CN107102172B - The test method and device of accelerometer resolution ratio - Google Patents
The test method and device of accelerometer resolution ratio Download PDFInfo
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- CN107102172B CN107102172B CN201710296057.4A CN201710296057A CN107102172B CN 107102172 B CN107102172 B CN 107102172B CN 201710296057 A CN201710296057 A CN 201710296057A CN 107102172 B CN107102172 B CN 107102172B
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Abstract
The present invention relates to the test methods and device of a kind of accelerometer resolution ratio, accelerometer is horizontally arranged on the rotary table top of the slave centrifuge of double centrifuges, the centrifugal acceleration generated on the main centrifuge rotary table top rotation Shi Cong centrifuge of double centrifuges is important on accelerometer, and accelerometer exports corresponding data under the action of the component；Main centrifuge is chosen in the target susceptibility shaft angle angle value of the target centrifugal acceleration, accelerometer generated from centrifuge and the target susceptibility shaft angle degree incremental value of accelerometer according to the aimed acceleration incremental value of accelerometer, the different output datas of accelerometer are obtained, it is whether up to standard come the resolution ratio for judging accelerometer according to the ratio of the idea output of output difference and accelerometer under aimed acceleration incremental value.In the present solution, can carry out resolution test to accelerometer using double centrifuges reduces the hardware cost of test without other valuable test equipments such as gravitational field 1g tumbling test equipment.
Description
Technical field
The present invention relates to accelerometers to test technical field, more particularly to a kind of test method of accelerometer resolution ratio
And device.
Background technique
Accelerometer vibration detection, action recognition, state recording and in terms of be widely used.
In the development of accelerometer, production and in use, require to calibrate the performance of accelerometer.
Performance indexes of the accelerometer within ± 1g is tested using gravitational field 1g tumbling test, but is surveyed
Amount range is confined within ± 1g.Since acceleration of gravity can accurately know its size and Orientation, point of accelerometer
Resolution is tested using gravitational field 1g tumbling test.
However, being more than the accelerometer of 1g for range, the test calibration of resolution ratio is also needed using other equipment
It can complete, such as precision centrifuge.If the static performance index such as the resolution ratio of accelerometer to range greater than 1g are surveyed
Test-object is fixed, needs gravitational field 1g tumbling test equipment and the two or more equipment of precision centrifuge that can complete, the hardware of test
Higher cost.
Summary of the invention
Based on this, it is necessary to for hard needed for test calibration of traditional range greater than the resolution ratio of the accelerometer of 1g
The problem of part higher cost, provides the test method and device of a kind of accelerometer resolution ratio.
A kind of test method of accelerometer resolution ratio, comprising the following steps:
Accelerometer is horizontally arranged on the rotary table top of the slave centrifuge of double centrifuges, wherein be arranged from centrifuge
On the rotary table top of the main centrifuge of double centrifuges, main centrifuge and the rotary table top from centrifuge are horizontally disposed with；
The aimed acceleration incremental value that accelerometer is chosen according to the resolution ratio calibration value of accelerometer, accelerates according to target
It spends incremental value and chooses main centrifuge in the target centrifugal acceleration generated from centrifuge, the target susceptibility shaft angle of accelerometer
The target susceptibility shaft angle degree incremental value of angle value and accelerometer；Wherein, sensitive axes angle is the sensitive axes and reference of accelerometer
The included angle of straight line, the line of rotation center and the rotation center from centrifuge with reference to straight line perpendicular to main centrifuge；
Rotation makes the sensitive axes angle value of accelerometer reach target susceptibility shaft angle angle value, root from the rotary table top of centrifuge
Main centrifuge is operated according to target centrifugal acceleration, records the first output valve of accelerometer；
According to the rotation of target susceptibility shaft angle degree incremental value from the rotary table top of centrifuge, the second output of accelerometer is recorded
Value；
The output difference between the second output valve and the first output valve is calculated, and the input of aimed acceleration incremental value is added
Idea output under the conditions of speedometer determines acceleration if the ratio of output difference and idea output is greater than preset value
The resolution test of meter passes through.
According to the test method of above-mentioned accelerometer resolution ratio, main centrifuge is arranged in the slave centrifuge in double centrifuges
On rotary table top, accelerometer is arranged in from the rotary table top of centrifuge, and the sensitive axes of accelerometer have a sensitive axes angle,
The centrifugal acceleration generated on main centrifuge rotation Shi Cong centrifuge is important on accelerometer, and accelerometer is in the component
Under the action of export corresponding data, produced from centrifuge according to the aimed acceleration incremental value of accelerometer and main centrifuge
The target susceptibility axis angle step of the target susceptibility shaft angle angle value of raw target centrifugal acceleration, accelerometer, accelerometer
Physical geometry relationship between value changes sensitive axes angle, the difference of available accelerometer by rotating from centrifuge
Output data can be sentenced according to the ratio of the idea output of output difference and accelerometer under aimed acceleration incremental value
Whether the resolution ratio of disconnected accelerometer is up to standard.In the present solution, can be tested accelerometer using double centrifuges, nothing
Other valuable test equipments such as gravitational field 1g tumbling test equipment are needed, the hardware cost of test, and measurement range are reduced
It is not limited within ± 1g, the test to low g value or accelerometer with high g values resolution ratio may be implemented.
