CN108051142A - 3 force-measuring type centroid measurement platform multistage integral calibrating methods - Google Patents
3 force-measuring type centroid measurement platform multistage integral calibrating methods Download PDFInfo
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- CN108051142A CN108051142A CN201711245825.XA CN201711245825A CN108051142A CN 108051142 A CN108051142 A CN 108051142A CN 201711245825 A CN201711245825 A CN 201711245825A CN 108051142 A CN108051142 A CN 108051142A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M1/00—Testing static or dynamic balance of machines or structures
- G01M1/12—Static balancing; Determining position of centre of gravity
- G01M1/122—Determining position of centre of gravity
- G01M1/125—Determining position of centre of gravity of aircraft
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Abstract
The invention discloses a kind of 3 force-measuring type centroid measurement platform multistage integral calibrating methods, classification calibration is integrally carried out to barycenter test desk using the standard test weight through metering, then carry out torque accuracy calibrating according to 8 checking methods and weighing precision calibrating is carried out according to multi-times measurement method.The present invention had not only considered demarcates single sensor ignored coupling factor influence respectively, but also avoids frequently dismounting barycenter test desk, so as to improve calibration calibration accuracy and efficiency.
Description
Technical field
The invention belongs to spacecraft technical field of measurement and test, in particular it relates to which a kind of be used for 3 dynamometry
The multistage integral calibrating method of formula centroid measurement platform.
Background technology
Mass property parameter is a series of object mechanics parameters related with quality.Mass property includes quality, matter
Heart position, rotary inertia and the product of inertia compared with given coordinate system are the basic inherent characteristic ginsengs for describing product mechanical characteristic
Number.In the development of spacecraft, it is necessary to by testing to determine these parameters, and must to the progress of these parameters according to design requirement
The adjustment wanted.
3 force-measuring type centroid measurement platforms that the country uses at present measure the quality of spacecraft, centroid position.Three
Point force-measuring type centroid measurement platform structure is as shown in 3 dynamometry barycenter platforms of patent 3*3 formulas.Since sensor becomes after stress
Shape, with the increase of number of use, precision may decline, simultaneously because the high reliability request of space product is, it is necessary to periodically right
Centroid measurement platform is demarcated, examined and determine, to verify whether its precision reaches original design accuracy.Wherein calibration refers to calculate and pass
The code value coefficient of sensor, i.e., the variation of the indicating value (being also code value) after by standard quality pressure and the ratio of standard quality value.Inspection
Surely refer to whether meet required precision by certain method validation centroid measurement platform indices.
The content of the invention
In order to verify whether 3 force-measuring type centroid measurement platform precision reach its nominal precision, the present inventor is whole with multistage
Calibration technique demarcates barycenter test desk, and with 8 Calibration Technologies, torque accuracy determination method, weighing precision judgement side
Method examines equipment precision, so as to complete the present invention.
