CN110702947B - High temperature resistant accelerometer calibration is with connecting piece - Google Patents
High temperature resistant accelerometer calibration is with connecting piece Download PDFInfo
- Publication number
- CN110702947B CN110702947B CN201910975271.1A CN201910975271A CN110702947B CN 110702947 B CN110702947 B CN 110702947B CN 201910975271 A CN201910975271 A CN 201910975271A CN 110702947 B CN110702947 B CN 110702947B
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- accelerometer
- connecting piece
- conical
- standard
- calibrated
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- 239000000463 material Substances 0.000 claims abstract description 19
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 7
- 239000010431 corundum Substances 0.000 claims abstract description 7
- 238000009413 insulation Methods 0.000 claims description 15
- 230000017525 heat dissipation Effects 0.000 claims description 8
- 238000009434 installation Methods 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims description 2
- 238000012545 processing Methods 0.000 abstract description 2
- 238000013461 design Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 5
- 239000000919 ceramic Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000011000 absolute method Methods 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P21/00—Testing or calibrating of apparatus or devices covered by the preceding groups
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P1/00—Details of instruments
Abstract
The invention discloses a high-temperature-resistant accelerometer calibration connecting piece, which comprises a connecting piece body; wherein, the connecting piece body is integrally formed into a cylindrical part and a conical part; the cylindrical part is hollow cylindrical, one end of the cylindrical part is sealed to form a calibrated accelerometer mounting surface, and a threaded mounting hole is formed in the surface; the conical part is hollow conical, the inner surface and the outer surface of the conical part are conical, and the taper of the outer surface can be more than or equal to the taper of the inner surface; the combination of the hollow cylinder and the hollow cone can greatly improve the transverse resonance frequency and transverse rigidity of the connecting piece; the corundum material is adopted as the processing material of the connecting piece, the elastic modulus of the material is obviously higher than that of other conventional materials, and the transverse rigidity and the resonance frequency of the connecting piece can be improved.
Description
Technical Field
The invention relates to the technical field of sensors, in particular to a connecting piece for calibrating a high-temperature-resistant accelerometer.
Background
The method for calibrating the sensitivity of the vibration accelerometer in the normal temperature environment comprises an absolute method and a comparison method, wherein the comparison method is most widely applied, and the standard accelerometer and the accelerometer to be calibrated are arranged back to back and rigidly on the table top of the vibration table for comparing the output responses of the standard accelerometer and the accelerometer to be calibrated, so that the accurate sensitivity value of the accelerometer to be calibrated is given. For vibration accelerometer calibration under high temperature environment, a common method is to add a connecting piece with better rigidity, one end of the connecting piece is provided with a standard accelerometer, and the other end is provided with a calibrated accelerometer. The standard accelerometer is placed in a normal temperature environment and the calibrated accelerometer is placed in a high temperature environment. The high temperature environment is typically provided by a small heating furnace, the excitation is provided by a standard vibrating table, and the standard accelerometer and the calibrated accelerometer must be rigidly and coaxially mounted in the center of the table top of the vibrating table.
The design of the connecting piece is the core of the whole calibrating device, and the technical difficulty is mainly that the material selection and the geometric configuration design are adopted, and the upper limit frequency applicable to the connecting piece with poor design is low. Since the upper limit of the conventional frequency of use of the accelerometer for vibration testing is 2000Hz or even higher, the calibration frequency range should cover the frequency range of use of the accelerometer. The connection must therefore be made of a material with a sufficiently high modulus of elasticity, and in the same mass, the geometry of the connection must be designed to be as stiff as possible. In addition, since the load carrying capacity of the existing standard vibration table is relatively weak, the material of the connecting piece must be a material with relatively low density, otherwise the performance of the standard vibration table is reduced or even the standard vibration table cannot be used. Because the connector will transfer the high temperature in the heating furnace to the standard accelerometer and standard vibrating table, resulting in a change in the performance of the standard accelerometer and standard vibrating table, it is also desirable that the thermal conductivity of the connector material be as low as possible, or that other effective measures be taken, so that the temperatures of the standard accelerometer and standard vibrating table remain within the desired range without affecting the performance of both. It is difficult to select materials that meet the criteria of high modulus of elasticity, low density, low thermal conductivity at the same time.
The upper limit of the frequency of the comparison method calibration device which is disclosed at present can be about 1000Hz, and the requirement of at least 2000Hz of the upper limit of the common vibration frequency can not be met.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the present invention aims at: the high-temperature-resistant accelerometer calibration connecting piece is capable of achieving the purpose of improving the resonance frequency of the connecting piece, enabling the connecting piece to calibrate the accelerometer in a high-temperature environment, and enabling the resonance frequency of the connecting piece to be more than 2000 Hz.