A kind of test device of accelerometer resolution ratio, including double centrifuges and fixture；
Double centrifuges include main centrifuge and from centrifuge, and the rotation of the main centrifuge of double centrifuges is arranged in from centrifuge
On table top, main centrifuge and the rotary table top from centrifuge are horizontally disposed with；Fixture is arranged in from the rotary table top of centrifuge,
For being horizontally mounted accelerometer；
The aimed acceleration incremental value that accelerometer is chosen according to the resolution ratio calibration value of accelerometer, accelerates according to target
It spends incremental value and chooses main centrifuge in the target centrifugal acceleration generated from centrifuge, the target susceptibility shaft angle of accelerometer
The target susceptibility shaft angle degree incremental value of angle value and accelerometer；Wherein, sensitive axes angle is the sensitive axes and reference of accelerometer
The included angle of straight line, the line of rotation center and the rotation center from centrifuge with reference to straight line perpendicular to main centrifuge；
Accelerometer is horizontally arranged at from the rotary table top of centrifuge, rotation makes to accelerate from the rotary table top of centrifuge
The sensitive axes angle value of degree meter reaches target susceptibility shaft angle angle value, operates main centrifuge, record according to target centrifugal acceleration
First output valve of accelerometer；
According to the rotation of target susceptibility shaft angle degree incremental value from the rotary table top of centrifuge, the second output of accelerometer is recorded
Value；
The output difference between the second output valve and the first output valve is calculated, and the input of aimed acceleration incremental value is added
Idea output under the conditions of speedometer determines acceleration if the ratio of output difference and idea output is greater than preset value
The resolution test of meter passes through.
According to the test device of above-mentioned accelerometer resolution ratio comprising double centrifuges and fixture, in double centrifuges from
Centrifuge is arranged on the rotary table top of main centrifuge, and accelerometer is mounted on from the rotary table top of centrifuge by fixture,
The sensitive axes of accelerometer have a sensitive axes angle, and the centrifugal acceleration generated on main centrifuge rotation Shi Cong centrifuge is adding
Important on speedometer, accelerometer exports corresponding data under the action of the component, is accelerated according to the target of accelerometer
Incremental value and main centrifuge are spent in the target centrifugal acceleration generated from centrifuge, the target susceptibility shaft angle degree of accelerometer
It is worth, the physical geometry relationship between the target susceptibility shaft angle degree incremental value of accelerometer, it is quick to change from centrifuge by rotating
Feel shaft angle degree, the different output datas of available accelerometer increase according to output difference and accelerometer in aimed acceleration
The ratio of idea output under magnitude is it may determine that whether the resolution ratio of accelerometer is up to standard.In the present solution, using double
Centrifuge can test accelerometer, without other valuable test equipments such as gravitational field 1g tumbling test equipment,
The hardware cost of test is reduced, and measurement range is not limited within ± 1g, may be implemented to accelerate low g value or high-g level
The test of degree score resolution.
Detailed description of the invention
Fig. 1 is the flow diagram of the test method of the accelerometer resolution ratio of one of embodiment；
Fig. 2 is the structural schematic diagram of the test device of the accelerometer resolution ratio of one of embodiment；
Fig. 3 is the structure principle chart of double centrifuges in the test device of the accelerometer resolution ratio of one of embodiment；
Fig. 4 is the sensitive axes angle schematic diagram of accelerometer on the slave centrifuge of one of embodiment.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention more comprehensible, with reference to the accompanying drawings and embodiments, to this
Invention is described in further detail.It should be appreciated that the specific embodiments described herein are only used to explain the present invention,
And the scope of protection of the present invention is not limited.
It is shown in Figure 1, it is the flow diagram of the test method of accelerometer resolution ratio of the invention.The present embodiment
The test method of accelerometer resolution ratio, comprising the following steps:
Step S101: accelerometer is horizontally arranged on the rotary table top of the slave centrifuge of double centrifuges；Wherein, from from
Scheming is arranged on the rotary table top of the main centrifuge of double centrifuges, and main centrifuge and the equal level of rotary table top from centrifuge are set
It sets；
Step S102: the aimed acceleration incremental value of accelerometer, root are chosen according to the resolution ratio calibration value of accelerometer
Main centrifuge is chosen in the target centrifugal acceleration generated from centrifuge, the mesh of accelerometer according to aimed acceleration incremental value
Mark the target susceptibility shaft angle degree incremental value of sensitive axes angle value and accelerometer；Wherein, sensitive axes angle is the quick of accelerometer
Feel axis and the included angle with reference to straight line, the rotation center with reference to straight line perpendicular to main centrifuge and the rotation center from centrifuge
Line；
In this step, meet the target centrifugal acceleration and target susceptibility axis chosen in double centrifuges and accelerometer
There is a centrifugal acceleration under conditions of angle value, on accelerometer, it is quick that the target susceptibility shaft angle angle value of accelerometer increases target
After feeling shaft angle degree incremental value, there are a centrifugal acceleration, the difference of latter centrifugal acceleration and previous centrifugal acceleration on accelerometer
Value is aimed acceleration incremental value；
Step S103: rotation makes the sensitive axes angle value of accelerometer reach target susceptibility axis from the rotary table top of centrifuge
Angle value operates main centrifuge according to target centrifugal acceleration, records the first output valve of accelerometer；
Step S104: according to the rotation of target susceptibility shaft angle degree incremental value from the rotary table top of centrifuge, accelerometer is recorded
The second output valve；
In this step, being rotated according to target susceptibility shaft angle degree incremental value from the rotary table top of centrifuge is in step S103
On the basis of carry out, i.e. rotation makes the sensitive axes angle value of accelerometer reach target susceptibility axis from the rotary table top of centrifuge
Angle value and target susceptibility shaft angle degree incremental value and value；
Step S105: the output difference between the second output valve and the first output valve is calculated, and aimed acceleration is increased
Idea output under the conditions of magnitude input acceleration meter, if the ratio of output difference and idea output is greater than preset value,
Determine that the resolution test of accelerometer passes through.