Present invention employs following technical solutions：
3 force-measuring type centroid measurement platform multistage integral calibrating methods of the present invention, comprise the following steps：
1) after in 3 force-measuring type centroid measurement platforms, installation is complete, first order calibration uses the standard test weight through metering, profit
Positioned with central shaft, be placed on centroid measurement platform, calculate respectively the respective code value increment of three sensors and standard test weight and in
The gross mass of mandrel (is denoted as m1) Mass Distribution on a sensor ratio, be less than m as when test specimen quality1When each sensor
Calibration coefficient；It is equally positioned using central shaft using the standard test weight by metering when the second level is demarcated, is placed on the first order
On standard test weight, the gross mass of the respective code value increment of three sensors and second level standard test weight and central shaft is calculated respectively
(it is denoted as m2) Mass Distribution on a sensor ratio, be more than m as when test specimen quality1Less than m1+m2When each sensor mark
Determine coefficient；And so on, calculate the 6th grade of calibration coefficient of sensor；
2) on the basis of the quality and eccentric moment that measure all standard test weights, with a standard rider, (quality is denoted as m0),
It is placed sequentially on standard test weight eight and is distributed on radius as r0In calibration hole on reference circle, eight position riders are measured respectively
The eccentric moment of generation；
3) with the eccentric moment measured value M of rideri(i=1,2,3 ..., 8) in 0.88m0r0To 1.12m0r0Between, sentence
Fixed 8 points of calibrating eccentric moments size measurement is qualified, i.e., using 8 points of calibrating hole centers as the center of circle, radius r=0.12*r0For radius
A circumference is drawn, does two tangent lines to the circumference from standard rotor center of circle O for starting point, the angle between two tangent lines is torque side
To deviation allowed band, that is, torque direction is measured in αiIt is qualified in the range of ± 6.8 °；If torque size and direction are qualified,
And m0r0Less than centroid measurement platform nominal torque accuracy, then its torque accuracy qualification is judged；
4) to choose the standard test weight of 10%~20% mass of centroid measurement platform range, duplicate measurements three times, measured value with
Standard test weight metered mass maximum measured deviation is denoted as Δ mi(i=1,2,3)；To choose centroid measurement platform range 80%~90%
The standard test weight of quality, three times, measured value is denoted as Δ m with standard test weight metered mass maximum measured deviation for duplicate measurementsi(i=
4,5,6), if Δ mi(i=1 ... 6) is respectively less than the weighing precision of centroid measurement platform nominal, then judges its weighing precision qualification.
Wherein, αi=0 ° of+n × 45 ° n=0,1,2,3,4,5,6,7.
The present invention had not only considered demarcates single sensor ignored coupling factor influence respectively, but also avoids confronting
Heart test desk frequently dismounts, so as to improve calibration calibration accuracy and efficiency.
Specific embodiment
The specific embodiment of the present invention is described in detail below, which is exemplary, not
It is intended to carry out any restriction to protection scope of the present invention.
3 force-measuring type centroid measurement platform multistage integral calibrating methods of the present invention are for existing 3 force-measuring type matter
What heart test desk carried out, including multiple demarcating steps, specifically include procedure below：
Multistage entirety coefficient calibration：
1. measuring barycenter platform zero-bit, three sensor code values are respectively 0,0,0.
2. demarcate first order coefficient.
A) first order standard rotor is lifted into upper barycenter platform, central shaft positioning.
B) computer input rotor standard quality (axis containing centralized positioning) standard value m1=3000kg.
C) computer reads each sensor code value variation after instrument indicating value to be tested is stablized, and is respectively 992,990,1002.
D) each transducer calibration coefficient of the first order is calculated, is respectively 1.008064516 (=m13 ÷ 992 of ÷),
1.01010101 (=m13 ÷ 990 of ÷), 0.998003992 (=m1÷3÷1002)。
3. demarcate second level coefficient.
A) second level standard rotor is lifted on first order rotor, central shaft positioning.
B) rotor quality (axis containing centralized positioning) standard value m is inputted2=3003kg.
C) computer reads each sensor code value variation after instrument indicating value to be tested is stablized, and is respectively 997,993,1005.
D) each transducer calibration coefficient in the second level is calculated, is respectively 1.004012036 (=m23 ÷ 997 of ÷),
1.008056395 (=m23 ÷ 993 of ÷), 0.9960199 (=m2÷3÷1005)。
4. it is carried out successively until the 6th grade.
5. nominal data is deposited and printed.
6. all standard rotors are hung into barycenter platform.
8 Calibration Technologies：
A. computer enters 8 validation programs, measures barycenter platform zero-bit.Three sensor code values are respectively 0,0,0.
B. two standard rotor m are chosen1、m2, gross weight 6003kg, weight weighs the 10% of full scale in equipment
(1700kg) in the range of 90% (15300kg), barycenter platform central shaft positions in lifting.
C. rotor quadrant is aligned with barycenter platform quadrant.
D. it is m to choose a quality0The rider of=0.4kg, travelling radius r0=0.5m by standard rotor upper Positioning holes position
Put decision so that m0r0≤ M (centroid measurement platform nominal torque accuracy, 0.25kgm).
