CN107102172A - The method of testing and device of accelerometer resolution ratio - Google Patents
The method of testing and device of accelerometer resolution ratio Download PDFInfo
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- CN107102172A CN107102172A CN201710296057.4A CN201710296057A CN107102172A CN 107102172 A CN107102172 A CN 107102172A CN 201710296057 A CN201710296057 A CN 201710296057A CN 107102172 A CN107102172 A CN 107102172A
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Abstract
The present invention relates to a kind of method of testing of accelerometer resolution ratio and device, on the rotary table top from centrifuge that accelerometer is horizontally arranged to double centrifuges, double centrifuges main centrifuge rotary table top rotation when the centrifugal acceleration produced from centrifuge on accelerometer it is important, accelerometer exports corresponding data in the presence of the component；Target susceptibility shaft angle degree increment size of the main centrifuge in target centrifugal acceleration, the target susceptibility shaft angle angle value of accelerometer and the accelerometer produced from centrifuge is chosen according to the aimed acceleration increment size 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 increment size.In this programme, can just resolution test be carried out to accelerometer using double centrifuges, without other valuable test equipments such as gravitational field 1g tumbling test equipment, reduce the hardware cost of test.
Description
Technical field
Technical field, more particularly to a kind of method of testing of accelerometer resolution ratio are tested the present invention relates to accelerometer
And device.
Background technology
Accelerometer is widely used in terms of vibration detection, action recognition, state recording and safe automobile air bag.
Development in accelerometer, production and in use, it is required for calibrating the performance of accelerometer.
Property indices of the accelerometer within ± 1g, are tested using gravitational field 1g tumbling tests, but are surveyed
Amount scope is confined within ± 1g.Because acceleration of gravity can accurately know its size and Orientation, therefore point of accelerometer
Resolution is tested using gravitational field 1g tumbling tests.
However, exceeding 1g accelerometer for range, the test calibration of its resolution ratio is also needed to using miscellaneous equipment
It can complete, such as precision centrifuge.If being more than the static performance index such as the 1g resolution ratio of accelerometer to range to survey
Test-object is fixed, it is necessary to gravitational field 1g tumbling tests equipment and the two or more equipment of precision centrifuge can be completed, the hardware of test
Cost is higher.
The content of the invention
Based on this, it is necessary to hard needed for the test calibration of the resolution ratio of the accelerometer for traditional range more than 1g
There is provided a kind of method of testing of accelerometer resolution ratio and device for the problem of part cost is higher.
A kind of method of testing of accelerometer resolution ratio, comprises the following steps：
On the rotary table top from centrifuge that accelerometer is horizontally arranged to double centrifuges, wherein, set 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 increment size of accelerometer is chosen according to the resolution ratio calibration value of accelerometer, is accelerated according to target
Spend increment size and choose main centrifuge in the target centrifugal acceleration produced from centrifuge, the target susceptibility shaft angle of accelerometer
The target susceptibility shaft angle degree increment size of angle value and accelerometer；Wherein, sensitive axes and reference of the sensitive axes angle for accelerometer
The angle angle of straight line, with reference to the line of pivot of the straight line perpendicular to main centrifuge and the pivot from centrifuge；
Rotating from the rotary table top of centrifuge makes the sensitive axes angle value of accelerometer reach target susceptibility shaft angle angle value, root
Main centrifuge is operated according to target centrifugal acceleration, the first output valve of accelerometer is recorded；
Rotary table top from centrifuge, the second output of record accelerometer are rotated according to target susceptibility shaft angle degree increment size
Value；
The output difference between the second output valve and the first output valve is calculated, and the input of aimed acceleration increment size is added
Idea output under the conditions of speedometer, if the ratio of output difference and idea output is more than preset value, judges acceleration
The resolution test of meter passes through.
According to the method for testing of above-mentioned accelerometer resolution ratio, main centrifuge is arranged on from centrifuge in double centrifuges
On rotary table top, accelerometer is arranged on from the rotary table top of centrifuge, and the sensitive axes of accelerometer have a sensitive axes angle,
Main centrifuge rotate when the centrifugal acceleration produced from centrifuge on accelerometer it is important, accelerometer is in the component
In the presence of export corresponding data, produced according to the aimed acceleration increment size of accelerometer and main centrifuge from centrifuge
Raw target centrifugal acceleration, the target susceptibility shaft angle angle value of accelerometer, the target susceptibility axle angle step of accelerometer
Physical geometry relation between value, changes sensitive axes angle by rotating from centrifuge, can obtain the difference of accelerometer
Output data, can just sentence according to the ratio of the idea output of output difference and accelerometer under aimed acceleration increment size
Whether the resolution ratio of disconnected accelerometer is up to standard.In this programme, accelerometer can just be tested 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 is reduced
It is not limited within ± 1g, it is possible to achieve the test to low g value or accelerometer with high g values resolution ratio.
