CN104457970B - A kind of half silencer box of broadband measurement - Google Patents
A kind of half silencer box of broadband measurement Download PDFInfo
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- CN104457970B CN104457970B CN201410673803.3A CN201410673803A CN104457970B CN 104457970 B CN104457970 B CN 104457970B CN 201410673803 A CN201410673803 A CN 201410673803A CN 104457970 B CN104457970 B CN 104457970B
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Abstract
Half silencer box of a kind of broadband measurement, including tubular babinet；Babinet center sets measuring microphone, inner wall arrangement sound-absorbing material or sound absorption structure in all faces of the babinet in addition to the face for installing object to be measured, the space standoff distance for making the surface of microphone and sound-absorbing material or sound absorption structure is more than 20cm, space standoff distance is related with the minimum measurement frequency measured, minimum measurement frequency is lower, and space standoff distance is bigger.The cross section of tubular box house of the present invention is polygon；Outer case cross section is rectangle.Babinet includes sound insulation and sound-absorbing material takes up space small, larger without volume special test cabinet, easy to use, facilitates large-scale product quality detection, reduces production test cost；Sound insulation and sound-absorbing material firmly install, and test operation is easy；Since sound insulation property is good, measuring device is small by external interference degree, therefore measuring accuracy is high, and test data is reproducible, and can be used in a variety of different environment.
Description
First, technical field
The present invention relates to a kind of half silencer box of broadband measurement, or perhaps the noise elimination of approximate semianechoic room measurement effect
Device.
2nd, background technology
The microphone devices such as loud speaker, mobile phone, acoustical behavior, such as frequency response, total harmonic distortion, it is desirable that in free field
It is measured under the conditions of (anechoic room) or semi-free field (semianechoic room).But anechoic room or semianechoic room volume is big, cost is high,
It is particularly inconvenient for operation in the production line.Then a kind of broadband measurement of anechoic room or semianechoic room measurement effect can be simulated
Become the only selection of industry with half silencer box, approximate anechoic room is reached in the range of defined measurement frequency or semianechoic room is surveyed
The effect of amount.
When the prior art is simulated anechoic room or semianechoic room and is measured, especially to loud speaker, mobile phone etc. low-frequency range sound
Performance measurement is learned, such as low frequency reaches 100Hz (or even 75Hz, 50Hz) the noise elimination prepared using wedge mineral wool sound-absorbing material
Box structure, but the babinet of 3 meters or more large scale is needed, this can be equal to the volume of an anechoic room completely, of high cost.And in life
It is practical extremely difficult in production, do not meet the design requirement of ergonomic (production operation personnel are extremely inconvenient when in use) yet.Permitted at present
More communication products, photovoltaic, household appliances, electronic product etc. can all use such silencer box to carry out acoustics or noise test,
Such as computer, mobile phone, motor, power supply manufacturing enterprise.Silencer box product is mainly used in：The noise measuring of computer and attachment
And quality control, communication products, electro-acoustic product, small-sized fans, scientific research acoustical testing.Existing silencer box specification feature：(1) in
Portion absorbs sound：>Acoustic absorptivity α during 250Hz>0.9；(2) free space：It is designed according to consumer products feature；(3) product structure：It is multiple
Close steel plate sound insulating structure, tablet sound absorber；(4) measuring system：Microphone is fixed in the case, and measuring instrument is selected；(5) noise refers to
Mark：Ensure external noise be less than 75dBA when case in noise<26dBA.
CN201310424311 proposes a kind of silencer box, including sound-proof wall body and sound arrester, the sound arrester packet
Acoustical cotton and sound-absorbing cloth are included, the acoustical cotton is uniformly mounted on the inside of the sound-proof wall body, and the sound-absorbing cloth bag assists the suction
Sound cotton.However sound-absorbing cloth bag assists the sound absorption effect of acoustical cotton far from comparable with anechoic room.
CN200620172780. characteristic measuring device of sound insulation, the sound insulation property for being mainly used for light sound-insulation material measure.
Include silencer box and reverberation box, silencer box lower ending opening, reverberation box upper end opening, reverberation box and silencer box pass through upper and lower end
The engagement of opening makes two casees to be connected as one, and partition board is provided between silencer box and reverberation box；The tank wall of the silencer box
For MULTILAYER COMPOSITE sound absorption structure, the tank wall of the reverberation box is MULTILAYER COMPOSITE damping structure, is provided with doorframe on silencer box, at doorframe
Soundproof door is installed.
