CN110139190A - A method of for improving high sound intensity reverberation chamber high frequency sound pressure level - Google Patents
A method of for improving high sound intensity reverberation chamber high frequency sound pressure level Download PDFInfo
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- CN110139190A CN110139190A CN201910384396.7A CN201910384396A CN110139190A CN 110139190 A CN110139190 A CN 110139190A CN 201910384396 A CN201910384396 A CN 201910384396A CN 110139190 A CN110139190 A CN 110139190A
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000013461 design Methods 0.000 claims abstract description 12
- 238000005259 measurement Methods 0.000 claims description 10
- 238000001228 spectrum Methods 0.000 claims description 10
- 238000012938 design process Methods 0.000 claims description 2
- 240000002853 Nelumbo nucifera Species 0.000 claims 1
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- 235000006510 Nelumbo pentapetala Nutrition 0.000 claims 1
- 235000013399 edible fruits Nutrition 0.000 claims 1
- 230000003595 spectral effect Effects 0.000 description 4
- 238000012360 testing method Methods 0.000 description 2
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- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
- H04R1/2807—Enclosures comprising vibrating or resonating arrangements
- H04R1/2815—Enclosures comprising vibrating or resonating arrangements of the bass reflex type
- H04R1/2823—Vents, i.e. ports, e.g. shape thereof or tuning thereof with damping material
- H04R1/2826—Vents, i.e. ports, e.g. shape thereof or tuning thereof with damping material for loudspeaker transducers
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- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
The present invention provides a kind of methods for improving high sound intensity reverberation chamber high frequency sound pressure level, noise is generated to improve the sound pressure level of high sound intensity reverberation chamber high frequency by flowing into high pressure gas in cavity sounding device by jet pipe, controls the size that cavity sounding device generates noise by adjusting the flow of high pressure gas.This method can targetedly improve the sound pressure level of the frequency band of high sound intensity reverberation chamber high-frequency ability shortcoming, and the method can be not only used for the high sound intensity reverberation chamber capability improving used has been put into and can also be used in new reverberation chamber design.
Description
Technical field
The present invention relates to high sound intensity reverberation chamber technical fields, in particular to high sound intensity reverberation chamber sound pressure level.
Background technique
High sound intensity reverberation chamber is a kind of high sound intensity noise fest device, and reverberation chamber is the list with rigidity, sound reflecting wall
Between, uniform reverberation noise field is formed after multiple reflections in this room.Noise is usually generated by electropneumatic loudspeaker,
And reverberation chamber is injected by the horn of coupling.Currently, electropneumatic loudspeaker in the market has WAS3000, EPT-200, CR-
ENSG-500, CR-ENSG-650, wherein WAS3000, CR-ENSG-500 be low frequency electropneumatic loudspeaker, EPT-200,
CR-ENSG-650 is high-frequency electric compressed-air loudspeaker, and WAS3000, EPT-200 are external loudspeaker, is purchased in the presence of certain
Risk.In high sound intensity reverberation chamber, the high-frequency sound energy power decaying biggish reverberation chamber of especially severe, especially volume, therefore, body
The biggish high sound intensity reverberation chamber of product is easy to appear the phenomenon that high frequency is unable to satisfy test demand.Reverberation chamber high frequency sound pressure level is improved,
The measure that can be taken has: increasing high-frequency electric compressed-air loudspeaker, using the method, the excellent EPT- of higher cost, high frequency performance
There is the high sound intensity reverberation chamber purchasing risk, having come into operation and raise to increase high-frequency electric air-flow in 200 electropneumatic loudspeakers
The quantity of sound device will certainly reduce the quantity of medium/low frequency electropneumatic loudspeaker, and due to the driven airflow loudspeaking of different model
Device exports end cross-sectional area difference and processes to redesign to loudspeaker section.
Summary of the invention
The purpose of the present invention is: a kind of raising high sound intensity is provided on the basis of not increasing high-frequency electric compressed-air loudspeaker
The method of reverberation chamber sound pressure level.
