CN108489855A - A kind of sound-absorbing material flow resistance measuring instrument of temperature-controllable - Google Patents
A kind of sound-absorbing material flow resistance measuring instrument of temperature-controllable Download PDFInfo
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- CN108489855A CN108489855A CN201810327729.8A CN201810327729A CN108489855A CN 108489855 A CN108489855 A CN 108489855A CN 201810327729 A CN201810327729 A CN 201810327729A CN 108489855 A CN108489855 A CN 108489855A
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- 239000011358 absorbing material Substances 0.000 title claims abstract description 30
- 238000012360 testing method Methods 0.000 claims abstract description 99
- 238000010438 heat treatment Methods 0.000 claims abstract description 58
- 238000001514 detection method Methods 0.000 claims abstract description 16
- 230000005855 radiation Effects 0.000 claims abstract description 7
- 238000005259 measurement Methods 0.000 claims description 25
- 238000009530 blood pressure measurement Methods 0.000 claims description 8
- 230000004323 axial length Effects 0.000 claims description 6
- 239000000919 ceramic Substances 0.000 claims description 4
- 238000005086 pumping Methods 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 2
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- 241000208340 Araliaceae Species 0.000 claims 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 claims 1
- 235000003140 Panax quinquefolius Nutrition 0.000 claims 1
- 235000008434 ginseng Nutrition 0.000 claims 1
- 239000000463 material Substances 0.000 description 10
- 239000000523 sample Substances 0.000 description 8
- 238000013461 design Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 239000011148 porous material Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 238000004321 preservation Methods 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
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- 230000018109 developmental process Effects 0.000 description 1
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- 238000004088 simulation Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N7/00—Analysing materials by measuring the pressure or volume of a gas or vapour
- G01N7/10—Analysing materials by measuring the pressure or volume of a gas or vapour by allowing diffusion of components through a porous wall and measuring a pressure or volume difference
Abstract
The invention discloses a kind of sound-absorbing material flow resistance measuring instrument of temperature-controllable, test specimen cylinder is upright column cylinder, and heating collar has been fitted with test specimen medial wall of the tube；Turbogrid plates are installed using the axial gap between hypomere heating collar and epimere heating collar, test specimen is placed on Turbogrid plates, and test specimen cylinder is divided into lower barrel chamber and upper barrel chamber；Air source external hole is set in the bottom center of column cylinder, and is connected with aspiration pump by air source pipeline, pressure differential detection unit is set for lower barrel chamber and upper barrel chamber；Piston is set in the upper barrel chamber of test specimen cylinder, is moved using piston and carries out specimen thickness detection, infrared radiation thermometer is set above test specimen cylinder, for being detected to test specimen temperature.The present invention can obtain the flow resistance value of test specimen at a set temperature, and foundation is provided for concrete application of the sound-absorbing material in different temperatures environment.
Description
Technical field
The present invention relates to acoustic test equipment technical field, more specifically a kind of sound-absorbing material flow resistance measuring instrument.
Background technology
There is the hole being largely connected to, when sound wave enters material internal propagation, due to air inside sound-absorbing porous material
The heat transfer of viscosity and material, makes acoustic energy constantly be lost, and plays the role of sound absorption.Flow resistance is that sound-absorbing porous material is joined substantially
One of number is judgement material sound absorbing performance key factor.Therefore, in the basic research of acoustical material and the development of sound absorbing products
In, the measurement of flow resistance is important.The draught head and the ratio between the airflow volume speed by test specimen that flow resistance is defined as upper and lower both sides.
" flow resistance instrument adopting water tank method " (publication number disclosed in Chinese patent literature：CN 201319029, publication date：In September, 2009
30 days), steady air flow is obtained using adopting water tank method, although this method can ensure to flow through the stability of the air-flow of sample, energy
Enough flow resistance progress to sound-absorbing porous material are effectively measuring, but there are the problems such as bulky, inconvenient for use, not practical enough.
" a kind of instrument measured for air flow resistance " (publication number disclosed in Chinese patent literature：CN 104458200, publication date：
On March 25th, 2015), although this method is intuitive, economical, portable, sample can be lacked reliable and effective with and without loss measurement
Support and positioning, have certain influence to the accuracy of measurement result." a kind of sound-absorbing porous material disclosed in Chinese patent literature
Flow resistance measuring instrument " (publication number：CN 106918442, publication date：On July 4th, 2017), it, can although the technology structural volume is small
To sample reliably and efficiently support and position, but because test specimen cylinder front and back end internal diameter slightly has difference so that air-flow disengaging examination
The sectional area of sample differs, and then causes measurement result not accurate enough.