CN201310407449 discloses a kind of silencer, and including upper wall, lower wall, left wall and right wall, wherein upper wall is under
Wall is separately installed with multiple upper anechoic sheets and multiple lower anechoic sheets, and left wall and right wall set air inlet and air outlet respectively.It is described
Multiple upper anechoic sheets and multiple lower anechoic sheets are mutually staggered arrangement on the left and right directions of silencer and upper and lower directions.
CN201220355858 discloses a kind of handset audio device for quick testing, including support portion, compressed part and
Test department.The support portion is used to place mobile phone.The compressed part is arranged on the side of the support portion and including fast ram pressure
To compress mobile phone.The test department includes artificial mouth and artitificial ear, and the artificial mouth is directed at the microphone of mobile phone, and described artificial
Ear is directed at the loud speaker of mobile phone.The mobile phone on production line is carried out with realizing by setting support portion, compressed part and test department
The quick test of audio performance.Due to the limitation in space, the semianechoic room close to preferable free field is built and used without condition,
It is to need most and practical pursuit that may only need to establish a smaller sound insulation environment of a volume close to free field.
3rd, invention content
The present invention seeks to propose a kind of silencer box, half silencer box of especially a kind of broadband measurement reaches
Internal background noise is low under test environment, and provides the approximate Half free sound field space of cutoff frequency 100Hz (even lower).From
And it can be ensured that the accuracy of measurement and repeatable and measuring speed.Certainly, having small size and meeting ergonomic makes
It is more preferable with condition.
The technical scheme is that a kind of half silencer box of broadband measurement, including tubular babinet；It is characterized in that babinet
Center setting measuring microphone stent, in institute of the babinet in addition to the upper cover plate for installing object (such as loud speaker, mobile phone etc.) to be measured
There are the inner wall arrangement sound-absorbing material or sound absorption structure in face, be separated by the space of microphone and sound-absorbing material or the surface of sound absorption structure
Distance is more than 20cm, and space standoff distance is related with the minimum measurement frequency measured, and minimum measurement frequency is lower, and space is separated by
Distance is bigger.
Further, the cross section of tubular box house is polygon, and the cross section outside tubular babinet is rectangle；
Further, the sound-absorbing material for being arranged in four walls may be arranged to concave-convex alternate structure, and the concave-convex period is (2~10)
cm；
Further, the cylinder bottom position surrounding arrangement diffusion sound absorption composite construction in cylinder inner cylinder height below 1/4 or so, cylinder are high
Diffusion sound absorption composite construction is arranged in the position of more than 1/4 or so degree in 1/3 perimeter locations of surrounding at least.Diffusion sound absorption composite junction
The finished surface of structure and interior are into (130 °~170 °) angle；
Further, barrel and tube end plate have porous plate, absorbent treatment, acoustic damping layer and outer sound insulating layer；
Further, installation measures loud speaker on cover plate, and cover plate is inclined, horizontal by (10 ° -35 °) angle.Lid
Plate setting is fixed and pressing device, to ensure the air-tightness of object to be measured (such as loud speaker, mobile phone) after installation is complete.
The beneficial effects of the present invention are：It is small that babinet includes insulating against sound and sound-absorbing material takes up space, larger without volume
Special test cabinet, it is easy to use, large-scale product quality is facilitated to detect, reduces production test cost；Sound insulation and sound absorption material
Material firmly installs, and test operation is easy；Since sound insulation property is good, measuring device is small by external interference degree, therefore measuring accuracy
Height, test data is reproducible, and can be used in a variety of different environment.The silencer box of the present invention for Microspeaker and
The acoustic measurement of complete machine (such as mobile phone, tablet computer, laptop), including other loud speakers and microphone acoustic measurement；This
Invention can simulate the sufficiently low background environment of background noise, and provide approximate the half of cutoff frequency 100Hz (even lower)
Free found field space.So as to ensure the accuracy measured and repeatability and measuring speed.The configuration design having is more
Meet ergonomic.Diffusion sound absorption composite construction can generate noise refraction or the diffraction that multiple noiseless influences, so as to disappear
Noise content is subtracted；To loudspeaker audio device for quick testing, the time is saved, improves production efficiency.
