CN209589940U - AC type sound-absorbing porous material flow resistance measuring device - Google Patents
AC type sound-absorbing porous material flow resistance measuring device Download PDFInfo
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- CN209589940U CN209589940U CN201920093390.XU CN201920093390U CN209589940U CN 209589940 U CN209589940 U CN 209589940U CN 201920093390 U CN201920093390 U CN 201920093390U CN 209589940 U CN209589940 U CN 209589940U
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Abstract
The utility model discloses a kind of AC type sound-absorbing porous material flow resistance measuring devices, including driving device, piston and test cavity, the driving device is connect with piston, the end of piston and the end part aligning of test cavity, sealing film is installed in the end of piston and the end of test cavity, sealing film is mounted on test cavity by sealing cover, and the wall for testing cavity is equipped with through-hole, microphone is installed, microphone is successively connect with capture card, computer in through-hole；Porous material test specimen is installed in test chamber body, porous material test specimen passes through fixed device installation in the cavity；Driving device drives reciprocating motion of the pistons, generates alternation air-flow in the operatic tunes in test cavity, passes through the flow resistivity of the measured value of microphone you can get it porous material test specimen.A kind of AC type sound-absorbing porous material flow resistance measuring device of the utility model, it is rationally distributed, it is simple to operate, it is easy to carry out flow adjusting, measurement accuracy is high.
Description
Technical field
The present invention relates to AC type sound-absorbing porous material flow resistance measuring devices, belong to porous material performance test field.
Background technique
It the use of sound-absorbing material is the important measures realizing noise and passively controlling.Porous material is the most widely used at present
Sound-absorbing material, sound absorbing mechanism is complicated, and flow resistance is to characterize one of the important feature parameter of porous material acoustical behavior.American-European countries
Even more using flow resistivity as the quality index of sound-absorbing porous material product, the description of product must be forced to out the minimum flow resistance of product
Rate.China does not have Compulsory Feature to the flow resistance of sound-absorbing porous material at present, and the flow resistance that the country is exclusively used in sound-absorbing porous material is surveyed
The research for measuring device is fewer.Therefore, in order to preferably study the acoustic characteristic of porous material, to improve sound-absorbing porous material production
The sound absorbing performance of product, it is also particularly significant for the research and development of flow resistance measuring device.
It is at present that " acoustics sound-absorbing porous material flow resistance is surveyed according to GB/T25077-2010 to the flow resistance R of sound-absorbing porous material
Amount " measuring principle obtain, standard provides two kinds of measuring principles: direct current method and alternating current method.Direct current method is in order to obtain one
The volume design of stable pressure difference, apparatus is general bigger, is such as hindered using adopting water tank method flow measurement, inconvenient for operation and equipment is not
Both air flow modulation is easily carried out, differential manometer accuracy is inadequate, and measurement accuracy is relatively low.The device of existing alternating current method flow measurement resistance is big
It is mostly external product patent, price is more expensive, the cost of equipment higher cost for domestic enterprise.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, the present invention provides a kind of AC type porous sound absorption material
Stream hinders measuring device, rationally distributed, simple to operate, is easy to carry out flow adjusting, and measurement accuracy is high.
Technical solution: in order to solve the above technical problems, AC type sound-absorbing porous material flow resistance measuring device of the invention, packet
It includes driving device, piston and test cavity, the driving device to connect with piston, the end of piston and the end pair of test cavity
Together, sealing film is installed in the end of the end of piston and test cavity, sealing film is mounted on test chamber by sealing cover
On body, the wall for testing cavity is equipped with through-hole, is equipped with microphone in through-hole, microphone is successively connect with capture card, computer；
Porous material test specimen is installed in test chamber body, porous material test specimen passes through fixed device installation in the cavity；Driving device
Reciprocating motion of the pistons is driven, generates alternation air-flow in the operatic tunes in test cavity, that you can get it is more by the measured value of microphone
The flow resistivity of Porous materials test specimen.
Preferably, the driving device includes motor and connecting rod, the motor end is equipped with eccentric wheel, eccentric wheel with
Connecting rod is hinged, and the other end of connecting rod and the piston rod of piston are hinged, is rotated by motor powered eccentric wheel, and eccentric wheel drives connecting rod
Movement, so that piston rod be driven to move back and forth in piston.