The technical scheme is that
A method of for improving high sound intensity reverberation chamber high frequency sound pressure level, include the following steps:
1) high pressure gas is introduced into high sound intensity reverberation chamber；
2) cavity sounding device is designed using cavity noise principle；
3) jet pipe is designed using Wei Duoxinsi base curves formula；
4) it flows into high pressure gas in cavity sounding device by jet pipe and generates noise to improve high sound intensity reverberation chamber height
The sound pressure level of frequency controls the size that cavity sounding device generates noise by adjusting the flow of high pressure gas.
Preferably, high pressure gas is introduced into high sound intensity reverberation chamber by pressure piping in step 1), outside reverberation chamber
High pressure gas control valve is installed, convenient for the switch of high pressure gas and the adjusting of throughput size on pressure duct.
Preferably, the high sound intensity reverberation chamber to have come into operation is drawn high pressure gas by additionally increasing high-pressure gas pipelines
Enter in reverberation chamber, when new reverberation chamber design can be with pre-buried high-pressure gas pipelines.
Preferably, the width of jet pipe is slightly less than the width of cavity in step 3).
Preferably, the design process of step 2) includes the following steps:
Step 1: loading spectrum debugging is carried out in high sound intensity reverberation chamber, ability reaches under the conditions of obtaining existing speaker configurations
The frequency band required less than loading spectrum；
Step 2: the depth of cavity is calculated by formula (1), frequency values are chosen for high sound intensity reverberation chamber high-frequency energy when calculating
One third octave center frequency/octave center frequency of the lowest band of power shortcoming, the length depth ratio of cavity are empty less than 2
The width of chamber is taken as 0.7~1.4 times of cavity depth；
Wherein, h is the depth of cavity；C is the velocity of sound；N is mode number；fNFor the resonance frequency of N rank mode, N=1,2,
3 ..., if f1> 500Hz, only uses f1。
Preferably, step 3) designs jet pipe by formula (2), and the width dimensions of outlet and the width of cavity are essentially identical,
The height of outlet is the half of width, and inlet size is identical as the size of high-pressure gas pipelines, sets after Wei Duoxinsi base curves
Count one section of sectional dimension and the identical jet pipe of Wei Duoxinsi base curves outlet size；
Wherein S0 is discharge area, and S1 is inlet -duct area, and l is to shrink segment length, and x is length, and S is area.
Preferably, the detailed process of step 4) are as follows: cavity sounding device is installed in high sound intensity reverberation chamber, loud
High-intensity microphone is arranged in strong reverberation chamber；Enter high pressure gas in cavity sounding device by jet pipe；Obtain cavity sounding
Sound field of the device in high sound intensity reverberation chamber；Electropneumatic loudspeaker and cavity sounding are used in combination in high sound intensity reverberation chamber
Device.
Preferably, it completes step 4) and carries out reverberation chamber Free field measurement afterwards, cavity sounding device and jet pipe are installed on reverberation
On indoor high-pressure gas pipelines, cavities open is towards among reverberation chamber；3~4 high-intensity microphones are arranged in reverberation chamber,
High-intensity microphone quantity can also select as needed；High pressure gas control valve is opened, sound field is carried out with acoustics acquisition system
Measurement.
Preferably, reverberation chamber sound field combined debugging is carried out after completing reverberation chamber Free field measurement, by cavity sounding device and is mixed
It rings the electropneumatic loudspeaker that room itself configures and carries out combined debugging, sound field indicators are carried out using closed-loop control system, acoustics is adopted
Collecting system carries out acoustic field.
