CN106057190B - A method of calculating noise reduction microperforated panel parameter - Google Patents
A method of calculating noise reduction microperforated panel parameter Download PDFInfo
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- CN106057190B CN106057190B CN201610360506.2A CN201610360506A CN106057190B CN 106057190 B CN106057190 B CN 106057190B CN 201610360506 A CN201610360506 A CN 201610360506A CN 106057190 B CN106057190 B CN 106057190B
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- microperforated panel
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/172—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using resonance effects
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- Acoustics & Sound (AREA)
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- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
The invention belongs to noise control field, specifically a kind of method for calculating noise reduction microperforated panel parameter.The main flow of the method for the present invention is as follows: setting the thickness of microperforated paneltCavity depth after value, plateDValue determines that the frequency range for being eliminated noise, the centre frequency of the frequency range are set asf 0, determine that centre frequency is according to demandf 0The acoustic absorptivity at place, calculate opposite acoustic resistancerWith opposite acoustic massm, calculate the aperture of aperture on microperforated paneldAnd punching rateP, obtain all design parameters of microperforated panel.The present invention has the advantages that not depend on that each parameter designing of design experiences, microperforated panel is more acurrate, microperforated panel sound absorption amplitude is big.
Description
Technical field
The invention belongs to noise control field, specifically a kind of method for calculating noise reduction microperforated panel parameter.
Background technique
Aperture and plate thickness are less than 1mm, and there are microperforated panel of the punching rate between 0.5% to 5% all resonance than other to inhale
The broader sound absorption frequency range of sound device.Therefore, microperforated panel soundabsorbing construction is just more and more used in engineering.Microperforated panel
Erasure effect mainly the cavity depth D after by plate, micropore aperture d, the plate thickness t of microperforated panel and the perforation of microperforated panel
The influence of the parameters such as rate P.Traditional microperforated panel Parameters design is more complex, and design effect very relies on setting for designer
Meter experience.
Summary of the invention
The purpose of the present invention is to overcome the above shortcomings and to provide a kind of methods for calculating noise reduction microperforated panel parameter, can obtain
The microperforated panel parameter that noise main band sound absorption effect must be made to optimize.
To realize the above-mentioned technical purpose, scheme provided by the invention is: a method of noise reduction microperforated panel parameter is calculated,
Include the following steps.
Step 1 sets the thickness of microperforated paneltCavity depth after value, plateDValue.
Step 2 finds out the frequency band where noise main energetic, by the centre frequency of frequency bandf 0It is determined as microperforated panel
Resonant frequency determines that centre frequency is according to demandf 0The acoustic absorptivity at place。
Step 3, willSubstitution formula (1) acquires opposite acoustic resistance r；It willD、f 0In substitution formula (2), opposite acoustic mass is found outm。
Step 4 is rightValue judged, whenValue is in section (4.39 f 0,] it is interior when, with formula (3) calculate
Apertured；WhenValue is in section [2.79 f 0, 4.39 f 0] it is interior when, with formula (4) calculated hole diametersd。
Step 5, willt、f 0、r、dValue substitute into formula (5) in, calculate punching rateP。
Formula used in above-mentioned steps is as follows:
(1)
(2)
(3)
(4)
(5)
In formula,cFor THE VELOCITY OF SOUND IN AIR, unit m/s；DFor chamber depth, i.e. microperforated panel is at a distance from rear wall, unit m；m
For opposite acoustic mass；rFor opposite acoustic resistance；dFor micropunch diameter, unit mm；tFor plate thickness of perforating, unit mm；PTo wear
Porosity, unit %.
Moreover, settingtValue is less than 1mm；According to real space condition, cavity depth after plate as big as possible is setDValue；According to
Demand determines that centre frequency isf 0The acoustic absorptivity at placeWhen, generally take 0.9~0.95.
The beneficial effects of the present invention are: design experiences are not depended in design process, design process is easy；It is taken most when design
Big cavity depth, sound sucting band is wider, and sound absorption effect is good；By stages calculates microperforated panel parameter, and the parameter designed is more quasi-
Really.
Detailed description of the invention
Fig. 1 is flow chart of the method for the present invention.
Specific embodiment
Below in conjunction with the accompanying drawings and embodiment the invention will be further described.
The present embodiment provides a kind of methods for calculating noise reduction microperforated panel parameter, as shown in Figure 1, including the following steps.
Step 1 sets the thickness of microperforated paneltValue, it is desirable thattValue is less than 1mm；According to real space condition, setting is as far as possible
Cavity depth after big plateDValue；Determine that the frequency range for being eliminated noise, the centre frequency of the frequency range are set asf 0, determine according to demand
Centre frequency isf 0The acoustic absorptivity at place, generally take 0.9~0.95.
Step 2 finds out the frequency band where noise main energetic, by the centre frequency of frequency bandf 0It is determined as microperforated panel
Resonant frequency.
