CN108535363A - A kind of sample clamp for the sound absorption test of acoustic impedance pipe - Google Patents
A kind of sample clamp for the sound absorption test of acoustic impedance pipe Download PDFInfo
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- CN108535363A CN108535363A CN201810135879.9A CN201810135879A CN108535363A CN 108535363 A CN108535363 A CN 108535363A CN 201810135879 A CN201810135879 A CN 201810135879A CN 108535363 A CN108535363 A CN 108535363A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
- G01B21/08—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness for measuring thickness
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Abstract
The present invention relates to a kind of sample clamps for the sound absorption test of acoustic impedance pipe comprising：Test specimen cylinder (101), digital scale (102), digital display bearing (103), numerical display device (104), moveable piston (107) and handle (105)；One end of digital scale (102) is connect by attachment device with moveable piston (107), the digital scale (102) that moveable piston (107) will be connected with is inserted into test specimen cylinder (101), and the other end end of digital scale (102) is connected with handle (105)；The rear sight base (103) is located between test specimen cylinder (101) and handle (105), and is fixed on by fixing device the end of one end of test specimen cylinder (101)；The numerical display device (104) is fixed on digital display bearing (103)；Sample to be tested (110) is placed in one end end of test specimen cylinder (101), and sample to be tested (110) is flushed with the end end, moveable piston (107) can reserve spacing between sample to be tested, form air layer.
Description
Technical field
The invention belongs to sound-absorbing material or the acoustical testing technical fields of structure, and in particular to one kind is inhaled for acoustic impedance pipe
The sample clamp of sound test.
Background technology
Acoustic impedance pipe is a kind of standard test equipment for testing small size sound-absorbing material or structure normal direction sound absorbing performance,
In the theoretical research and product design of sound-absorbing material or structure, acoustic impedance pipe is a kind of general and essential test dress
It sets, is widely used.The basic test principle and basic structure of acoustic impedance pipe can refer to《18696.2 acoustic impedances of GB/T
The measurement part 2 of acoustic absorptivity and acoustic impedance in pipe：Transfer function method》.
In acoustic impedance pipe, a sample clamp is needed, clamping sample to be tested is used for, sample to be tested is wanted by testing standard
It asks and installs, and connect the test pipeline equipped with microphone and sound source, to test normal direction of the sample to be tested under corresponding conditions
Surface acoustic impedance and acoustic absorptivity.As shown in Figure 1, existing sample clamp 1 and test pipeline section 2 link together, existing fixture
Sample to be tested 5 be located in existing sample clamp 1, can there are the air layers of given thickness between piston 6 and sample to be tested 5；
Two microphones 3 have been mounted flush in the side wall of test pipeline section, and loud speaker 4 is installed in the end of test pipeline section, as sound source.
Testing sound-absorbing material or when structure, such as perforated plate or porous material, it often need to there are certain thickness skies after sample to be tested
Gas-bearing formation carries out to improve low frequency absorption performance studying and a series of air layer thickness conditions in design process, being often arranged
Therefore test is equipped with moveable piston in sample clamp, in this way by the moveable piston come change after sample to be tested there are
Air layer thickness.For sound-absorbing material or structure, the air layer thickness after material or structure can significantly affect its sound absorption
Performance, if the air layer thickness being arranged when absorbing sound and testing is inaccurate, test result will be with corresponding ideal air layer thickness
Under the conditions of result between there are notable differences, thus very big obstruction can be brought to the research and design of sound-absorbing material or structure.
Currently, the normal reference mark on the pull rod being connect with moveable piston of existing acoustic impedance pipe sample clamp, passes through
The front and back correspondence scale difference on pull rod at pipe end External Reference position of piston movement is read, required air layer is obtained
Thickness；Or scale value when moveable piston surface and sample contact on pull rod at pipe end External Reference position is first read,
As a reference value；Further according to required air layer thickness, the scale value corresponding to the air layer thickness value is found, and in pull rod
On make corresponding label, then pull pull rod that corresponding scale value is made to be located at the mark outside acoustic impedance pipe end again.But
Usually scale precision of the label on pull rod is relatively low, generally Centimeter Level；In addition, reading position scale or the required sky of setting
Gas pay thickness is also relatively complicated to be taken, existing especially for test of multiple samples to be tested under multiple air layer thicknesses
Sample clamp haves the shortcomings that positioning accuracy is low, operating efficiency is low.