The invention has the advantages that improving the acoustic pressure on high sound intensity reverberation chamber high frequency by the principle using cavity noise
Grade generates cavity noise, not only goes back simultaneously comprising a series of pure tone noises in cavity noise when high pressure gas enters cavity
There is broadband random noise, the flow by adjusting high pressure gas can control the size of noise, and cavity noise is more in reverberation chamber
Uniform reverberation noise field is formed after secondary reflection, to improve sound pressure level of the high sound intensity reverberation chamber on high frequency.Using this side
Method improves sound pressure level of the high sound intensity reverberation chamber on high frequency compared with using the method for increasing high-frequency electric compressed-air loudspeaker, at
This is low, and risk is small, and this method can targetedly improve the sound pressure level of the frequency band of high sound intensity reverberation chamber high-frequency ability shortcoming,
And the method, which can be not only used for the high sound intensity reverberation chamber capability improving used has been put into, can also be used in new reverberation chamber design.
Detailed description of the invention
Fig. 1 is of the invention a kind of for improving the method schematic diagram of high sound intensity reverberation chamber high frequency sound pressure level.
Fig. 2 is 500m in the embodiment of the present invention3Free field measurement spectrum of the present invention in reverberation chamber.
Fig. 3 is that the present invention is not used in 500m3The load spectrogram of overall sound pressure level 144dB is debugged in reverberation chamber.
Fig. 4 is 500m in the embodiment of the present invention3The loading spectrum of present invention debugging overall sound pressure level 144dB is used in reverberation chamber
Figure.
Fig. 5 is 500m in the embodiment of the present invention3The loading spectrum of present invention debugging overall sound pressure level 148dB is used in reverberation chamber
Figure.
In figure: 1- high sound intensity reverberation chamber, 2- high-pressure gas pipelines, 3- high pressure gas control valve, 4- jet pipe, 5- cavity hair
Acoustic device.
Specific embodiment
Below by embodiment, the present invention is described further:
If improving the sound pressure level of high-strength reverberation chamber medium-high frequency section, need to increase the number of high-frequency electric compressed-air loudspeaker
Amount, high-frequency electric compressed-air loudspeaker EPT-200 is not only expensive, and purchases there are certain risk, and high sound intensity reverberation chamber
Horn mouth is fixed, the quantity of Yao Zengjia high-frequency electric compressed-air loudspeaker, will certainly reduce low frequency or intermediate frequency driven airflow is raised
The quantity of sound device, and intermediate frequency/low frequency electropneumatic loudspeaker and the output end cross-sectional area of high-frequency electric compressed-air loudspeaker are different
Sample also needs to redesign processing loudspeaker section if to increase high-frequency electric compressed-air loudspeaker.The present invention takes cavity noise
Principle designs high frequency sounding device, and high pressure gas is introduced high frequency cavity by the jet pipe designed according to Wei Duoxinsi base curves
In sounding device, high sound intensity reverberation chamber medium-high frequency sound pressure level purpose is improved to realize.
A method of for improving high sound intensity reverberation chamber high frequency sound pressure level, specific steps include:
Step 1: high pressure gas is introduced in high sound intensity reverberation chamber.High pressure gas introducing high sound intensity is mixed by pressure piping
It rings in room, high pressure gas control valve can be installed on the pressure duct outside reverberation chamber, convenient for the switch and air-flow of high pressure gas
Measure the adjusting of size；
Step 2: design cavity sounding device.Since the reverberation chamber is when certain loading spectrum is debugged, octave center frequency
The requirement of loading spectrum is not achieved for the sound pressure level of tri- frequency bands of 2000Hz, 4000Hz, 8000Hz for rate, therefore according to cavity resonance
Calculation formula, designs a cavity, and the size of cavity is designed according to resonance frequency for 2000Hz；
Step 3: Nozzle Design.Jet pipe is designed according to Wei Duoxinsi base curves, the width of jet pipe is made to be slightly less than cavity
Width.
Cavity sounding device is installed in high sound intensity reverberation chamber by step 4, is introduced high pressure gas, is generated high very noisy.