4th, it illustrates
Fig. 1 is schematic structural view of the invention.
5th, specific embodiment
As shown in the figure, diffusion sound absorption composite construction 1, cylinder lower floor second diffusion sound absorption composite construction 2, test upper cover plate 3,
Divide baffle mounting hole 4, microphone arm 5, outer layer sound insulating layer 6, damping and absorbent treatment 7, resonance sound-absorbing layer 8, internal layer sound-absorbing material
9th, isolation mounting or universal wheel 10.
Half silencer box of a kind of broadband measurement, including tubular babinet；Its middle case center sets measuring microphone stent,
In the inner wall arrangement sound-absorbing material in all faces of the babinet in addition to the face for installing object (such as loud speaker, mobile phone) to be measured or sound absorption
Structure, the space standoff distance for making the surface of microphone and sound-absorbing material or sound absorption structure are more than 20cm, space standoff distance
Related with the minimum measurement frequency of measurement, minimum measurement frequency is lower, and space standoff distance is bigger.It is installed on microphone arm 5
Measuring microphone, position ensure that noise background herein is low, the negative effect of measurement can be neglected in the position of central upper
Slightly.
The cross section of tubular box house is polygon, and the especially cross section outside tubular babinet is rectangle, is originally embodied as
Rectangle, especially square；Sound-absorbing material is arranged at least in four walls of cylinder forms diffusion sound absorption composite construction 1, cylinder lower floor
Second diffusion sound absorption composite construction 2, the diffusion sound absorption composite construction are concave-convex alternate structures, and the concave-convex period is (2~10)
Cm, especially (3~5) cm；Sound absorption composite construction is spread in cylinder bottom position surrounding arrangement of the cylinder inner cylinder height below 1/4 or so,
Diffusion sound absorption composite construction is at least arranged in the position of more than 1/4 or so cylinder height in 1/3 perimeter locations of surrounding.
Finished surface and the interior of diffusion sound absorption composite construction are into (130 °~170 °) angle.Barrel and tube end plate tool
There are porous plate, absorbent treatment, acoustic damping layer and outer sound insulating layer.Object to be measured (such as loud speaker, mobile phone), cover are installed on cover plate
Plate is inclined, and cover plate also so coordinates horizontal by (10 °~35 °) angle, corresponding barrel plate, and two pieces of sidings are ladders
Shape.Cover board setting is fixed and pressing device, to ensure object to be measured (such as loud speaker, mobile phone) after installation is complete airtight
Property.Barrel plate outside plate has certain oise insulation factor and rigid material using medium density fiberboard, clamping plate etc..Sound-absorbing material is arranged as concave-convex phase
Between structure, it is preferable with bulk material overlapping.Barrel and tube end plate have porous plate, absorbent treatment, acoustic damping layer and outer sound insulating layer.
Object to be measured (such as loud speaker, mobile phone) is installed, cover plate is inclined, with horizontal plane (ground) in 10-35 degree on cover plate.
The fixing bracket of measuring microphone uses hollow metal tube, vertical with upper cover plate, is installed on bottom plate, measures transaudient
Device band clamp device is installed in metal tube, and data line is pierced by from hollow pipe.When (the minimum survey of measurement frequency range to low frequency
Measure frequency) 100Hz when, babinet cross section be rectangle size be (80~120) cm* (80~120) cm；Box height is (70
~110) cm, wall thickness are (8-15) cm.When the lower limit of measurement frequency range is higher than 100Hz, the size of babinet can be with smaller.
The space in the gap of microphone, which can reach more than 20cm, good effect.100Hz, and the cross section of chest is rectangle
When, the size of rectangle is (80~120) cm* (80~120) cm；Box height be (70~110) cm, wall thickness for (8~
15)cm。
Cover board setting is fixed and pressing device, ensureing object to be measured (such as loud speaker, mobile phone etc.) after installation is complete
Air-tightness.
Bottom be equipped with universal wheel (under traffic condition) or/and isolation mounting (under conditions of use can anti-outside vibrational energy
Amount enters).
