CN108037316B - Apparatus and method for evaluating the reliability of accelerometers based on performance indicators - Google Patents

Abstract

The invention relates to a device and method for evaluating the reliability of an accelerometer based on performance indicators, and relates to the technical field of accelerometers. The device includes a test tool for installing an accelerometer and a positioning device for determining the position of the test tool. It includes a first mounting body and a second mounting body, the second mounting body is perpendicular to the first mounting body; the first mounting body is provided with mounting holes, and is detachably connected to the centrifuge through the mounting holes, the first mounting body and the second mounting body are The body is respectively provided with a first fixing hole, and is detachably connected with the accelerometer through the corresponding first fixing hole, the positioning device is provided with a positioning hole, and is detachably connected with the centrifuge through the positioning hole; by installing the accelerometer on the test tool , Do not disassemble the accelerometer during the whole reliability evaluation process, ensure that the change of performance index comes from the reliability test environment, and then evaluate the reliability of the accelerometer, and the operation is simple and convenient.

Description

Apparatus and method for evaluating the reliability of accelerometers based on performance indicators

technical field

The invention relates to the technical field of accelerometers, in particular to a device and method for evaluating the reliability of accelerometers based on performance indicators.

Background technique

Micro-mechanical accelerometers are made based on MEMS (Micro-Electro-Mechanical System, micro-mechanical system) processing technology, also known as MEMS accelerometers, which can be used to measure the acceleration information of moving carriers, and have been used in military, industrial, inertial navigation. , instrument testing, medicine and consumer electronics and other fields have been widely used.

The reliability of MEMS accelerometers, as an important assessment index, has become a key factor for its wide application; to evaluate the reliability of accelerometers, it is necessary to obtain performance indicators such as zero position and scale factor before and after the reliability test. Relative changes to evaluate and discover the reliability of MEMS accelerometers and their problems.

In the traditional technology, the test of the performance index of the accelerometer is mainly carried out through the gravity field, the indexing head and the centrifuge. In the above test methods, the accelerometer needs to be disassembled and installed, resulting in the installation stress and installation angle of the accelerometer on the centrifuge. The relative change of the performance index before and after the test is affected, so that the reliability of the accelerometer cannot be accurately evaluated by the relative change of the performance index of the accelerometer.

SUMMARY OF THE INVENTION

Based on the problem that the reliability of the accelerometer cannot be accurately evaluated, the present invention provides a device and method for evaluating the reliability of the accelerometer based on performance indicators.

An embodiment of the present invention provides a device for evaluating the reliability of an accelerometer based on a performance index, including a test fixture for installing an accelerometer and a positioning device for determining the position of the test fixture;

The test tool includes a first mounting body and a second mounting body, the second mounting body is perpendicular to the first mounting body;

The first installation body is provided with an installation hole, and is detachably connected to the centrifuge through the installation hole;

The first mounting body and the second mounting body are respectively provided with first fixing holes, and are detachably connected to the accelerometer through the corresponding first fixing holes;

The positioning device is provided with a positioning hole, and is detachably connected to the centrifuge through the positioning hole.

An embodiment of the present invention provides a method for evaluating the reliability of an accelerometer based on a performance index, comprising the following steps:

When the accelerometer is installed on the test fixture and powered on, the output voltage V ₁ of the accelerometer within a preset time is collected, and the noise parameters, zero noise parameters before the test of the accelerometer are obtained according to the output voltage V ₁ . Bit value and zero stability parameters;

When the test tool is removed from the centrifuge, put into the reliability test environment, and re-fixed to the centrifuge after the test, the output voltage V ₂ of the accelerometer within a preset time is collected, according to the output voltage V ₂ obtains the noise parameter, zero position value and zero position stability parameter after the accelerometer test;

A corresponding test difference value is obtained according to the noise parameter, zero position value and zero position stability parameter before and after the reliability test of the accelerometer, and the reliability of the accelerometer is evaluated according to the test difference value.

Accordingly, an embodiment of the present invention provides a device for evaluating the reliability of an accelerometer, including:

The zero position acquisition module before the test is used to collect the output voltage V 1 of the accelerometer within a preset time when the accelerometer is installed in the test fixture and is powered on, and obtains the output voltage V ₁ according to the output voltage V ₁ Noise parameters, zero value and zero stability parameters before the accelerometer test;

The zero position acquisition module after the test is used to collect the output of the accelerometer within a preset time when the test tool is removed from the centrifuge, put into the reliability test environment, and re-fixed to the centrifuge after the test voltage V ₂ , according to the output voltage V ₂ to obtain the noise parameter, zero position value and zero position stability parameter of the accelerometer after the test;

The zero-position test difference evaluation module is used to obtain the corresponding test difference value according to the noise parameter, zero position value and zero position stability parameter before and after the reliability test of the accelerometer, and evaluate the accelerometer according to the test difference value reliability.

Correspondingly, an embodiment of the present invention provides a storable medium on which a computer program is stored, and the program is executed by a processor to perform the steps of the above method.

The embodiment of the present invention also provides a method for evaluating the reliability of an accelerometer based on a performance index, comprising the following steps:

After the accelerometer is installed on the test fixture and powered on, the main centrifuge is controlled to rotate so that the input acceleration is a predetermined positive value with different values, and the output voltage V ₃ corresponding to the different values of the accelerometer is recorded; Describe the reverse rotation of the centrifuge so that the input acceleration is a predetermined negative value with different values, and record the output voltage V ₄ corresponding to the different values of the accelerometer; obtain from the output voltage V ₃ and the output voltage V ₄ the scale factor value, nonlinear parameter and range of the accelerometer before the test;

When the test tool is removed from the centrifuge, put into the reliability test environment, and re-fixed to the centrifuge after the test, the rotation of the main centrifuge is controlled so that the input acceleration is a predetermined positive value of different values, and the acceleration is recorded. Count the corresponding output voltage V ₅ under different numerical values; control the reverse rotation of the slave centrifuge to make the input acceleration be a predetermined negative value of different numerical values, and record the corresponding output voltage V ₆ under different numerical values of the accelerometer; The output voltage _V5 and the output voltage _V6 obtain the scale factor value, nonlinear parameter and range after the accelerometer test;

The corresponding test difference value is obtained according to the scale factor value, nonlinear parameter and range before and after the reliability test of the accelerometer, and the reliability of the accelerometer is evaluated according to the test difference value.