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 on from centrifuge
On table top, main centrifuge and the rotary table top from centrifuge are horizontally disposed with；Fixture is arranged on from the rotary table top of centrifuge,
For being horizontally mounted accelerometer；
The aimed acceleration increment size of accelerometer is chosen according to the resolution ratio calibration value of accelerometer, is accelerated according to target
Spend increment size and choose main centrifuge in the target centrifugal acceleration produced from centrifuge, the target susceptibility shaft angle of accelerometer
The target susceptibility shaft angle degree increment size of angle value and accelerometer；Wherein, sensitive axes and reference of the sensitive axes angle for accelerometer
The angle angle of straight line, with reference to the line of pivot of the straight line perpendicular to main centrifuge and the pivot from centrifuge；
Accelerometer is horizontally arranged at from the rotary table top of centrifuge, rotating from the rotary table top of centrifuge makes acceleration
The sensitive axes angle value of degree meter reaches target susceptibility shaft angle angle value, and main centrifuge, record are operated according to target centrifugal acceleration
First output valve of accelerometer；
Rotary table top from centrifuge, the second output of record accelerometer are rotated according to target susceptibility shaft angle degree increment size
Value；
The output difference between the second output valve and the first output valve is calculated, and the input of aimed acceleration increment size is added
Idea output under the conditions of speedometer, if the ratio of output difference and idea output is more than preset value, judges acceleration
The resolution test of meter passes through.
According to the test device of above-mentioned accelerometer resolution ratio, it include in double centrifuges and fixture, double centrifuges from
Centrifuge is arranged on the rotary table top of main centrifuge, and accelerometer is arranged on from the rotary table top of centrifuge by fixture,
The sensitive axes of accelerometer have a sensitive axes angle, and main centrifuge is adding when rotating in the centrifugal acceleration produced from centrifuge
Important on speedometer, accelerometer exports corresponding data in the presence of the component, is accelerated according to the target of accelerometer
Spend the target susceptibility shaft angle degree of increment size and main centrifuge in the target centrifugal acceleration, accelerometer produced from centrifuge
Physical geometry relation between value, the target susceptibility shaft angle degree increment size of accelerometer, is changed quick by rotating from centrifuge
Feel shaft angle degree, the different output datas of accelerometer can be obtained, increased according to output difference and accelerometer in aimed acceleration
The ratio of idea output under value is it may determine that whether the resolution ratio of accelerometer is up to standard.In this programme, using double
Centrifuge can be just tested 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, it is possible to achieve low g value or high-g level are accelerated
The test of degree score resolution.
Brief description of the drawings
Fig. 1 is the schematic flow sheet of the method for testing of the accelerometer resolution ratio of one of embodiment；
Fig. 2 is the structural representation of the test device of the accelerometer resolution ratio of one of embodiment；
The structure principle chart of double centrifuges in test devices of the Fig. 3 for the accelerometer resolution ratio of one of embodiment；
Fig. 4 is the sensitive axes angle schematic diagram of accelerometer from centrifuge of one of embodiment.
Embodiment
For the objects, technical solutions and advantages of the present invention are more clearly understood, below in conjunction with drawings and Examples, to this
Invention is described in further detail.It should be appreciated that embodiment described herein is only to explain the present invention,
Do not limit protection scope of the present invention.
It is shown in Figure 1, it is the schematic flow sheet of the method for testing of the accelerometer resolution ratio of the present invention.The present embodiment
The method of testing of accelerometer resolution ratio, comprises the following steps：
Step S101：On the rotary table top from centrifuge that accelerometer is horizontally arranged to 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
Put；
Step S102：The aimed acceleration increment size of accelerometer, root are chosen according to the resolution ratio calibration value of accelerometer
Main centrifuge is chosen in the target centrifugal acceleration produced from centrifuge, the mesh of accelerometer according to aimed acceleration increment size
Mark the target susceptibility shaft angle degree increment size of sensitive axes angle value and accelerometer；Wherein, sensitive axes angle is the quick of accelerometer
Axle and the angle angle with reference to straight line are felt, with reference to pivot of the straight line perpendicular to main centrifuge and the pivot from centrifuge
Line；
In this step, the target centrifugal acceleration and target susceptibility axle chosen are met in double centrifuges and accelerometer
There is a centrifugal acceleration under conditions of angle value, on accelerometer, the target susceptibility shaft angle angle value increase target of accelerometer is quick
Feel after shaft angle degree increment size, there is a centrifugal acceleration, the difference of latter centrifugal acceleration and previous centrifugal acceleration on accelerometer
It is worth for aimed acceleration increment size；
Step S103：Rotating from the rotary table top of centrifuge makes the sensitive axes angle value of accelerometer reach target susceptibility axle
Angle value, main centrifuge is operated according to target centrifugal acceleration, records the first output valve of accelerometer；
Step S104：Rotary table top from centrifuge is rotated according to target susceptibility shaft angle degree increment size, accelerometer is recorded
The second output valve；
In this step, it is in step S103 to be rotated according to target susceptibility shaft angle degree increment size from the rotary table top of centrifuge
On the basis of carry out, that is, to rotate from the rotary table top of centrifuge make the sensitive axes angle value of accelerometer reach target susceptibility axle
Angle value and target susceptibility shaft angle degree increment size 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 value input acceleration meter, if the ratio of output difference and idea output is more than preset value,
Judge that the resolution test of accelerometer passes through.