All it is in the prior art to carry out at normal temperatures about the measurement of flow resistance, does not there is the influence for considering temperature convection resistance.But
It is that when temperature changes, flow resistance can also change material therewith, and this phenomenon is particularly evident at high temperature, in fact, greatly
The application temperature of most sound-absorbing materials is quite high, for example normal domestic aero-engine nacelle surface temperature is up to 600 DEG C, existing
Measuring the material flow resistance of acquisition in technology under room temperature, there are larger difference, this measurements with the flow resistance in sound-absorbing material practical application
Data can not accurately reflect the sound absorbing performance of material.
Invention content
The present invention is to provide a kind of sound-absorbing material flow resistance of temperature-controllable to avoid above-mentioned deficiency of the prior art
Measuring instrument, by temperature control and measurement, the flow resistance value of acquisition test specimen at a set temperature is sound-absorbing material in different temperatures ring
Concrete application in border provides foundation, and also relationship provides safeguard between the flow resistance and temperature to study sound-absorbing material.
The present invention is to solve technical problem to adopt the following technical scheme that
The sound-absorbing material flow resistance measuring instrument of temperature-controllable of the present invention is structurally characterized in that：
It is upright column cylinder that test specimen cylinder, which is arranged, and the bottom end closure of column cylinder is equipped with end cap in the opening of top, is trying
In part cylinder, heating collar has been fitted with the madial wall of test specimen cylinder；The heating collar subsection setup is hypomere heating collar and upper
Section heating collar forms annular groove using the axial gap between hypomere heating collar and epimere heating collar, and Turbogrid plates are mounted on institute
It states in annular groove, test specimen is placed on the Turbogrid plates, and test specimen cylinder is made to be divided into lower barrel chamber and upper barrel chamber by test specimen plate；
Air source external hole is set in the bottom center of the column cylinder, the air source external hole passes through air source pipeline and pumping
Pump is connected, and gas flow sensor is arranged on the gas source pipe road；For in test specimen cylinder lower barrel chamber and upper barrel chamber setting
Pressure differential detection unit, including differential manometer and two drive tests being connected to are formed in differential manometer and the lower barrel chamber of test specimen cylinder and upper barrel chamber respectively
Pressure pipe road；The pressure differential detection unit is set as two sets on the radial symmetric position of test specimen cylinder；
Piston is set in the upper barrel chamber of the test specimen cylinder, and the rod end of piston rod is protruded out through end cap, convex in the piston rod
The rod end stretched is provided with thickness indicator, using movement of the piston in the upper barrel chamber of test specimen cylinder, and passes through thickness indicator pair
Specimen thickness is detected；
It in the top of the test specimen cylinder, is on the position of radial symmetric two groups of infrared radiation thermometers is set, for test specimen
Temperature is detected.
The design feature of the sound-absorbing material flow resistance measuring instrument of temperature-controllable of the present invention is lain also in：In upper barrel chamber and lower barrel chamber
Pressure tap is opened up on side wall, is upper barrel chamber pressure tap and lower barrel chamber pressure tap respectively, and the upper barrel chamber pressure tap, which is in, to be close to
At the height and position on the top of section heating collar, lower barrel chamber pressure tap is at the height and position for the bottom end for being close to hypomere heating collar；
The two-way pressure measurement pipeline one-to-one correspondence of differential manometer passes through upper barrel chamber pressure tap and lower barrel chamber pressure tap and upper barrel chamber and lower barrel chamber phase
Connection.
The design feature of the sound-absorbing material flow resistance measuring instrument of temperature-controllable of the present invention is lain also in：The hypomere heating collar and upper
Section heating collar internal diameter is identical, and thickness is equal；The axial length of the epimere heating collar is not less than twice of specimen thickness；Hypomere
The axial length of heating collar is not less than the thickness of test specimen.
The design feature of the sound-absorbing material flow resistance measuring instrument of temperature-controllable of the present invention is lain also in：The heating collar is using ceramics
Heating collar, it is high temperature resistant instrument that the flow resistance measuring instrument, which is arranged, includes being set on the outer wall of the test specimen cylinder and pressure measurement pipeline
Insulating layer is set, can smear insulating mold coating, tolerable temperature is not less than 850 DEG C.
The design feature of the sound-absorbing material flow resistance measuring instrument of temperature-controllable of the present invention is lain also in：The Turbogrid plates are uniformly to divide
It is furnished with the orifice plate of through-hole, the through-hole is the rectangular opening that bond length is not less than 10mm, and the punching rate on Turbogrid plates is not less than
80%；There are at a distance from enough between cylinder bottom of the Turbogrid plates with test specimen cylinder, so that air-flow is steady, enough distances
Refer to not small specimen diameter, and not less than the distance value of specimen thickness.
The design feature of the sound-absorbing material flow resistance measuring instrument of temperature-controllable of the present invention is lain also in：Following performance parameter is set：
The minimum linear velocity of the aspiration pump is 0.5 × 10-3m/s；
The differential manometer most low energy detects that the pressure values of 0.1Pa, differential manometer precision are at least ± 5%；
The flowmeter most low energy detection 0.5 × 10-3The flow value of m/s, flowmeter accuracy are at least ± 5%；
The temperature measurer highest measurement temperature is not less than 850 DEG C, and temperature measurer precision is at least ± 5%.
The design feature of the sound-absorbing material flow resistance measuring instrument of temperature-controllable of the present invention is lain also in：Flow resistance is realized as follows
It measures：
Test specimen is placed on test specimen cylinder inside grid by step 1, ensures the air-tightness between test specimen and test specimen barrel, profit
With the smooth test specimen of piston specimen thickness d is measured using thickness measurement equipment after test specimen naturally relaxation；
Step 2, heating collar are devoted oneself to work, and test specimen is heated and maintained at set temperature until test terminates；
Step 3 opens aspiration pump, as linear velocity qvStablize 0.5 × 10-3When m/s, the indicating value Δ of differential manometer is recorded
P, then flow measurement resistance R be：R=Δs p/qv。
Compared with the prior art, the present invention has the beneficial effect that：
1, present invention introduces heating collar, can simulation material actual work temperature, detection obtains material in actual work temperature
Under flow resistance value, more accurately reflect practical application in material sound absorbing performance, have important actual application value；
2, the built-in heating collar of present invention setting may be implemented to be rapidly heated by temperature control；Air-flow in its measurement process
It pulses small, steady air current is conducive to the raising of measurement accuracy；
3, double temperature probes are configured in the present invention, whether detect sound-absorbing material temperature using two groups of temperature probes uniform；And
It can be mutually authenticated with the measurement data of two groups of temperature probes, ensure the reliability of detection data；By by two groups of thermometrics
The measurement data of probe is averaged, and can improve measurement accuracy to a certain extent；
4, the present invention is for the double differential pressure measurement connectors of test specimen cylinder setting, and corresponds separate configurations differential manometer, two pressures
The measurement data of difference meter is mutually authenticated, and ensures the reliability of detection data；By the way that the measurement data of two differential manometers is put down
, measurement accuracy can be improved to a certain extent.
Description of the drawings
Fig. 1 is flow resistance instrument internal structure schematic diagram of the present invention.
Figure label：1 test specimen cylinder；2 end caps；3 epimere heating collars；4 hypomere heating collars；5 Turbogrid plates；6 bracing rings；7 pumpings
Pump；8 differential manometers；9 gas flow sensors；10 piston rods；11 infrared radiation thermometers；12 data collectors；13 computers；14 temperature controls
Device.
Specific implementation mode
Referring to Fig. 1, the structure type of the sound-absorbing material flow resistance measuring instrument of temperature-controllable is in the present embodiment：
It is upright column cylinder that test specimen cylinder 1, which is arranged, and the bottom end closure of column cylinder is equipped with end cap 2 in the opening of top, holds
2 one side of lid plays the role of heat preservation, on the other hand can reduce gas to a certain extent；In test specimen cylinder 1, with test specimen
The madial wall of cylinder 1 has been fitted heating collar；Heating collar subsection setup is hypomere heating collar 4 and epimere heating collar 3, under utilization
Axial gap between section heating collar 4 and epimere heating collar 3 forms annular groove, and Turbogrid plates 5 are mounted in annular groove, test specimen
It is placed on Turbogrid plates 5, test specimen cylinder 1 is made to be divided into lower barrel chamber and upper barrel chamber by test specimen plate.