In the present embodiment, the slave centrifuge in double centrifuges is arranged on the rotary table top of main centrifuge, accelerometer
It is arranged in from the rotary table top of centrifuge, the sensitive axes of accelerometer have a sensitive axes angle, and main centrifuge rotates Shi Cong
The centrifugal acceleration generated on centrifuge is important on accelerometer, and accelerometer exports accordingly under the action of the component
Data, according to the aimed acceleration incremental value of accelerometer and main centrifuge in the target centrifugal acceleration generated from centrifuge
Value, the target susceptibility shaft angle angle value of accelerometer, accelerometer target susceptibility shaft angle degree incremental value between physical geometry close
System changes sensitive axes angle, the different output datas of available accelerometer, according to output difference by rotating from centrifuge
Value and idea output of the accelerometer under aimed acceleration incremental value ratio it may determine that accelerometer resolution ratio
It is whether up to standard.In the present solution, can be tested accelerometer using double centrifuges, without gravitational field 1g tumbling test
Other valuable test equipments such as equipment, reduce the hardware cost of test, and measurement range is not limited within ± 1g, can
To realize the test to low g value or accelerometer with high g values resolution ratio.
Optionally, the step of operating main centrifuge according to target centrifugal acceleration can be by adjusting the rotation of main centrifuge
The rotation speed of table with revolvable top is realized.When the rotary table top of main centrifuge is rotated with a fixed angular speed, generated from centrifuge
Certain centrifugal acceleration, the angular speed of the rotary table top of the size and main centrifuge of centrifugal acceleration and the rotation of main centrifuge
The distance dependent at center and rotation center from centrifuge meets following relationship between three: a=w2R, in formula, a is target
Centrifugal acceleration, w are the angular speed of the rotary table top of main centrifuge, the rotation center and the rotation from centrifuge that r is main centrifuge
Turn the distance at center.According to target centrifugal acceleration and the rotation center of main centrifuge and the rotation center from centrifuge away from
Target angular velocity value from the rotary table top for calculating main centrifuge, the rotary table top of main centrifuge are rotated with target angular velocity
When, it just can produce target centrifugal acceleration from centrifuge.
Optionally, idea output is calculated according to Δ U=K* Δ g, in formula, Δ U indicates idea output, and K indicates to accelerate
The constant multiplier of meter is spent, Δ g indicates aimed acceleration incremental value.
Aimed acceleration incremental value, target centrifugal acceleration, target susceptibility shaft angle angle value in one of the embodiments,
Meet following relationship with target susceptibility shaft angle degree incremental value:
Δ a=a [sin (θ+Δ θ)-sin θ]
In formula, Δ a indicates that aimed acceleration incremental value, a indicate that target centrifugal acceleration, θ indicate target susceptibility shaft angle
Angle value, Δ θ indicate target susceptibility shaft angle degree incremental value.
It in the present embodiment, can be with fast selecting according to above-mentioned formula after determining aimed acceleration incremental value
Target centrifugal acceleration, target susceptibility shaft angle angle value and target susceptibility shaft angle degree incremental value.
Optionally, should be in the acceleration range of main centrifuge according to the target centrifugal acceleration that formula is chosen, target
Sensitive axes angle value between 0 to 90 degree, target susceptibility shaft angle angle value and target susceptibility shaft angle degree incremental value and value also arrived 0
Between 90 degree.
Main centrifuge is chosen according to aimed acceleration incremental value in one of the embodiments, generating from centrifuge
The target susceptibility shaft angle degree incremental value of target centrifugal acceleration, the target susceptibility shaft angle angle value of accelerometer and accelerometer
Step the following steps are included:
Multiple groups target data is chosen according to aimed acceleration incremental value, every group of target data includes target centrifugal acceleration
Value, target susceptibility shaft angle angle value and target susceptibility shaft angle degree incremental value；
The step of calculating the output difference between the second output valve and the first output valve the following steps are included:
The output difference between the second output valve and the first output valve is being calculated under different groups of target datas, is being calculated all defeated
The average value of difference out；
The ratio for exporting difference and idea output is greater than the ratio that preset value is average value and aimed acceleration incremental value
Greater than preset value.
In the present embodiment, main centrifuge is being chosen in target centrifugal acceleration, the acceleration generated from centrifuge
When the target susceptibility shaft angle degree incremental value of the target susceptibility shaft angle angle value of meter and accelerometer, multiple groups target data can be chosen,
All include above-mentioned three kinds of numerical value in every group of target data, the output difference of accelerometer is calculated under different groups of target datas, and
Calculate average value, it is possible to reduce because of test error brought by hardware of test device itself, improve the accurate of measuring resolution
Property.