Correspondingly, an embodiment of the present invention provides a device for evaluating the reliability of an accelerometer based on a performance index, including:

The pre-test scale factor acquisition module is used to control the rotation of the main centrifuge so that the input acceleration is a predetermined positive value of different values when the accelerometer is installed in the test fixture and is powered on, and records the different values of the accelerometer. The corresponding output voltage V ₃ ; control the reverse rotation of the slave centrifuge so that the input acceleration is a predetermined negative value with different values, and record the output voltage V ₄ corresponding to the different values of the accelerometer; according to the output voltage _V3 and the output voltage _V4 obtain the scale factor value, nonlinear parameter and range before the accelerometer test;

After the test, the scale factor acquisition module is used to control the rotation of the main centrifuge to make the input acceleration different when the test tool is removed from the centrifuge and put into the reliability test environment, and is re-fixed to the centrifuge after the test. The predetermined positive value of the numerical value, record the output voltage _V5 corresponding to the different numerical values of the accelerometer; control the reverse rotation of the slave centrifuge to make the input acceleration be the predetermined negative value of the different numerical value, and record the different numerical values of the accelerometer the corresponding output voltage V ₆ under the accelerometer; according to the output voltage V ₅ and the output voltage V ₆ to obtain the scale factor value, nonlinear parameter and range of the accelerometer after the test;

The scale factor test difference value evaluation module is used to obtain the corresponding test difference value according to the scale factor value, nonlinear parameter and range before and after the reliability test of the accelerometer, and evaluate the accelerometer according to the test difference value. reliability.

Correspondingly, an embodiment of the present invention provides a storable medium on which a computer program is stored, and the program is executed by a processor to perform the steps of the above method.

A technical scheme in the above-mentioned technical scheme has the following advantages and beneficial effects:

By installing the accelerometer on the test tool, the test tool is fixed on the centrifuge, and the position of the test tool on the centrifuge is determined by the positioning device, so that the accelerometer is not disassembled during the whole reliability evaluation process, so as to ensure the installation stress, The installation angle and installation position remain unchanged, so as to determine that the change of performance index comes from the reliability test environment, and then evaluate and discover the reliability and problems of the accelerometer, and the operation is simple and convenient.

Description of drawings

1 is an application environment diagram for evaluating the reliability of an accelerometer based on performance indicators in an embodiment of the present invention;

2 is a schematic structural diagram of a device for evaluating the reliability of an accelerometer based on performance indicators in an embodiment of the present invention;

Fig. 3 is the structural representation of the test tool in the embodiment of the present invention;

4 is a schematic structural diagram of a positioning device in an embodiment of the present invention;

5 is a first flowchart of a method for evaluating the reliability of an accelerometer based on a performance index in an embodiment of the present invention;

FIG. 6 is a first schematic diagram of an apparatus for evaluating the reliability of an accelerometer based on a performance index according to an embodiment of the present invention

7 is a second flowchart of a method for evaluating the reliability of an accelerometer based on a performance index in an embodiment of the present invention;

8 is a schematic diagram of batch testing of accelerometers in an embodiment of the present invention;

FIG. 9 is an enlarged view of batch testing of accelerometers in the embodiment of FIG. 8;

FIG. 10 is a second schematic diagram of a device for evaluating the reliability of an accelerometer based on a performance index according to an embodiment of the present invention;

Reference number:

1-Test tooling

11-First mounting body 12-Second mounting body 130-Installation hole 140-First fixing hole

2-Positioning device 21-Positioning hole

3-Accelerometer 4-Centrifuge

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the following embodiments and the accompanying drawings will further describe the device and method for evaluating the reliability of an accelerometer based on performance indicators of the present invention.

It should be understood that unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terms used herein in the description of the present invention are only for describing specific embodiments, and are not intended to limit the present invention.

The embodiments of the device and method for evaluating the reliability of an accelerometer based on performance indicators of the present invention can complete the test of the zero position and scale factor of the MEMS accelerometer based on the linear acceleration turntable of the double centrifuge, and relate to the working principle of the linear acceleration turntable of the double centrifuge, as follows The application scenarios of accelerometers in centrifuges are introduced.

As shown in Figure 1, the double centrifuge linear acceleration turntable is composed of a master centrifuge and a slave centrifuge, and the acceleration signal generated by it can be used as an input to calibrate and calibrate the accelerometer. The slave centrifuge is symmetrically installed on the turntable or rotating arm of the master centrifuge. The working surfaces of the master centrifuge and the slave centrifuge are parallel to the ground, and the rotation axis is perpendicular to the ground.

The calibrated accelerometer is installed on the table of the slave centrifuge, so that the sensitive axis of the accelerometer is on the connecting line between the center of the master centrifuge and the center of the slave centrifuge. The constant rotation of the main centrifuge generates a certain centrifugal acceleration to input the acceleration to the accelerometer, and the input acceleration in this direction is set to a positive value; when the secondary centrifuge rotates 180°, the accelerometer inputs the acceleration in the opposite direction, and the input acceleration in this direction is set to negative value.