Preferably, the fixed device includes a pair of of fixed-grid, porous material test specimen is placed on a pair of of fixed-grid
Centre, grid is fixed in the cavity by thickness measure sleeve, and thickness measure sleeve is mounted on test cavity.
Preferably, the thickness measure sleeve is equipped with scale.
Preferably, the low-limit frequency of the frequency response range of the microphone is lower than 2Hz.
The utility model has the advantages that AC type sound-absorbing porous material flow resistance measuring device of the invention, compared with prior art, system knot
Structure is simple, rationally distributed, simple to operate, is easy to carry out flow adjusting, and measurement accuracy is high.
The present invention is used as driving power using AC servo motor, can be accurate by the stroke of motor speed, driving piston
The virtual value q of the alternation airflow volume speed by porous material test specimen is calculated in groundv.rms, ensure that the essence of measurement
Degree.Compared to traditional adopting water tank method or compressed air method, tails off, pass through with the liquid level decline of dampening or storage cylinder inner air
The flow velocity of porous material test specimen air becomes unstable, will affect measuring accuracy.
The present invention is based on the flow resistances that alternating current method surveys porous material, alternation air flow pressure are measured using microphone, compared to straight
Stream method measures pressure difference using differential manometer, and the resolution ratio of microphone is higher, and response characteristic is more preferable, measures alternation gas pressure intensity precision more
Height ensure that the measurement accuracy of flow resistance.
The present invention is sealed between driving piston and the end face of test cavity using film, and end cover, biography
Sealing ring is housed, alternation air-flow is only by guaranteeing in porous material test specimen two sides between sensor mounting base and test cavity
The air-tightness of measuring device, ensure that the precision of test.
Detailed description of the invention
Fig. 1 is sound-absorbing porous material flow resistance measuring device main view of the present invention.
Fig. 2 is sound-absorbing porous material flow resistance measuring device test chamber body side surface cross-sectional view of the present invention.
Fig. 3 is that sound-absorbing porous material flow resistance measuring device of the present invention drives piston structure side sectional view.
Fig. 4 fixes for the test specimen of sound-absorbing porous material flow resistance measuring device of the present invention and thickness measure sleeve part
Figure.
Fig. 5 is the test specimen stationary grizzly part drawing of sound-absorbing porous material flow resistance measuring device of the present invention.
Fig. 6 is that the power that the alternation air-flow of sound-absorbing porous material flow resistance measuring device of the present invention generates transmits box
Figure.
Fig. 7 is the box that the alternation pressure measurer of sound-absorbing porous material flow resistance measuring device of the present invention connects
Figure.
Description of symbols: 1- horizontal checkout platform；2- servo motor erection support；3- AC servo motor；4- connecting rod；5-
Spring leaf connecting support；6- piston；7- sealing cover；8- tests cavity；9- cavity installs upper bracket；10- cavity installs undersetting；
11- thickness measure sleeve；12- microphone mounting base；13- microphone；14- sealing film；15- test specimen stationary grizzly；16- is porous
Material test specimen；17- gland；18-O type sealing ring.
Specific embodiment
The present invention will be further explained with reference to the accompanying drawing.
As shown in Figures 1 to 6, a kind of AC type sound-absorbing porous material flow resistance measuring device provided by the invention, including hand over
Alternation gas pressure intensity measuring device in change air flow-producing device, sound-absorbing porous material test piece fixing device and cavity, alternation air-flow
Generation device includes AC servo motor 3, electric machine controller, servo motor erection support 2, connecting rod 4, spring leaf mounting base 5, lives
Fill in 6, sealing film 14, end cover 7；Sound-absorbing porous material test piece fixing device includes test cavity 8, cavity installation upper bracket
9 and undersetting 10, test specimen stationary grizzly 15, thickness measure sleeve 11；Motor erection support 2 and spring leaf erection support 5 pass through
Bolt is fixed on horizontal checkout platform 1, and spring leaf erection support 5 is fixed by the bracket piston 6；Alternation gas pressure intensity measuring device
Including microphone 13, pistonphone, data collecting card, computer, data acquisition software；AC servo motor 3,4 and of connecting rod
Piston 6 links together, and piston includes piston rod, piston only and plunger shaft, and piston rod drives piston only in plunger shaft
Mobile, AC servo motor 3 at the uniform velocity rotates, and then connecting rod 4, piston 6 and sealing film 14 is driven to do reciprocating linear in the operatic tunes
Movement generates alternation air-flow in test cavity in the operatic tunes；Porous material test specimen 16 is clamped by two test specimen stationary grizzlies 15, is used
Test specimen fixes sleeve 11, bolt are fixed in test cavity 8；Microphone 13 is placed in the through-hole of microphone mounting base 12, and is used
Signal wire is sequentially connected data collecting card, computer.