In the present embodiment, being arranged on from centrifuge on the rotary table top of main centrifuge in double centrifuges, accelerometer
Be arranged on from the rotary table top of centrifuge, the sensitive axes of accelerometer have a sensitive axes angle, when main centrifuge rotates from
The centrifugal acceleration produced on centrifuge is important on accelerometer, and accelerometer is exported accordingly in the presence of the component
Data, according to the aimed acceleration increment size of accelerometer and main centrifuge in the target centrifugal acceleration produced from centrifuge
Physical geometry between value, the target susceptibility shaft angle degree increment size of the target susceptibility shaft angle angle value of accelerometer, accelerometer is closed
System, changes sensitive axes angle by rotating from centrifuge, the different output datas of accelerometer can be obtained, according to output difference
The ratio of value and idea output of the accelerometer under aimed acceleration increment size is it may determine that the resolution ratio of accelerometer
It is whether up to standard.In this programme, accelerometer can just be tested using double centrifuges, without gravitational field 1g tumbling tests
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 rotary speed of table with revolvable top is realized.When the rotary table top of main centrifuge is rotated with a fixed angular speed, produced from centrifuge
Certain centrifugal acceleration, the rotation of the angular speed and main centrifuge of the size of centrifugal acceleration and the rotary table top of main centrifuge
Following relationship is met between center and the distance dependent of the pivot from centrifuge, three：A=w2In r, formula, a is target
Centrifugal acceleration, w is the angular speed of the rotary table top of main centrifuge, rotations of the r for the pivot of main centrifuge and from centrifuge
Turn the distance at center.According to target centrifugal acceleration and the pivot of main centrifuge and the pivot from centrifuge away from
From the target angular velocity value for the rotary table top for calculating main centrifuge, the rotary table top of main centrifuge is rotated with target angular velocity
When, target centrifugal acceleration can be being produced from centrifuge.
Optionally, calculated according to Δ U=K* Δs g in idea output, formula, Δ U represents idea output, K represents to accelerate
The constant multiplier of meter is spent, Δ g represents aimed acceleration increment size.
In one of the embodiments, aimed acceleration increment size, target centrifugal acceleration, target susceptibility shaft angle angle value
Following relationship is met with target susceptibility shaft angle degree increment size：
Δ a=a [sin (θ+Δ θ)-sin θ]
In formula, Δ a represents aimed acceleration increment size, and a represents target centrifugal acceleration, and θ represents target susceptibility shaft angle
Angle value, Δ θ represents target susceptibility shaft angle degree increment size.
In the present embodiment, can be with fast selecting according to above-mentioned formula it is determined that after aimed acceleration increment size
Target centrifugal acceleration, target susceptibility shaft angle angle value and target susceptibility shaft angle degree increment size.
Optionally, the target centrifugal acceleration chosen according to formula should be in the acceleration range of main centrifuge, target
Sensitive axes angle value between 0 to 90 spend, target susceptibility shaft angle angle value and target susceptibility shaft angle degree increment size and value also arrived 0
Between 90 degree.
In one of the embodiments, main centrifuge is chosen according to aimed acceleration increment size producing from centrifuge
The target susceptibility shaft angle degree increment size of target centrifugal acceleration, the target susceptibility shaft angle angle value of accelerometer and accelerometer
Step comprises the following steps：
Multigroup target data is chosen according to aimed acceleration increment size, every group of target data includes target centrifugal acceleration
Value, target susceptibility shaft angle angle value and target susceptibility shaft angle degree increment size；
The step of calculating the output difference between the second output valve and the first output valve comprises the following steps：
The output difference between the second output valve and the first output valve is calculated under different groups of target datas, is calculated all defeated
Go out the average value of difference；
The ratio for exporting difference and idea output is more than the ratio that preset value is average value and aimed acceleration increment size
More than preset value.