Optionally, when calculating the average value of all output differences, directly all output differences can be summed it up, then divided by
Target set of data number, obtains average value；It can also be weighted and averaged calculating, such as by the maximum value in all output differences and most
Small value is rejected, then seeks the average value of remaining output difference, the output difference for being clearly present measurement error can be so rejected, into one
Step improves the accuracy of measuring resolution.
Target centrifugal acceleration in one of the embodiments, in each group target data is identical.
In the present embodiment, the target centrifugal acceleration in each group target data is identical, when testing first time according to mesh
Mark centrifugal acceleration is adjusted main centrifuge, when carrying out resolution test under different groups of target datas later, is not necessarily to
Main centrifuge is adjusted again, simplifies testing process.
Each group target data is arranged according to the sequence of target susceptibility shaft angle angle value from small to large in one of the embodiments,
Afterwards, the sum of the target susceptibility shaft angle angle value in previous group target data and target susceptibility shaft angle degree incremental value are equal to later group target
Target susceptibility shaft angle angle value in data.
In the present embodiment, each group target data of selection is in certain rule, according to target susceptibility shaft angle angle value from small
After arranging to big sequence each group target data, the target susceptibility shaft angle angle value and target in previous group target data are quick
Feel the target susceptibility shaft angle angle value that the sum of shaft angle degree incremental value is equal in later group target data, carries out different groups of target datas
It when test, is tested twice for previous group target data, obtains the first output valve and the second output valve, due to for latter
First output valve of group target data is to be directed to the second output valve of previous group target data, therefore be directed to subsequent each group target
Data only need to be tested once, and testing process is enormously simplified.
During actual test, after the first output valve and the second output valve are obtained under previous group target data, continue
The rotary table top from centrifuge is rotated, the variable quantity of the sensitive axes angle of accelerometer is made to reach the mesh in current group target data
Sensitive axes angle step value is marked, the second output valve of the accelerometer under currently group target data is obtained, in currently group number of targets
The first output valve according to lower accelerometer is the second output valve of the accelerometer under previous group target data.
Main centrifuge is chosen according to aimed acceleration incremental value in one of the embodiments, generating from centrifuge
The target susceptibility shaft angle degree incremental value of target centrifugal acceleration, the target susceptibility shaft angle angle value of accelerometer and accelerometer
Step the following steps are included:
Sensitive axes angle step is determined according to from the Angle Position resolution ratio of centrifuge.
In the present embodiment, need to change sensitive axes angle in resolution test, knots modification is target susceptibility shaft angle
It spends incremental value and determines sensitive axes angle according to from the Angle Position resolution ratio of centrifuge from the Angle Position limited resolution of centrifuge
Increment can satisfy the condition of equipment test, and the sensitive axes angle thereby determined that is smaller, when testing same resolution ratio,
Lesser target susceptibility shaft angle degree incremental value is chosen, the target susceptibility shaft angle angle value of selection is also smaller, can be to avoid target susceptibility
Accelerometer brought by shaft angle angle value is excessive is from the uncertainty and unstability on centrifuge.
In one of the embodiments, the line of the mass centre of accelerometer and rotation center from centrifuge perpendicular to
From the rotary table top of centrifuge.
In the present embodiment, the line of the weight center of accelerometer and rotation center from centrifuge is perpendicular to from centrifugation
The rotary table top of machine, when such main centrifuge rotates to the centrifugal acceleration from centrifuge itself and accelerometer thereon from
Heart acceleration is identical, and the practical centrifugal acceleration and main centrifuge that can reduce on accelerometer are generating mesh from centrifuge
The error for marking the theoretical acceleration value of centrifugal acceleration brief acceleration meter, further increases the accuracy of resolution test.
Being rotated in one of the embodiments, from the rotary table top of centrifuge reaches the sensitive axes angle value of accelerometer
Before the step of target susceptibility shaft angle angle value the following steps are included:
By the sensitive axes angle value zero setting of accelerometer.
In the present embodiment, before testing begins, by the sensitive axes angle value zero setting of accelerometer, convenient in test
The sensitive axes angle value of accelerometer is directly accurately controlled according to target susceptibility shaft angle angle value.
Optionally, by rotating the sensitive axes angle value zero setting from the rotary table top of centrifuge to accelerometer.
It is in one of the embodiments, two or more from centrifuge, is respectively symmetrically mounted on main centrifuge from centrifuge
On rotary table top.
In the present embodiment, multiple from the rotary table top that centrifuge is symmetrically mounted on main centrifuge, it can be in main centrifugation
The entire double centrifuges of balance, utmostly avoid main centrifuge in the target generated from centrifuge when the rotary table top rotation of machine
The fluctuation of centrifugal acceleration further improves the accuracy of resolution test.
Optionally, in test, accelerometer is mounted on one from centrifuge, the weight bearing identical in quality with accelerometer
Object is fixed on the slave centrifuge of symmetric position, so can further be balanced when the rotary table top of main centrifuge rotates entire
Double centrifuges.
According to the test method of above-mentioned accelerometer resolution ratio, the present invention also provides a kind of tests of accelerometer resolution ratio
Device, just the embodiment of the test device of accelerometer resolution ratio of the invention is described in detail below.
