CN110907661A - Accelerometer dynamic performance testing device and method under low-pressure environment - Google Patents
Accelerometer dynamic performance testing device and method under low-pressure environment Download PDFInfo
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- CN110907661A CN110907661A CN201911319368.3A CN201911319368A CN110907661A CN 110907661 A CN110907661 A CN 110907661A CN 201911319368 A CN201911319368 A CN 201911319368A CN 110907661 A CN110907661 A CN 110907661A
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- 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
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Abstract
The invention discloses an accelerometer dynamic performance testing device under a low-pressure environment, which comprises a testing box with an opening structure at the upper end, wherein a sealing cover is covered at the upper end of the testing box, a connecting plug, an inflation valve, an exhaust tube and an air pressure testing connecting tube which are communicated with an inner cavity of the testing box are respectively arranged on a box body of the testing box, an accelerometer tester, a vacuum pump and a vacuum gauge are also arranged outside the testing box, the access end of the accelerometer tester is connected with the connecting plug in a plugging manner and is electrically connected with a binding post in the connecting plug, the exhaust end of the vacuum pump is connected with the exhaust tube for vacuumizing the inner cavity of the testing box, and the vacuum gauge is arranged on the air pressure testing connecting tube for detecting air pressure in the inner cavity of the testing box. Meanwhile, a method for detecting whether air leakage exists in the quartz flexible accelerometer by using the testing device is also disclosed. The device has simple structure, convenient carrying and accurate and reliable detection.
Description
Technical Field
The invention relates to the field of accelerometer testing, in particular to a device and a method for testing dynamic performance of an accelerometer in a low-pressure environment.
Background
The quartz flexible accelerometer is a force balance pendulum type accelerometer, has the characteristics of good stability, high precision, simple structure, easy miniaturization and the like, and is the accelerometer which is most widely applied to navigation, guidance and control systems of aviation, aerospace, navigation and various strategic/tactical weapons at present.
The quartz flexible accelerometer adopts air film damping to adjust the damping of the accelerometer, and once the structure of the quartz flexible accelerometer is determined, the air film damping is determined by the density of air. After the quartz flexible accelerometer is manufactured, the air density inside the accelerometer is determined by the air density of the assembly line site environment. If the air leakage of the accelerometer occurs in a low-air-pressure application environment and the air density in the gauge head is reduced, the air film damping effect is reduced, the dynamic performance of the accelerometer is deteriorated, and the stability of the accelerometer is deteriorated. Therefore, after the quartz flexible accelerometer is produced and packaged, the damping and other dynamic performance indexes such as overshoot, the number of oscillation waves and the like need to be tested under the low-pressure environment condition to determine whether the accelerometer has the air leakage condition.
Disclosure of Invention
Aiming at the defects of the prior art, the technical problems to be solved by the invention are as follows: how to provide an accelerometer dynamic performance testing device under low atmospheric pressure environment that test is simple and convenient, convenient to carry.
In order to solve the technical problems, the invention adopts the following technical scheme:
a dynamic performance testing device of an accelerometer under a low-pressure environment comprises a testing box with an opening structure at the upper end, wherein the upper end cover of the testing box is combined with a sealing cover, the testing box and the sealing cover are sealed through a sealing ring, a connecting plug head, an inflation valve, an exhaust tube and a pressure testing connecting tube are respectively arranged on a box body of the testing box, the connecting plug head is fixedly connected on the outer side surface of the testing box, a binding post in the connecting plug head penetrates through the testing box and extends into the testing box, the binding post in the connecting plug head is in sealing fit with the testing box, the inflation valve is arranged on the side surface of the testing box and is communicated with an inner cavity of the testing box, the exhaust tube and the pressure testing connecting tube are respectively and fixedly connected on the side surface of the testing box and are communicated with the inner cavity of the testing box, an accelerometer tester, a vacuum pump and a vacuum gauge are also arranged outside the testing box, an access end of the accelerometer tester, the end of bleeding of vacuum pump is connected in order to be used for carrying out evacuation processing to the test box inner chamber with the exhaust tube, and the vacuometer is installed on atmospheric pressure test connecting pipe in order to be used for detecting the atmospheric pressure in the test box inner chamber.