In order to achieve the above object, the present invention provides the following technical solutions:
a high temperature resistant accelerometer calibration connector comprises a connector body; wherein, the connecting piece body is integrally formed into a cylindrical part and a conical part; the cylindrical part is hollow cylindrical, and one end of the cylindrical part is sealed; the conical part is hollow conical tube shape, the inner surface is conical, and the taper of the inner surface is smaller than or equal to that of the outer surface.
Optionally, the connector body is made of corundum material.
Optionally, the end of the conical part is further provided with a mounting boss, and a plurality of mounting through holes are formed in the mounting boss at intervals and used for connecting the connecting piece with the standard vibrating table.
Optionally, the accelerometer mounting surface is provided with a threaded hole.
The high-temperature-resistant accelerometer calibration system comprises a high-temperature chamber, a standard vibrating table, a heat dissipation part and the high-temperature-resistant accelerometer calibration connecting piece; the cylindrical part of the connecting piece body stretches into the high-temperature chamber, the installation boss of the conical part is fixedly connected with the table top of the standard vibration table, and the heat dissipation part is used for dissipating heat of the standard accelerometer, the conical part and the standard vibration table.
Optionally, the heat dissipation component is a fan, and blows to the standard accelerometer.
Optionally, the high temperature resistant accelerometer calibration system further comprises a support portion for preventing direct contact between the mounting boss of the connector body and the standard vibration table.
Optionally, the high temperature resistant accelerometer calibration system further comprises a heat insulation component, wherein the heat insulation component is arranged at the contact position of the cylindrical part of the connector body and the high temperature chamber and is used for sealing the high temperature chamber.
Compared with the prior art, the invention has the following beneficial effects:
1. the hollow cylinder and the hollow cone are combined and integrally formed; this geometry can significantly increase the transverse resonant frequency and transverse stiffness of the connector.
2. The corundum material is adopted as the processing material of the connecting piece, the elastic modulus of the material is obviously higher than that of other conventional materials, and the transverse rigidity and the resonance frequency of the connecting piece can be improved.
Drawings
FIG. 1 is a block diagram of a connector for calibrating a high temperature resistant accelerometer of the present invention;
FIG. 2 is a cross-sectional view of the high temperature resistant accelerometer calibration connector shown in FIG. 1;
FIG. 3 is a schematic diagram of a high temperature resistant accelerometer calibration system of the present invention;
list of reference numerals
1-high temperature room, 2-accelerometer to be calibrated, 3-heat insulating component, 4-connecting piece body, 5-standard accelerometer, 6-supporting part, 7-standard shaking table, 8-heat radiating component, 401-cylinder portion, 402-cone portion, 403-accelerometer to be calibrated installation face.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention.
As shown in fig. 1 and 2, a high temperature resistant accelerometer calibration connector comprises a connector body 4; wherein, the connector body 4 is integrally formed into a cylindrical part 401 and a conical part 402; the cylindrical portion 401 is hollow and cylindrical, and one end of the cylindrical portion 401 is sealed to form a calibrated accelerometer mounting surface 403; the conical part 402 is hollow and conical, the inner surface of the conical part is conical, the taper of the inner surface is smaller than or equal to that of the outer surface, and the geometric configuration can significantly improve the transverse resonance frequency and transverse rigidity of the connecting piece.
The calibrated accelerometer 2 is mounted on the calibrated accelerometer mounting surface 403, stretches into the high-temperature chamber 1, and the standard accelerometer 5 is mounted on the table surface of the standard vibrating table 7. The cylindrical portion 401 may serve as a size fit and seal with the high temperature chamber 1. The conical portion 402 serves primarily to increase the overall transverse resonant frequency of the connector. If necessary, the wall thickness and the characteristic dimension of the connecting piece can be properly adjusted according to the specific conditions of the accelerometer 2 and the standard accelerometer 5 to be calibrated and the specific conditions of the high-temperature chamber 1, but the basic thought of design is kept unchanged, and the topological shape of the section is not changed significantly.
The connector body 4 is made of corundum material. The elastic modulus of the high-purity corundum can reach about 380GPa, the density is about 3.7 g/cm < 3 >, the resonant frequency of the connecting piece can be obviously improved by using the material to design the connecting piece, and meanwhile, the applicable temperature range can reach 800 ℃, so that the whole device has better rigidity.