It is shown in Figure 2, it is the structural schematic diagram of the test device of accelerometer resolution ratio of the invention.In the embodiment
Accelerometer resolution ratio test device, including double centrifuges 200 and fixture 300；
Double centrifuges 200 are arranged from centrifuge 220 in main centrifuge 210 including main centrifuge 210 and from centrifuge 220
Rotary table top on, main centrifuge 210 and rotary table top from centrifuge 220 are horizontally disposed；Fixture setting is from centrifuge
On 220 rotary table top, for being horizontally mounted accelerometer；
The aimed acceleration incremental value that accelerometer is chosen according to the resolution ratio calibration value of accelerometer, accelerates according to target
It is quick in the target centrifugal acceleration, the target of accelerometer generated from centrifuge 220 to spend incremental value selection main centrifuge 210
Feel the target susceptibility shaft angle degree incremental value of shaft angle angle value and accelerometer；Wherein, sensitive axes angle is the sensitive axes of accelerometer
With the included angle of reference straight line, with reference to straight line perpendicular to main centrifuge 210 rotation center with from the rotation of centrifuge 220
The line of the heart；
Accelerometer is horizontally arranged at from the rotary table top of centrifuge 220, the rotary table top from centrifuge 220 is rotated
So that the sensitive axes angle value of accelerometer is reached target susceptibility shaft angle angle value, main centrifuge is operated according to target centrifugal acceleration
210, record the first output valve of accelerometer；
According to the rotation of target susceptibility shaft angle degree incremental value from the rotary table top of centrifuge 220, the second of accelerometer is recorded
Output valve；
The output difference between the second output valve and the first output valve is calculated, and the input of aimed acceleration incremental value is added
Idea output under the conditions of speedometer determines acceleration if the ratio of output difference and idea output is greater than preset value
The resolution test of meter passes through.
According to the test device of above-mentioned accelerometer resolution ratio comprising double centrifuges 200 and fixture 300, double centrifuges
Slave centrifuge 220 in 200 is arranged on the rotary table top of main centrifuge 210, accelerometer by fixture 300 be mounted on from from
On the rotary table top of scheming, the sensitive axes of accelerometer have a sensitive axes angle, and main centrifuge 210 rotates Shi Cong centrifuge
The centrifugal acceleration generated on 220 is important on accelerometer, and accelerometer exports corresponding number under the action of the component
According to, according to the aimed acceleration incremental value of accelerometer and main centrifuge 210 in the target centrifugation generated from centrifuge 220 plus
Velocity amplitude, the target susceptibility shaft angle angle value of accelerometer, accelerometer target susceptibility shaft angle degree incremental value between physics it is several
What relationship changes sensitive axes angle, the different output datas of available accelerometer, root by rotating from centrifuge 220
According to the ratio of the idea output of output difference and accelerometer under aimed acceleration incremental value it may determine that accelerometer
Resolution ratio it is whether up to standard.In the present solution, can be tested accelerometer using double centrifuges, without gravitational field 1g
Other valuable test equipments such as tumbling test equipment, reduce the hardware cost of test, and measurement range be not limited to ±
Within 1g, the test to low g value or accelerometer with high g values resolution ratio may be implemented.
Aimed acceleration incremental value, target centrifugal acceleration, target susceptibility shaft angle angle value in one of the embodiments,
Meet following relationship with target susceptibility shaft angle degree incremental value:
Δ a=a [sin (θ+Δ θ)-sin θ]
In formula, Δ a indicates that aimed acceleration incremental value, a indicate that target centrifugal acceleration, θ indicate target susceptibility shaft angle
Angle value, Δ θ indicate target susceptibility shaft angle degree incremental value.
In one of the embodiments, when the test device using accelerometer resolution ratio is tested, according to target
Acceleration incremental value chooses multiple groups target data, and every group of target data includes target centrifugal acceleration, target susceptibility shaft angle degree
Value and target susceptibility shaft angle degree incremental value；It is defeated between the second output valve and the first output valve being calculated under different groups of target datas
Difference out calculates the average value of all output differences；If the ratio of the average value and idea output that export difference is greater than default
Value, then determine that the resolution test of accelerometer passes through.
Target centrifugal acceleration in one of the embodiments, in each group target data is identical.
Each group target data is arranged according to the sequence of target susceptibility shaft angle angle value from small to large in one of the embodiments,
Afterwards, the sum of the target susceptibility shaft angle angle value in previous group target data and target susceptibility shaft angle degree incremental value are equal to later group target
Target susceptibility shaft angle angle value in data.
In one of the embodiments, when the test device using accelerometer resolution ratio is tested, according to from from
The Angle Position resolution ratio of scheming 220 determines sensitive axes angle step.
The mass centre of accelerometer and the line of the rotation center from centrifuge 220 hang down in one of the embodiments,
Directly in the rotary table top from centrifuge 220.
Make the sensitive axes angle of accelerometer from the rotary table top of centrifuge 220 in rotation in one of the embodiments,
Before reaching target susceptibility shaft angle angle value, by the sensitive axes angle value zero setting of accelerometer.
Be in one of the embodiments, two or more from centrifuge 220, respectively from centrifuge 220 be symmetrically mounted on it is main from
On the rotary table top of scheming 210.