In the traditional technology, the accelerometer is directly removed from the centrifuge turntable and put into the reliability test environment. After the reliability test is completed, the accelerometer is reinstalled on the centrifuge turntable to test the performance of the accelerometer zero position and scale factor. By comparing the performance indicators before and after the reliability test, the relative changes are affected by the disassembly and installation of the accelerometer, so the reliability of the accelerometer cannot be accurately evaluated.

Among them, reliability test refers to the general term of various tests for understanding, evaluating, analyzing and improving the reliability of accelerometers. Various test environments include high temperature, low temperature, vibration and shock; the purpose of reliability test is: Various defects in the design, material and process of the accelerometer were found, and after analysis and improvement, the reliability of the product was gradually increased, and finally reached the predetermined reliability level; in order to improve the combat readiness of the accelerometer and improve the mission success rate 3. Provide information to reduce maintenance and support costs; confirm whether it meets the specified quantitative requirements for reliability.

To this end, an embodiment of the present invention provides a device for evaluating the reliability of an accelerometer based on a performance index, as shown in FIG. 2 , including a test fixture 1 for installing the accelerometer and a positioning device 2 for determining the position of the test fixture ; The test tool 1 includes a first mounting body 11 and a second mounting body 12, the second mounting body 12 is perpendicular to the first mounting body 11; the first mounting body 11 is provided with a mounting hole 130, and the centrifuge 4 Removable connection; the first mounting body 11 and the second mounting body 12 are respectively provided with a first fixing hole 140, and are detachably connected with the accelerometer 3 through the corresponding first fixing hole 140; the positioning device 2 is provided with a positioning hole 21, And it is detachably connected with the centrifuge 4 through the positioning hole 21 .

In this embodiment, the second mounting body 12 in the test fixture 1 is used to connect with the accelerometer 3 of the vertical sensitive axis through the first fixing hole 140 thereof. Before putting the accelerometer 3 into the reliability test environment, The test fixture 1 of the accelerometer 3 is disassembled. At this time, the position of the accelerometer 3 in the test fixture 1 remains unchanged, which eliminates the change of the installation stress of the accelerometer 3 . Similarly, the first mounting body 11 in the test fixture 1 is used to connect with the accelerometer 3 of the horizontal sensitive axis through its first fixing hole 140 (not shown in FIG. 2 ), which eliminates the change of the installation stress of the accelerometer 3 .

It should be noted that, in order to realize the test of the accelerometer 3 of the horizontal sensitive axis and the accelerometer 3 of the vertical sensitive axis, the first mounting body 11 and the second mounting body 12 of the device provided by each embodiment of the present invention are respectively provided with a first mounting body 11 and a second mounting body 12. The fixing hole 140, but in practice, as shown in FIG. 3, the first fixing hole 140 is provided on the first mounting body 11 or the second mounting body 12 alone, all of which are under the premise of not departing from the concept of the present invention. Several modifications and improvements are made, which all belong to the protection scope of the present invention.

In this embodiment, the test tool 1 is detachably connected to the centrifuge 4 through the installation hole 130, and the performance index of the accelerometer 3 before and after the reliability test can be tested under the condition that the position of the accelerometer 3 remains unchanged; The machine 4 is provided with a second fixing hole matched with the mounting hole 130 .

It should be understood that the positioning device 2 is used to determine the position of the test fixture 1 to ensure that the test fixture 1 is in the same position before disassembly and after installation. Because the accelerometer 3 is not removed from the test fixture 1 during the test process, it can prevent The installation angle and installation position have changed.

Specifically, as shown in FIG. 2 , the centrifuge 4 is provided with a third fixing hole matched with the positioning hole 21 . The third fixing hole can ensure that the position of the positioning device 2 in the centrifuge 4 remains unchanged, and the test tool 1 is along the positioning device. 2. The inner side is fitted and installed to ensure that the position of the test tool 1 in the centrifuge 4 remains unchanged.

It should be noted that the centrifuge 4 is detachably connected to the positioning device 2 through the third fixing hole, and is detachably connected to the test tool 1 through the second fixing hole. Obviously, the second fixing hole and the third fixing hole are in the centrifuge 4. The position is used as a reference for the positioning device 2 to determine the position of the test tool 1 .

As mentioned above, by installing the accelerometer 3 on the test fixture 1, the test fixture 1 is fixed on the centrifuge 4, and the position of the test fixture 1 on the centrifuge 4 is determined by the positioning device 2; Do not disassemble the accelerometer 3 to ensure that the installation stress, installation angle and installation position of the accelerometer 3 remain unchanged, so as to determine that the changes in performance indicators originate from the reliability test environment, and then evaluate and discover the reliability of the accelerometer 3 and its problems. Operation easy and convenient.

In one embodiment, the first mounting body 11 and the second mounting body 12 are detachably connected to each accelerometer 3 through corresponding sets of first fixing holes 140 respectively.

It should be understood that, as shown in FIG. 2 , the second mounting body 12 is provided with n first fixing holes 140 , there are p accelerometers 3 , and the number of each group of first fixing holes 140 corresponding to each accelerometer 3 is m , then n≥p×m; for example, the number n of the first fixing holes 140 is 24, the number p of the accelerometers 3 is 6, and the number m of each group of the first fixing holes 140 corresponding to each accelerometer 3 is 4.

As described above, a plurality of accelerometers 3 can be installed on the test fixture 1 in the test device for batch evaluation, thereby improving the evaluation efficiency.

In one embodiment, the first mounting body 11 and the second mounting body 12 are integrally formed to prevent errors in the reliability test environment and the performance index testing process of the first mounting body 11 and the second mounting body 12 .

In one embodiment, as shown in FIG. 4 , the included angle of the positioning device 2 is 90 degrees.