As shown in figure 3, sealing film 14 is fixed on the end of driving piston 6, gland by gland 17 and O-ring seal 18
It is connected by screw bolts between 17 and piston 6, two sides will add rubber sheet gasket when connection, to guarantee air-tightness.
As shown in figure 4, thickness measure sleeve 11, side is machined with graduated scale, when not there is test specimen 16 to be placed in test chamber
When in body 8, two stationary grizzlies 15 of test specimen are stuck in test cavity 8 by sleeve 11, and test 8 end face of cavity is in the 0 of graduated scale
Graduation mark position；When test specimen 16 is placed in test cavity 8, it is tested that test 8 end face of cavity, which is in graduation mark position,
The thickness of test specimen 16, end flanges side are machined with through-hole, sleeve 11 can be fixed on test cavity 8 with bolt, prevent from being tested
Test specimen 16 slides under the action of alternation air-flow.
As shown in figure 5, test specimen stationary grizzly 15 is used to fixed bearing sound-absorbing porous material test specimen 16.
As shown in fig. 6, power is through AC servo motor 3, connecting rod 4, and piston 6 passes for alternation air flow-producing device
It passs, piston 6 drives sealing film 14, and then alternation air-flow is generated in cavity 8.3 main shaft of motor is equipped with eccentric wheel mechanism,
Constitute crank mechanism with connecting rod, the axis of 3 main shaft of motor and the axis of piston 6 should be in same level, eccentric wheel it is inclined
The heart is away from the maximum amplitude for being the linear motion of piston 6.When sealing film 14 is installed on 8 body end face of piston 6 and test chamber, sealed thin
Film 14 should be at equilbrium position and the state in tensioning, prevent the loosening of sealing film 14.
As shown in fig. 7, the measurement for alternation gas pressure intensity in cavity 8, fixation and thickness including test specimen 16 are surveyed
The transmitting of the signal of amount and alternation gas pressure intensity.The low-limit frequency of the frequency response range of microphone 13 should be lower than 2Hz, and pass
Sound device 13 calibrates its sensitivity with pistonphone before the use.
By taking once complete test as an example, the testing process of flow resistance measuring device is as follows:
A kind of flow resistance measurement method based on such as described flow resistance measuring device, comprising steps of
Step 1, tested porous material test specimen 16 is processed into cylindrical test specimen, makes 16 outer diameter of test specimen and examination
The outer diameter of part fixes sleeve 11 is equal, and the test specimen 16 processed is clipped between two test specimen stationary grizzlies 15, examination is passed through
Part fixes sleeve 11 is fixed in test cavity 8, and by the graduated scale above test specimen fixes sleeve 11, obtains test specimen
16 thickness d；
Step 2, using the sensitivity of pistonphone calibration microphone 13, microphone 13 is then placed in microphone installation
Microphone 13, data collecting card, computer, are sequentially connected by the through-hole of seat 12 with signal wire, open data acquisition software；
Step 3, AC servo motor 3 is driven, is 120r/ by the revolving speed that electric machine controller adjusts AC servo motor
Min, i.e. frequency are 2Hz, and then drive connecting rod 4, and piston 6 and sealing film 14 do linear reciprocating motion, are produced in test cavity 8
Raw alternation air-flow, calculates the virtual value q for generating the volume velocity of alternation air-flowv.rms；
Step 4, according to the virtual value q for the alternation airflow volume speed being calculatedv.rmsWith air-flow through test specimen
Effective area A obtains the linear velocity u that air-flow penetrates test specimenv.rms；
Step 5, microphone 13 measure cavity 8 in alternation gas pressure intensity P, measure alternation gas pressure intensity be an amplitude at any time
Between the sine curve that changes, maximum amplitude is Pa, PaWith virtual value PeffRelationship beIt, which is calculated, has
Valid value Peff；
Step 6, by alternation gas pressure intensity qv.rms, through the linear velocity P of test specimen 16effWith test specimen 16
Thickness d, can calculate sound-absorbing porous material test specimen flow resistivity r.