The test method one of the test device of accelerometer resolution ratio of the invention and accelerometer resolution ratio of the invention
One is corresponding, is applicable in the technical characteristic and its advantages of the embodiment elaboration of the test method of above-mentioned accelerometer resolution ratio
In the embodiment of the test device of accelerometer resolution ratio.
In a specific embodiment, as shown in figure 3, the mechanical stage body of double centrifuges by speed stabilizing platform 1 (main centrifuge),
Servo-actuated platform 2 (from centrifuge) composition.The rotary table top of speed stabilizing platform 1 is parallel to the ground, and speed stabilizing platform rotating shaft 3 is perpendicular to ground, surely
Servo-actuated platform 2 on fast 1 rotary table top of platform can for two or more than, servo-actuated platform 2 is symmetrically mounted on 1 rotary table top of speed stabilizing platform
On.
Accelerometer is mounted on the rotary table top of servo-actuated platform 2, and accelerometer sensitive axis is parallel to horizontal plane.Speed stabilizing platform 1
It is at the uniform velocity rotated with certain angular speed, the accelerometer on servo-actuated platform 2 generates certain centrifugal acceleration, centrifugal acceleration
Size by speed stabilizing platform 1 angular speed and working radius (between the rotation center of speed stabilizing platform 1 and the rotation center of servo-actuated platform 2 away from
From) determine, the direction of centrifugal acceleration is the direction that the rotation center of speed stabilizing platform 1 is directed toward the mass center of accelerometer.
Accelerometer is mounted on above servo-actuated platform 2 by fixture, radial centrifugal acceleration direction 5, accelerometer it is quick
It is as shown in Figure 4 to feel axis direction 6.Accelerometer sensitive axis and perpendicular to the angle 4 between the straight line of radial centrifugal acceleration be θ (θ
≠ 0), when speed stabilizing platform 1 rotates, enabling the size of the centrifugal acceleration at servo-actuated platform center is a, then centrifugal acceleration is in acceleration
Count the component in sensitive axis direction are as follows:
aθ=asin θ
The rotation of servo-actuated 2 rotary table top of platform can change angle 4, when angle 4 increases by an increment Delta θ, then accelerometer
The increment of centrifugal acceleration component in sensitive axis direction are as follows:
Δ a=a [sin (θ+Δ θ)-sin θ] (1)
The test of accelerometer resolution ratio is to input to verify in the acceleration input of non-zero g in given acceleration
Under conditions of increment, whether the output of accelerometer variation is greater than (e.g., the variation of reality output and using marking of defined variable quantity
50%) ratio of ideal variable quantity required by fixed constant multiplier is greater than.
It therefore, can be by designing suitable angle theta and increment for the test purpose and requirement of accelerometer resolution ratio
Δ θ, to generate the acceleration increment Delta a for meeting accelerometer resolution test requirement, thus the resolution ratio of testing acceleration meter
Whether certain to be measured level is reached.
Such as in order to judge whether accelerometer has 1 × 10-4The resolution ratio of g then needs to generate acceleration increment Delta a=1
×10-4G is applied on accelerometer, can be obtained by formula (1):
A [sin (θ+Δ θ)-sin θ]=1 × 10-4g (2)
Wherein, centrifugal acceleration a is determined by the revolving speed of speed stabilizing platform 1.Work as angle theta and increment Delta it can be seen from formula (1)
In the case that θ is constant, the size of centrifugal acceleration a will directly determine the generated magnitude for generating acceleration increment Delta a, because
This, selects lesser centrifugal acceleration a to be conducive to generate lesser acceleration increment Delta a.Comparison is based on gravitational field 1g rolling examination
The accelerometer resolution test method for testing equipment thus can not be by changing since acceleration of gravity is treated as steady state value
The method for becoming acceleration of gravity changes the size of acceleration increment Delta a, and can only be realized by changing angle theta and increment Delta θ
Adjustment to acceleration increment Delta a.
It is convenient to discuss, it is assumed that the size of centrifugal acceleration a is 1g, then can be calculated by formula (2), when requiring plus
Speed increment Δ a is 1 × 10-4When g, Δ θ=24 are taken ", then angle theta is about 31.2191 °；Take Δ θ=50 ", then angle theta is about
65.6313°。
According to above method, when needing to generate acceleration increment Delta a=0.5 × 10-4G equally takes Δ θ=24 ", then lead to
Crossing formula (2) and angle theta can be calculated is about 64.6825 °；If taking Δ θ=20 ", angle theta, which can be calculated, is about
58.6065°；Take Δ θ=15 ", then it is about 46.9905 ° that angle theta, which can be calculated,.
When needing to generate acceleration increment Delta a=1 × 10-5G equally takes Δ θ=24 ", then it can be calculated by formula (2)
It is about 85.0909 ° to angle theta；If taking Δ θ=10 ", it is about 78.1909 ° that angle theta, which can be calculated,；Take Δ θ=5 ", then
It is about 65.8412 ° that angle theta, which can be calculated,.
For different acceleration increment Delta a it can be seen from the above calculated result, can there are multipair angle theta and increment Delta θ
Combination can satisfy requirement, its main feature is that angle theta is bigger, then corresponding increment Delta θ when the timing of acceleration increment Delta a mono-
It is bigger, that is to say, that choose biggish angle theta, the requirement of the Angle Position resolution ratio to servo-actuated platform 2 can be reduced.
However, then choosing lesser increment when the Angle Position resolution ratio of servo-actuated platform 2 can satisfy the requirement of increment Delta θ
Δ θ can be such that angle theta reduces, brought uncertain and unstability when avoiding angle theta close to 90 °.
It can also be seen that and the accelerometer resolution test side based on gravitational field 1g tumbling test equipment by the above content
Method is compared, in the accelerometer resolution test based on double centrifuges, after θ and Δ θ is determined, by changing centrifugal acceleration
A can be directly changed the magnitude of Δ a.
Steps are as follows for specific method based on double measurement of centrifuge accelerometer resolution ratio:
1. being powered on, being returned to zero to servo-actuated platform 2, servo-actuated platform is made to be positioned at zero-bit；
2. accelerometer being fixed on the rotary table top of servo-actuated platform 2 by installs fixture, making the matter of accelerometer as far as possible
The line of amount center and servo-actuated 2 rotation center of platform perpendicular to servo-actuated platform 2 table top, while make the direction of accelerometer sensitive axis with
The direction of centrifugal acceleration when speed stabilizing platform 1 rotates is vertical；
3. electrical connection needed for completing accelerometer test；
4. determining the magnitude of Δ a according to the resolution ratio and its test request of accelerometer to be measured；
5. for the Δ a of any determination, can be obtained by the different values of tri- a, θ, Δ θ variables more according to formula (1)
Group can satisfy the numerical value group of Δ a；
6. according to fixed (a0, θ0, Δ θ0) value, the orientation angle of servo-actuated platform 2 is adjusted to θ0, set double centrifugations
The output acceleration of machine is a0, i.e., the centrifugal acceleration that speed stabilizing platform 1 generates at servo-actuated platform 2 is a0, record the defeated of accelerometer
Value U out0；
7. according to corresponding angle step Δ θ0Servo-actuated platform 2 is rotated, the output of testing acceleration meter is incremented by test 3 times altogether
More than, record each accelerometer output valve U1、U2... Un (n is the number for being incremented by test)；
When increasing test, the output acceleration of double centrifuges is a0It is constant, θn-1+Δθn-1=θn, and each group of (a0,
θn, Δ θn) all meet Δ a.
8. calculating servo-actuated platform 2 is positioned at different angle brief acceleration meter reality output increment Delta Up=Un-Un-1；It solves and accelerates
When degree meter corresponds to the input of Δ a in the ideal case, ideal output increment Δ U=K* Δ a, K are the scale of accelerometer
Factor；
When increasing test obtains multiple groups output increment, its average value can be taken；
9. judging Δ UpWhether/Δ U >=50% meets, if it is satisfied, then the resolution ratio of accelerometer reaches the resolution of Δ a
Rate requirement.
Based on the present invention, by comprehensively considering determining for centrifugal acceleration a, servo-actuated platform that speed stabilizing platform 1 generates on servo-actuated platform 2
Parallactic angle degree (angle i.e. between accelerometer sensitive axis and the straight line perpendicular to radial centrifugal acceleration) θ and corresponding angle
Tri- variables of increment Delta θ can be realized simultaneously the detection calibration to low g value or accelerometer with high g values resolution ratio, meanwhile, it is right
In the Δ a of any determination, all can get multiple groups can satisfy (a, θ, Δ θ) value of Δ a requirement, according to the resolution ratio of accelerometer
The condition of calibration value or test equipment chooses (a, θ, the Δ θ) value for being most suitable for operation, flexibility with higher, moreover, only
It needs to can be achieved with using double centrifuges and fixture, is not necessarily to gravitational field 1g tumbling test equipment, reduces the hardware cost of test.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (10)
1. a kind of test method of accelerometer resolution ratio, which comprises the following steps:
Accelerometer is horizontally arranged on the rotary table top of the slave centrifuge of double centrifuges, wherein described to be arranged from centrifuge
On the rotary table top of the main centrifuge of double centrifuges, the main centrifuge and the equal water of the rotary table top from centrifuge
Flat setting；
The aimed acceleration incremental value that the accelerometer is chosen according to the resolution ratio calibration value of the accelerometer, according to described
Aimed acceleration incremental value choose the main centrifuge the target centrifugal acceleration generated from centrifuge, it is described plus
The target susceptibility shaft angle angle value of speedometer and the target susceptibility shaft angle degree incremental value of the accelerometer；Wherein, sensitive axes angle
For the accelerometer sensitive axes and with reference to straight line included angle, it is described with reference to straight line perpendicular to the rotation of the main centrifuge
Turn the line at center Yu the rotation center from centrifuge；
Rotation is described to make the sensitive axes angle value of the accelerometer reach the target susceptibility axis from the rotary table top of centrifuge
Angle value operates the main centrifuge according to the target centrifugal acceleration, records the first output valve of the accelerometer；
According to the target susceptibility shaft angle degree incremental value rotation rotary table top from centrifuge, the accelerometer is recorded
Second output valve；
Calculate the output difference between second output valve and first output valve, and by the aimed acceleration increment
Value inputs the idea output under the conditions of the accelerometer, if the ratio of the output difference and the idea output is greater than
Preset value then determines that the resolution test of the accelerometer passes through.