In this embodiment, the positioning device 2 is installed on the centrifuge 4 and then fixed on it. Each time the accelerometer 3 is tested, the test tool 1 is fitted and installed along the two right-angled edges inside the positioning device 2 , the angle between the two sides of the first mounting body 11 in the test fixture 1 matches the 90-degree angle of the positioning device 2, which can ensure that the installation angle and installation position of the test sample remain unchanged during each test installation.

It should be noted that, in each embodiment of the present invention, the positioning device 2 is used to determine the position of the test tool 1. Obviously, the test tool 1 and the positioning device 2 can cooperate to play the above-mentioned functions, and are not limited to the clamp of the positioning device 2. The angle is 90 degrees. For example, the first mounting body 11 of the test tool 1 has a circular shape in plan view, and the included angle of the positioning device 2 is 60 degrees.

In one embodiment, the mounting holes 130 are located at the edge of the first mounting body 11 , and the number of the mounting holes 130 is plural.

It should be noted that the mounting hole 130 is located at the edge of the first mounting body 11 , which is far from the center of the first mounting body 11 and can better fix the test tool 1 ; obviously, multiple mounting holes 130 are required to test the The tooling 1 is fixed to the centrifuge 4 .

In one embodiment, it further includes a first bolt, the first fixing hole 140 is a first screw hole, the accelerometer 3 is provided with a through hole that is matched with the first fixing hole 140 , and the first bolt passes through the through hole and is connected to the first screw hole. hole fit.

In one embodiment, it further includes a second bolt, the centrifuge 4 is provided with a second fixing hole matched with the installation hole 130 , the second fixing hole is a second screw hole, and the second bolt passes through the installation hole 130 and the second screw hole fit.

It should be noted that there are various detachable connection methods in the above-mentioned embodiments, including threaded connection and snap connection. Without departing from the concept of the present invention, the deformation and improvement of the connection method are all detachable. within the range of the connection.

The embodiment of the present invention also provides a method for evaluating the reliability of an accelerometer based on a performance index, as shown in FIG. 5 , including the following steps:

S510 : when the accelerometer 3 is installed in the test fixture 1 and is powered on, collect the output voltage V ₁ of the accelerometer 3 within a preset time, and obtain the noise parameters and zero value of the accelerometer 3 before the test according to the output voltage V ₁ and zero stability parameters.

Among them, the accelerometer 3 is installed on the test fixture 1, the accelerometer 3 for the horizontal sensitive axis is installed on the first mounting body 11 of the test fixture 1, and the accelerometer 3 for the vertical sensitive axis is installed on the second test fixture 1. On the mounting body 12 ; the test tool 1 with the accelerometer 3 is fixed to the centrifuge 4 through the first fixing hole 140 , and the positioning device 2 is fixed to the centrifuge 4 through the positioning hole 21 .

The power-on operation refers to connecting a stable power supply to the accelerometer 3 .

The predetermined time in this embodiment can be customized, such as 1 hour.

S520: When the test tool 1 is removed from the centrifuge 4 and put into the reliability test environment, and is re-fixed to the centrifuge after the test, the output voltage V ₂ of the accelerometer 3 within a preset time is collected, according to the output voltage V ₂ obtains the noise parameters, zero value and zero stability parameters of the accelerometer after the 3 test.

Wherein, after the accelerometer 3 is installed on the test fixture 1, in the test of this step and the previous reliability test, the accelerometer 3 is installed on the test fixture 1, and only the test fixture 1 is disassembled without disassembly.

S530: Obtain a corresponding test difference value according to the noise parameter, zero position value and zero position stability parameter before and after the reliability test of the accelerometer, and evaluate the reliability of the accelerometer 3 according to the test difference value.

Obviously, the installation force in the process of disassembly and re-fixation only acts on the test fixture 1, and does not directly act on the accelerometer 3, which avoids the influence of the installation force on the accelerometer 3, and ensures that the entire reliability test environment and performance indicators are During the test, the magnitude of the installation stress of the accelerometer 3 remains unchanged.

At the same time, the function of the positioning device 2 is to determine the position of the test tool 1, install the positioning device 2 on the centrifuge 4 and fix it on it, and make the test tool 1 along the The inner angle of the positioning device 2 is fitted and installed to ensure that the installation angle and installation position of the accelerometer 3 remain unchanged during each test.

In one embodiment, the step of obtaining the noise parameters of the accelerometer ₃ before the test according to the output voltage V1 includes:

The output voltage of the preset duration is intercepted, the variance value of the output voltage is obtained, and the ratio of the variance value to the scale factor is obtained, and the ratio is determined as the noise parameter.

Optionally, the preset duration of the noise indicator is 10 seconds.

In one embodiment, the step of obtaining the zero value of the accelerometer 3 before the test according to the output voltage V ₁ of the accelerometer 3 includes:

Intercept the output voltage for a preset duration, obtain the average value of the output voltage, obtain the ratio of the average value to the scale factor, and determine the ratio as a zero-bit value.

Optionally, the preset duration of the zero value is equal to a predetermined time, such as 1 hour.

In one embodiment, the step of obtaining the zero-position stability parameter of the accelerometer 3 before the reliability test according to the output voltage V ₁ of the accelerometer 3 includes:

The output voltage of the preset duration is intercepted, the variance value of the output voltage is obtained, and the ratio of the variance value to the scale factor is obtained, and the ratio is determined as a zero-bit stability parameter.

Optionally, the preset duration of the zero-position stability parameter is equal to a predetermined time, such as 1 hour.

It should be noted that, in step S520, the specific implementation of acquiring the noise parameter, zero value and zero stability parameter of the accelerometer 3 after the test according to the output voltage V ₂ of the accelerometer 3 is consistent with the above.