The end of the conical part 402 is further provided with a mounting boss 404, and a plurality of mounting through holes are formed in the mounting boss 404 at intervals, and are used for connecting the connector body 4 with the standard vibration table 7, and the standard accelerometer 5 is fixed inside the conical part 402 of the connector body 4 and is coaxial with the accelerometer 2 to be calibrated.
The surface of the accelerometer installation surface 403 to be calibrated is provided with a threaded hole for installing the accelerometer 2 to be calibrated, and a transition block can be optionally installed between the connector body 4 and the accelerometer 2 to be calibrated, so as to improve the service life and connection reliability of the connector, and the accelerometer 2 to be calibrated and the connector body 4 are coaxial during installation.
As shown in fig. 3, a high temperature resistant accelerometer calibration system comprises a high temperature chamber 1, a standard vibration table 7, a heat dissipation component 8 and a connector of the invention; the cylindrical part 401 of the connector body 4 extends into the high-temperature chamber 1, the mounting boss 404 of the conical part 402 is fixedly connected with the table surface of the standard vibration table 7, the heat dissipation part 8 is used for dissipating heat of the conical part 402, the standard vibration table 7 and the standard accelerometer 5, and the heat dissipation part 8 is a fan and blows to the standard accelerometer 5; the high-temperature-resistant accelerometer calibration system comprises a supporting part 6, wherein the supporting part 6 is used for enabling a gap to exist between a mounting boss of the connector body 4 and the standard vibration table 7; the high-temperature chamber 1 is formed by a heating furnace provided with an opening in which the cylindrical portion 401 can be placed.
Since the material of the connector in this patent is selected to be corundum, its thermal conductivity is about 20W/mK, which is relatively high, this can lead to the conical portion 402 being too hot for high temperature calibration, because of the need to dissipate heat. The supporting part 6 is formed by a plurality of standard vibrating table surface bolts, and the table surface bolts enable the connecting piece body 4 to be fixedly connected with the table surface of the standard vibrating table 7 through the through holes on the mounting boss 404; meanwhile, a certain gap is formed between the mounting boss 404 of the connector body 4 and the table surface of the standard vibration table 7, and then the standard accelerometer 5 and the conical part 402 are cooled by a fan.
The high temperature resistant accelerometer calibration system further comprises a heat insulation component 3, wherein the heat insulation component 3 is arranged at the contact position of the cylindrical part 401 of the connector body 4 and the high temperature chamber 1 and is used for sealing the high temperature chamber 1. The heat insulation component 3 adopts a double-layer cylindrical heat insulation sleeve made of hard ceramic fibers and a flexible heat insulation felt, wherein the outer layer of the heat insulation sleeve is the hard ceramic fibers, the inner layer of the heat insulation sleeve is the flexible heat insulation felt, the heat insulation sleeve is sleeved on the outer side wall of the cylindrical part 401, and the outer layer of the heat insulation sleeve is in contact with the heating furnace, and the inner layer of the heat insulation sleeve is in slight contact with the connecting piece, so that the heating furnace can be sealed, and the acceleration calibration process is not influenced.
While the embodiments of the present invention have been described above, it will be apparent that the invention is capable of many variations and modifications, such as changes in the taper and wall thickness of the connector, the height of the conical and cylindrical portions, the specific design of the sleeve, etc., without departing from the spirit and scope of the invention.
Claims (3)
1. The high temperature resistant accelerometer calibration connector is characterized by comprising a connector body (4);
wherein, the connecting piece body (4) is integrally formed into a cylindrical part (401) and a conical part (402);
the cylindrical part (401) is hollow and cylindrical, one end of the cylindrical part (401) is sealed, and a calibrated accelerometer mounting surface (403) is formed; the conical part (402) is hollow conical, the inner surface and the outer surface of the conical part are conical, and the taper of the inner surface of the conical part (402) is less than or equal to the taper of the outer surface;
the hollow cylinder and the hollow cone are combined and integrally formed;
the end part of the conical part (402) is also provided with a mounting boss (404), and a plurality of mounting through holes are arranged on the mounting boss (404) at intervals and are used for connecting the connecting piece body (4) with the standard vibrating table (7);
the standard accelerometer (5) is fixed in the conical part (402) of the connecting piece body (4) and is coaxial with the accelerometer (2) to be calibrated;
the installation surface (403) of the accelerometer (2) to be calibrated is provided with a threaded hole for installing the accelerometer (2) to be calibrated;
a transition block is arranged between the connecting piece body (4) and the accelerometer (2) to be calibrated so as to improve the service life and connection reliability of the connecting piece, and the accelerometer (2) to be calibrated is coaxial with the connecting piece body (4) during installation.