2. the test method of accelerometer resolution ratio according to claim 1, which is characterized in that the aimed acceleration increases
Magnitude, the target centrifugal acceleration, the target susceptibility shaft angle angle value and the target susceptibility shaft angle degree incremental value meet
Following relationship:
Δ a=a [sin (θ+Δ θ)-sin θ]
In formula, Δ a indicates that the aimed acceleration incremental value, a indicate that the target centrifugal acceleration, θ indicate the target
Sensitive axes angle value, Δ θ indicate the target susceptibility shaft angle degree incremental value.
3. the test method of accelerometer resolution ratio according to claim 1, which is characterized in that described according to the target
Acceleration incremental value chooses the main centrifuge in the target centrifugal acceleration generated from centrifuge, the acceleration
The step of target susceptibility shaft angle degree incremental value of the target susceptibility shaft angle angle value of meter and the accelerometer the following steps are included:
Multiple groups target data is chosen according to the aimed acceleration incremental value, every group of target data includes the target CENTRIFUGAL ACCELERATING
Angle value, the target susceptibility shaft angle angle value and the target susceptibility shaft angle degree incremental value；
The step of output difference calculated between second output valve and first output valve the following steps are included:
The output difference between second output valve and first output valve is being calculated under different groups of target datas, calculates institute
There is the average value of output difference；
It is the average value and the aimed acceleration that the ratio of the output difference and the idea output, which is greater than preset value,
The ratio of incremental value is greater than preset value.
4. the test method of accelerometer resolution ratio according to claim 3, which is characterized in that target data described in each group
In the target centrifugal acceleration it is identical.
5. the test method of accelerometer resolution ratio according to claim 4, which is characterized in that target data described in each group
Target susceptibility shaft angle degree after the sequence arrangement of the target susceptibility shaft angle angle value from small to large, in previous group target data
The sum of value and target susceptibility shaft angle degree incremental value are equal to the target susceptibility shaft angle angle value in later group target data.
6. the test method of accelerometer resolution ratio according to claim 1, which is characterized in that described according to the target
Acceleration incremental value chooses the main centrifuge in the target centrifugal acceleration generated from centrifuge, the acceleration
The step of target susceptibility shaft angle degree incremental value of the target susceptibility shaft angle angle value of meter and the accelerometer the following steps are included:
Sensitive axes angle step is determined from the Angle Position resolution ratio of centrifuge according to described.
7. the test method of accelerometer resolution ratio as claimed in any of claims 1 to 6, which is characterized in that institute
The mass centre of accelerometer and the line of the rotation center from centrifuge are stated perpendicular to the turntable from centrifuge
Face.
8. the test method of accelerometer resolution ratio as claimed in any of claims 1 to 6, which is characterized in that institute
State makes the sensitive axes angle value of the accelerometer reach the target susceptibility shaft angle described in rotation from the rotary table top of centrifuge
Before the step of angle value the following steps are included:
By the sensitive axes angle value zero setting of the accelerometer.
9. the test method of accelerometer resolution ratio as claimed in any of claims 1 to 6, which is characterized in that institute
Stating from centrifuge is two or more, each described from the rotary table top that centrifuge is symmetrically mounted on the main centrifuge.
10. a kind of test device of accelerometer resolution ratio, which is characterized in that including double centrifuges and fixture；
Double centrifuges include main centrifuge and from centrifuge, the main centrifugation that double centrifuges are arranged in from centrifuge
On the rotary table top of machine, the main centrifuge and the rotary table top from centrifuge are horizontally disposed；The fixture setting exists
On the rotary table top from centrifuge, for being horizontally mounted accelerometer；
The aimed acceleration incremental value that the accelerometer is chosen according to the resolution ratio calibration value of the accelerometer, according to described
Aimed acceleration incremental value choose the main centrifuge the target centrifugal acceleration generated from centrifuge, it is described plus
The target susceptibility shaft angle angle value of speedometer and the target susceptibility shaft angle degree incremental value of the accelerometer；Wherein, sensitive axes angle
For the accelerometer sensitive axes and with reference to straight line included angle, it is described with reference to straight line perpendicular to the rotation of the main centrifuge
Turn the line at center Yu the rotation center from centrifuge；
Accelerometer is horizontally arranged at from the rotary table top of centrifuge, rotation is described make from the rotary table top of centrifuge it is described
The sensitive axes angle value of accelerometer reaches the target susceptibility shaft angle angle value, operates institute according to the target centrifugal acceleration
Main centrifuge is stated, the first output valve of the accelerometer is recorded；
According to the target susceptibility shaft angle degree incremental value rotation rotary table top from centrifuge, the accelerometer is recorded
Second output valve；
Calculate the output difference between second output valve and first output valve, and by the aimed acceleration increment
Value inputs the idea output under the conditions of the accelerometer, if the ratio of the output difference and the idea output is greater than
Preset value then determines that the resolution test of the accelerometer passes through.
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| CN109116051B (en) * | 2018-10-31 | 2020-12-15 | 中国船舶重工集团公司第七0七研究所 | High-precision accelerometer resolution test method |
| CN109813343B (en) * | 2019-03-21 | 2021-06-08 | 哈尔滨工业大学 | Method for measuring initial alignment error of centrifugal machine |
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