Reverberation chamber Free field measurement: cavity sounding device and jet pipe are installed on the indoor high-pressure gas pipelines of reverberation, empty
Chamber is open towards among reverberation chamber；3~4 high-intensity microphones are arranged in reverberation chamber；High pressure gas control valve is opened, acoustics is used
Acquisition system measures sound field.
Reverberation chamber sound field combined debugging: after completing reverberation chamber Free field measurement, cavity sounding device and reverberation chamber itself are matched
The electropneumatic loudspeaker set carries out combined debugging.Sound field indicators are carried out using closed-loop control system, acoustics acquisition system carries out
Acoustic field.
Embodiment
In 500m3Reverberation chamber introduces high pressure gas by pressure piping, installs on the indoor high-pressure gas pipelines of reverberation
According to Wei Duoxinsi base curves design jet pipe and one design resonance frequency be 2000Hz cavity sounding device, then into
Row reverberation chamber Free field measurement and reverberation chamber sound field combined debugging carry out Free field measurement to high sound intensity reverberation chamber.
Cavity sounding device is obtained in 500m3Noise PSD figure when being used alone in reverberation chamber is as shown in Figure 2.
Certain test requirements document spectral pattern such as table 1, before unused cavity sounding device, which is the noise of 144dB
Loading spectrum is in 500m3Debugging result in reverberation chamber fig. 3, it is shown that be not used sounding device before, octave
The sound pressure level of centre frequency 2000Hz can meet the requirements the lower limit of value reluctantly, and octave center frequency 4000Hz, 8000Hz
Actual value distinguish poor 5dB, 6dB than required value lower limit.After cavity sounding device, 500m3Reverberation chamber is not increasing height
In the case where frequency electropneumatic loudspeaker, spectral pattern overall sound pressure level 144dB (Fig. 4), but also the total sound of the spectral pattern not only can satisfy
Highest of arbitrarily downgrading can achieve 148dB (Fig. 5).
Table 1 requires spectral pattern
Claims (9)
1. a kind of method for improving high sound intensity reverberation chamber high frequency sound pressure level, which comprises the steps of:
1) high pressure gas is introduced into high sound intensity reverberation chamber；
2) cavity sounding device is designed using cavity noise principle；
3) jet pipe is designed using Wei Duoxinsi base curves formula；
4) it flows into high pressure gas in cavity sounding device by jet pipe and generates noise to improve high sound intensity reverberation chamber high frequency
Sound pressure level controls the size that cavity sounding device generates noise by adjusting the flow of high pressure gas.
2. a kind of method for improving high sound intensity reverberation chamber high frequency sound pressure level as described in claim 1, which is characterized in that step
It is rapid 1) in high pressure gas is introduced into high sound intensity reverberation chamber by pressure piping, high pressure is installed on the pressure duct outside reverberation chamber
Gas control valve, convenient for the switch of high pressure gas and the adjusting of throughput size.
3. a kind of method for improving high sound intensity reverberation chamber high frequency sound pressure level as described in claim 1, which is characterized in that
High pressure gas is introduced into reverberation chamber by the high sound intensity reverberation chamber to come into operation by additionally increasing high-pressure gas pipelines, new reverberation chamber
It can be with pre-buried high-pressure gas pipelines when design.
4. a kind of method for improving high sound intensity reverberation chamber high frequency sound pressure level as described in claim 1, which is characterized in that step
It is rapid 3) in the width of jet pipe be slightly less than the width of cavity.
