CN215339931U - Accelerometer low-pressure performance testing device - Google Patents
Accelerometer low-pressure performance testing device Download PDFInfo
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- CN215339931U CN215339931U CN202121984133.9U CN202121984133U CN215339931U CN 215339931 U CN215339931 U CN 215339931U CN 202121984133 U CN202121984133 U CN 202121984133U CN 215339931 U CN215339931 U CN 215339931U
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Abstract
The utility model discloses a low-pressure performance testing device of an accelerometer, which comprises a testing box, an end tooth dividing head, a vacuum pump and an acquisition testing system, wherein the end tooth dividing head is arranged on the testing box; one side of the test box is provided with an opening, and a box cover is arranged at the opening; the test box is connected with an output shaft of the end tooth dividing head and can synchronously rotate along with the end tooth dividing head; an accelerometer mounting seat and a pressure gauge are arranged in the test box; the vacuum pump is communicated with the test box through a pipeline, and the pressure value in the test box is monitored through a pressure gauge; the acquisition and test system is respectively connected with the end tooth dividing head and the test box and is used for controlling the rotation of the end tooth dividing head and acquiring and analyzing the relevant data of the test box measured by the acquisition and test system. The utility model can truly reflect the performance of the accelerometer under different air pressures, provides important support for the environmental adaptability research of the accelerometer, and has great significance for the application of the accelerometer in aviation and aerospace.
Description
Technical Field
The utility model relates to the technical field of accelerometers, in particular to a low-air-pressure performance testing device for an accelerometer.
Background
The quartz flexible accelerometer is used for measuring acceleration information of a carrier and is one of core devices of an inertial navigation system. The quartz flexible accelerometer is widely applied to the high-precision application fields of aerospace and the like due to the characteristics of simple structure, small volume, higher measurement precision and the like.
When the inertial system is used in plateau, aviation and aerospace, the actual use environment and air pressure conditions of the inertial system are different, and the use environments of the accelerometers arranged in the inertial system are also different. With the continuous improvement of the requirement of the environmental adaptability of the system, the system has more definite and specific requirements on the accuracy of the sensor (including an accelerometer, a gyroscope and other electronic devices) in a low-pressure environment. Although the quartz accelerometer is designed in a sealing manner, the test is basically carried out under the standard atmosphere, the actual using environment atmospheric pressure condition is greatly different from the testing environment atmospheric pressure condition, and the tested precision cannot truly reflect the relation between the performance parameters (such as offset, scale factor and second-order nonlinear coefficient) of the accelerometer under different atmospheric pressures and the atmospheric pressure, so that the problem easily occurs when the accelerometer is used under low atmospheric pressure.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects in the prior art, the utility model aims to solve the problem that the relation between the performance parameters of the accelerometer measured under the standard atmospheric pressure and the atmospheric pressure cannot be truly reflected in the prior art, and provides the low-atmospheric-pressure performance testing device of the accelerometer, which can truly reflect the performance of the accelerometer under different atmospheric pressures, provide important support for the environmental adaptability research of the accelerometer and have great significance for the application of the accelerometer in aviation and aerospace.
In order to solve the technical problems, the utility model adopts the following technical scheme:
a low-pressure performance testing device of an accelerometer comprises a testing box, an end tooth dividing head, a vacuum pump, an accelerometer to be tested and an acquisition testing system; one side of the test box is open, and a box cover is arranged on the open side; the test box is connected with an output shaft of the end tooth dividing head and can synchronously rotate under the driving of the end tooth dividing head; an accelerometer mounting seat is arranged in the test box, and the accelerometer to be tested is mounted on the accelerometer mounting seat; the vacuum pump is communicated with the test box through a pipeline, and the pressure value in the test box can be monitored through the pressure gauge; the acquisition and test system is respectively connected with the end tooth dividing head and the accelerometer to be tested and is used for controlling the rotation of the end tooth dividing head and acquiring and analyzing the acquired data of the accelerometer to be tested.
By arranging the test box, the end tooth dividing head, the vacuum pump, the accelerometer to be tested and the acquisition test system, the end tooth dividing head can control the test box to rotate, so that the four-point rolling test of the accelerometer is realized; the air pressure in the test box is controlled by the vacuum pump, so that the performance or the corresponding relation of the accelerometer under different air pressures can be truly reflected, and important support is provided for the environmental adaptability research of the accelerometer.
Further, the end tooth index head is mounted on a vibration isolation device. The vibration of the vacuum pump during operation can affect the precision of the end tooth indexing head, thereby affecting the repeated precision of the test. The end-tooth index head therefore has to be mounted on the vibration isolation device. The vibration isolation device can adopt measures such as a vibration isolation pad, a vibration absorber and the like to realize isolation. Meanwhile, in order to better avoid the vibration influence of the vacuum pump, the vacuum pump needs to be subjected to vibration isolation treatment during installation, and the purpose of finally eliminating the influence of external factors on the test effect of the accelerometer is achieved.