Specifically, for ease of adjusting the flow of alternation air-flow, the revolving speed n of motor 3 is also adjusted in the step 3
For 180r/min, 240r/min etc., the virtual value of the volume velocity of gained alternation air-flow seek include:
Step 31, the relationship of the frequency f generated by motor speed n and alternation air-flow are n=60f, obtain frequency f；
Step 32, the body that alternation air-flow is calculated by frequency f, piston motion amplitude h, piston radius r and end cover internal diameter R
The virtual value q of product speedv.rms, specially
Specifically, in the step 4, the virtual value q of alternation airflow volume speedv.rms, test specimen effective area
A and air-flow penetrate the linear velocity u of test specimenv.rmsBetween relationship be qv.rms=uv.rmsA。
Specifically, in the step 6, the expression formula of flow resistivity is
The above is only a preferred embodiment of the present invention, it should be pointed out that: for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (5)
1. a kind of AC type sound-absorbing porous material flow resistance measuring device, it is characterised in that: including driving device, piston and test chamber
Body, the driving device are connect with piston, the end of piston and the end part aligning of test cavity, end and test chamber in piston
The end of body is equipped with sealing film, and sealing film is mounted on test cavity by sealing cover, and the wall for testing cavity is equipped with
Through-hole is equipped with microphone in through-hole, and microphone is successively connect with capture card, computer；It is equipped in test chamber body porous
Material test specimen, porous material test specimen pass through fixed device installation in the cavity；Driving device drives reciprocating motion of the pistons, is testing
Cavity generates alternation air-flow in the operatic tunes, passes through the flow resistivity of the measured value of microphone you can get it porous material test specimen.
2. AC type sound-absorbing porous material flow resistance measuring device according to claim 1, it is characterised in that: the driving dress
It sets comprising motor and connecting rod, the motor end is equipped with eccentric wheel, and eccentric wheel is hinged with connecting rod, the other end and piston of connecting rod
Piston rod it is hinged, rotated by motor powered eccentric wheel, eccentric wheel drive link motion, to drive piston rod in piston
It moves back and forth.
3. AC type sound-absorbing porous material flow resistance measuring device according to claim 1, it is characterised in that: the fixed dress
It sets comprising a pair of of fixed-grid, porous material test specimen is placed among a pair of of fixed-grid, and grid is solid by thickness measure sleeve
Determine in the cavity, thickness measure sleeve is mounted on test cavity.
4. AC type sound-absorbing porous material flow resistance measuring device according to claim 3, it is characterised in that: the thickness is surveyed
It measures sleeve and is equipped with scale.
5. AC type sound-absorbing porous material flow resistance measuring device according to claim 1, it is characterised in that: the microphone
Frequency response range low-limit frequency be lower than 2Hz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920093390.XU CN209589940U (en) | 2019-01-21 | 2019-01-21 | AC type sound-absorbing porous material flow resistance measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920093390.XU CN209589940U (en) | 2019-01-21 | 2019-01-21 | AC type sound-absorbing porous material flow resistance measuring device |
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| Publication Number | Publication Date |
|---|---|
| CN209589940U true CN209589940U (en) | 2019-11-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920093390.XU Expired - Fee Related CN209589940U (en) | 2019-01-21 | 2019-01-21 | AC type sound-absorbing porous material flow resistance measuring device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109632965A (en) * | 2019-01-21 | 2019-04-16 | 山东理工大学 | AC type sound-absorbing porous material flow resistance measuring device and test method |
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2019
- 2019-01-21 CN CN201920093390.XU patent/CN209589940U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109632965A (en) * | 2019-01-21 | 2019-04-16 | 山东理工大学 | AC type sound-absorbing porous material flow resistance measuring device and test method |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191105 Termination date: 20210121 |
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| CF01 | Termination of patent right due to non-payment of annual fee |