In the present embodiment, main centrifuge is being chosen in target centrifugal acceleration, the acceleration produced from centrifuge
During the target susceptibility shaft angle degree increment size of the target susceptibility shaft angle angle value of meter and accelerometer, multigroup 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 the test error that the hardware of test device is brought in itself, improve the accurate of measuring resolution
Property.
Optionally, calculate it is all output differences average value when, can directly by it is all output differences add with, then divided by
Target set of data number, obtains average value；Average computation can also be weighted, such as by the maximum in all output differences and most
Small value is rejected, then seeks the average value of remaining output difference, can so be rejected the output difference for being clearly present measurement error, be entered one
Step improves the accuracy of measuring resolution.
In one of the embodiments, the target centrifugal acceleration 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 to main centrifuge, when carrying out resolution test under different groups of target datas afterwards, without
Main centrifuge is adjusted again, testing process is simplified.
In one of the embodiments, each group target data is arranged according to the order of target susceptibility shaft angle angle value from small to large
Afterwards, in previous group target data target susceptibility shaft angle angle value and target susceptibility shaft angle degree increment size sum is 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 being arranged to big order 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 shaft angle degree increment size sum is equal in later group target data, carry out different groups of target datas
During test, tested twice for previous group target data, the first output valve and the second output valve are obtained, due to for latter
First output valve of group target data is the second output valve for previous group target data, therefore for follow-up each group target
Data only need to be tested once, enormously simplify testing process.
During actual test, obtain after the first output valve and the second output valve, continue under previous group target data
The rotary table top from centrifuge is rotated, the variable quantity of the sensitive axes angle of accelerometer is reached the current mesh organized in 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
According to second output valve of the first output valve of lower accelerometer for the accelerometer under previous group target data.
In one of the embodiments, main centrifuge is chosen according to aimed acceleration increment size producing from centrifuge
The target susceptibility shaft angle degree increment size of target centrifugal acceleration, the target susceptibility shaft angle angle value of accelerometer and accelerometer
Step comprises the following steps：
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
Increment size is spent, from the Angle Position limited resolution of centrifuge, sensitive axes angle is determined according to from the Angle Position resolution ratio of centrifuge
Increment, can meet the condition of equipment test, and the sensitive axes angle thereby determined that is smaller, when testing same resolution ratio,
Less target susceptibility shaft angle degree increment size is chosen, the target susceptibility shaft angle angle value of selection is also smaller, can avoid target susceptibility
Excessive the brought accelerometer of shaft angle angle value is from the uncertainty and unstability on centrifuge.
In one of the embodiments, the line of the mass centre of accelerometer and pivot from centrifuge perpendicular to
From the rotary table top of centrifuge.
In the present embodiment, the line of the weight center of accelerometer and pivot from centrifuge is perpendicular to from centrifugation
The rotary table top of machine, during the rotation of such main centrifuge to from the centrifugal acceleration of centrifuge in itself and accelerometer thereon from
Heart acceleration is identical, and the actual centrifugal acceleration that can reduce on accelerometer is producing mesh with main centrifuge from centrifuge
The error of the theoretical acceleration value of centrifugal acceleration brief acceleration meter is marked, the degree of accuracy of resolution test is further improved.
In one of the embodiments, rotation reaches the sensitive axes angle value of accelerometer from the rotary table top of centrifuge
Comprise the following steps before the step of target susceptibility shaft angle angle value：
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, it is easy in test
The sensitive axes angle value of accelerometer is directly accurately controlled according to target susceptibility shaft angle angle value.
Optionally, by rotating from the sensitive axes angle value zero setting of the rotary table top of centrifuge to accelerometer.
In one of the embodiments, it is two or more from centrifuge, is respectively symmetrically mounted on main centrifuge from centrifuge
On rotary table top.
In the present embodiment, it is multiple to be symmetrically mounted on from centrifuge on the rotary table top of main centrifuge, can be in main centrifugation
The whole double centrifuges of balance, at utmost avoid main centrifuge in the target produced from centrifuge during the rotary table top rotation of machine
The fluctuation of centrifugal acceleration, further improves the degree of accuracy of resolution test.
Optionally, in test, accelerometer is arranged on one from centrifuge, the heavy burden identical in quality with accelerometer
Thing be fixed on symmetric position from centrifuge, so can further balance be whole in the rotary table top rotation of main centrifuge
Double centrifuges.