2. A connection for calibrating a high temperature resistant accelerometer according to claim 1, wherein said connection body (4) is made of corundum material.
3. A high temperature resistant accelerometer calibration system comprising a high temperature chamber (1), a standard vibration table (7), characterized by comprising a heat dissipating component (8) and a high temperature resistant accelerometer calibration connector according to claim 2;
the cylindrical part (401) of the connecting piece body (4) stretches into the high-temperature chamber (1), the installation boss (404) of the conical part (402) is fixedly connected with the table top of the standard vibration table (7), and the heat dissipation part (8) is used for dissipating heat of the standard accelerometer (5), the conical part (402) and the standard vibration table (7);
the high-temperature-resistant accelerometer calibration system also comprises a supporting part (6) and a heat insulation component (3);
the supporting part (6) is used for enabling a gap to exist between the mounting boss (404) of the connecting piece body (4) and the standard vibration table (7);
the heat insulation component (3) is arranged at the contact position of the cylindrical part (401) of the connecting piece body (4) and the high-temperature chamber (1) and is used for sealing the high-temperature chamber (1);
the heat dissipation part (8) is a fan and blows to the standard accelerometer (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910975271.1A CN110702947B (en) | 2019-10-14 | 2019-10-14 | High temperature resistant accelerometer calibration is with connecting piece |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910975271.1A CN110702947B (en) | 2019-10-14 | 2019-10-14 | High temperature resistant accelerometer calibration is with connecting piece |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110702947A CN110702947A (en) | 2020-01-17 |
| CN110702947B true CN110702947B (en) | 2024-03-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910975271.1A Active CN110702947B (en) | 2019-10-14 | 2019-10-14 | High temperature resistant accelerometer calibration is with connecting piece |
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| CN (1) | CN110702947B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113640546B (en) * | 2021-08-18 | 2022-11-29 | 中国工程物理研究院总体工程研究所 | Accelerometer temperature response calibration device and method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2393488C1 (en) * | 2009-04-06 | 2010-06-27 | Государственное образовательное учреждение высшего профессионального образования "Уральский государственный университет путей сообщения" (УрГУПС) | Acceleration device for generating standard accelerations when testing and calibrating accelerometres |
| CN104597288A (en) * | 2013-10-30 | 2015-05-06 | 北京强度环境研究所 | Calibration device for high-temperature acceleration senor |
| CN106989816A (en) * | 2017-06-02 | 2017-07-28 | 中国航发南方工业有限公司 | Turbo oar engine vibration-measuring sensor is calibrated and measurement apparatus |
| CN207248916U (en) * | 2017-09-04 | 2018-04-17 | 广西电网有限责任公司电力科学研究院 | A kind of acceleration transducer calibrating installation |
| CN208818338U (en) * | 2018-11-02 | 2019-05-03 | 脉创测控装备科技（苏州）有限公司 | High-temperature vibrating sensor calibrating system |
| CN210863784U (en) * | 2019-10-14 | 2020-06-26 | 中国工程物理研究院总体工程研究所 | Connecting piece and calibration system for calibrating high-temperature-resistant accelerometer |
-
2019
- 2019-10-14 CN CN201910975271.1A patent/CN110702947B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2393488C1 (en) * | 2009-04-06 | 2010-06-27 | Государственное образовательное учреждение высшего профессионального образования "Уральский государственный университет путей сообщения" (УрГУПС) | Acceleration device for generating standard accelerations when testing and calibrating accelerometres |
| CN104597288A (en) * | 2013-10-30 | 2015-05-06 | 北京强度环境研究所 | Calibration device for high-temperature acceleration senor |
| CN106989816A (en) * | 2017-06-02 | 2017-07-28 | 中国航发南方工业有限公司 | Turbo oar engine vibration-measuring sensor is calibrated and measurement apparatus |
| CN207248916U (en) * | 2017-09-04 | 2018-04-17 | 广西电网有限责任公司电力科学研究院 | A kind of acceleration transducer calibrating installation |
| CN208818338U (en) * | 2018-11-02 | 2019-05-03 | 脉创测控装备科技（苏州）有限公司 | High-temperature vibrating sensor calibrating system |
| CN210863784U (en) * | 2019-10-14 | 2020-06-26 | 中国工程物理研究院总体工程研究所 | Connecting piece and calibration system for calibrating high-temperature-resistant accelerometer |
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| CN110702947A (en) | 2020-01-17 |
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