Furthermore, a blind hole is formed in the test box, an installation bulge is correspondingly arranged on the output shaft of the end tooth dividing head, and the installation bulge extends into the blind hole and is tightly matched with the test box through a screw. Therefore, the air tightness requirement of the test box can be better ensured, and the test data are accurate.
Furthermore, the precision of the end tooth dividing head is 0.1', and the high repeatability of the position required by each test is ensured.
Furthermore, the pressure gauge adopts an absolute pressure gauge, the measuring range of the absolute pressure gauge is 0-1KPa, and the precision grade is 0.5%, so that the precision of the pressure gauge is high, and the relation between the performance of the accelerometer and the air pressure can be reflected more accurately.
Furthermore, a sealing strip which surrounds the periphery of the open side of the test box is arranged between the box cover and the test box, so that the test box can be sealed when the box cover is closed on the test box, the air tightness requirement of the test box can be better ensured, and the test data are accurate.
Compared with the prior art, the utility model has the following advantages:
through setting up test box, end tooth dividing head, vacuum pump, the accelerometer that awaits measuring and gather test system, the end tooth dividing head can control the test box and rotate to realize the four-point test that rolls of accelerometer. The air pressure in the test box is controlled by the vacuum pump, so that the performance or the corresponding relation of the accelerometer under different air pressures can be truly reflected, and important support is provided for the environmental adaptability research of the accelerometer.
Drawings
FIG. 1 is a schematic diagram of an apparatus for testing low pressure performance of an accelerometer according to the present invention.
In the figure: the test box comprises a test box 1, an end tooth dividing head 2, a vacuum pump 3, an accelerometer mounting seat 4 and an acquisition test system 5.
Detailed Description
The utility model will be further explained with reference to the drawings and the embodiments.
Example (b):
referring to fig. 1, the device for testing the low-pressure performance of the accelerometer comprises a test box 1, an end tooth dividing head 2, a vacuum pump 3, the accelerometer to be tested and an acquisition test system 5. One side of the test box 1 is open, and a box cover is arranged on the open side. When the test box is specifically implemented, one of the vertical side surfaces of the test box 1 is open, a sealing strip surrounding the open side of the test box 1 is arranged between the box cover and the test box 1, so that the test box 1 can be sealed when the test box 1 is covered, the air tightness requirement of the test box 1 can be better guaranteed, and the test data are accurate. The test box 1 is connected with an output shaft of the end tooth dividing head 2 and can synchronously rotate under the driving of the end tooth dividing head 2. During specific implementation, a blind hole is formed in one side, opposite to the open side, of the test box 1, an installation bulge is correspondingly arranged on an output shaft of the end tooth dividing head 2, and the installation bulge extends into the blind hole and is tightly matched with the test box 1 through a screw. Therefore, the air tightness requirement of the test box 1 can be better ensured, and the test data are accurate. The accuracy of the end tooth index head 2 is preferably 0.1 "to ensure high repeatability of the position required for each test. The end-tooth index head 2 is mounted on a vibration isolation device. The accuracy of the end tooth indexing head 2, and hence the repeatability of the test, is affected by the vibrations of the vacuum pump 3 during operation. The end-tooth index head 2 therefore has to be mounted on a vibration isolation device. The vibration isolation device can adopt measures such as a vibration isolation pad, a vibration absorber and the like to realize isolation. An accelerometer mounting seat 4 is arranged in the test box 1, and the accelerometer to be tested is mounted on the accelerometer mounting seat 4. Still install the manometer on test box 1, vacuum pump 3 passes through the pipeline and communicates with test box 1, can monitor the pressure value in the test box 1 through the manometer. Preferably, the pressure gauge is an absolute pressure gauge, the measurement range of the absolute pressure gauge is 0-1KPa, and the precision grade is 0.5%, so that the precision of the pressure gauge is high, and the relation between the performance of the accelerometer and the air pressure can be reflected more accurately. During implementation, in order to better avoid the vibration influence of the vacuum pump 3, the vacuum pump 3 needs to be subjected to vibration isolation treatment during installation, so that the purpose of finally eliminating the influence of external factors on the test effect of the accelerometer is achieved. The acquisition and test system 5 is respectively connected with the end tooth dividing head 2 and the accelerometer to be tested and is used for controlling the rotation of the end tooth dividing head 2 and acquiring and analyzing the acquired data of the accelerometer to be tested.