Although the present invention is disclosed above with preferred embodiment, however, it is not to limit the invention.Skill belonging to the present invention
Art field has usually intellectual, without departing from the spirit and scope of the present invention, when various modifications may be made and retouch.Therefore,
Protection scope of the present invention, when subject to those as defined in claim.
Claims (2)
1. a kind of half silencer box of broadband measurement, including tubular babinet；It is characterized in that babinet center sets measuring microphone,
The inner wall in all faces of the babinet in addition to the face for installing loud speaker object to be measured arranges sound absorption structure, makes microphone and sound-absorbing material
Or the space standoff distance on the surface of sound absorption structure is more than 20cm, space standoff distance has with the minimum measurement frequency measured
It closes, minimum measurement frequency is lower, and space standoff distance is bigger；
The cross section of tubular box house is polygon or rectangle；
Sound-absorbing material is arranged as concave-convex alternate structure, and the concave-convex period is 2-10cm；In cylinder bottom of the cylinder inner cylinder height below 1/4
Position surrounding arrangement diffusion sound absorption composite construction, the position of more than 1/4 cylinder height is at least arranged in 1/3 perimeter locations of surrounding spreads
Absorb sound composite construction；
The finished surface of diffusion sound absorption composite construction and interior are in 130 ~ 170 degree of angles；
Barrel and tube end plate have porous plate, absorbent treatment, rubber acoustic damping layer and outer sound insulating layer；To be measured raise one's voice is installed on cover plate
Implements part, cover plate are inclined, are in 10-35 degree with surface water plane；
Cover board setting is fixed and pressing device, to ensure the air-tightness of loud speaker object to be measured after installation is complete；
During to minimum measurement frequency 100Hz, the size of rectangle is 80 ~ 120 80 ~ 120cm of cm *；Box height is 70 ~ 110cm,
Wall thickness is 8-15cm.
2. a kind of half silencer box of broadband measurement according to claim 1, it is characterized in that bottom be equipped with isolation mounting or/
And universal wheel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410673803.3A CN104457970B (en) | 2014-11-21 | 2014-11-21 | A kind of half silencer box of broadband measurement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410673803.3A CN104457970B (en) | 2014-11-21 | 2014-11-21 | A kind of half silencer box of broadband measurement |
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| Publication Number | Publication Date |
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| CN104457970A CN104457970A (en) | 2015-03-25 |
| CN104457970B true CN104457970B (en) | 2018-07-06 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104713777A (en) * | 2013-12-11 | 2015-06-17 | 胡伟萍 | Tensile testing machine with safety guard and noise-proof function |
| CN107560722B (en) * | 2017-08-28 | 2019-10-01 | 华东交通大学 | A kind of the high-precision noise measuring method and noise contribution analysis method of box-beam structure |
| CN109286887A (en) * | 2018-09-20 | 2019-01-29 | 苏州岸肯电子科技有限公司 | Silencer box is used in a kind of test of loudspeaker |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5024290A (en) * | 1989-03-17 | 1991-06-18 | Lignoform Benken Ag | Sound absorbing panel for interior walls |
| CN200993649Y (en) * | 2006-12-30 | 2007-12-19 | 中国舰船研究设计中心 | Sound insulation performance measuring device |
| CN201708927U (en) * | 2010-06-25 | 2011-01-12 | 深圳市豪恩声学股份有限公司 | Sound insulation test case |
| CN103474057A (en) * | 2013-09-13 | 2013-12-25 | 苏州岸肯电子科技有限公司 | Silencing chamber |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007069816A (en) * | 2005-09-08 | 2007-03-22 | Kobe Steel Ltd | Double-wall structure |
-
2014
- 2014-11-21 CN CN201410673803.3A patent/CN104457970B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5024290A (en) * | 1989-03-17 | 1991-06-18 | Lignoform Benken Ag | Sound absorbing panel for interior walls |
| CN200993649Y (en) * | 2006-12-30 | 2007-12-19 | 中国舰船研究设计中心 | Sound insulation performance measuring device |
| CN201708927U (en) * | 2010-06-25 | 2011-01-12 | 深圳市豪恩声学股份有限公司 | Sound insulation test case |
| CN103474057A (en) * | 2013-09-13 | 2013-12-25 | 苏州岸肯电子科技有限公司 | Silencing chamber |
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| CN104457970A (en) | 2015-03-25 |
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