CN212083331U - Acoustic impedance tube - Google Patents
Acoustic impedance tube Download PDFInfo
- Publication number
- CN212083331U CN212083331U CN202020678067.1U CN202020678067U CN212083331U CN 212083331 U CN212083331 U CN 212083331U CN 202020678067 U CN202020678067 U CN 202020678067U CN 212083331 U CN212083331 U CN 212083331U
- Authority
- CN
- China
- Prior art keywords
- tube
- telescopic
- positioning
- acoustic impedance
- impedance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000000463 material Substances 0.000 claims abstract description 22
- 238000005259 measurement Methods 0.000 claims description 13
- 239000003566 sealing material Substances 0.000 claims description 8
- 229910000838 Al alloy Inorganic materials 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 3
- -1 polytetrafluoroethylene Polymers 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 238000010521 absorption reaction Methods 0.000 description 14
- 239000000523 sample Substances 0.000 description 4
- 239000011358 absorbing material Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Images
Abstract
The utility model provides an acoustics impedance tube, including impedance tube, positioning disk, telescopic strut, the impedance tube includes fixed sleeving and telescopic tube, and telescopic tube's top is equipped with the speaker, and fixed sleeving's top is inserted to telescopic tube's bottom, is equipped with acoustics measuring sensor on fixed sleeving's the pipe wall, and the positioning disk is installed in fixed sleeving's bottom, the positioning disk is used for fixing acoustics impedance tube at the material surface of being surveyed, and telescopic strut's top is passed through the support and is connected with the speaker for adjust impedance tube overall height. The utility model discloses two telescoping devices in the acoustic impedance pipe can the person of facilitating the use adjust different device length to correspond different frequency and measure the volume of awaiting measuring material, improved the portability of acoustic impedance pipe.
Description
Technical Field
The utility model relates to an acoustics measures technical field, specifically is a novel portable acoustics impedance tube device.
Background
An acoustic impedance tube is a device for measuring the sound absorption coefficient of sound absorption material at normal incidence. The main body is a tube with a rectangular or circular section with rigid walls, and the linear degree of the section is much less than lambda/2; for a circular tube, the diameter should be less than 0.586 λ. The length of the tube is such that at the lowest measurement frequency at least one antinode and one node will be present in the tube. The sound source and the movable probe microphone are mounted at one end of the tube, and the other end is left as a sample of mounting material, which is mounted in the same way as the actual material. The acoustic source generates a plane wave within the tube, producing a partial reflection at the sample, forming a standing wave in front of it. And measuring the standing-wave ratio of the antinode and the node closest to the sample by using a microphone to obtain the sound absorption coefficient a.
The acoustic impedance tube is used for measuring the sound absorption and sound insulation coefficients of the sound absorption material, the sound absorption coefficient is automatically calculated according to the measured peak sound level value and the measured valley sound level value, a coordinate curve of the sound absorption coefficient and the frequency can be generated, the frequency and the amplitude of an output signal of an instrument can be freely set within a specified range, and the acoustic impedance tube is particularly suitable for teaching, research and design of the sound absorption material because only a small amount of the sound absorption material is needed to be used as a test piece.
At present, an impedance tube used in the field of acoustic measurement does not have a telescopic and portable function, is generally installed on an operation table through an impedance tube frame, can only carry out measurement by moving the position of an object to be measured, and cannot carry out measurement on a plurality of objects to be measured which cannot be moved or can be measured at one time, so that the impedance tube has great limitation.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an acoustic impedance tube for measure sound absorbing material's normal incidence acoustic absorption coefficient.
The technical scheme of the utility model:
the utility model provides an acoustics impedance tube, includes impedance tube, positioning disk, telescopic strut, the impedance tube includes fixed sleeving and telescopic tube, and telescopic tube's top is equipped with the speaker, and telescopic tube's bottom is inserted fixed sleeving's top, is equipped with acoustics measuring sensor on fixed sleeving's the pipe wall, and the positioning disk is installed in fixed sleeving's bottom, the positioning disk is used for fixing acoustics impedance tube at being surveyed the material surface, and telescopic strut's top is passed through the support and is connected with the speaker for adjust the whole height of impedance tube.
The acoustic measurement sensor is arranged perpendicular to the wall of the fixed sleeve.
The acoustic measurement sensors are provided in three.
And the positioning disc is provided with screws and is fixed on the surface of the material to be measured through the screws.
And the bottom of the positioning disc is provided with a sealing material, and the sealing material is used for sealing the positioning disc and the surface of the material to be detected.
The telescopic sleeve comprises pipe barrels with different pipe diameters, the pipe barrel with the large diameter is sleeved outside the pipe barrel with the small diameter, a positioning groove is formed in the outer wall of the pipe barrel, a positioning block is formed in the inner wall of the pipe barrel, the positioning block on the pipe barrel on the outer side is limited in the positioning groove of the pipe barrel on the inner side, and the positioning block moves linearly along the positioning groove to achieve the telescopic function.
The acoustic measurement sensor is a PCB sensor.
The sealing material is a polytetrafluoroethylene composite gasket.