Through setting up test box 1, end tooth dividing head 2, vacuum pump 3, the accelerometer that awaits measuring and gather test system 5, end tooth dividing head 2 can control test box 1 and rotate to realize the four-point test that rolls of accelerometer. The vacuum pump 3 is used for controlling the air pressure in the test box 1, so that the performance or the corresponding relation of the accelerometer under different air pressures can be truly reflected, and important support is provided for the environmental adaptability research of the accelerometer.
The method for measuring the low-air-pressure performance of the accelerometer by adopting the device for testing the low-air-pressure performance of the accelerometer comprises the following steps:
and S1, mounting the accelerometer on the accelerometer mounting seat 4 in the test box 1, and closing the box cover to seal the test box 1.
And S2, after the accelerometer is electrified and checked to be correct, the vacuum pump 3 is controlled to work through the acquisition and test system 5, so that the air pressure value in the test box 1 reaches a set value and keeps balance.
And S3, controlling the end tooth dividing head 2 to rotate and drive the test box 1 to rotate through the acquisition test system 5, acquiring the output value of the accelerometer in the test box 1 and analyzing the output value to obtain the corresponding relation between the performance parameters of the accelerometer and the air pressure. Specifically, in step S3, the acquisition and testing system 5 controls the end tooth index head 2 to rotate including clockwise rotation and counter-rotation by 0 °, 90 °, 180 °, 270 °, and 0 °, 90 °, 180 °, 270 °, so that the angle setting is reasonable and the obtained data is more accurate.
And S4, replacing the set air pressure value, and repeating the step S3 to obtain the corresponding relation between the performance parameters of the accelerometer and the air pressure under different pressure values.
Obtaining four output values of clockwise rotation, counter-clockwise rotation and counter-clockwise rotation of the indexing device at four positions of 0 °, 90 °, 180 °, 270 ° and counter-clockwise rotation through step S3, calculating an average value of the output values of the accelerometers at the four positions of the indexing device at the four positions of clockwise rotation and counter-clockwise rotation, and calculating coefficients K0, K1, K2, δ 0 and δ P according to formulas (1), (2), (3), (4) and (5):
in the formula:
δ0、δp-misalignment angle, rad, calculated for the test data in the pendulum and door installation states, respectively.
The steps are repeated, the set air pressure value is changed through the acquisition and test system, the performance indexes of all parameters of the accelerometer under different air pressure conditions can be obtained, the corresponding relation between the performance indexes of the accelerometer and the air pressure is obtained according to data obtained through test calculation, and important test data are provided for the environmental adaptability research of the accelerometer.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the technical solutions, and those skilled in the art should understand that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all that should be covered by the claims of the present invention.
Claims (6)
1. The low-air-pressure performance testing device of the accelerometer is characterized by comprising a testing box, an end tooth dividing head, a vacuum pump, the accelerometer to be tested and an acquisition testing system; one side of the test box is open, and a box cover is arranged on the open side; the test box is connected with an output shaft of the end tooth dividing head and can synchronously rotate under the driving of the end tooth dividing head; an accelerometer mounting seat is arranged in the test box, and the accelerometer to be tested is mounted on the accelerometer mounting seat; the vacuum pump is communicated with the test box through a pipeline, and the pressure value in the test box can be monitored through the pressure gauge; the acquisition and test system is respectively connected with the end tooth dividing head and the accelerometer to be tested and is used for controlling the rotation of the end tooth dividing head and acquiring and analyzing the acquired data of the accelerometer to be tested.
2. The accelerometer subatmospheric pressure performance test apparatus of claim 1 wherein said end-tooth index head is mounted on a vibration isolator.
3. The device for testing the low-air-pressure performance of the accelerometer according to claim 1, wherein a blind hole is formed in the test box, and a mounting protrusion is correspondingly arranged on the output shaft of the end tooth index head, extends into the blind hole and is tightly matched with the test box through a screw.
4. The accelerometer subatmospheric pressure performance test apparatus of claim 1, wherein the accuracy of the end-tooth index head is 0.1 ".
5. The apparatus of claim 1, wherein the pressure gauge is an absolute pressure gauge, and has a measurement range of 0-1KPa and an accuracy level of 0.5%.
6. The apparatus of claim 1, wherein a sealing strip is disposed between the cover and the test box for sealing the test box when the test box is covered by the cover.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121984133.9U CN215339931U (en) | 2021-08-23 | 2021-08-23 | Accelerometer low-pressure performance testing device |
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| CN202121984133.9U CN215339931U (en) | 2021-08-23 | 2021-08-23 | Accelerometer low-pressure performance testing device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113552387A (en) * | 2021-08-23 | 2021-10-26 | 重庆华渝电气集团有限公司 | Accelerometer low-air-pressure performance testing device and testing method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113552387A (en) * | 2021-08-23 | 2021-10-26 | 重庆华渝电气集团有限公司 | Accelerometer low-air-pressure performance testing device and testing method thereof |
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