In the traditional technology, in the process of testing the zero value of the accelerometer 3, since the accelerometer 3 is sensitive to stress and the existence of gravitational acceleration, the change of the installation force and the installation angle will cause the change of the zero position of the accelerometer 3. It will bring errors to the test of the zero position; at the same time, during the test of the zero position stability of the accelerometer 3, since the accelerometer 3 is sensitive to stress, the change of the installation force will cause the change of the zero position stability of the accelerometer 3 , which brings errors to the test of zero stability.

In the embodiment of the present invention, the performance index test and reliability test are performed on the accelerometer 3 installed in the test fixture 1 to ensure that the installation stress, installation angle and installation position of the accelerometer 3 remain unchanged. According to the noise before and after the reliability test The test difference of the parameters, the zero position value and the zero position stability parameter can evaluate and find the reliability of the accelerometer 3 and its problems, and the operation is simple and convenient.

In one embodiment, the test fixture 1 has multiple sets of first fixing holes 140 , the output voltage of the zero-position-related performance index of the accelerometer 3 belongs to static collection, and the multiple sets of first fixing holes 140 of the test fixture 1 correspond to multiple accelerometers 3. Batch testing can be carried out, thereby improving the evaluation efficiency and reducing the cost.

Correspondingly, an embodiment of the present invention also provides a device for evaluating the reliability of an accelerometer based on a performance index, as shown in FIG. 6 , including:

The zero position acquisition module 610 before the test is used to collect the output voltage V ₁ of the accelerometer 3 within a preset time when the accelerometer 3 is installed in the test fixture 1 and is powered on, and obtains the test of the accelerometer 3 according to the output voltage V ₁ The previous noise parameters, null value and null stability parameters;

The zero position acquisition module 620 after the test is used to collect the accelerometer 3 within a preset time when the test tool 1 is removed from the centrifuge 4 and put into the reliability test environment, and is re-fixed to the centrifuge 4 after the test is over According to the output voltage V ₂ of the accelerometer 3, the noise parameters, zero position value and zero position stability parameters after the test of the accelerometer ₃ are obtained;

The zero position test difference evaluation module 630 is used to obtain the corresponding test difference value according to the noise parameters, zero position value and zero position stability parameter before and after the accelerometer reliability test, and evaluate the reliability of the accelerometer 3 according to the test difference value.

The above-mentioned device for evaluating the reliability of an accelerometer based on a performance index can execute the method for evaluating the reliability of an accelerometer based on a performance index provided by the embodiments of the present invention, and has functional modules and beneficial effects corresponding to the execution method.

In addition, those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be implemented by instructing relevant hardware through a computer program, and the program can be stored in a non-volatile computer-readable In the storage medium, as in the embodiment of the present invention, the program may be stored in the storage medium of the computer system and executed by at least one processor in the computer system, so as to realize the evaluation method including the reliability of each accelerometer as described above. flow of an example.

In one embodiment, a storage medium is also provided, on which a computer program is stored, wherein when the program is executed by the processor, any one of the methods for evaluating the reliability of the accelerometer in the foregoing embodiments is implemented. The storage medium may be a magnetic disk, an optical disk, a read-only memory (Read-Only Memory, ROM), or a random access memory (Random Access Memory, RAM) or the like.

The computer storage medium, and the computer program stored in the computer storage medium, realizes the process including the embodiments of the above-mentioned methods for evaluating the reliability of each accelerometer, thereby realizing that the change of the performance index comes from the reliability test environment, and then evaluating and discovering the acceleration The reliability of the meter and its problems; at the same time, the device can be used to complete the test of the performance index without other instruments, and the operation is simple and convenient.

The embodiment of the present invention also provides a method for evaluating the reliability of an accelerometer based on a performance index, as shown in FIG. 7 , including the following steps:

S710: when the accelerometer 3 is installed in the test fixture 1 and is powered on, control the rotation of the main centrifuge so that the input acceleration is a predetermined positive value with different values, and record the output voltage V _{3 corresponding to the different values of the accelerometer 3} ; control Reverse rotation from the centrifuge to make the input acceleration a predetermined negative value of different values, record the output voltage V4 corresponding to the different values of the accelerometer ₃ ; obtain the accelerometer 3 before the test according to the output voltage _V3 and the output voltage _V4 Scale factor values, nonlinear parameters and ranges;

Among them, the accelerometer 3 is installed on the test fixture 1, the accelerometer 3 for the horizontal sensitive axis is installed on the first mounting body 11 of the test fixture 1, and the accelerometer 3 for the vertical sensitive axis is installed on the second test fixture 1. On the mounting body 12 ; the test tool 1 with the accelerometer 3 is fixed to the centrifuge 4 through the first fixing hole 140 , and the positioning device 2 is fixed to the centrifuge 4 through the positioning hole 21 .

The power-on operation refers to connecting a stable power supply to the accelerometer 3 .

In this embodiment, the centrifugal acceleration generated by the centrifuge 4 is used as the input of the accelerometer 3. First, the rotation of the main centrifuge is controlled so that the input acceleration is a predetermined positive value of different values; so that the input acceleration is a predetermined negative value of a different value.

S720: When the test tool 1 is removed from the centrifuge 4 and put into the reliability test environment, and is re-fixed to the centrifuge 4 after the test, the rotation of the main centrifuge is controlled so that the input acceleration is a predetermined positive value with different values, Record the corresponding output voltage V ₅ under different numerical values of the accelerometer 3; control the reverse rotation from the centrifuge to make the input acceleration be a predetermined negative value of different numerical values, and record the corresponding output voltage V ₆ under the different numerical values of the accelerometer 3; The output voltage V ₅ and the output voltage V ₆ obtain the scale factor values, nonlinear parameters and ranges of the accelerometer 3 after the test.

