CN101441125B - Tiny pulsation pressure generator - Google Patents
Tiny pulsation pressure generator Download PDFInfo
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- CN101441125B CN101441125B CN200810240984A CN200810240984A CN101441125B CN 101441125 B CN101441125 B CN 101441125B CN 200810240984 A CN200810240984 A CN 200810240984A CN 200810240984 A CN200810240984 A CN 200810240984A CN 101441125 B CN101441125 B CN 101441125B
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Abstract
The invention belongs to a dynamic pressure calibration technology, relates to a small pulse pressure calibrator which comprises an enclosed cavity, a piston, a vibration table, an isolation table an adjusting spring, wherein the cavity is a positive cylinder cavity, and the diameter of the cavity is equal to the length of the cavity; the piston is arranged between the cavity and the vibration table and fixed on the vibration table; two ends of the vibration table are respectively provided with the isolation table with the cavity arranged thereon, and the coaxiality between the cavity and the piston is adjusted through the adjusting spring. The invention obtains simulative small pulse pressure through the movement of the piston in the enclosed cavity, and couples the small pulse pressure to a diaphragm of a microphone, so as to enable the small pulse pressure sensitivity response to directly associate with the small pulse pressure change sensed by the diaphragm, and the small pulse pressure change is in a range of 1 to 50 Hz which covers the infrasonic, therefore the small pulse pressure microphone calibration is realized.
Description
Technical field
The invention belongs to the dynamic pressure collimation technique, relate to a kind of tiny pulsation pressure generator.
Background technology
The micro-pressure sensor dynamic perfromance is generally poor than the sensor of high range more; All much lower like the frequency response (resonance frequency) of pressure resistance type micro-pressure sensor of the same type than the sensor of high range more; And domesticly now the dynamic calibration of micro-pressure sensor is also lacked effective means, the development of the micro-pressure sensor that is used for dynamic test has all been formed restraining factors with using.And in some fields of Aero-Space, claiming simulates negative pressure measurement environment (mean pressure is lower than atmospheric pressure) and produces value, high-precision fluctuation pressure a little.Therefore the high-precision sinusoidal pressure calibrating installation that works out a kind of minute-pressure pulsation is very valuable and necessary.
The Research on Dynamic Characteristic of dynamic pressure system and the existing certain history of the calibration steps of measuring system research; The U.S. and the USSR (Union of Soviet Socialist Republics) are in nineteen fifties the begin one's study theory and the method for pressure dynamic calibration; The metering security problem of kinetic measurement has been proposed; Dynamic Calibration Technique has caused the attention of scientific and technological circle and industrial sector behind the seventies, has produced a lot of dynamic pressure calibrating installations and corresponding dynamic pressure calibration method.Calibration criterions such as shock tube, intermediate frequency sinusoidal signal generator have been developed in succession for domestic 304; Emphasis has solved the indoor dynamic calibration problem of pressure transducer; But pressure limit is (0～2) Mpa, and the amplitude uncertainty is 5%, and the pulsation amplitude is all than higher; And can not simulate the environment that negative pressure is measured; Can not well realize dynamic calibration, mainly come simple the assurance at present, in fact can not confirm the actual measurement precision of this system through introducing external high-frequency pressure sensor and static calibration to small pulsation amplitude pressure-measuring systems such as aeromotor inlet distortion pressure.Abroad necessarily made progress early existing aspect the development of engine dynamic pressure calibration application specific standard in recent years; There is the Russian CIAM experiment of report base to succeed in developing and can be used for the у з с д specialized equipment that on-the-spot engine pressure is measured the calibration of channel transition characteristic; The actual conditions that can simulated engine transition state pressure change; Measuring system is carried out field calibration, but domesticly also do not see similar special-purpose dynamic pressure calibrating installation.
The device of simulated pressure distortion has multiplely in the aeromotor test, like simulation net, analog board, plate flow spoiler and jet distortion generator etc., but also lacks the method and apparatus that pressure transducer that pressure distortion is tested carries out dynamic calibration at home.
Common commercial piston type tiny pulsation pressure calibrating device is driven two pistons and in little cavity, is produced sinusoidal tiny pulsation pressure and be coupled to the calibration that microphone is realized microphone by the driven by motor cam.Be mainly used in the calibration of work level microphone.The tiny pulsation pressure size that produces depends on the physical dimension of cam, and precision is lower.Its frequency ratio more single (250Hz or 1KHz), the tiny pulsation pressure level is generally 124dB, and uncertainty is 0.2dB, and its frequency range can not cover infrasonic sound.
