CN102095466B - Volume measurement method based on sound generating principle of piston - Google Patents
Volume measurement method based on sound generating principle of piston Download PDFInfo
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- CN102095466B CN102095466B CN 201010559519 CN201010559519A CN102095466B CN 102095466 B CN102095466 B CN 102095466B CN 201010559519 CN201010559519 CN 201010559519 CN 201010559519 A CN201010559519 A CN 201010559519A CN 102095466 B CN102095466 B CN 102095466B
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Abstract
The invention belongs to the experiment testing technique, and relates to a volume measurement method based on the sound generating principle of a piston. A pistonphone is excited to work by the fixed frequency of 1 to 200 Hz, and a microphone is used for measuring the sound pressure in a cavity to be measured; the pistonphone is driven by a displacement mechanism to change the volume of the cavity to be measured; a displacement sensor is used for measuring the displacement of the pistonphone to obtain the change amount of the volume, and the sound pressure of the pistonphone in the cavity to be measured is measured for the second time; the above operations are carried out twice or more to obtain the known change amount of the volume (deltaVi) sequence and the corresponding sound pressure measurement values (pi) sequence; and the deltaVi and the sequence group are processed by least squares fitting to obtain the slope (a) and the intercept (b), and the total volume of the cavity to be measured can be calculated based on the slope and the intercept. Based on the principle that the magnitude of the sound pressure generated by the pistonphone is in inverse proportion to the internal volume of the cavity, the method can calculate the volume of the cavity by intentionally changing the volume to the known values and measuring the sound pressures generated by the pistonphone corresponding to different volumes.
Description
Technical field
The invention belongs to the experimental test technology, relate to a kind of volumetric measurement method based on piston sounding principle.
Background technology
The method of general length is measured powerless for irregular cavity volume; People's method of having designed various indirect measurements is applicable to that irregular cavity volume measures for this reason; Like water filling weight method, static pressure plavini or the like; These methods are all based on static measurement, and the leakproofness of cavity volume is had very high requirement.
Summary of the invention
The objective of the invention is to propose a kind ofly to solve those and have irregularly shaped and do not have the volumetric measurement method based on piston sounding principle of problems of measurement of the cavity volume of complete sealing.
Technical scheme of the present invention is: pistonphone is installed on the tested cavity volume, and pistonphone is worked down in the fixed frequency of 1～200Hz and excitation, measures the acoustic pressure in the tested cavity volume with microphone; Drive the volume that pistonphone changes tested cavity volume through displacement mechanism, the displacement of displacement sensor pistonphone obtains volume change amount, and the acoustic pressure that once more pistonphone is produced in tested cavity volume is measured; Carry out twice or repeatedly above operation, obtain known volume change amount Δ V
iSequence and corresponding sound pressure measurement value p
iSequence; To Δ V
iWith
Sequence set is carried out least square fitting and is obtained slope a and intercept b, and by
Calculate the total measurement (volume) of tested cavity volume.
Described pistonphone through piston according to the fixed frequency sinusoidal motion repeatedly the compression square-cavity air produce acoustic pressure, the amplitude of the moving displacement of its piston is consistent.
The acoustic pressure frequency that described pistonphone produced immobilizes in each measuring process.
Tested cavity volume is complete when airtight, on piston or other position, offers balancing orifice, when guaranteeing under the different volume conditions test in the chamber mean pressure all consistent with atmospheric pressure.
Under each volume conditions, carry out repeatedly sound pressure measurement and average to reduce the stochastic error that noise etc. causes.
Major advantage of the present invention is: the acoustic pressure size that the present invention utilizes pistonphone to produce is inversely proportional to the cavity volume internal volume; That has a mind to carries out the change of known dimensions to volume; Not measuring the acoustic pressure that pistonphone produces under the co-content situation, just can calculate the size of volume own.And influences such as leakage all are the same in the experiment of co-content not, will be eliminated during this influence is in the end calculated.The present invention can measure irregular cavity volume, and sealing is not had special requirement, and is applied widely.
Description of drawings
Fig. 1 is a principle of the invention synoptic diagram.
Embodiment
Use the measuring system of the present invention's technology mainly to form like Fig. 1, it comprises accessory structures such as main composition such as pistonphone 1, microphone 2, displacement adjustment structure 3, precise displacement sensor 4, volume adjustment plunger shaft 5, volume adjustment piston 6, balancing orifice 7 and structure stand, data acquisition and analysis system.
Pistonphone 1 through piston according to the fixed frequency sinusoidal motion repeatedly the compression square-cavity air produce acoustic pressure, preferably customize big amplitude pistonphone, be operated in certain fixed frequency between (1～200) Hz, require to have good repeatability.Acoustic pressure is measured in 2 pairs of chambeies of microphone, uses highly sensitive piezoelectric microphone.Volume adjustment plunger shaft 5 links together with tested cavity volume; Drive volumes adjustment pistons 6 through displacement adjustment structure 3 and move and change volume size, the displacement x that the changing value Δ V of volume is measured by precise displacement sensor 4 and the sectional area S of piston 6 multiply each other and obtain.Like tested cavity volume is airtight cavity volume, then need be provided with in balancing orifice 7 connected chambers and atmosphere, when guaranteeing under the different volume conditions test in the chamber mean pressure all consistent with atmospheric pressure, protect microphone 2 simultaneously in order to avoid damage.