Among them, after the accelerometer 3 is installed on the test fixture 1, in the test of this step and the previous reliability test, the accelerometer 3 is installed on the test fixture 1, and only the test fixture 1 is disassembled, so as to ensure The accelerometer mounting stress remains unchanged.

S730: Obtain a corresponding test difference value according to the scale factor value, nonlinear parameter and range before and after the reliability test of the accelerometer, and evaluate the reliability of the accelerometer 3 according to the test difference value.

Obviously, the installation force in the process of disassembly and re-fixation only acts on the test fixture 1, and does not directly act on the accelerometer 3, which avoids the influence of the installation force on the accelerometer 3, and ensures that the entire reliability test environment and performance indicators are During the test, the magnitude of the installation stress of the accelerometer 3 remains unchanged.

At the same time, the function of the positioning device 2 is to determine the position of the test tool 1, install the positioning device 2 on the centrifuge 4 and fix it on it, and make the test tool 1 along the The inner angle of the positioning device 2 is fitted and installed to ensure that the installation angle and installation position of the accelerometer 3 remain unchanged during each test.

In one embodiment, the step of obtaining the scale factor value of the accelerometer 3 before the test according to the output voltage _V3 and the output voltage _V4 includes:

Record the output voltage corresponding to the input acceleration of the accelerometer 3 at different values; take the input acceleration as the abscissa, and the average value of the output voltages V ₃ and V ₄ as the ordinate, and perform linear fitting; The first-order coefficient is determined as the scale factor value of the accelerometer 3 .

In one embodiment, the step of obtaining the nonlinear index of the accelerometer 3 before the test according to the output voltage _V3 and the output voltage _V4 includes:

Record the output voltage corresponding to the input acceleration of the accelerometer 3 at different values; take the input acceleration as the abscissa, and the average value of the output voltages _V3 and _V4 as the ordinate, and perform linear fitting; identify the output voltage that deviates from the fitted straight line The maximum difference; the maximum difference is determined as the nonlinear index.

In one embodiment, the step of obtaining the range of the accelerometer 3 before the test according to the output voltage V ₃ and the output voltage V ₄ includes:

Control the rotation of the centrifuge 4 so that the input acceleration is a predetermined positive value or a predetermined negative value of acceleration of different values, and determine that each actual output voltage obtained is consistent with the predicted output voltage. If so, identify the maximum input acceleration, and determine the maximum input acceleration as Accelerometer 3 range.

In one embodiment, the acceleration of gravity is abbreviated as g, and the unit is 9.8 m/s ² , and the predetermined positive values for different values are 1 g, 2 g, 5 g, 10 g, 15 g, 20 g, 25 g and 30 g, respectively.

It should be noted that the specific implementation of obtaining the scale factor value, nonlinear parameter and range of the accelerometer 3 after the test according to the output voltages V ₃ and V ₄ of the accelerometer 3 in step S720 is consistent with the above.

In the conventional technology, in the process of testing the value of the scale factor of the accelerometer 3, since the accelerometer 3 is sensitive to stress and the test of the scale factor is closely related to the input acceleration. In addition, even if there is a screw positioning hole 21, since the size of the through hole is larger than that of the screw, the installation angle and installation position of each installation cannot be consistent. Therefore, the installation force, installation angle and installation position brought by reinstallation are different. Changes will cause changes in the scale factor of the accelerometer 3, which will bring errors to the test.

In the embodiment of the present invention, the performance index test and reliability test are performed on the accelerometer 3 installed on the test fixture 1 to ensure that the installation stress, installation angle and installation position of the accelerometer 3 remain unchanged. The reliability of the accelerometer 3 and its problems can be evaluated and found due to the test difference of numerical values, nonlinear parameters and ranges, and the operation is simple and convenient.

In one embodiment, as shown in FIG. 2 , there are multiple accelerometers 3 installed on the test fixture 1 .

The present embodiment relates to the principle of batch testing of the scale factor, nonlinearity and range of the accelerometer 3 by the centrifuge 4 . FIGS. 8 and 9 are schematic diagrams of batch testing of the accelerometer 3 .

As shown in Figure 8 and Figure 9, the multiple accelerometers 3 installed on the test fixture 1 are arranged in sequence on the vertical line connecting the rotation centers of the master and slave centrifuges, and the input accelerations of the accelerometer m and accelerometer n are now derived. relation.

Assuming that the accelerometer m is on the connection line between the master and the slave centrifuge, the distance between the center of the mass block and the rotation center of the master centrifuge is r ₁ , and the rotation angular rate of the master centrifuge is ω, the input acceleration a ₁ of the accelerometer m is:

a ₁ =ω ² ·r ₁

Among them, the distance between the center of the mass block of the accelerometer n and the rotation center of the main centrifuge is r ₂ , and the input acceleration a′ ₂ of the accelerometer n along the centrifugal acceleration direction is:

a′ ₂ =ω ² ·r ₂

Obviously, since the centrifugal acceleration and the sensitive direction of the accelerometer n form an angle θ, the actual input acceleration a of the accelerometer n is _:

a ₂ =a' ₂ ·cosθ=ω ² ·r ₂ ·cosθ=ω ² ·r ₁ =a ₁

It can be seen that the input acceleration of the accelerometer n is equal to that of the accelerometer m, indicating that the input accelerations arranged on the vertical line connecting the rotation centers of the master and slave centrifuges are all equal, so the test device of the present invention can realize the accelerometer 3 batch tests.

As described above, a plurality of accelerometers 3 are installed in the test fixture 1, and the input acceleration of each accelerometer 3 is equal, so that batch testing can be performed, thereby improving testing efficiency and reducing costs.