Step 3, willSubstitution formula (1) acquires opposite acoustic resistance r；It willD、f 0In substitution formula (2), opposite acoustic mass is found outm,
(1)
(2)。
Step 4 is rightValue judged,
WhenValue is in section (4.39 f 0,] it is interior when, with formula (3) calculated hole diametersd,
(3)
WhenValue is in section [2.79 f 0, 4.39 f 0] it is interior when, with formula (4) calculated hole diametersD,
(4)
Step 5, willt、f 0、r、dValue substitute into formula (5) in, calculate punching rateP,
(5)。
In above-mentioned formula,cFor THE VELOCITY OF SOUND IN AIR, unit m/s；DFor chamber depth, i.e. microperforated panel is at a distance from rear wall, unit
For m；mFor opposite acoustic mass；rFor opposite acoustic resistance；dFor micropunch diameter, unit mm；tFor plate thickness of perforating, unit mm；P
For punching rate, unit %.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the principle of the present invention, several improvement or deformation can also be made, these are improved or deformation is also answered
It is considered as protection scope of the present invention.
Claims (2)
1. a kind of method for calculating noise reduction microperforated panel parameter, includes the following steps:
Step 1 sets cavity depth D value after the thickness t value of microperforated panel, plate；
Step 2 finds out the frequency band where noise main energetic, by the centre frequency f of frequency band0It is determined as the resonance frequency of microperforated panel
Rate determines that centre frequency is f according to demand0The acoustic absorptivity α at place0；
Step 3, by α0Substitution formula (1) acquires opposite acoustic resistance r；By D, f0In substitution formula (2), opposite acoustic mass m is found out；
Step 4 judges r/m value, when r/m value is in section (4.39f0,+∞] it is interior when, with formula (3) calculated hole diameters d；Work as r/
M value is in section [2.79f0, 4.39f0] it is interior when, with formula (4) calculated hole diameters d；
Step 5, by t, f0, r, d value substitute into formula (5) in, calculate punching rate P；
Formula used in above-mentioned steps is as follows:
In formula, c is THE VELOCITY OF SOUND IN AIR, unit m/s；D is that chamber is deep, i.e. microperforated panel is at a distance from rear wall, unit m；M is phase
To acoustic mass；R is opposite acoustic resistance；α0It is f for center frequency0The acoustic absorptivity at place；D is micropunch diameter, unit mm；T is to wear
Hole plate thickness, unit mm；P is punching rate, unit %.
2. a kind of method for calculating noise reduction microperforated panel parameter according to claim 1, it is characterised in that: t value is less than
1mm, α0Take 0.9~0.95.
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| CN201610360506.2A CN106057190B (en) | 2016-05-28 | 2016-05-28 | A method of calculating noise reduction microperforated panel parameter |
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| CN201610360506.2A CN106057190B (en) | 2016-05-28 | 2016-05-28 | A method of calculating noise reduction microperforated panel parameter |
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| CN106057190A CN106057190A (en) | 2016-10-26 |
| CN106057190B true CN106057190B (en) | 2019-09-06 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108151283A (en) | 2017-12-04 | 2018-06-12 | 北京小米移动软件有限公司 | Prepare method, silencing means and the air purifier of silencing means |
| CN111611651B (en) * | 2020-05-22 | 2022-08-19 | 中国航空工业集团公司西安飞机设计研究所 | Design method of turbofan engine nacelle sound absorption structure |
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| EP1701016A1 (en) * | 2005-02-03 | 2006-09-13 | United Technologies Corporation | Acoustic liner with nonuniform impedance |
| EP1860301A3 (en) * | 2006-05-26 | 2009-11-04 | United Technologies Corporation | Micro-perforated acoustic liner |
| CN201796596U (en) * | 2010-06-03 | 2011-04-13 | 西北工业大学 | Micropunch plate with fibers penetrating into micropores |
| CN102063896A (en) * | 2010-10-15 | 2011-05-18 | 南京航空航天大学 | Parameter design method of resonance sound absorption structure of engineering-oriented microperforated panel |
| CN102543061A (en) * | 2012-01-20 | 2012-07-04 | 江苏大学 | Wide band sound absorption structure of film mechanical impedance combined with micropunched plate acoustic impedance |
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2016
- 2016-05-28 CN CN201610360506.2A patent/CN106057190B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1701016A1 (en) * | 2005-02-03 | 2006-09-13 | United Technologies Corporation | Acoustic liner with nonuniform impedance |
| EP1860301A3 (en) * | 2006-05-26 | 2009-11-04 | United Technologies Corporation | Micro-perforated acoustic liner |
| CN201796596U (en) * | 2010-06-03 | 2011-04-13 | 西北工业大学 | Micropunch plate with fibers penetrating into micropores |
| CN102063896A (en) * | 2010-10-15 | 2011-05-18 | 南京航空航天大学 | Parameter design method of resonance sound absorption structure of engineering-oriented microperforated panel |
| CN102543061A (en) * | 2012-01-20 | 2012-07-04 | 江苏大学 | Wide band sound absorption structure of film mechanical impedance combined with micropunched plate acoustic impedance |
Non-Patent Citations (1)
| Title |
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| "微穿孔板吸声结构仿真计算方法研究";杜韬 等;《工程热物理学报》;20150630;第1242-1246页 |
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