According to the method for testing of above-mentioned accelerometer resolution ratio, the present invention also provides a kind of test of accelerometer resolution ratio
Device, just the embodiment of the test device of the accelerometer resolution ratio of the present invention is described in detail below.
It is shown in Figure 2, it is the structural representation of the test device of the accelerometer resolution ratio of the present invention.In the embodiment
Accelerometer resolution ratio test device, including double centrifuges 200 and fixture 300；
Double centrifuges 200 include main centrifuge 210 and from centrifuge 220, and main centrifuge 210 is arranged on from centrifuge 220
Rotary table top on, main centrifuge 210 and rotary table top from centrifuge 220 are horizontally disposed with；Fixture is arranged on from centrifuge
On 220 rotary table top, for being horizontally mounted accelerometer；
The aimed acceleration increment size of accelerometer is chosen according to the resolution ratio calibration value of accelerometer, is accelerated according to target
Spend increment size selection main centrifuge 210 quick in the target centrifugal acceleration, the target of accelerometer produced from centrifuge 220
Feel the target susceptibility shaft angle degree increment size of shaft angle angle value and accelerometer；Wherein, sensitive axes angle is the sensitive axes of accelerometer
Angle angle with referring to straight line, with reference to straight line perpendicular to the pivot of main centrifuge 210 and 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
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；
Rotary table top from centrifuge 220, the second of record accelerometer are rotated according to target susceptibility shaft angle degree increment size
Output valve；
The output difference between the second output valve and the first output valve is calculated, and the input of aimed acceleration increment size is added
Idea output under the conditions of speedometer, if the ratio of output difference and idea output is more than preset value, judges acceleration
The resolution test of meter passes through.
According to the test device of above-mentioned accelerometer resolution ratio, it includes double centrifuges 200 and fixture 300, double centrifuges
Being arranged on from centrifuge 220 on the rotary table top of main centrifuge 210 in 200, accelerometer by fixture 300 be arranged on from from
On the rotary table top of scheming, the sensitive axes of accelerometer have a sensitive axes angle, from centrifuge when main centrifuge 210 rotates
The centrifugal acceleration produced on 220 is important on accelerometer, and accelerometer exports corresponding number in the presence of the component
According to, according to the aimed acceleration increment size of accelerometer and main centrifuge 210 in the target centrifugation produced from centrifuge 220 plus
Physics between velocity amplitude, the target susceptibility shaft angle angle value of accelerometer, the target susceptibility shaft angle degree increment size of accelerometer is several
What relation, changes sensitive axes angle by rotating from centrifuge 220, can obtain the different output datas of accelerometer, root
According to the ratio of the idea output of output difference and accelerometer under aimed acceleration increment size it may determine that accelerometer
Resolution ratio it is whether up to standard.In this programme, accelerometer can just be tested 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, it is possible to achieve the test to low g value or accelerometer with high g values resolution ratio.
In one of the embodiments, aimed acceleration increment size, target centrifugal acceleration, target susceptibility shaft angle angle value
Following relationship is met with target susceptibility shaft angle degree increment size：
Δ a=a [sin (θ+Δ θ)-sin θ]
In formula, Δ a represents aimed acceleration increment size, and a represents target centrifugal acceleration, and θ represents target susceptibility shaft angle
Angle value, Δ θ represents target susceptibility shaft angle degree increment size.
In one of the embodiments, when the test device using accelerometer resolution ratio is tested, according to target
Acceleration increment size chooses multigroup target data, and every group of target data includes target centrifugal acceleration, target susceptibility shaft angle degree
Value and target susceptibility shaft angle degree increment size；Calculate defeated between the second output valve and the first output valve under different groups of target datas
Go out difference, calculate the average value of all output differences；If exporting the average value of difference and the ratio of idea output more than default
Value, then judge that the resolution test of accelerometer passes through.
In one of the embodiments, the target centrifugal acceleration in each group target data is identical.
In one of the embodiments, each group target data is arranged according to the order of target susceptibility shaft angle angle value from small to large
Afterwards, in previous group target data target susceptibility shaft angle angle value and target susceptibility shaft angle degree increment size sum is 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.
In one of the embodiments, the mass centre of accelerometer and the line of the pivot from centrifuge 220 hang down
Directly in the rotary table top from centrifuge 220.
In one of the embodiments, the sensitive axes angle of accelerometer is made from the rotary table top of centrifuge 220 in rotation
Before reaching target susceptibility shaft angle angle value, by the sensitive axes angle value zero setting of accelerometer.