In one embodiment, when the accelerometer 3 is installed in the test fixture 1 and is powered on, the output voltage V ₁ of the accelerometer 3 is collected within a preset time, and the noise parameters of the accelerometer 3 before the test are obtained according to the output voltage V ₁ , zero value and zero stability parameters;

Control the rotation of the main centrifuge so that the input acceleration is a predetermined positive value with different values, and record the output voltage V ₃ corresponding to the different values of the accelerometer 3; control the reverse rotation of the slave centrifuge so that the input acceleration is a predetermined negative value with different values , record the output voltage V ₄ corresponding to different values of the accelerometer 3; obtain the scale factor value, nonlinear parameter and range of the accelerometer 3 before the test according to the output voltage V ₃ and the output voltage V ₄ ;

When the test tool 1 is removed from the centrifuge 4 and put into the reliability test environment, and is re-fixed to the centrifuge after the test, the output voltage V ₂ of the accelerometer 3 within the preset time is collected, according to the output voltage V ₂ Obtain the noise parameters, zero value and zero stability parameters after the accelerometer 3 test;

Control the rotation of the main centrifuge so that the input acceleration is a predetermined positive value of different numerical values, and record the corresponding output voltage V5 under different numerical values of the accelerometer ₃ ; control the reverse rotation of the slave centrifuge to make the input acceleration be a predetermined negative value of different numerical values , record the output voltage V ₆ corresponding to different values of the accelerometer 3; obtain the scale factor value, nonlinear parameter and range of the accelerometer 3 after the test according to the output voltage V ₅ and the output voltage V ₆ ;

According to the noise parameter, zero value, zero stability parameter, scale factor value, nonlinear parameter and range before and after the reliability test of the accelerometer, the corresponding test difference is obtained, and the reliability of the accelerometer 3 is evaluated according to the test difference.

It should be noted that the above two methods for evaluating the reliability of accelerometers are based on different types of performance indicators. For those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and Improvements, all of which belong to the protection scope of the present invention, such as combining the above two different types of performance indicators to comprehensively evaluate the reliability of the accelerometer.

Correspondingly, an embodiment of the present invention also provides a device for evaluating the reliability of an accelerometer based on a performance index, as shown in FIG. 10 , including:

The scale factor acquisition module 101 before the test is used to control the rotation of the main centrifuge to make the input acceleration be a predetermined positive value of different values when the accelerometer 3 is installed in the test fixture 1 and is powered on, and records the different values of the accelerometer 3. The corresponding output voltage V ₃ ; control the reverse rotation from the centrifuge to make the input acceleration a predetermined negative value with different values, and record the corresponding output voltage V ₄ under different values of the accelerometer 3; according to the output voltage V ₃ and the output voltage V ₄ obtains the scale factor value, nonlinear parameter and range of the accelerometer 3 before the test;

The scale factor acquisition module 102 after the test is used to control the rotation of the main centrifuge to make the input The acceleration is a predetermined positive value of different numerical values, and the corresponding output voltage V ₅ under the different numerical values of the accelerometer 3 is recorded; the reverse rotation from the centrifuge is controlled so that the input acceleration is a predetermined negative value of different numerical values, and the corresponding output voltage V 5 of the accelerometer 3 is recorded under different numerical values. Corresponding output voltage V ₆ ; obtain the scale factor value, nonlinear parameter and range of the accelerometer 3 after the test according to the output voltage V ₅ and the output voltage V ₆ ;

The scale factor test difference evaluation module 103 is used to obtain the corresponding test difference value according to the scale factor value, nonlinear parameter and range before and after the accelerometer reliability test, and evaluate the reliability of the accelerometer 3 according to the test difference value.

The above-mentioned device for evaluating the reliability of an accelerometer based on a performance index can execute the method for evaluating the reliability of an accelerometer based on a performance index provided by the embodiments of the present invention, and has functional modules and beneficial effects corresponding to the execution method.

In addition, those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be implemented by instructing relevant hardware through a computer program, and the program can be stored in a non-volatile computer-readable In the storage medium, as in the embodiment of the present invention, the program may be stored in the storage medium of the computer system and executed by at least one processor in the computer system, so as to realize the evaluation method including the reliability of each accelerometer as described above. flow of an example.

In one embodiment, a storage medium is also provided, on which a computer program is stored, wherein when the program is executed by the processor, any one of the methods for evaluating the reliability of the accelerometer in the foregoing embodiments is implemented. The storage medium may be a magnetic disk, an optical disk, a read-only memory (Read-Only Memory, ROM), or a random access memory (Random Access Memory, RAM) or the like.

The computer storage medium, and the computer program stored in the computer storage medium, realizes the process including the embodiments of the above-mentioned methods for evaluating the reliability of each accelerometer, thereby realizing that the change of the performance index comes from the reliability test environment, and then evaluating and discovering the acceleration The reliability of the meter and its problems, the operation is simple and convenient.

The above-mentioned embodiments only represent several embodiments of the present invention, and the descriptions thereof are specific and detailed, but should not be construed as a limitation on the scope of the patent of the present invention. It should be pointed out that for those skilled in the art, without departing from the concept of the present invention, several modifications and improvements can be made, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims (10)

1. The equipment for evaluating the reliability of the accelerometer based on the performance indexes is characterized by comprising a test tool for mounting the accelerometer and a positioning device for determining the position of the test tool; the test tool is attached and installed along the inner side of the positioning device;

the test tool comprises a first mounting body and a second mounting body, and the second mounting body is perpendicular to the first mounting body;

the first mounting body is provided with a mounting hole and is detachably connected with the centrifugal machine through the mounting hole;

the first mounting body and the second mounting body are respectively provided with a first fixing hole and are detachably connected with the accelerometer through the corresponding first fixing holes;

the positioning device is provided with a positioning hole and is detachably connected with the centrifugal machine through the positioning hole.