Invention content
It is an object of the present invention to be asked there are above-mentioned to solve the existing sample clamp for the sound absorption test of acoustic impedance pipe
Topic, the present invention provides a kind of sample clamps for the sound absorption test of acoustic impedance pipe, and digital scale is matched with moveable piston
It closes and uses, the thickness for quick and precisely setting the cavity between sample to be tested and moveable piston may be implemented, while can also be true
The thickness for determining sample to be tested, is remarkably improved measuring accuracy and testing efficiency.
The sample clamp includes：Test specimen cylinder, digital scale, digital display bearing, numerical display device, moveable piston and
Handle；
The test specimen cylinder is hollow tubular structure；One end of digital scale is connected by attachment device and moveable piston
It connecing, the digital scale for being connected with moveable piston is inserted into test specimen cylinder, the other end of digital scale passes through rear sight base, and
Its other end end is connected with handle；The rear sight base is fixed on examination between test specimen cylinder and handle, and by fixing device
The end of one end of part cylinder；The numerical display device is fixed on digital display bearing, the digital scale relative movement of real-time display
Displacement, i.e., piston relative movement displacement；Sample to be tested is placed in one end of test specimen cylinder, and sample to be tested and the end end
It flushes, spacing can be reserved between moveable piston and sample to be tested, form air layer.
In the above-mentioned technical solutions, the moveable piston in tubular construction, and with test specimen cylinder coordinate, moveable piston
One end is plane, and the other end is equipped with the location structure perpendicular to the end end, for fixing digital scale, location structure
Be equipped with location hole, digital scale is fixedly connected with moveable piston by screw, with ensure digital scale with it is removable
The other end vertical connection of piston.
In the above-mentioned technical solutions, numerical display device is digital display or numeric display unit.
In the above-mentioned technical solutions, the numeric display unit includes：Number shows sub-device and data storage device；Institute
It states number and shows that sub-device is connect by client cables with data storage device, by the relative displacement data of digital tape measure
Data storage device is transmitted to be stored.
In the above-mentioned technical solutions, using capacitance-grid type principle or raster pattern principle or magnetic-grid-type principle, respectively digital
Fixed grid and moving grid are accordingly installed in the outer surface of scale and the inside of numerical display device, can be in moveable piston in test specimen cylinder
It is reset when mobile any position, with the distance that real-time display piston relatively moves, realizes the accurate measurement of relative displacement.Number is aobvious
Show that the resolution ratio of equipment is 0.001~0.1 millimeter.
In the above-mentioned technical solutions, the outside of moveable piston is equipped with several sealing rings or sealing strip, removable for preventing
Piston gas leakage when moving.
In the above-mentioned technical solutions, the end of digital display bearing or test specimen cylinder is provided with relief hole, for reducing moveable piston
When moving due to compressing or expanding the additional friction of generation.
In the above-mentioned technical solutions, the distance of moveable piston movement and the numerical value that numerical display device is shown are an a pair
It answers.
In the above-mentioned technical solutions, the sample to be tested is blocky sound-absorbing material or flat sound-absorbing material etc..
Sample to be tested is put into test specimen cylinder one end, pushes sample to be tested up to one end of sample to be tested using moveable piston
End face and test specimen cylinder one end end face, as reference plane position；At this point, the conduct of the location of sample to be tested
Reference position, the location of the moveable piston being close to sample to be tested another side are set as initial position, will accordingly count
Word shows that the number shown in equipment is reset；Test specimen cylinder is connect with the test pipeline section of acoustic impedance pipe by modes such as slip-knots again；
According to the air layer thickness of required setting, digital scale is pulled or pushed by handle, and then moveable piston is driven to move
It is dynamic, when the numerical value that numerical display device is shown is equal to required air layer thickness, stop mobile moveable piston, then carry out
Subsequent sound absorption test.It therefore, can quick, accurate setting air layer thickness by above-mentioned sample clamp.
In addition, before being put into sample to be tested, the front surface of moveable piston is moved to the end face of test specimen cylinder one end, that is, is joined
Face position is examined, numerical display device reset button is pressed, the number which shows is reset, this position is set as zero
Point, install sample to be tested after, pull out detected materials sample using moveable piston, by the front surface of sample to be tested adjust to
Reference plane position flushes, and at this moment, the relative distance of moveable piston movement is the thickness of sample to be tested.
The advantage of the invention is that：
The present invention have many advantages, such as positioning accuracy it is high, it is easy to operate and can simultaneously test material thickness of sample, can significantly carry
High measuring accuracy and testing efficiency.In addition, the total very simple of the present invention, and cost is cheap, has very strong
Practicability.