In one of the embodiments, be 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 method of testing one of the test device of the accelerometer resolution ratio of the present invention and the accelerometer resolution ratio of the present invention
One correspondence, the technical characteristic illustrated in the embodiment of the method for testing of above-mentioned accelerometer resolution ratio and its advantage are applicable
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 gyroaxis 3 is perpendicular to ground, surely
Servo-actuated platform 2 on the fast rotary table top of platform 1 can for two or more than, servo-actuated platform 2 is symmetrically mounted on the rotary table top of speed stabilizing platform 1
On.
Accelerometer is arranged on the rotary table top of servo-actuated platform 2, and accelerometer sensitive axle is parallel to horizontal plane.Speed stabilizing platform 1
At the uniform velocity rotated with certain angular speed, the accelerometer on servo-actuated platform 2 produces certain centrifugal acceleration, centrifugal acceleration
Size by speed stabilizing platform 1 angular speed and the radius of clean-up (between the pivot of speed stabilizing platform 1 and the pivot of servo-actuated platform 2 away from
From) determine, the direction of the barycenter of accelerometer is pointed in the direction of centrifugal acceleration for the pivot of speed stabilizing platform 1.
Accelerometer is arranged on above servo-actuated platform 2 by fixture, the centrifugal acceleration direction 5 of radial direction, accelerometer it is quick
Feel direction of principal axis 6 as shown in Figure 4.Accelerometer sensitive axle and angle 4 between the straight line of radial direction centrifugal acceleration are θ (θ
≠ 0), when speed stabilizing platform 1 rotates, the size of the centrifugal acceleration of the servo-actuated platform center of order is a, then centrifugal acceleration is in acceleration
Component on the sensitive direction of principal axis of meter is：
aθ=asin θ
The rotation of the servo-actuated rotary table top of platform 2 can change angle 4, when angle 4 increases by an increment Delta θ, then accelerometer
The increment of centrifugal acceleration component on sensitive direction of principal axis is：
Δ a=a [sin (θ+Δ θ)-sin θ] (1)
The test of accelerometer resolution ratio, be in order to verify non-zero g acceleration input when, given acceleration input
Under conditions of increment, the exporting change of accelerometer whether more than defined variable quantity, (e.g., with using mark by the change of reality output
50%) ratio of preferable variable quantity required by fixed constant multiplier be more than.
Therefore, the test purpose for accelerometer resolution ratio and requirement, can be by designing suitable angle theta and increment
Δ θ, to produce the acceleration increment Delta a for meeting accelerometer resolution test requirement, so that the resolution ratio of testing acceleration meter
Whether certain to be measured level is reached.
Such as in order to judge accelerometer whether have 1 × 10-4G resolution ratio, then need to produce 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 rotating 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, centrifugal acceleration a size will directly determine the produced magnitude for producing acceleration increment Delta a, because
This, selects less centrifugal acceleration a to be conducive to producing less acceleration increment Delta a.Contrast is rolled based on gravitational field 1g to be tried
The accelerometer resolution test method of equipment is tested, because acceleration of gravity is treated as steady state value, thus can not be by changing
The method for becoming acceleration of gravity changes acceleration increment Delta a size, 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 centrifugal acceleration a size is 1g, then can be calculated and obtained by formula (2), when requiring plus
Speed increment Δ a is 1 × 10-4During g, Δ θ=24 are taken ", then angle theta is about 31.2191 °；Take Δ θ=50 ", then angle theta is about
65.6313°。
Method according to more than, when needing to produce acceleration increment Delta a=0.5 × 10-4G, equally takes Δ θ=24 ", then lead to
Cross formula (2) and can calculate that to obtain angle theta be about 64.6825 °；If taking Δ θ=20 ", it can calculate and obtain angle theta and be about
58.6065°；Take Δ θ=15 ", then it is about 46.9905 ° that can calculate and obtain angle theta.
When needing to produce acceleration increment Delta a=1 × 10-5G, equally takes Δ θ=24 ", then it can be calculated by formula (2)
It it is about 85.0909 ° to angle theta；If taking Δ θ=10 ", it is about 78.1909 ° that can calculate and obtain angle theta；Take Δ θ=5 ", then
It is about 65.8412 ° that can calculate and obtain angle theta.
For different acceleration increment Delta a it can be seen from above result of calculation, can there are multipair angle theta and increment Delta θ
Combination can meet requirement, be characterized in that, when the timing of acceleration increment Delta a mono-, angle theta is bigger, then corresponding increment Delta θ
It is bigger, that is to say, that to choose larger angle theta, the requirement of the Angle Position resolution ratio to being servo-actuated platform 2 can be reduced.
However, when the Angle Position resolution ratio of servo-actuated platform 2 disclosure satisfy that increment Delta θ requirement, then choosing less increment
Δ θ can reduce angle theta, it is to avoid the uncertainty and unstability brought when angle theta is close to 90 °.
It can also be seen that and the accelerometer resolution test side based on gravitational field 1g tumbling test equipment by 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 directly change Δ a magnitude.
Specific method step based on double measurement of centrifuge accelerometer resolution ratio is as follows：
1. upper electricity, back to zero are carried out to servo-actuated platform 2, servo-actuated platform is positioned at zero-bit；
2. by installs fixture, on the rotary table top that accelerometer is fixed to servo-actuated platform 2, the matter of accelerometer is made as far as possible
The line of amount center and the servo-actuated pivot of platform 2 perpendicular to servo-actuated platform 2 table top, while make the direction of accelerometer sensitive axle with
The direction of centrifugal acceleration when speed stabilizing platform 1 rotates is vertical；
3. the electrical connection needed for accelerometer test is completed；
4. according to the resolution ratio and its test request of accelerometer to be measured, Δ a magnitude is determined；
5. according to formula (1), for the Δ a of any determination, it can obtain many by the different values of a, θ, tri- variables of Δ θ
Group disclosure satisfy that Δ a numerical value group；
6. according to fixed (a0, θ0, Δ θ0) value, the orientation angle of servo-actuated platform 2 is adjusted to θ0, the double centrifugations of setting
The output acceleration of machine is a0, i.e., the centrifugal acceleration that speed stabilizing platform 1 is produced at servo-actuated platform 2 is a0, record the defeated of accelerometer
Go out value U0；
7. according to corresponding angle step Δ θ0Servo-actuated platform 2 is rotated, the output of testing acceleration meter is incrementally tested 3 times altogether
More than, record the accelerometer output valve U of each time1、U2... Un (n is the number of times incrementally tested)；
In incremental 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. calculate servo-actuated platform 2 and be positioned at different angle brief acceleration meter reality output increment Delta Up=Un-Un-1；Solve and accelerate
When degree meter corresponds to Δ a input in the ideal case, its preferable output increment Δ U=K* Δs a, K is the scale of accelerometer
Factor；
When incremental test obtains multigroup output increment, its average value can be taken；
9. Δ U is judgedpWhether/Δ U >=50% meets, if it is satisfied, then the resolution ratio of accelerometer reaches Δ a resolution
Rate requirement.
Based on the present invention, it is being servo-actuated the centrifugal acceleration a produced on platform 2 by considering speed stabilizing platform 1, is being servo-actuated determining for platform
Parallactic angle degree (i.e. accelerometer sensitive axle and the angle between the straight line of radial direction centrifugal acceleration) θ and corresponding angle
Tri- variables of increment Delta θ, the detection calibration to low g value or accelerometer with high g values resolution ratio can be realized simultaneously, meanwhile, it is right
In the Δ a of any determination, multigroup (a, θ, Δ θ) value that disclosure satisfy that Δ a requirements can be all obtained, according to the resolution ratio of accelerometer
The condition of calibration value or test equipment, chooses (a, θ, the Δ θ) value for being best suitable for operation, with higher flexibility, moreover, only
Need to can be achieved with using double centrifuges and fixture, without gravitational field 1g tumbling test equipment, reduce the hardware cost of test.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality
Apply 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, the scope of this specification record is all considered to be.
Embodiment described above only expresses the several embodiments of the present invention, and it describes more specific and detailed, but simultaneously
Can not therefore it be construed as limiting the scope of the patent.It should be pointed out that coming for one of ordinary skill in the art
Say, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the present invention
Scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (10)
1. a kind of method of testing of accelerometer resolution ratio, it is characterised in that comprise the following steps：
On the rotary table top from centrifuge that accelerometer is horizontally arranged to double centrifuges, wherein, it is described to be set from centrifuge
On the rotary table top of the main centrifuge of described pair of centrifuge, the main centrifuge and the equal water of the rotary table top from centrifuge
It is flat to set；
The aimed acceleration increment size of the accelerometer is chosen according to the resolution ratio calibration value of the accelerometer, according to described
Aimed acceleration increment size choose the main centrifuge the target centrifugal acceleration produced from centrifuge, it is described plus
The target susceptibility shaft angle angle value of speedometer and the target susceptibility shaft angle degree increment size of the accelerometer；Wherein, the sensitive axes
Sensitive axes of the angle for the accelerometer and the angle angle with reference to straight line, the reference straight line is perpendicular to the main centrifuge
Pivot and the pivot from centrifuge line；
The sensitive axes angle value of the accelerometer is set to reach the target susceptibility axle from the rotary table top of centrifuge described in rotation
Angle value, operates the main centrifuge according to the target centrifugal acceleration, records the first output valve of the accelerometer；
From the rotary table top of centrifuge according to rotating the target susceptibility shaft angle degree increment size, 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
Idea output under the conditions of the value input accelerometer, if the ratio of the output difference and the idea output is more than
Preset value, then judge that the resolution test of the accelerometer passes through.