2. The apparatus of claim 1, wherein the first mounting member and the second mounting member are detachably connected to the accelerometers through the corresponding sets of the first fixing holes, respectively.

3. The apparatus for assessing reliability of an accelerometer according to claim 1 or 2, further comprising a first bolt;

the first fixing hole is a first screw hole, the accelerometer is provided with a through hole matched with the first fixing hole, and the first bolt penetrates through the through hole to be matched with the first screw hole.

4. The apparatus for assessing reliability of an accelerometer according to claim 1 or 2, further comprising a second bolt;

the centrifugal machine is provided with a second fixing hole matched with the mounting hole;

the second fixing hole is a second screw hole, and the second bolt penetrates through the mounting hole to be matched with the second screw hole.

5. An evaluation method based on the device of any one of claims 1 to 4, comprising the steps of:

when the accelerometer is installed in the test tool and powered on to work, the output voltage V of the accelerometer in preset time is collected₁According to said output voltage V₁Acquiring a noise parameter, a zero value and a zero stability parameter before the accelerometer test;

when the test tool is detached from the centrifuge and put into a reliability test environment and is fixed on the centrifuge again after the test is finished, acquiring the output voltage V of the accelerometer within a preset time₂According to said output voltage V₂Acquiring a noise parameter, a zero value and a zero stability parameter after the accelerometer test;

and acquiring corresponding test difference values according to the noise parameters, the zero value and the zero position stability parameters before and after the accelerometer reliability test, and evaluating the reliability of the accelerometer according to the test difference values.

6. An evaluation apparatus based on the evaluation method of claim 5, comprising:

the test pre-zero acquisition module is used for acquiring the output voltage V of the accelerometer within preset time when the accelerometer is installed in the test tool and powered on to work₁According to said output voltage V₁Acquiring a noise parameter, a zero value and a zero stability parameter before the accelerometer test;

the post-test zero-position acquisition module is used for acquiring the output voltage V of the accelerometer within the preset time when the test tool is detached from the centrifuge and put into a reliability test environment and is fixed on the centrifuge again after the test is finished₂According to said output voltage V₂Acquiring a noise parameter, a zero value and a zero stability parameter after the accelerometer test;

and the zero position test difference evaluation module is used for acquiring corresponding test differences according to the noise parameters, the zero value and the zero position stability parameters before and after the reliability test of the accelerometer, and evaluating the reliability of the accelerometer according to the test differences.

7. A storable medium having stored thereon a computer program, characterised in that the program is adapted to be executed by a processor for performing the steps of the method as claimed in claim 5.

8. An evaluation method based on the device of any one of claims 1 to 4, comprising the steps of:

when the accelerometer is installed on the test tool and powered on to work, the main centrifugal machine is controlled to rotate so that the input acceleration is a preset positive value of different values, and the corresponding output voltage V of the accelerometer under different values is recorded₃(ii) a Controlling the reverse rotation of the centrifugal machine to enable the input acceleration to be a preset negative value with different values, and recording corresponding output voltages V of the accelerometer under different values₄(ii) a According to the output voltage V₃And said output voltage V₄Obtaining a scale factor value, a nonlinear parameter and a measuring range before the accelerometer test;

when the test tool is detached from the centrifuge and put into a reliability test environment and is fixed on the centrifuge again after the test is finished, controlling the main centrifuge to rotate so that the input acceleration is a preset positive value of different values, and recording corresponding output voltages V of the accelerometer under different values₅(ii) a Controlling the secondary centrifuge to reversely rotate so that the input acceleration is a preset negative value with different values, and recording corresponding output voltages V of the accelerometer under different values₆(ii) a According to the output voltage V₅And said output voltage V₆Obtaining a scale factor value, a nonlinear parameter and a measuring range after the accelerometer test;

and acquiring corresponding test difference values according to the scale factor values, the nonlinear parameters and the measuring range before and after the accelerometer reliability test, and evaluating the reliability of the accelerometer according to the test difference values.

9. An evaluation apparatus based on the evaluation method of claim 8, comprising:

test ofA front scale factor acquisition module for controlling the rotation of the main centrifuge to make the input acceleration be a predetermined positive value of different values and recording the corresponding output voltage V of the accelerometer under different values when the accelerometer is installed on the test tool and powered on to work₃(ii) a Controlling the secondary centrifuge to reversely rotate so that the input acceleration is a preset negative value with different values, and recording corresponding output voltages V of the accelerometer under different values₄(ii) a According to the output voltage V₃And said output voltage V₄Obtaining a scale factor value, a nonlinear parameter and a measuring range before the accelerometer test;

a post-test scale factor acquisition module for controlling the main centrifuge to rotate so that the input acceleration is a predetermined positive value of different values and recording the corresponding output voltage V of the accelerometer under different values when the test fixture is detached from the centrifuge and put into a reliability test environment and is fixed on the centrifuge again after the test is finished₅(ii) a Controlling the secondary centrifuge to reversely rotate so that the input acceleration is a preset negative value with different values, and recording corresponding output voltages V of the accelerometer under different values₆(ii) a According to the output voltage V₅And said output voltage V₆Obtaining a scale factor value, a nonlinear parameter and a measuring range after the accelerometer test;

and the scale factor test difference evaluation module is used for obtaining corresponding test differences according to scale factor values, nonlinear parameters and measuring ranges before and after the accelerometer reliability test, and evaluating the reliability of the accelerometer according to the test differences.

10. A storable medium having stored thereon a computer program, characterized in that the program is adapted to be executed by a processor for performing the steps of the method as claimed in claim 8.

Images