Description of the drawings
Fig. 1 is a kind of structural schematic diagram that existing sample clamp is connect with acoustic impedance pipe；
Fig. 2 is a kind of structural schematic diagram of sample clamp for the sound absorption test of acoustic impedance pipe of the present invention；
Fig. 3 is that a kind of structure of the sample clamp of the specific implementation for the sound absorption test of acoustic impedance pipe of the present invention is shown
It is intended to；
Fig. 4 is the sectional view of the sample clamp of a specific embodiment of Fig. 3.
Reference numeral：
1, existing sample clamp 2, test pipeline section
3, microphone 4, loud speaker
5, sample to be tested 6, the piston of existing fixture
101, test specimen cylinder 102, digital scale
103, digital display bearing 104, numerical display device
105, handle 106, sealing ring
107, moveable piston 108, connection external screw thread
109, location structure 110, sample to be tested
111, relief hole
Specific implementation mode
As shown in Fig. 2, the present invention provides a kind of sample clamp for the sound absorption test of acoustic impedance pipe, can be efficiently modified
With the presence of sample clamp the shortcomings that, be remarkably improved the setting accuracy of air layer thickness and easy to operate, structure letter after sample
It is single, there is good practicability.By the suitably modified of interface form, sample clamp of the invention can be replaced existing in the market
Impedance tube sample clamp, so that it is had digital display function.
As shown in Fig. 2, the present invention provides it is a kind of for acoustic impedance pipe sound absorption test sample clamp, using with it is digital
The thickness for accurately setting the cavity between sample to be tested and digital display bearing may be implemented, i.e., in the moveable piston that scale is connected
The thickness of air layer, while can also quickly determine the thickness of sample to be tested；In addition, being remarkably improved sample to be tested and moving
The setting accuracy of air layer thickness between piston, and setting process is convenient and efficient, can also effectively improve sample to be tested in difference
The testing efficiency of sound absorbing performance under air layer thickness.
As shown in Fig. 2, the sample clamp includes：Test specimen cylinder 101, digital scale 102, digital display bearing 103, number are aobvious
Show equipment 104, moveable piston 107 and handle 105；The test specimen cylinder 101 is hollow tubular structure；As shown in Fig. 2, digital
The left end of formula scale 102 is connect by attachment device with moveable piston 107, and the digital of moveable piston 107 will be connected with
Scale 102 is inserted into test specimen cylinder 101, and the right end of digital scale 102 passes through digital display bearing 103, and its right end end and handle
105 connections；The digital display bearing 103 is located between the outside and handle 105 of test specimen cylinder 101, and is fixed on by fixing device
The end of the right end of test specimen cylinder 101；The numerical display device 104 is fixed on digital display bearing 103, the digital mark of real-time display
The displacement of ruler relative movement, the i.e. displacement of piston relative movement；Sample to be tested 110 is placed in the left end end of test specimen cylinder 101,
And sample to be tested 110 is flushed with the left end end of the test specimen cylinder 101, is reserved between moveable piston 107 and sample to be tested 110
Spacing forms air layer.
In the above-mentioned technical solutions, as shown in Fig. 2, the left end of moveable piston 107 be plane, right end be equipped with perpendicular to
The location structure 109 of the end, the location structure 109 are equipped with location hole, by the left end of digital scale 102 and are somebody's turn to do by screw
Location structure 109 is fixedly connected, and to ensure the right end vertical connection of digital scale 102 and moveable piston 107, and then making can
Mobile piston 107 is stretched or is pushed in the horizontal direction.
In the above-mentioned technical solutions, as shown in Fig. 2, the outer wall of the moveable piston 107 equipped with several sealing rings 106 or
Sealing strip reduces test error for preventing the gas leakage when moving of moveable piston 107.
In the above-mentioned technical solutions, numerical display device 104 is digital display or numeric display unit.
In the above-mentioned technical solutions, the numeric display unit includes：Number shows sub-device and data storage device；Institute
State number and show that sub-device connect by client cables with data storage device, by digital display sub-device show by number
Relative displacement data transmission to the data storage device of formula tape measure is stored；The data are stored by client cables again
Equipment is connect with user terminal, convenient to handle data.Wherein, the user terminal can be personal computer.
In the above-mentioned technical solutions, using capacitance-grid type principle or raster pattern principle or magnetic-grid-type principle, respectively digital
Fixed grid and moving grid are accordingly installed in the outer surface of scale 102 and the inside of numerical display device 104, can be in moveable piston 107
It is reset when mobile any position in test specimen cylinder 101, with the distance that real-time display moveable piston 107 relatively moves, realizes phase
Accurate measurement to displacement.The resolution ratio of numerical display device 104 is 0.001~0.1 millimeter.
In the above-mentioned technical solutions, the right end end of digital display bearing 103 or test specimen cylinder 101 is provided with relief hole 111, for subtracting
Few moveable piston 107 is when moving due to compressing or expanding the additional friction of generation.
In the above-mentioned technical solutions, the moveable piston 107 is made of the good material of the big rigidity of quality, it is preferable that
It is made of the stainless steel or duralumin material of 2-3cm thickness.
In the above-mentioned technical solutions, the numerical value that is shown with numerical display device 104 of distance that moveable piston 107 moves is
Correspondingly.
In the above-mentioned technical solutions, the sample to be tested 110 is blocky sound-absorbing material or flat sound-absorbing material.
Sample to be tested is put into the left end of test specimen cylinder 101, and Chong Die with the transverse plane at the end, at this point, residing for sample to be tested
Position as reference position, the location of moveable piston 107 is set as initial position, corresponding numerical display device 104
The number of upper display is reset；Again by the connection external screw thread 108 of test specimen cylinder 101 by the testing tube of test specimen cylinder 101 and acoustic impedance pipe
Section connection；According to required air layer thickness, digital scale 102 is pulled or pushed by handle 105, and then drive removable
Piston 107 moves, and when the numerical value that numerical display device 104 is shown is equal to required air layer thickness, stopping movement can
Mobile piston 107, then carry out subsequent sound absorption test.It therefore, can quick, accurate setting air by above-mentioned sample clamp
Layer thickness.
Sample to be tested can be board-like sound-absorbing material or bulk material or the sound absorption structure etc. that the two is combined into.Tool
Body is in use, when sample to be tested is board-like sound absorption structure, such as perforated plate places it in the test of 101 harmony impedance tube of test specimen cylinder
Between pipeline section, test specimen cylinder 101 and testing tube are connected by attachment device and locked, while the periphery of board-like sound-absorbing material being carried out
It is fixed.When sample to be tested 110 is blocky sound-absorbing material, which is placed in test specimen cylinder when test by such as porous material
In 101, by the movement of moveable piston 107, by blocky sound-absorbing material towards adjusted on one side to test specimen cylinder outside test specimen cylinder 101
101 nozzle, and flushed with nozzle, to be accurately positioned and be accurately obtained surface acoustic impedance coefficient.
As shown in Fig. 2, sample to be tested 110 to be put into the left end of test specimen cylinder 101, pushed to the left using moveable piston 107
Sample to be tested 110 is up to the end face of the end face of the left end of sample to be tested 110 and the left end of test specimen cylinder 101, i.e. reference plane position, together
It is flat；At this point, the location of sample to be tested 110 is used as reference position, the moveable piston being close to the right side of sample to be tested 110
The location of 107 are set as initial position, accordingly reset the number shown on numerical display device 104；Again by test specimen
Cylinder 101 is connect with the test pipeline section of acoustic impedance pipe by slip-knot；According to the air layer thickness of required setting, pass through handle 105
Digital scale 102 is pulled or pushed, and then moveable piston 107 is driven to move, when the numerical value that numerical display device 104 is shown
When equal to required air layer thickness, stop mobile moveable piston 107, then carries out subsequent sound absorption test.Therefore, pass through
Above-mentioned sample clamp, can quick, accurate setting air layer thickness.
In addition, as shown in Fig. 2, before being put into sample to be tested 110, the left surface of moveable piston 107 is moved to test specimen
The end face of the left end of cylinder 101, i.e. reference plane position, press 104 reset button of numerical display device, which are shown
Number reset, this position is set as zero, after sample to be tested 110 is installed, is pulled to the right using moveable piston 107 and waits for test sample
The left surface of sample to be tested 110 is adjusted to reference plane position and is flushed by product 110, at this moment, the phase that moveable piston 107 moves
It adjusts the distance as the thickness of sample to be tested 110.
In other specific implementations, as shown in Figures 3 and 4, in the intrinsic connection external screw thread 108 of the left end of test specimen cylinder, and with
Test specimen cylinder is integrally formed；It is used to connect the left end of test specimen cylinder 101 simultaneously with test pipeline section by slip-knot in the connection external screw thread 108
It is fixed.
In other specific embodiments, the numerical display device 104 can also be detached with test specimen cylinder 101, be not arranged in
On test specimen cylinder 101, digital scale 102 is connect with numerical display device 104 by data line, digital scale 102 moves
Distance corresponding numerical value can be shown on numerical display device 104.