The telescopic supporting rod comprises supporting rods with different diameters, a guide rail and a positioning hole are formed in each supporting rod, and the two connected supporting rods perform linear motion through the guide rail and are inserted into the positioning holes through bolts to achieve telescopic supporting rod stretching.
The top end of the telescopic supporting rod is connected with the loudspeaker through a support.
The positioning disc, the fixed sleeve, the telescopic sleeve and the telescopic support rod are made of aluminum alloy 101A.
Compared with the prior art, the beneficial effects of the utility model are that: two telescoping devices in the acoustic impedance tube can be convenient for users to adjust the length of different devices to correspond different frequency to-be-measured materials, and the portability of the acoustic impedance tube is improved.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of the telescopic tube connection of the present invention;
fig. 3 is a schematic view of the structure of the telescopic strut of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
As shown in fig. 1, an acoustic impedance tube includes an impedance tube, a positioning plate 1 and a telescopic strut 7, the impedance tube includes a fixed sleeve 4 and a telescopic sleeve 5, a speaker 6 is disposed at the top of the telescopic sleeve 5, the bottom of the telescopic sleeve 5 is inserted into the top of the fixed sleeve 4, an acoustic measurement sensor 3 is disposed on the wall of the fixed sleeve 4, the positioning plate 1 is mounted at the bottom of the fixed sleeve 4, the positioning plate 1 is used for fixing the acoustic impedance tube on the surface of a material to be measured, and the top end of the telescopic strut 7 is connected with the speaker 6 through a support for adjusting the overall height of the impedance tube.
The acoustic measuring sensor 3 is arranged perpendicular to the wall of the retaining sleeve 4.
The acoustic measurement sensors 3 are provided in three.
The positioning plate 1 is provided with a screw 2, and the positioning plate 1 is fixed on the surface of the material to be measured through the screw 2.
And the bottom of the positioning disk 1 is provided with a sealing material, and the sealing material is used for sealing the positioning disk 1 and the surface of the material to be detected.
The telescopic sleeve 5 comprises pipe barrels with different pipe diameters, the pipe barrel with the large diameter is sleeved outside the pipe barrel with the small diameter, a positioning groove 9 is formed in the outer wall of the pipe barrel, a positioning block 8 is formed in the inner wall of the pipe barrel, the positioning block 8 on the pipe barrel on the outer side is limited in the positioning groove 9 of the pipe barrel on the inner side, and the positioning block 8 moves linearly along the positioning groove 9 to achieve the telescopic function.
The acoustic measurement sensor 3 is a PCB sensor.
The sealing material is a polytetrafluoroethylene composite gasket.
The telescopic supporting rod 7 comprises supporting rods with different diameters, a guide rail 11 and a positioning hole 10 are formed in each supporting rod, and the two connected supporting rods perform linear motion through the guide rail 11 and are inserted into the positioning hole 10 through a bolt 12 to achieve the telescopic effect of the telescopic supporting rod 7.
The top end of the telescopic strut 7 is connected with the loudspeaker 6 through a bracket.
The positioning plate 1, the fixed sleeve 4, the telescopic sleeve 5 and the telescopic support rod 7 are made of aluminum alloy 101A.
In one possible embodiment, the sound absorption coefficient of the rubber track is measured, the impedance tube base 1 is vertically placed at the position to be measured of the rubber track to be measured, and the sound absorption coefficient and the acoustic impedance acoustics measurement part 2 in the impedance tube are measured according to the national standard GB/T18696.2-2002: transfer function method and ISO 10534-2: 1998, the resistance tube telescopic stay 7 is adjusted to a suitable length by positioning the hole 10, the guide rail 11, and the pin 12, which are required in the sound absorption system of various materials such as general construction sound-absorbing materials, automobile interior materials, industrial sound-absorbing materials, and the like. At the moment, the telescopic sleeve of the impedance tube main body automatically extends and matches the corresponding length under the action of the gravity of the telescopic sleeve.
And (3) connecting the acoustic sensor 3 to a special impedance tube measuring system for debugging, and playing the sound waves with different frequencies required by the test according to the requirements by using the loudspeaker 6 after the debugging is finished. And adjusting the lengths of the corresponding different impedance tube main bodies under different frequencies, thereby measuring the sound absorption coefficients of the material to be measured under different frequencies.
It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should take the description as a whole, and the technical solutions in the embodiments may be appropriately combined to form other embodiments understood by those skilled in the art.
Claims (10)
1. An acoustic impedance tube, comprising: including impedance pipe, positioning disk (1), telescopic strut (7), the impedance pipe includes fixed casing (4) and telescopic tube (5), and the top of telescopic tube (5) is equipped with speaker (6), and the top of fixed casing (4) is inserted to the bottom of telescopic tube (5), is equipped with acoustics measuring sensor (3) on the pipe wall of fixed casing (4), and the bottom in fixed casing (4) is installed in positioning disk (1), positioning disk (1) are used for fixing acoustics impedance pipe on being surveyed the material surface, and the top of telescopic strut (7) is passed through the support and is connected with speaker (6) for adjust impedance pipe overall height.
2. Acoustic impedance tube according to claim 1, characterized in that the acoustic measuring transducer (3) is arranged perpendicular to the tube wall of the retaining sleeve (4).
3. The acoustic impedance tube according to claim 1, characterized in that the acoustic measurement sensor (3) is provided with three.
4. The acoustic impedance tube according to claim 1, characterized in that the positioning disc (1) is provided with screws (2), and the positioning disc (1) is fixed on the surface of the material to be measured through the screws (2).
5. Acoustic impedance tube according to claim 1, characterized in that the bottom of the puck (1) is provided with a sealing material for sealing the puck (1) to the surface of the material to be measured.
6. The acoustic impedance tube according to claim 1, wherein the telescopic tube (5) comprises tube barrels with different tube diameters, tube barrels with large diameters are sleeved outside the tube barrels with small diameters, positioning grooves (9) are formed in the outer wall of the tube barrels, positioning blocks (8) are formed in the inner wall of the tube barrels, the positioning blocks (8) on the outer tube barrels are limited in the positioning grooves (9) of the inner tube barrels, and the positioning blocks (8) perform linear motion along the positioning grooves (9) to achieve a telescopic function.
7. Acoustic impedance tube according to any one of claims 1-6, characterized in that the acoustic measurement sensor (3) is a PCB sensor.
8. The acoustic impedance tube of claim 5, wherein the sealing material is a polytetrafluoroethylene composite gasket.
9. The acoustic impedance tube according to claim 1, wherein the telescopic struts (7) comprise struts with different diameters, a guide rail (11) and a positioning hole (10) are formed in the struts, and two connected struts perform linear motion through the guide rail (11) and are inserted into the positioning hole (10) through a plug pin (12) to realize the telescopic motion of the telescopic struts (7).
10. Acoustic impedance tube according to claim 1, characterized in that the material of the positioning plate (1), the fixing sleeve (4), the telescopic sleeve (5) and the telescopic strut (7) is aluminium alloy 101A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020678067.1U CN212083331U (en) | 2020-04-28 | 2020-04-28 | Acoustic impedance tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020678067.1U CN212083331U (en) | 2020-04-28 | 2020-04-28 | Acoustic impedance tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212083331U true CN212083331U (en) | 2020-12-04 |
Family
ID=73592661
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020678067.1U Active CN212083331U (en) | 2020-04-28 | 2020-04-28 | Acoustic impedance tube |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212083331U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111487324A (en) * | 2020-04-28 | 2020-08-04 | 国网湖北省电力有限公司电力科学研究院 | Acoustic impedance tube |
-
2020
- 2020-04-28 CN CN202020678067.1U patent/CN212083331U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111487324A (en) * | 2020-04-28 | 2020-08-04 | 国网湖北省电力有限公司电力科学研究院 | Acoustic impedance tube |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Navacerrada et al. | Thermal and acoustic properties of aluminium foams manufactured by the infiltration process | |
| CN212083331U (en) | Acoustic impedance tube | |
| CN208888187U (en) | A kind of plate sound-insulation capability measuring device | |
| CN105784096A (en) | Measurement system and measurement method for jet noise of water filling pipe | |
| CN111044615A (en) | Sound insulation performance analysis method, device and system of sound insulation structure and storage medium | |
| CN111189928A (en) | Sound insulation measuring device and method for measuring plate-shaped component in reverberation sound insulation pool | |
| CN102426035B (en) | Method for testing static flow resistivity and tortuosity of porous sound-absorbing material | |
| CN113074809A (en) | Microphone array frame for measuring noise of electric vehicle motor system | |
| CN111487324A (en) | Acoustic impedance tube | |
| Pispola et al. | Transmission loss measurement of consolidated granular media (L) | |
| CN104614445A (en) | Sound velocity measuring device based on seafloor sediments | |
| CN104457970B (en) | A kind of half silencer box of broadband measurement | |
| CN110530602A (en) | A kind of Combined microphone array apparatus | |
| Labašová et al. | Measurement of the acoustic absorption Coefficient by impedance tube | |
| CN214373853U (en) | Hardness detection device for stainless steel pipe fitting | |
| CN211426383U (en) | Standing wave tube sound absorption system determination experimental equipment | |
| CN207636541U (en) | Sound wave oblique incidence material acoustic absorptivity and sound insulation measuring device | |
| CN205317728U (en) | It shakes to detect and uses support to be applicable to extra -high voltage insulator sound | |
| CN208094799U (en) | Loudspeaker vibration component materials viscoelasticity measurement system | |
| CN212007516U (en) | Noise pollution's environmental protection testing arrangement | |
| CN207231626U (en) | A kind of test system of sound proof box and the application sound proof box | |
| CN216815374U (en) | Portable floor thickness measuring instrument | |
| CN219456050U (en) | Irregular incidence sound absorption coefficient test equipment for small-size materials | |
| CN204649696U (en) | Acoustical absorption coefficient on-site detecting device | |
| CN218003379U (en) | Indoor air detection device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |