CN201011616Y - Perforated plate for improving acoustic absorption property - Google Patents
Perforated plate for improving acoustic absorption property Download PDFInfo
- Publication number
- CN201011616Y CN201011616Y CNU2006201075735U CN200620107573U CN201011616Y CN 201011616 Y CN201011616 Y CN 201011616Y CN U2006201075735 U CNU2006201075735 U CN U2006201075735U CN 200620107573 U CN200620107573 U CN 200620107573U CN 201011616 Y CN201011616 Y CN 201011616Y
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- perforated plate
- holes
- hole
- sound absorbing
- micro
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- 238000010521 absorption reaction Methods 0.000 title description 9
- 239000002994 raw material Substances 0.000 abstract description 2
- 239000002184 metal Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 6
- 239000011148 porous material Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000002745 absorbent Effects 0.000 description 2
- 239000002250 absorbent Substances 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
Abstract
The utility model is a perforated plate which can improve the sound absorbing capability, comprising a perforated plate. The perforated plate is provided with column holes or micro-column holes with burr arranged on the tail ends. The perforated plate is provided with cone holes or micro-round holes. The perforated plate is provided with reverse cone holes or reverse micro-round holes. With the burr arranged on the tail ends of the column holes or micro-column holes, the resonance and sound absorbing peak of the perforated plate moves towards to the low frequency, thereby increasing the sound absorbing factor of the low-frequency stage and greatly saving the raw material consumption. The round hole structure of the perforated plate also increases the average sound absorbing factor of the perforated plate.
Description
Technical field
The utility model relates to the perforated plate in a kind of resonance sound-absorbing chamber.
Background technology
Resonance sound-absorbing structure is the sound absorber that utilizes the resonance sound-absorbing principle design, under acoustic wave excitation, the structure of vibrating is because the interior friction of self and the friction of air, a part of vibrational energy is transformed into heat energy and consumes, according to law of conservation of energy, the energy of these losses must come the acoustic energy of their vibrations of autoexcitation.When the natural frequency of incident sound wave frequency and structure matched, structure produced resonance, and the energy loss that cause this moment is the acoustical absorption coefficient maximum of member.
Common resonance sound-absorbing structure has thin plate and film sound absorption structure, sound absorbent perforated structure (comprising microperforated absorber).For making perforation board resonance sound absorption structure have higher resonance sound-absorbing coefficient, the acoustic resistance of perforated plate structure and the characteristic impedance of atmosphere are complementary, promptly the relative specific acoustic resistance of perforated plate structure should be controlled near 1.Common perforated plate is because the hole is bigger, the linear acoustic resistance that itself is provided is very low, when incident sound pressure is not really high, even adopt microperforated panel and considered non-linear acoustic resistance, still be difficult to obtain sufficiently high specific acoustic resistance, therefore need to paste sound-absorbing porous material to replenish acoustic resistance at perforated plate back side lining.By with the compound use of sound-absorbing porous material, not only can improve its resonance sound-absorbing coefficient, simultaneously effective broadening perforation board resonance sound absorption structure sound sucting band is used widely in field of engineering technology.
The microperforated panel resonance sound-absorbing structure is compared with common sound absorbent perforated structure, its principal feature be penetration hole diameter below 1 millimeter, have low acoustic mass, high acoustic resistance, its sound sucting band width is better than conventional perforation board resonance sound absorption structure.In resonance sound-absorbing structure, also have this structure only and have wide sound sucting band, can remedy the narrow deficiency of resonance sound-absorbing structure sound sucting band, and have cleaning, pollution-free, be not subjected to advantages such as environmental restraint.Fast development along with process technology and computing method etc. makes microperforated panel soundabsorbing construction come into one's own day by day, and makes the micropunch theory obtain deep development.
Perforated plate (comprising microperforated panel) generally adopts mechanical punching technology at present, has waste material to produce in the punch process, and punching is generally the cylindrical hole of rule, and hole depth is the thickness of plate.
Summary of the invention
The purpose of this utility model provides a kind of length that increases the hole, and the shape that changes the hole is improved the perforated plate of sound absorbing capabilities.
The purpose of this utility model is achieved through the following technical solutions: comprise perforated plate, what arrange on described perforated plate is that the terminal cylindrical hole of burr of being with is or/and little cylindrical hole.
Comprise perforated plate, what arrange on described perforated plate is rounding platform hole or/and fall little round platform hole.Comprise perforated plate, what arrange on described perforated plate is that the round platform hole is or/and little round platform hole.
The utility model is owing to adopted the end band burr of perforated plate, and the height of burr promptly equals to increase the thickness of slab of perforated plate, and the resonance sound-absorbing peak of perforated plate is moved to low frequency, thereby has improved the acoustical absorption coefficient of low-frequency range.Another perforated plate adopts the round platform pore structure, has also improved the average sound absorption coefficient of perforated plate.Wherein the round platform pore structure is better than the acoustical absorption coefficient of rounding platform pore structure.These two kinds of structures are compared with increasing thickness of slab, have saved raw-material consumption greatly.
Description of drawings
Fig. 1 is the structure for amplifying schematic top plan view of a kind of perforated plate of the present utility model;
Fig. 2 is the structure for amplifying schematic top plan view of another kind of perforated plate of the present utility model;
Fig. 3 is that the structure for amplifying master that analyses and observe of the cylindrical hole perforated plate of terminal band burr of the present utility model looks synoptic diagram;
Fig. 4 is that the structure for amplifying master that analyses and observe of rounding platform of the present utility model hole perforated plate looks synoptic diagram;
Fig. 5 is that the structure for amplifying master that analyses and observe of round platform of the present utility model hole perforated plate looks synoptic diagram.
Embodiment
With reference to Fig. 1, Fig. 3, with malleable sheet metal to be bored a hole, be placed on the special metal mold of band bellmouth, with the supporting pressing mold of metal mold on be with the taper pin of projection, the bellmouth of aiming on the metal mold pushes sheet metal, generates perforated plate 1.Have the cylindrical hole 2 that squeezes out and the burr 3 of cylindrical hole 2 ends on this perforated plate 1.The length of cylindrical hole 2 equals the thickness of perforated plate 1, and the height of burr 3 equals the length that cylindrical hole 2 increases.
With reference to Fig. 4, Fig. 5 is to adopt the drill bit that bores round taper hole, directly holes on the sheet metal of intending perforation, promptly is processed to form the perforated plate 1 in round platform hole 5.Perforated plate 1 is transferred a face, and round platform hole 5 promptly becomes rounding platform hole 4.
According to the embodiment of above-mentioned Fig. 1, Fig. 3 and Fig. 4, Fig. 5, can process the microperforated panel identical with its hole shape.
With reference to Fig. 2,, on same perforated sheet metal, process cylindrical hole 2 and little cylindrical hole of terminal band burr simultaneously according to above-mentioned embodiment.On same perforated sheet metal, process round platform hole 5 and little round platform hole 6.Also promptly on same perforated sheet metal, process rounding platform hole 4 and fall little round platform hole.
Claims (3)
1. a perforated plate that improves sound absorbing capabilities comprises perforated plate (1), it is characterized in that: in the last layout of described perforated plate (1) is that the terminal cylindrical hole (2) of burr (3) of being with is or/and little cylindrical hole.
2. a perforated plate that improves sound absorbing capabilities comprises perforated plate (1), it is characterized in that: what go up to arrange at described perforated plate (1) is rounding platform hole (4) or/and fall little round platform hole.
3. a perforated plate that improves sound absorbing capabilities comprises perforated plate (1), it is characterized in that: in the last layout of described perforated plate (1) is that round platform hole (5) is or/and little round platform hole (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2006201075735U CN201011616Y (en) | 2006-09-12 | 2006-09-12 | Perforated plate for improving acoustic absorption property |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2006201075735U CN201011616Y (en) | 2006-09-12 | 2006-09-12 | Perforated plate for improving acoustic absorption property |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201011616Y true CN201011616Y (en) | 2008-01-23 |
Family
ID=39046559
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2006201075735U Expired - Fee Related CN201011616Y (en) | 2006-09-12 | 2006-09-12 | Perforated plate for improving acoustic absorption property |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201011616Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104966511A (en) * | 2015-07-30 | 2015-10-07 | 贵州大学 | Binary embedded cylinder cavity sound absorption covering layer |
| CN105006226A (en) * | 2015-07-30 | 2015-10-28 | 贵州大学 | Cylindrical cavity combination sound-absorbing coating |
| CN106251854A (en) * | 2016-06-22 | 2016-12-21 | 潘路希 | Combination perforated plate and resonance sound-absorbing structure |
| CN112530394A (en) * | 2020-11-09 | 2021-03-19 | 中国人民解放军海军工程大学 | Counter bore type micro-perforated plate applied to water medium, micro-perforated sound absorption structure and sound absorption coefficient calculation method thereof |
-
2006
- 2006-09-12 CN CNU2006201075735U patent/CN201011616Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104966511A (en) * | 2015-07-30 | 2015-10-07 | 贵州大学 | Binary embedded cylinder cavity sound absorption covering layer |
| CN105006226A (en) * | 2015-07-30 | 2015-10-28 | 贵州大学 | Cylindrical cavity combination sound-absorbing coating |
| CN106251854A (en) * | 2016-06-22 | 2016-12-21 | 潘路希 | Combination perforated plate and resonance sound-absorbing structure |
| CN112530394A (en) * | 2020-11-09 | 2021-03-19 | 中国人民解放军海军工程大学 | Counter bore type micro-perforated plate applied to water medium, micro-perforated sound absorption structure and sound absorption coefficient calculation method thereof |
| CN112530394B (en) * | 2020-11-09 | 2023-09-08 | 中国人民解放军海军工程大学 | Counter bore type microperforated panel applied to aqueous medium, microperforated sound absorption structure and sound absorption coefficient calculation method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |