie muscle, longitudinal tie muscle and annular tie muscle mutually perpendicular intersect and form the annular skeleton structure that is latticed jointly, and the crosspoint of longitudinal tie muscle and annular tie muscle adopts welded fastening.
Further, the length of the micro-perforated plate is the same as that of the perforated resistive muffler.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
1. noise in the ventilation pipeline can be reduced by 10-15 dB in a wide frequency band of 10-5000 Hz through the comprehensive action of the micro-perforated plate, the sound absorption material layer and the phononic crystal cellular units;
2. the invention can widen the noise reduction frequency range by changing the size of the mass block in the phononic crystal noise reduction cylinder;
3. the perforated resistive muffler and the phononic crystal muffler are alternately combined together, so that the pipeline noise can be more fully reduced;
4. the silencing barrel is inserted into the pipeline, so that the purpose of noise reduction can be realized by inserting the silencing barrel into the pipeline, and the installation is convenient.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic diagram of a phononic crystal cell unit according to the present invention.
Detailed Description
The invention is further described below with reference to the following figures and examples:
as shown in fig. 1 and fig. 2, the composite muffling cylinder based on the photonic crystal pipeline of the present invention is composed of a perforated resistive muffling cylinder 1 and a photonic crystal muffling cylinder 2 which are alternately arranged in sequence, wherein the perforated resistive muffling cylinder 1 and the photonic crystal muffling cylinder 2 are fixedly and hermetically connected to form the composite muffling cylinder, so as to more fully reduce the noise of the ventilation pipeline; the channel 11 of the perforated resistive muffling cylinder 1 and the channel (not shown) of the photonic crystal muffling cylinder 2 form a muffling channel of the composite muffling cylinder, and the number of the perforated resistive muffling cylinder 1 and the number of the photonic crystal muffling cylinders 2 can be changed according to the noise reduction requirement, so that a better muffling effect is achieved;
the perforated resistive muffling cylinder 1 comprises a first annular framework 12, a sound absorbing material layer 13 and a micro-perforated plate 14 which are arranged from outside to inside and in a concentric mode, the first annular framework 12 is in a grid shape, the sound absorbing material layer 13 covers the inner side of the first framework 12, the sound absorbing material of the sound absorbing material layer 13 is sound absorbing cotton, the thickness of the sound absorbing material layer 13 is 10-15 mm, the micro-perforated plate 14 and the inner side of the sound absorbing material layer 13 are connected in an adhesive mode, a plurality of through holes 141 distributed in an annular array mode are formed in the micro-perforated plate 14, the thickness of the micro-perforated plate 14 is 0.5-1 mm, the perforation rate of the micro-perforated plate is 1-5%, the aperture of each through hole 141 of the micro-perforated plate 14 is 0.6-1 mm, and the; the micro-perforated plate 14 is used for controlling the frequency spectrum performance of the silencing cylinder by selecting different perforation rates and hole depths with different plate thicknesses, so that a good silencing effect is obtained in a required frequency range;
the phononic crystal silencing barrel 2 comprises a second annular framework 21 in a grid shape, each grid of the second annular framework 21 is provided with a phononic crystal cell unit 22, the phononic crystal cell units 22 are distributed in an annular array, each phononic crystal cell unit 22 comprises an elastic film 221 and a mass block 222, the elastic film 221 is tensioned and fixedly adhered to a grid frame of the second annular framework 21 by applying prestress, and the mass block 222 is adhered to the outer center of the tensioned elastic film 221; the elastic film 221 is a silica gel film, the thickness of the elastic film is 0.1-0.3 mm, the mass block 222 is circular, the radius of the mass block is 5-7 mm, the thickness of the mass block is 1-2 mm, the material is common steel, and the noise reduction frequency range can be widened by changing the size of the mass block 222 in the photonic crystal noise elimination cylinder; the silica gel film is adhered to the grid frame of the second annular framework 21 and is tensioned and stretched to a certain degree, so that the silica gel film has certain prestress, and the silica gel film and the mass block 222 generate strong interaction when being excited by sound pressure due to large rigidity difference between the silica gel film and the mass block, so that energy is consumed, and the noise reduction effect is achieved;
when 2 perforated resistive muffling cylinders 1 and 2 photonic crystal muffling cylinders are arranged, noise in the ventilation pipeline can be reduced by 10-15 dB in a wide frequency band of 10-5000 Hz through the comprehensive action of the micro-perforated plates 14 of the perforated resistive muffling cylinders 1, the sound absorbing material layer 13 and the photonic crystal cellular units 22; if the number of the perforated resistive muffling cylinders 1 and the number of the photonic crystal muffling cylinders 2 are properly increased, the noise of the ventilation pipeline can be reduced lower, and the size of the mass block 222 in the multiple groups of photonic crystal muffling cylinders 2 is changed, so that the effect of widening the noise reduction frequency range can be achieved;
the first annular framework 12 and the second annular framework 21 are both in a cylindrical structure, the first annular framework 12 and the second annular framework 21 both comprise a plurality of groups of longitudinal connecting ribs 4 and a plurality of groups of annular connecting ribs 3, the longitudinal connecting ribs 4 are distributed along the axial direction of the composite muffling cylinder, the annular connecting ribs 3 are distributed along the circumferential direction of the composite muffling cylinder, the longitudinal connecting ribs 4 and the annular connecting ribs 3 are mutually perpendicularly crossed to form a latticed annular framework structure, and the cross points of the longitudinal connecting ribs 4 and the annular connecting ribs 3 are fixed by welding;
the purpose of noise reduction can be realized by directly inserting the composite muffling barrel into the ventilating duct of the ship air conditioner, and the installation is convenient; when the air flow passes through the perforated resistive noise elimination cylinder 1, the micro-perforated plate 14 and the sound absorption material layer 13 mainly reduce the noise of the middle and high frequency noise; when passing through the phononic crystal silencing cylinder 2, the partial resonance is generated under the action of the elastic film 221 and the mass block 222, the energy is consumed to achieve the purpose of noise reduction, and the main action frequency is low frequency.
Claims (7)
1. The utility model provides a compound muffler section of thick bamboo based on phonon crystal pipeline which characterized in that: the muffling cylinder consists of a perforated resistive muffling cylinder and a photonic crystal muffling cylinder which are alternately arranged in sequence, wherein the perforated resistive muffling cylinder and the photonic crystal muffling cylinder are fixedly and hermetically connected, so that a composite muffling cylinder is formed;
the perforated resistive muffling cylinder comprises a first annular framework, a sound absorbing material layer and a micro-perforated plate which are arranged from outside to inside and in a concentric mode, the first annular framework is in a grid shape, the sound absorbing material layer covers the inner side of the first framework, the micro-perforated plate and the inner side of the sound absorbing material layer are connected in an adhering mode, and a plurality of through holes distributed in an annular array mode are formed in the micro-perforated plate; the phononic crystal silencing cylinder comprises a second annular framework in a grid shape, each grid of the second annular framework is provided with a phononic crystal cell unit, the phononic crystal cell units are distributed in an annular array, each phononic crystal cell unit comprises an elastic film and a mass block, the elastic film is tensioned and fixedly adhered to a grid frame of the second annular framework by applying prestress, and the mass block is adhered to the center of the outer side of the tensioned elastic film;
the channel of the perforated resistive muffler cylinder and the channel of the phononic crystal muffler cylinder form a muffling channel of the composite muffler cylinder.
2. The compound type silencing pot based on the phononic crystal pipeline as set forth in claim 1, characterized in that: the thickness of the micro-perforated plate is 0.5-1 mm, the perforation rate is 1-5%, and the aperture of the through hole of the micro-perforated plate is 0.6-1 mm.
3. The compound type silencing pot based on the phononic crystal pipeline as set forth in claim 1, characterized in that: the sound absorption material of sound absorption material layer is the sound absorption cotton, and the thickness of sound absorption material layer is 10 ~ 15 mm.
4. The compound type silencing pot based on the phononic crystal pipeline as set forth in claim 1, characterized in that: the elastic film is a silica gel film, and the thickness of the elastic film is 0.1-0.3 mm.
5. The compound type silencing pot based on the phononic crystal pipeline as set forth in claim 1, characterized in that: the mass block is circular, the radius of the mass block is 5-7 mm, the thickness of the mass block is 1-2 mm, and the mass block is made of common steel.
6. The composite type silencing pot based on the phononic crystal pipeline as set forth in any one of claims 1 to 5, wherein: first annular skeleton and second annular skeleton are the cylinder structure, and first annular skeleton and second annular skeleton all include multiunit longitudinal tie muscle and multiunit annular tie muscle, the longitudinal tie muscle distributes along the axis direction of combined type noise elimination section of thick bamboo, the annular tie muscle distributes along the circumference of combined type noise elimination section of thick bamboo, longitudinal tie muscle and annular tie muscle mutually perpendicular intersect and form jointly and be latticed annular skeleton texture, and the crosspoint of longitudinal tie muscle and annular tie muscle adopts welded fastening.
7. The compound type silencing pot based on the phononic crystal pipeline as set forth in claim 1, characterized in that: the length of the micro-perforated plate is the same as that of the perforated resistive silencing cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911292001.7A CN111102423A (en) | 2019-12-16 | 2019-12-16 | Compound type silencing barrel based on photonic crystal pipeline |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911292001.7A CN111102423A (en) | 2019-12-16 | 2019-12-16 | Compound type silencing barrel based on photonic crystal pipeline |
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| CN111102423A true CN111102423A (en) | 2020-05-05 |
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| CN201911292001.7A Pending CN111102423A (en) | 2019-12-16 | 2019-12-16 | Compound type silencing barrel based on photonic crystal pipeline |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113090847A (en) * | 2021-04-21 | 2021-07-09 | 中国人民解放军国防科技大学 | Fluid-solid coupling mechanical metamaterial pipeline structure for vibration reduction and noise elimination and preparation method thereof |
| CN113968308A (en) * | 2021-12-08 | 2022-01-25 | 中国船舶科学研究中心 | Low-noise strut structure of small waterplane area catamaran |
| CN114049868A (en) * | 2021-11-10 | 2022-02-15 | 哈尔滨工程大学船舶装备科技有限公司 | Composite sound insulation board based on phononic crystal and manufacturing method thereof |
| CN115331651A (en) * | 2022-08-09 | 2022-11-11 | 四川大学 | Low-frequency vibration-damping sound-absorbing integrated phononic crystal composite noise reduction structure and design method |
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| CN115331651A (en) * | 2022-08-09 | 2022-11-11 | 四川大学 | Low-frequency vibration-damping sound-absorbing integrated phononic crystal composite noise reduction structure and design method |
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Application publication date: 20200505 |