Concrete operations are described as follows:
1), make this moment cavity volume consistent, and establishing at this moment volume, to adjust piston 6 positions be position x at zero point with tested volume through displacement adjustment structure 3 volume adjusted adjustment piston 6 positions
0=0;
2) make pistonphone 1 work, microphone 2 continuous several times are measured the interior acoustic pressure of cavity volume and are averaged and are p
0(Pa);
3) arrive new position through displacement adjustment structure 3 volume adjusted adjustment piston 6, it is x that displacement transducer 4 is measured new position relative zero displacement
1, the changing value Δ V of volume
i=x
iS measures acoustic pressure mean value p once more
1
4) repeat step 3) repeatedly, obtain corresponding Δ V successively
iWith p
i
5) utilize least square method to carry out fitting a straight line to sequence set
; Obtaining slope is that a, intercept are b, by the tested total measurement (volume) of computes:
The actual acoustic pressure that produces can receive the structure influence of cavity volume such as air leakage own and produce an amplitude-frequency response relevant with frequency; Measurement result also can receive the influence of microphone dynamic response; But these influences all are the same to the influence of the experiment that carry out the front, and establishing the acoustic pressure that produces under the perfect condition that these influences are carried out obtaining behind the correction-compensation is Ap
i, fitting a straight line obtains slope and does
Intercept does
And calculate tested total measurement (volume) V thus
0Obviously be irrelevant with the A value.
Claims (5)
1. the volumetric measurement method based on piston sounding principle is characterized in that pistonphone is installed on the tested cavity volume, and pistonphone is worked down in the fixed frequency of 1～200Hz and excitation, measures the acoustic pressure in the tested cavity volume with microphone; Drive the volume that pistonphone changes tested cavity volume through displacement mechanism, the displacement of displacement sensor pistonphone obtains volume change amount, and the acoustic pressure that once more pistonphone is produced in tested cavity volume is measured; Carry out twice or repeatedly above operation, obtain known volume change amount Δ V
iSequence and corresponding sound pressure measurement value p
iSequence; To Δ V
iWith
Sequence set is carried out least square fitting and is obtained slope a and intercept b, and by
Calculate the total measurement (volume) of tested cavity volume.
2. by the described volumetric measurement method of claim 1 based on piston sounding principle; It is characterized in that; Described pistonphone through piston according to the fixed frequency sinusoidal motion repeatedly the compression square-cavity air produce acoustic pressure, the amplitude of the moving displacement of its piston is consistent.
3. by the described volumetric measurement method of claim 1, it is characterized in that the acoustic pressure frequency that described pistonphone produced immobilizes in each measuring process based on piston sounding principle.
4. by the described volumetric measurement method of claim 1 based on piston sounding principle; It is characterized in that; Tested cavity volume is complete when airtight, on piston or other position, offers balancing orifice, when guaranteeing under the different volume conditions test in the chamber mean pressure all consistent with atmospheric pressure.
5. by the described volumetric measurement method of claim 1, it is characterized in that, under each volume conditions, carry out repeatedly sound pressure measurement and average to reduce the stochastic error that noise causes based on piston sounding principle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010559519 CN102095466B (en) | 2010-11-26 | 2010-11-26 | Volume measurement method based on sound generating principle of piston |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010559519 CN102095466B (en) | 2010-11-26 | 2010-11-26 | Volume measurement method based on sound generating principle of piston |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102095466A CN102095466A (en) | 2011-06-15 |
| CN102095466B true CN102095466B (en) | 2012-10-17 |
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ID=44128652
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010559519 Active CN102095466B (en) | 2010-11-26 | 2010-11-26 | Volume measurement method based on sound generating principle of piston |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102611982B (en) * | 2012-03-26 | 2014-06-11 | 浙江大学 | Fixture for calibrating microphone |
| GB201207322D0 (en) * | 2012-04-27 | 2012-06-13 | Airbus Uk Ltd | Measuring the volume of fluid in a pressurised vessel |
| CN113099334B (en) * | 2020-01-08 | 2022-09-30 | 北京小米移动软件有限公司 | Configuration parameter determining method and device and earphone |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101000259A (en) * | 2006-12-31 | 2007-07-18 | 合肥工业大学 | Device for measuring volume of engine cylinder head combustion chamber |
| CN101273257A (en) * | 2005-09-29 | 2008-09-24 | 罗斯芒特公司 | Pressure transmitter with acoustic pressure sensor |
-
2010
- 2010-11-26 CN CN 201010559519 patent/CN102095466B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101273257A (en) * | 2005-09-29 | 2008-09-24 | 罗斯芒特公司 | Pressure transmitter with acoustic pressure sensor |
| CN101000259A (en) * | 2006-12-31 | 2007-07-18 | 合肥工业大学 | Device for measuring volume of engine cylinder head combustion chamber |
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| Publication number | Publication date |
|---|---|
| CN102095466A (en) | 2011-06-15 |
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Effective date of registration: 20201223 Address after: 100095, Beijing, Haidian District Hot Springs Village ring Patentee after: Ximeng Electronics International Ltd. Address before: 100095 mailbox 1066, Beijing City Patentee before: Beijing Changcheng Institute of Metrology & Measurement,Aviation Industry Corporation of China |