Air source external hole is set in the bottom center of column cylinder, air source external hole is connected by air source pipeline with aspiration pump 7
It is logical, gas flow sensor 9 is set on gas source pipe road；For the lower barrel chamber and upper barrel chamber setting pressure differential detection in test specimen cylinder 1
Unit, including differential manometer 8 and the two-way pressure-measuring pipe being connected to is formed in differential manometer 8 and the lower barrel chamber of test specimen cylinder 1 and upper barrel chamber respectively
Road；Pressure differential detection unit is set as two sets on the radial symmetric position of test specimen cylinder 1.
Piston is set in the upper barrel chamber of test specimen cylinder 1, and the rod end of piston rod 10 is protruded out through end cap 2, protruded out in piston rod
Rod end is provided with thickness indicator, carries out Thickness sensitivity to test specimen using movement of the piston in the upper barrel chamber of test specimen cylinder 1, and lead to
It crosses thickness indicator and reads specimen thickness detected value, on the one hand piston for measuring specimen thickness, on the other hand can be used for smooth
Test specimen；It in the top of test specimen cylinder 1, is on the position of radial symmetric two groups of infrared radiation thermometers 11 is set, for test specimen temperature
It is detected.
Corresponding structure setting also includes in the present embodiment：
Column cylinder can be cylindrical drum, can also be cross sectional shape be rectangular or Else Rule polygon column cylinder.
Pressure tap is opened up on the side wall of upper barrel chamber and lower barrel chamber, is upper barrel chamber pressure tap and lower barrel chamber pressure tap respectively,
Upper barrel chamber pressure tap is at the height and position on the top for being close to epimere heating collar, and lower barrel chamber pressure tap, which is in, is close to hypomere heating
At the height and position of the bottom end of circle；The two-way pressure measurement pipeline of differential manometer 8 is corresponded to be surveyed by upper barrel chamber pressure tap and lower barrel chamber
Pressure mouth is connected with upper barrel chamber and lower barrel chamber.
Hypomere heating collar 4 is identical with 3 internal diameter of epimere heating collar, and thickness is equal；The axial length of epimere heating collar 3 is not small
In twice of specimen thickness；The axial length of hypomere heating collar 4 is not less than the thickness of test specimen.
Epimere heating collar 3 and hypomere heating collar 4 are all made of ceramic heat circle, and setting flow resistance measuring instrument is high temperature resistant instrument,
Include that insulating layer is set on the outer wall of test specimen cylinder 1 and pressure measurement pipeline, heat preservation can be formed by smearing insulating mold coating
Layer, tolerable temperature are not less than 850 DEG C.Insulating layer is conducive to the raising of heating rate, is conducive to the holding of set temperature, also reduces
Heat loss is realized energy saving.
Turbogrid plates 5 are the orifice plate for being evenly distributed with through-hole, and through-hole is the rectangular opening that bond length is not less than 10mm, Turbogrid plates
Punching rate on 5 is not less than 80%；There are at a distance from enough between cylinder bottom of the Turbogrid plates 5 with test specimen cylinder 1, so that air-flow
Steadily, enough distances refer to not small specimen diameter, and not less than the distance value of specimen thickness；It is to add in hypomere in specific implementation
Bracing ring 6 is arranged in the bottom of gas ket 4, ensures the distance between the cylinder bottom of Turbogrid plates 5 and test specimen cylinder 1, support using bracing ring 6
The internal diameter of circle 6 is equal with the internal diameter of hypomere heating collar 4.
Corresponding performance parameter, which is arranged, is：The minimum linear velocity of aspiration pump 7 is 0.5 × 10-3m/s；Differential manometer is minimum
It can detect that the pressure values of 0.1Pa, differential manometer precision are at least ± 5%；Flowmeter most low energy detection 0.5 × 10-3The flow of m/s
Value, flowmeter accuracy are at least ± 5%；Temperature measurer highest measurement temperature is not less than 850 DEG C, and temperature measurer precision is at least ± 5%.
Corresponding dimensional parameters, which are arranged, is：The internal diameter of test specimen cylinder is 115mm, outer diameter 170mm, is highly 300mm, grid
The thickness of plate is 5mm；The height of supporting block is not less than 60mm；Heating collar internal diameter is 100mm, outer diameter 115mm, epimere heating
Enclose length 140mm, hypomere heating collar length 30mm；The heater of heating collar is that circle silk twines and scratches into spring-like and penetrate ceramic strip circle system
At outer cover is stainless steel；It is 23mm positioned at the air source external hole aperture of the bottom center of column cylinder；Upper barrel chamber pressure tap and lower cylinder
Chamber pressure tap is circular through hole, aperture 8.5mm；To coordinate infrared radiation thermometer, is taken a little convenient for thermometric, thermometric is set on end cap
Through-hole, aperture 30mm.
For the present invention, computer control system, including data collector 12, computer 13 and temperature controller 14 can be set,
Temperature controller 14 receives the instruction from computer, realizes the temperature automatic control to test specimen.
The flow resistance of sound-absorbing material increases with the increase of linear velocity in a certain range, and pumping is required in the present embodiment
Pump can provide sufficiently low line flow velocity, and minimum rate of accumulation flow velocity will reach 0.5 × 10-3M/s, it is ensured that flow resistance is not by the shadow of air velocity
It rings；The detection data of two sets of pressure difference detection units can be used for verifying each other, and measurement accuracy can be improved by averaged.
Likewise, two groups of infrared radiation thermometers can be used for verifying each other, its average value is sought, and will appreciate that the temperature of sound-absorbing material is equal
Even situation keeps temperature of the sound-absorbing material at center and peripheral almost the same by extending heating time；If test specimen be it is soft and
Compressible sound-absorbing material, such as foamed plastics should avoid forming gap at test specimen edge；If test specimen is hard test specimen, can
The position that gap can be formed is closed using greasy filth etc., ensures air-tightness.
The present invention measuring principle be：Test specimen is heated and maintained to the temperature of setting using heating collar；Utilize aspiration pump
One way stable air-flow is controlled by the test specimen in test specimen cylinder, measures the pressure difference caused by test specimen upper and lower ends face.
Flow resistance measuring instrument realizes that flow resistance measures as follows in the present embodiment：
Test specimen is placed on test specimen cylinder inside grid by step 1, ensures the air-tightness between test specimen and test specimen barrel, profit
With the smooth test specimen of piston specimen thickness d is measured using thickness measurement equipment after test specimen naturally relaxation；
Step 2, heating collar are devoted oneself to work, and test specimen is heated and maintained at set temperature until test terminates；
Step 3 opens aspiration pump, as linear velocity qvStablize 0.5 × 10-3When m/s, the indicating value Δ of differential manometer is recorded
P, then flow measurement resistance R be：R=Δs p/qv。
Claims (7)
1. a kind of sound-absorbing material flow resistance measuring instrument of temperature-controllable, it is characterized in that：
It is upright column cylinder that test specimen cylinder (1), which is arranged, and the bottom end closure of column cylinder is equipped with end cap (2) in the opening of top,
In test specimen cylinder (1), heating collar has been fitted with the madial wall of test specimen cylinder (1)；The heating collar subsection setup adds for hypomere
Gas ket (4) and epimere heating collar (3) form annular using the axial gap between hypomere heating collar (4) and epimere heating collar (3)
Groove, Turbogrid plates (5) are mounted in the annular groove, and test specimen is placed on the Turbogrid plates (5), makes test specimen cylinder (1) by trying
Part plate is divided into lower barrel chamber and upper barrel chamber；
Air source external hole is set in the bottom center of the column cylinder (1), the air source external hole passes through air source pipeline and pumping
Pump (7) is connected, and gas flow sensor (9) is arranged on the gas source pipe road；For lower barrel chamber in test specimen cylinder (1) and upper
Barrel chamber is arranged pressure differential detection unit, including differential manometer (8) and the lower barrel chamber in differential manometer (8) and test specimen cylinder (1) and upper cylinder respectively
Chamber forms the two-way pressure measurement pipeline of connection；The pressure differential detection unit is set as two on the radial symmetric position of test specimen cylinder (1)
Set；
Piston is set in the upper barrel chamber of the test specimen cylinder (1), and the rod end of piston rod is protruded out through end cap (2), in the piston rod
The rod end protruded out is provided with thickness indicator, using movement of the piston in the upper barrel chamber of test specimen cylinder (1), and is indicated by thickness
Device is detected specimen thickness；
It in the top of the test specimen cylinder (1), is on the position of radial symmetric two groups of infrared radiation thermometers is set, for test specimen temperature
Degree is detected.
2. the sound-absorbing material flow resistance measuring instrument of temperature-controllable according to claim 1, it is characterized in that：In upper barrel chamber and lower cylinder
Pressure tap is opened up on the side wall of chamber, is upper barrel chamber pressure tap and lower barrel chamber pressure tap respectively, and the upper barrel chamber pressure tap is in tightly
At the height and position for sticking the top of section heating collar, lower barrel chamber pressure tap is in the height and position for the bottom end for being close to hypomere heating collar
Place；The two-way pressure measurement pipeline of differential manometer (8) correspond by upper barrel chamber pressure tap and lower barrel chamber pressure tap and upper barrel chamber and under
Barrel chamber is connected.
3. the sound-absorbing material flow resistance measuring instrument of temperature-controllable according to claim 1, it is characterized in that：The hypomere heating collar
(4) identical with epimere heating collar (3) internal diameter, and thickness is equal；The axial length of the epimere heating collar (3) is thick not less than test specimen
Twice of degree；The axial length of hypomere heating collar (4) is not less than the thickness of test specimen.
4. the sound-absorbing material flow resistance measuring instrument of temperature-controllable according to claim 1, it is characterized in that：The heating collar uses
Ceramic heat circle, it is high temperature resistant instrument that the flow resistance measuring instrument, which is arranged, is included in the outer of the test specimen cylinder (1) and pressure measurement pipeline
Insulating layer is set on wall, can smear insulating mold coating, tolerable temperature is not less than 850 DEG C.
5. the sound-absorbing material flow resistance measuring instrument of temperature-controllable according to claim 1, it is characterized in that：The Turbogrid plates (5)
To be evenly distributed with the orifice plate of through-hole, the through-hole is the rectangular opening that bond length is not less than 10mm, the perforation on Turbogrid plates (5)
Rate is not less than 80%；In Turbogrid plates (5) there are at a distance from enough between the cylinder bottom of test specimen cylinder (1), so that air-flow is steady,
Enough distances refer to not small specimen diameter, and not less than the distance value of specimen thickness.
6. the sound-absorbing material flow resistance measuring instrument of temperature-controllable according to claim 1, it is characterized in that：Following performance ginseng is set
Number：
The minimum linear velocity of the aspiration pump is 0.5 × 10-3m/s；
The differential manometer most low energy detects that the pressure values of 0.1Pa, differential manometer precision are at least ± 5%；
The flowmeter most low energy detection 0.5 × 10-3The flow value of m/s, flowmeter accuracy are at least ± 5%；
The temperature measurer highest measurement temperature is not less than 850 DEG C, and temperature measurer precision is at least ± 5%.
7. the sound-absorbing material flow resistance measuring instrument of temperature-controllable according to claim 1, it is characterized in that：It realizes as follows
Flow resistance measures：
Test specimen is placed on test specimen cylinder inside grid by step 1, is ensured the air-tightness between test specimen and test specimen barrel, is utilized work
Smooth test specimen is filled in, after test specimen naturally relaxation, specimen thickness d is measured using thickness measurement equipment；
Step 2, heating collar are devoted oneself to work, and test specimen is heated and maintained at set temperature until test terminates；
Step 3 opens aspiration pump, as linear velocity qvStablize 0.5 × 10-3When m/s, the indicating value Δ p of differential manometer is recorded, then
Flow measurement hinders R：R=Δs p/qv。
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108982332A (en) * | 2018-09-26 | 2018-12-11 | 常州北埠电子技术有限公司 | A kind of the sound resistance test method and its test device of sound-absorbing material |
| 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 |
| CN110333176A (en) * | 2019-08-02 | 2019-10-15 | 柳州汉西鸣建材发展有限公司 | A kind of device and its measurement method of flux controllable measurement acoustics flow resistance |
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| CN106918442A (en) * | 2017-01-22 | 2017-07-04 | 中国测试技术研究院声学研究所 | A kind of sound-absorbing porous material flow resistance measuring instrument |
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