Summary of the invention
The purpose of this invention is to provide and a kind ofly can cover 1Hz～500Hz infrasonic sound tiny pulsation pressure generator.Technical scheme of the present invention is, tiny pulsation pressure generator comprises cavity, piston, shaking table, vibration isolation table and the regulating spring of sealing, and cavity is positive cylindrical cavity, the diameter of cavity and the equal in length of cavity; Piston places between cavity and the shaking table and is fixed on the shaking table; The two ends of shaking table respectively are provided with a vibration isolation table, and cavity is installed on the vibration isolation table, and through the right alignment between regulating spring adjusting and the piston.
Described cavity is a right cylindrical, and the diameter of cavity and equal in length, the side wall centers of cavity are provided with the mounting hole that microphone to be calibrated is installed, and seals through O type circle between mounting hole and the microphone to be calibrated.
Described piston is circular, and the direction of motion of piston is identical with the axial direction of cavity.
Advantage that the present invention has and beneficial effect,
1,, influence factors such as heat conduction, pressure leakage, viscous have been reduced to obtaining the influence of tiny pulsation pressure amplitude through reasonably designing cavity and piston.
2, can obtain the interior tiny pulsation pressure of 1Hz～500Hz scope continuously.
3, use regulating spring to reduce the friction force between piston and the cavity, reduced to obtain the distortion of tiny pulsation pressure.
4, calculate the tiny pulsation pressure that the acquisition sensor is experienced through the theoretical formula of having considered influences such as heat conduction, pressure leakage, viscous, guaranteed the accuracy of calibration.
5, the present invention also can carry out the calibration of sensitivity and frequency response within the specific limits to microphone.
The present invention obtains the tiny pulsation pressure of simulation through the motion of piston in airtight cavity; And be coupled to this tiny pulsation pressure on the diaphragm of sensor; Make the tiny pulsation pressure sensitivity response of sensor can be directly change relevantly, realize that the sensor tiny pulsation pressure calibrates with the tiny pulsation pressure of diaphragm impression.
Utilize shaking table to produce low-frequency vibration, drive piston and in airtight cavity, do sinusoidal vibration, produce the tiny pulsation pressure that is used for the sinusoidal variations that pick up calibration uses.This tiny pulsation pressure is coupled on the sensor, utilizes the output of sensor and the tiny pulsation pressure value that is produced that the theoretical calculation formula after the compensation calculates, just can calculate the sensitivity of sensor.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Embodiment
Tiny pulsation pressure generator comprises cavity 1, piston 2, shaking table 3, vibration isolation table 4 and the regulating spring 5 of sealing, and cavity 1 is positive cylindrical cavity, the equal in length of the diameter of cavity 1 and cavity 1; Piston 2 places between cavity 1 and the shaking table 3 and is fixed on the shaking table 3; The two ends of shaking table 3 respectively are provided with a vibration isolation table 4, and cavity 1 is installed on the vibration isolation table 4, and through the right alignment between regulating spring 5 adjustings and the piston 2.
Described cavity 1 is a right cylindrical, and the diameter of cavity and equal in length, the side wall centers of cavity are provided with the mounting hole that microphone 6 to be calibrated is installed, and seals through O type circle between mounting hole and the microphone to be calibrated 6.
Described piston 2 is circular, and the direction of motion of piston is identical with the axial direction of cavity.
It is reciprocating in the airtight cavity of certain volume that shaking table drives piston rod, because the to-and-fro movement of piston rod makes the volume in the airtight cavity change, thereby causes the pressure in the airtight cavity to produce pulsatile change.Utilize shaking table to produce low-frequency vibration; Drive piston and in piston type calibrating device cavity, do sinusoidal motion; Piston motion excites the fluctuation pressure consistent with vibration frequency in cavity; The displacement of piston is carried out precision measurement through the heterodyne system laser interferometer, can calculate the force value of generation then through theoretical formula.
Piston is fixedly mounted on the shaking table; Cavity is installed on the vibration isolation table, and through the right alignment between regulating spring adjusting and the piston.Computer control shaking table controller makes shaking table drive piston and in airtight cavity, does sinusoidal vibration, and the tiny pulsation pressure that changes is installed in the axially central microphone of cavity through the sealing of O type circle, prevents pressure leakage.Microphone is experienced the tiny pulsation pressure that generator produces and is converted into electric signal and passes to computing machine through data acquisition system (DAS).The relative displacement of piston and cavity is measured through the heterodyne system laser interferometer, and resolution can reach λ/2, and the laser interference signal is also passed to computing machine through data acquisition system (DAS).Calculate the sensitivity and the frequency response curve of microphone.
Claims (3)
1. the tiny pulsation pressure generator of a dynamic pressure calibrating installation; It is characterized in that; Tiny pulsation pressure generator comprises cavity (1), piston (2), shaking table (3), vibration isolation table (4) and the regulating spring (5) of sealing; Cavity (1) is positive cylindrical cavity, the equal in length of the diameter of cavity (1) and cavity (1); Piston (2) places between cavity (1) and the shaking table (3) and is fixed on the shaking table (3); The two ends of shaking table (3) respectively are provided with a vibration isolation table (4), and cavity (1) is installed on the vibration isolation table (4), and through the right alignment between regulating spring (5) adjusting and the piston (2), shaking table (3) is through shaking table controller (7) control.
2. the tiny pulsation pressure generator of dynamic pressure calibrating installation according to claim 1; It is characterized in that; Described cavity (1) is a right cylindrical; The diameter of cavity and equal in length, the side wall centers of cavity are provided with the mounting hole that microphone to be calibrated (6) is installed, and seal through O type circle between mounting hole and the microphone to be calibrated (6).
3. the tiny pulsation pressure generator of dynamic pressure calibrating installation according to claim 1 is characterized in that, described piston (2) is circular, and the direction of motion of piston is identical with the axial direction of cavity.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810240984A CN101441125B (en) | 2008-12-26 | 2008-12-26 | Tiny pulsation pressure generator |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200810240984A CN101441125B (en) | 2008-12-26 | 2008-12-26 | Tiny pulsation pressure generator |
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| CN101441125A CN101441125A (en) | 2009-05-27 |
| CN101441125B true CN101441125B (en) | 2012-10-10 |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102636247A (en) * | 2012-03-28 | 2012-08-15 | 西北工业大学 | Experimental method of surge detecting device of gas compressor |
| CN103362903A (en) * | 2012-04-10 | 2013-10-23 | 上海示才生物科技有限公司 | Low-frequency micro pulsating pressure generator |
| CN106153249B (en) * | 2016-05-28 | 2019-09-27 | 中国航空工业集团公司北京长城计量测试技术研究所 | One kind can trace to the source liquid sinusoidal pressure calibrating installation |
| CN106323544B (en) * | 2016-08-26 | 2019-10-11 | 上海交通大学 | A kind of thin film sensor array calibrating apparatus and scaling method based on acoustic pressure load |
| CN108955997B (en) * | 2018-09-10 | 2020-05-12 | 中国航空工业集团公司北京长城计量测试技术研究所 | Inertial force method gas dynamic pressure laser interferometry system and method |
| CN109236807B (en) * | 2018-09-13 | 2020-01-10 | 中国航空工业集团公司北京长城计量测试技术研究所 | Tiny dynamic pressure generator based on liquid-gas pressure conversion and working method |
| CN109341945B (en) * | 2018-11-23 | 2020-08-21 | 中国航空工业集团公司北京长城计量测试技术研究所 | Pulse pressure measurement correction method based on double tube cavities |
| CN110082031A (en) * | 2019-05-27 | 2019-08-02 | 苏州东菱科技有限公司 | A kind of calibrating installation of pressure sensor |
| CN111998997A (en) * | 2020-09-27 | 2020-11-27 | 中国航空工业集团公司北京长城计量测试技术研究所 | Low-temperature pulsating pressure calibration device |
| CN112326110B (en) * | 2020-11-08 | 2022-07-12 | 中国航空工业集团公司北京长城计量测试技术研究所 | High-low temperature sine pressure calibration device based on pressure-force value conversion |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4499751A (en) * | 1983-04-01 | 1985-02-19 | Pcb Piezotronics, Inc. | Dynamic pressure generator |
| SU1721455A1 (en) * | 1989-07-01 | 1992-03-23 | Научно-Исследовательский И Конструкторско-Технологический Институт Средств Контроля Электронной Аппаратуры И Изделий Электронной Техники "Контрольприбор" | Hydraulic pulsator |
| CN200968895Y (en) * | 2006-09-12 | 2007-10-31 | 西北工业大学 | Full-automatic tiny pressure setting apparatus |
| CN201155999Y (en) * | 2007-12-03 | 2008-11-26 | 北京康斯特仪表科技有限公司 | Automatic micro-pressure generator |
-
2008
- 2008-12-26 CN CN200810240984A patent/CN101441125B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4499751A (en) * | 1983-04-01 | 1985-02-19 | Pcb Piezotronics, Inc. | Dynamic pressure generator |
| SU1721455A1 (en) * | 1989-07-01 | 1992-03-23 | Научно-Исследовательский И Конструкторско-Технологический Институт Средств Контроля Электронной Аппаратуры И Изделий Электронной Техники "Контрольприбор" | Hydraulic pulsator |
| CN200968895Y (en) * | 2006-09-12 | 2007-10-31 | 西北工业大学 | Full-automatic tiny pressure setting apparatus |
| CN201155999Y (en) * | 2007-12-03 | 2008-11-26 | 北京康斯特仪表科技有限公司 | Automatic micro-pressure generator |
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| CN101441125A (en) | 2009-05-27 |
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