5. a kind of method for improving high sound intensity reverberation chamber high frequency sound pressure level as described in claim 1, which is characterized in that step
Rapid design process 2) includes the following steps:
Step 1: loading spectrum debugging is carried out in high sound intensity reverberation chamber, load is not achieved in ability under the conditions of obtaining existing speaker configurations
The frequency band that lotus spectrum requires；
Step 2: the depth of cavity is calculated by formula (1), frequency values are chosen for high sound intensity reverberation chamber high-frequency ability and owe when calculating
One third octave center frequency/octave center frequency of scarce lowest band, the length depth ratio of cavity less than 2, cavity
Width is taken as 0.7~1.4 times of cavity depth；
Wherein, h is the depth of cavity；C is the velocity of sound；N is mode number；fNFor the resonance frequency of N rank mode, N=1,2,3 ..., such as
Fruit f1> 500Hz, only uses f1。
6. a kind of method for improving high sound intensity reverberation chamber high frequency sound pressure level as described in claim 1, which is characterized in that step
Rapid 3) to design jet pipe by formula (2), the width dimensions of outlet and the width of cavity are essentially identical, and the height of outlet is width
Half, inlet size is identical as the size of high-pressure gas pipelines, and one section of sectional dimension and dimension are designed after Wei Duoxinsi base curves
This mostly pungent identical jet pipe of base curves outlet size；
Wherein S0 is discharge area, and S1 is inlet -duct area, and l is to shrink segment length, and x is length, and S is area.
7. a kind of method for improving high sound intensity reverberation chamber high frequency sound pressure level as described in claim 1, which is characterized in that step
Rapid detailed process 4) are as follows: cavity sounding device is installed in high sound intensity reverberation chamber, is arranged in high sound intensity reverberation chamber loud
Strong microphone；Enter high pressure gas in cavity by jet pipe；Obtain sound field of the cavity in high sound intensity reverberation chamber；In high sound intensity
Electropneumatic loudspeaker and cavity sounding device are used in combination in reverberation chamber.
8. a kind of method for improving high sound intensity reverberation chamber high frequency sound pressure level as claimed in claim 2, which is characterized in that complete
Reverberation chamber Free field measurement is carried out afterwards at step 4), and cavity sounding device and jet pipe are installed on the indoor high-pressure gas pipelines of reverberation
On, cavities open is towards among reverberation chamber；High-intensity microphone is arranged in reverberation chamber；High pressure gas control valve is opened, acoustics is used
Acquisition system measures sound field.
9. a kind of method for improving high sound intensity reverberation chamber high frequency sound pressure level as claimed in claim 8, which is characterized in that complete
At reverberation chamber sound field combined debugging is carried out after reverberation chamber Free field measurement, cavity sounding device is configured with reverberation chamber itself electronic
Compressed-air loudspeaker carries out combined debugging, carries out sound field indicators using closed-loop control system, acoustics acquisition system carries out acoustic field.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114046874A (en) * | 2022-01-11 | 2022-02-15 | 中国空气动力研究与发展中心高速空气动力研究所 | Test device for measuring supersonic jet near-field noise |
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| US4482026A (en) * | 1982-12-02 | 1984-11-13 | Stehlin Jr George D | Loudspeaker enclosure |
| CN102004022A (en) * | 2010-11-29 | 2011-04-06 | 苏州苏试试验仪器有限公司 | Vibration and noise complex experiment equipment |
| CN104091590A (en) * | 2014-07-10 | 2014-10-08 | 北京卫星环境工程研究所 | Simulating device of high-sound-intensity sound field |
-
2019
- 2019-05-09 CN CN201910384396.7A patent/CN110139190B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4482026A (en) * | 1982-12-02 | 1984-11-13 | Stehlin Jr George D | Loudspeaker enclosure |
| CN102004022A (en) * | 2010-11-29 | 2011-04-06 | 苏州苏试试验仪器有限公司 | Vibration and noise complex experiment equipment |
| CN104091590A (en) * | 2014-07-10 | 2014-10-08 | 北京卫星环境工程研究所 | Simulating device of high-sound-intensity sound field |
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| 张利、高英、洪利: "高声强混响室噪声实验经典声谱控制方案", 《航天器环境工程》 * |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114046874A (en) * | 2022-01-11 | 2022-02-15 | 中国空气动力研究与发展中心高速空气动力研究所 | Test device for measuring supersonic jet near-field noise |
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