It should be noted last that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting.Although ginseng
It is described the invention in detail according to embodiment, it will be understood by those of ordinary skill in the art that, to the technical side of the present invention
Case is modified or replaced equivalently, and without departure from the spirit and scope of technical solution of the present invention, should all be covered in the present invention
Right in.
Claims (7)
1. a kind of sample clamp for the sound absorption test of acoustic impedance pipe, which is characterized in that the sample clamp includes：
Test specimen cylinder (101), digital scale (102), digital display bearing (103), numerical display device (104), moveable piston
(107) and handle (105)；
The test specimen cylinder (101) is hollow tubular structure；One end of digital scale (102) is by attachment device and moves
Piston (107) connects, and the digital scale (102) for being connected with moveable piston (107) is inserted into test specimen cylinder (101), number
The other end of formula scale (102) passes through rear sight base (103), and its other end end is connected with handle (105)；The rear sight base
(103) between test specimen cylinder (101) and handle (105), and it is fixed on by fixing device the end of one end of test specimen cylinder (101)
Portion；The numerical display device (104) is fixed on digital display bearing (103), the position of the digital scale relative movement of real-time display
It moves.
2. sample clamp according to claim 1, which is characterized in that the moveable piston (107) is in the form of a column structure, and
Coordinate with test specimen cylinder, one end of moveable piston (107) is plane, and the other end is equipped with the location structure perpendicular to the end end
(109), it is used for digital scale (102) are fixed, location structure (109) is equipped with location hole, by screw by digital mark
Ruler (102) is fixedly connected with moveable piston (107).
3. sample clamp according to claim 1, which is characterized in that numerical display device is that digital display or number are aobvious
Showing device.
4. sample clamp according to claim 3, which is characterized in that the numeric display unit includes：Number display
Device and data storage device；The number shows that sub-device is connect by client cables with data storage device, will be digital
Relative displacement data transmission to the data storage device of tape measure is stored.
5. sample clamp according to claim 2, which is characterized in that utilize capacitance-grid type principle or raster pattern principle or magnetic grid
Formula principle, respectively the inside of the outer surface of digital scale (102) and numerical display device (104) accordingly install fixed grid and
Moving grid is reset when moveable piston is in mobile any position in test specimen cylinder, real with the distance that real-time display piston relatively moves
The accurate measurement of existing relative displacement；The resolution ratio of numerical display device (104) is 0.001~0.1 millimeter.
6. sample clamp according to claim 1, which is characterized in that the outer surface of moveable piston (107) is equipped with several
Sealing ring (106) or sealing strip, for preventing moveable piston (107) gas leakage when moving.
7. sample clamp according to claim 1, which is characterized in that the end of digital display bearing (103) or test specimen cylinder (101)
It is provided with relief hole (111), for reducing moveable piston when moving due to compressing or expanding the additional friction of generation.
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| CN201810135879.9A CN108535363A (en) | 2018-02-09 | 2018-02-09 | A kind of sample clamp for the sound absorption test of acoustic impedance pipe |
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|---|---|---|---|
| CN201810135879.9A CN108535363A (en) | 2018-02-09 | 2018-02-09 | A kind of sample clamp for the sound absorption test of acoustic impedance pipe |
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| CN110057335A (en) * | 2019-04-03 | 2019-07-26 | 东华大学 | A method of air layer thickness under measurement clothes clothing |
| RU2730041C1 (en) * | 2020-01-27 | 2020-08-14 | федеральное государственное бюджетное образовательное учреждение высшего образования "Пермский национальный исследовательский политехнический университет" | Acoustic interferometer |
| RU2756352C2 (en) * | 2020-01-16 | 2021-09-29 | Федеральное Государственное Унитарное Предприятие "Всероссийский Научно-Исследовательский Институт Физико-Технических И Радиотехнических Измерений" (Фгуп "Вниифтри") | Method for measuring coefficient of sound reflection from material sample |
| CN114414664A (en) * | 2022-01-08 | 2022-04-29 | 西北工业大学 | Sound absorption coefficient testing device and method based on embedded control system and short sound tube |
| CN114878699A (en) * | 2022-04-26 | 2022-08-09 | 哈尔滨工程大学 | Acoustic impedance tube acoustic performance test auxiliary test device |
| RU2815543C1 (en) * | 2024-01-23 | 2024-03-18 | Федеральное государственное автономное образовательное учреждение высшего образования "Сибирский федеральный университет" (СФУ) | Device for measuring sound insulation of panels against air noise |
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