As optimization, set up respectively on the test box two with the connecting thread hole of test box inner chamber intercommunication, the position that just corresponds connecting thread hole outside the test box is provided with the trachea mouthpiece respectively, and the one end threaded connection of trachea mouthpiece is in connecting thread hole, and the coating has sealed glue on the contact surface between trachea mouthpiece and the connecting thread hole, the exhaust tube with the atmospheric pressure test connecting pipe suit is respectively on its corresponding trachea mouthpiece. By coating the sealant, the connection is firmer, and meanwhile, the sealing performance is improved.
As an optimization, the trachea nozzle and the trachea body at one end far away from the connection with the test box extend along the central line direction to form an external thread, the air exhaust tube and the air pressure test connecting tube are elastic rubber tubes, the inner diameters of the air exhaust tube and the air pressure test connecting tube are smaller than the outer diameter of the trachea nozzle, the air exhaust tube and the air pressure test connecting tube are respectively sleeved on the positions, corresponding to the trachea nozzle and located on the external thread, of the trachea nozzle through elastic deformation capacity of the air exhaust tube and the air pressure test connecting tube, and clamps used for fixing the air exhaust tube and the air pressure test connecting tube on the trachea nozzle are clamped and fixed on the trachea nozzle. Elastic rubber tube establishes the back on trachea mouthpiece at the cover, can extrude elastic rubber tube inner wall in the external screw thread through its elastic deformation's ability, and the gas tightness is higher like this, and the rethread clamp further improves the leakproofness.
Preferably, a handle is arranged in the middle of the top surface of the sealing cover, the handle is of a rectangular structure as a whole, and the long edge of one side of the handle is fixedly connected to the sealing cover.
The invention also discloses an accelerometer performance detection method, which comprises the following steps:
(1) the device for testing the dynamic performance of the accelerometer in the low-pressure environment is obtained, the sealing cover is opened, the quartz flexible accelerometer to be tested is placed in the inner cavity of the testing box, the quartz flexible accelerometer is electrically connected with the external accelerometer tester through the connecting plug, and the dynamic performance of the quartz flexible accelerometer under the standard atmospheric pressure is tested;
(2) covering the sealing cover on the test box, closing the inflation valve, starting the vacuum pump, vacuumizing the inner cavity of the test box, displaying the vacuum count value by observing the vacuum count value until the specified low air pressure is reached, closing the vacuum pump, and testing the dynamic performance of the quartz flexible accelerometer under the low air pressure after the air pressure in the inner cavity of the test box is stable and the stabilization time reaches the specified time;
(3) judging whether the meter head of the quartz flexible accelerometer has air leakage condition or not by comparing the consistency of the test results in the step (1) and the step (2);
(4) and opening the inflation valve, opening the sealing cover after the air pressure in the inner cavity of the test box is consistent with the atmospheric pressure, and taking out the quartz flexible accelerometer to finish the test operation.
In conclusion, the beneficial effects of the invention are as follows:
1. the invention adopts a simple and effective low-pressure test chamber, and can effectively and accurately test the dynamic performance parameters of the quartz flexible accelerometer under the low-pressure environment condition;
2. compared with the traditional low-pressure test chamber, the size of the test chamber body can be designed according to actual needs, small-batch tests can be performed, and the test efficiency is higher;
3. the device has low manufacturing cost, does not need special test places, and can be placed on a workbench for testing;
4. the invention can also be applied to low-pressure environment adaptability tests or low-pressure verification tests of small sensors, instruments and meters and the like. The invention has simple structure, quick and convenient installation and accurate and reliable test result.
Drawings
For purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made in detail to the present invention as illustrated in the accompanying drawings, in which:
FIG. 1 is a schematic three-dimensional structure of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in FIG. 1, the device for testing dynamic performance of an accelerometer under a low-pressure environment in the present embodiment comprises a testing box 1 having an open structure at an upper end, a sealing cover 2 is covered at the upper end of the testing box 1, the testing box 1 and the sealing cover 2 are sealed by a sealing ring 10, a connecting plug 3, an inflation valve 4, an air exhaust tube 5 and an air pressure testing connecting tube 6 are respectively arranged on a box body of the testing box, the connecting plug 3 is fixedly connected to an outer side surface of the testing box 1, a binding post in the connecting plug 3 penetrates through the testing box 1 and extends into the testing box 1, the binding post in the connecting plug 3 is in sealing fit with the testing box 1, the inflation valve 4 is installed on a side surface of the testing box 1 and is communicated with an inner cavity of the testing box 1, the air exhaust tube 5 and the air pressure testing connecting tube 6 are respectively fixedly connected to a side surface of the testing box 1 and are both communicated with the inner, the test box 1 is provided with accelerometer tester, vacuum pump and vacuum gauge outward, the incoming end of accelerometer tester with connect 3 plug-in connections of bayonet joint and with be connected the terminal electricity in the bayonet joint 3 and be connected, the end of bleeding of vacuum pump is connected with exhaust tube 5 and is used for carrying out evacuation processing to the test box 1 inner chamber, the vacuum gauge is installed on atmospheric pressure test connecting pipe 6 in order to be arranged in detecting the atmospheric pressure in the test box 1 inner chamber.