2. the method for testing of accelerometer resolution ratio according to claim 1, it is characterised in that the aimed acceleration increases
Value, the target centrifugal acceleration, the target susceptibility shaft angle angle value and the target susceptibility shaft angle degree increment size are met
Following relationship：
Δ a=a [sin (θ+Δ θ)-sin θ]
In formula, Δ a represents the aimed acceleration increment size, and a represents the target centrifugal acceleration, and θ represents the target
Sensitive axes angle value, Δ θ represents the target susceptibility shaft angle degree increment size.
3. the method for testing of accelerometer resolution ratio according to claim 1, it is characterised in that described according to the target
Acceleration increment size chooses the main centrifuge in the target centrifugal acceleration produced from centrifuge, the acceleration
The step of target susceptibility shaft angle degree increment size of the target susceptibility shaft angle angle value of meter and the accelerometer, comprises the following steps：
Multigroup target data is chosen according to the aimed acceleration increment size, 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 increment size；
It is described calculate between second output valve and first output valve output difference the step of comprise the following steps：
The output difference between second output valve and first output valve is calculated under different groups of target datas, institute is calculated
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 more than preset value,
The ratio of increment size is more than preset value.
4. the method for testing of accelerometer resolution ratio according to claim 3, it is characterised in that target data described in each group
In the target centrifugal acceleration it is identical.
5. the method for testing of accelerometer resolution ratio according to claim 4, it is characterised in that target data described in each group
After the order arrangement of the target susceptibility shaft angle angle value from small to large, the target susceptibility shaft angle degree in previous group target data
Value and target susceptibility shaft angle degree increment size sum are equal to the target susceptibility shaft angle angle value in later group target data.
6. the method for testing of accelerometer resolution ratio according to claim 1, it is characterised in that described according to the target
Acceleration increment size chooses the main centrifuge in the target centrifugal acceleration produced from centrifuge, the acceleration
The step of target susceptibility shaft angle degree increment size of the target susceptibility shaft angle angle value of meter and the accelerometer, comprises the following steps：
From the Angle Position resolution ratio of centrifuge the sensitive axes angle step is determined according to described.
7. the method for testing of accelerometer resolution ratio as claimed in any of claims 1 to 6, it is characterised in that institute
The mass centre of accelerometer is stated with the line of the pivot from centrifuge perpendicular to the turntable from centrifuge
Face.
8. the method for testing of accelerometer resolution ratio as claimed in any of claims 1 to 6, it is characterised 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
Comprise the following steps before the step of angle value：
By the sensitive axes angle value zero setting of the accelerometer.
9. the method for testing of accelerometer resolution ratio as claimed in any of claims 1 to 6, it is characterised in that institute
It is two or more to state from centrifuge, each described to be symmetrically mounted on from centrifuge on the rotary table top of the main centrifuge.
10. a kind of test device of accelerometer resolution ratio, it is characterised in that including double centrifuges and fixture；
The described pair of centrifuge includes main centrifuge and from centrifuge, the main centrifugation that described pair of centrifuge is arranged on from centrifuge
On the rotary table top of machine, the main centrifuge and the rotary table top from centrifuge are horizontally disposed with；The fixture is arranged on
On the rotary table top from centrifuge, for being horizontally mounted accelerometer；
The aimed acceleration increment size of the accelerometer is chosen according to the resolution ratio calibration value of the accelerometer, according to described
Aimed acceleration increment size choose the main centrifuge the target centrifugal acceleration produced from centrifuge, it is described plus
The target susceptibility shaft angle angle value of speedometer and the target susceptibility shaft angle degree increment size of the accelerometer；Wherein, the sensitive axes
Sensitive axes of the angle for the accelerometer and the angle angle with reference to straight line, the reference straight line is perpendicular to the main centrifuge
Pivot and the pivot from centrifuge line；
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, and institute is operated according to the target centrifugal acceleration
Main centrifuge is stated, the first output valve of the accelerometer is recorded；
From the rotary table top of centrifuge according to rotating the target susceptibility shaft angle degree increment size, 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
Idea output under the conditions of the value input accelerometer, if the ratio of the output difference and the idea output is more than
Preset value, then judge that the resolution test of the accelerometer passes through.
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