In this embodiment, set up respectively on 1 box of test box two with the connecting thread hole of 1 inner chamber intercommunication of test box, 1 outer and the position that corresponds connecting thread hole of test box is provided with trachea mouthpiece 7 respectively, and the one end threaded connection of trachea mouthpiece 7 is in connecting thread hole, and the coating has sealed glue on the contact surface between trachea mouthpiece 7 and the connecting thread hole, exhaust tube 5 with pneumatic test connecting pipe 6 suits respectively on its corresponding trachea mouthpiece 1.
In this embodiment, trachea nozzle 7 and its keep away from with follow its central line direction orientation on the one end pipe shaft that test box 1 is connected 1 direction extension of test box is provided with the external screw thread, exhaust tube 5 with atmospheric pressure test connecting pipe 6 is elastic rubber pipe and its internal diameter all is less than trachea nozzle 7's external diameter, exhaust tube 5 with atmospheric pressure test connecting pipe 6 overlaps respectively in order to establish through its elastic deformation ability and corresponds it just is located the position of external screw thread to be located trachea nozzle 7, the card is solid to be equipped with respectively on trachea nozzle 7 and is used for making exhaust tube 5 with clamp 8 that atmospheric pressure test connecting pipe 6 fixes on it.
In this embodiment, a handle 9 is disposed at a middle position of the top surface of the sealing cover 2, the handle 9 is a rectangular structure as a whole, and a long side of the handle is fixedly connected to the sealing cover 2.
In the specific implementation process, the central lines of the two connecting threaded holes are vertically arranged, so that the influence on the vacuum gauge is small when air is pumped.
An accelerometer performance detection method comprises the following steps:
(1) the device for testing the dynamic performance of the accelerometer in the low-pressure environment is obtained, the sealing cover 2 is opened, the quartz flexible accelerometer to be tested is placed in the inner cavity of the testing box 1, the quartz flexible accelerometer is electrically connected with the external accelerometer tester through the connecting plug 3, and the dynamic performance of the quartz flexible accelerometer under the standard atmospheric pressure is tested;
(2) covering the sealing cover 2 on the test box 1, closing the inflation valve 4, starting the vacuum pump, vacuumizing the inner cavity of the test box 1, displaying the vacuum count value by observing the vacuum count value until the specified low air pressure is reached, closing the vacuum pump, and testing the dynamic performance of the quartz flexible accelerometer under the low air pressure after the air pressure in the inner cavity of the test box 1 is stable and the stable time reaches the specified time;
(3) judging whether the meter head of the quartz flexible accelerometer has air leakage condition or not by comparing the consistency of the test results in the step (1) and the step (2);
(4) and opening the inflation valve 4, opening the sealing cover 2 after the air pressure in the inner cavity of the test box 1 is consistent with the external atmospheric pressure, and taking out the quartz flexible accelerometer to finish the test operation.
Finally, it is noted that the above-mentioned embodiments illustrate rather than limit the invention, and that, while the invention has been described with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (5)
1. The utility model provides an accelerometer dynamic behavior testing arrangement under low atmospheric pressure environment which characterized in that: the test box comprises a test box with an opening structure at the upper end, wherein the upper end cover of the test box is combined with a sealing cover, the test box and the sealing cover are sealed through a sealing ring, a connecting plug head, an inflation valve, an exhaust tube and a pneumatic test connecting tube are respectively arranged on a box body of the test box, the connecting plug head is fixedly connected on the outer side surface of the test box, a binding post in the connecting plug head penetrates through the test box and extends into the test box, the binding post in the connecting plug head is in sealing fit with the test box, the inflation valve is arranged on the side surface of the test box and is communicated with an inner cavity of the test box, the exhaust tube and the pneumatic test connecting tube are respectively and fixedly connected on the side surface of the test box and are communicated with the inner cavity of the test box, an accelerometer tester, a vacuum pump and a vacuum gauge are also arranged outside the test box, an access end of the accelerometer, the end of bleeding of vacuum pump is connected in order to be used for carrying out evacuation processing to the test box inner chamber with the exhaust tube, and the vacuometer is installed on atmospheric pressure test connecting pipe in order to be used for detecting the atmospheric pressure in the test box inner chamber.
2. The device for testing the dynamic performance of the accelerometer in the low-air-pressure environment according to claim 1, wherein: the test box is characterized in that two connecting threaded holes communicated with the inner cavity of the test box are respectively formed in the box body of the test box, the positions, corresponding to the connecting threaded holes, outside the test box are respectively provided with an air pipe nozzle, one end of the air pipe nozzle is in threaded connection with the connecting threaded holes, a sealing adhesive is coated on the contact surface between the air pipe nozzle and the connecting threaded holes, and the air exhaust pipe and the air pressure test connecting pipe are respectively sleeved on the corresponding air pipe nozzles.
3. The device for testing the dynamic performance of the accelerometer in the low-air-pressure environment according to claim 2, wherein: trachea mouthpiece and its keep away from with the one end pipe shaft that the test box is connected goes up along its central line direction orientation the test box direction is extended and is provided with the external screw thread, the exhaust tube with atmospheric pressure test connecting pipe is elastic rubber pipe and its internal diameter all is less than the external diameter of trachea mouthpiece, the exhaust tube with atmospheric pressure test connecting pipe overlaps respectively in order to establish through its elastic deformation ability and corresponds it just is located the position of external screw thread on the trachea mouthpiece, the card is solid to have on the trachea mouthpiece is used for making respectively the exhaust tube with the clamp that atmospheric pressure test connecting pipe was fixed on it.
4. The device for testing the dynamic performance of the accelerometer in the low-air-pressure environment according to claim 1, wherein: the middle position of the top surface of the sealing cover is provided with a handle, the handle is of a rectangular structure as a whole, and the long edge of one side of the handle is fixedly connected to the sealing cover.
5. A method for detecting dynamic performance of an accelerometer is characterized by comprising the following steps: the method comprises the following steps:
(1) the device for testing the dynamic performance of the accelerometer under the low-pressure environment of any one of claims 1 to 4 is obtained, the sealing cover is opened, the quartz flexible accelerometer to be tested is placed in the inner cavity of the testing box, the quartz flexible accelerometer is electrically connected with the external accelerometer tester through the connecting plug, and the dynamic performance of the quartz flexible accelerometer under the standard atmospheric pressure is tested;
(2) covering the sealing cover on the test box, closing the inflation valve, starting the vacuum pump, vacuumizing the inner cavity of the test box, displaying the vacuum count value until the specified low air pressure is reached by observing the vacuum count value, and testing the dynamic performance of the quartz flexible accelerometer under the low air pressure after the air pressure in the inner cavity of the test box is stable and the stabilization time reaches the specified time;
(3) judging whether the meter head of the quartz flexible accelerometer has air leakage condition or not by comparing the consistency of the test results in the step (1) and the step (2);
(4) and opening the inflation valve, opening the sealing cover after the air pressure in the inner cavity of the test box is consistent with the external atmospheric pressure, and taking out the quartz flexible accelerometer to finish the test operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911319368.3A CN110907661A (en) | 2019-12-19 | 2019-12-19 | Accelerometer dynamic performance testing device and method under low-pressure environment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911319368.3A CN110907661A (en) | 2019-12-19 | 2019-12-19 | Accelerometer dynamic performance testing device and method under low-pressure environment |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN113675702A (en) * | 2021-07-13 | 2021-11-19 | 北京无线电测量研究所 | Plug-pull mechanism |
| CN115575673A (en) * | 2022-11-11 | 2023-01-06 | 四川新川航空仪器有限责任公司 | Vacuum high-rotation-speed test platform and test method for tone wheel |
| CN117388527A (en) * | 2023-12-11 | 2024-01-12 | 保定开拓精密仪器制造有限责任公司 | Accelerometer air tightness detection system, method, device, terminal and storage medium |
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| CN117388527A (en) * | 2023-12-11 | 2024-01-12 | 保定开拓精密仪器制造有限责任公司 | Accelerometer air tightness detection system, method, device, terminal and storage medium |
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Application publication date: 20200324 |