E. the quality of measurement standard rotor and eccentric moment value, deposit after being measured.
F. successively by rider be inserted into standard rotor on reference radius be 0.5m, positioned at 0 °, 45 °, 90 °, 135 °, 180 °,
The location hole of eight on 225 °, 270 °, 315 °, and eccentric moment M is measured respectivelyi(i=1,2,3 ..., 8) are respectively M1=
0.194kgm, M2=0.198kgm, M3=0.212kgm, M4=0.203kgm, M1=0.198kgm, M1=0.189kgm, M1=
0.182kgm, M1=0.187kgm.Torque accuracy determination method：
A. eccentric moment measured value Mi(i=1,2,3 ..., 8) are in 0.88m0r0(=0.176) is to 1.12m0r0(=
0.224) between, 8 points of calibrating eccentric moment size measurements are qualified.
B. eccentric moment direction is respectively 4.5 °, 44.8 °, 90.2 °, 134.0 °, 179.3 °, 225.6 °, 269.8 °,
315.9 °, positioned in αi±6.8°(αi=0 °, 45 °, 90 °, 135 °, 180 °, 225 °, 270 °, 315 °) in the range of, 8 points of calibratings
Eccentric moment orientation measurement is qualified.
C. all qualified then 8 points of calibratings are qualification to torque size and Orientation.
Weighing precision determination method：
A. one or a set of standard rotor is chosen, weight 3000kg weighs the 10%~20% of full scale in equipment, into
Row is weighed, and is repeated 3 times, and records measured value, is respectively 3000.1kg, 2999.8kg, 3000.2kg.Calculate measured value and standard value
Error amount Δ mi(i=1,2,3).
B. one or a set of standard rotor is chosen, weight 15003kg weighs full scale 80%~90% in equipment, into
Row is weighed, and is repeated 3 times, and records measured value, is respectively 15002.8kg, 15003.1kg, 15003.3kg.Calculate measured value and mark
The error amount Δ m of quasi- valuei(i=4,5,6).
C. as Δ mi(i=1 ... 6)≤Δ m (weighing precision of centroid measurement platform nominal is herein 0.5kg), weighing precision
It is qualified.
Technical scheme is described in detail in embodiments described above, it should be understood that described above
Only specific embodiments of the present invention are not intended to limit the invention, it is all done in the spirit of the present invention any repair
Change, supplement or similar fashion substitute etc., should be included within the scope of the present invention.
Claims (2)
1. 3 force-measuring type centroid measurement platform multistage integral calibrating methods, comprise the following steps：
1) after in 3 force-measuring type centroid measurement platforms, installation is complete, first order calibration uses the standard test weight through metering, in utilization
Mandrel positions, and is placed on centroid measurement platform, calculates the respective code value increment of three sensors and standard test weight and central shaft respectively
Gross mass (be denoted as m1) Mass Distribution on a sensor ratio, be less than m as when test specimen quality1When each sensor mark
Determine coefficient；It is equally positioned using central shaft using the standard test weight by metering when the second level is demarcated, is placed on first order standard
On counterweight, the respective code value increment of three sensors and the gross mass of second level standard test weight and central shaft (note are calculated respectively
Make m2) Mass Distribution on a sensor ratio, be more than m as when test specimen quality1Less than m1+m2When each sensor calibration
Coefficient；And so on, calculate the 6th grade of calibration coefficient of sensor；
2) on the basis of the quality and eccentric moment that measure all standard test weights, with a standard rider, (quality is denoted as m0), it puts successively
It puts on standard test weight eight and is distributed on radius as r0In calibration hole on reference circle, measure what eight position riders generated respectively
Eccentric moment；
3) with the eccentric moment measured value M of rideri(i=1,2,3 ..., 8) in 0.88m0r0To 1.12m0r0Between, judge eight
Point calibrating eccentric moment size measurement is qualified, i.e., using 8 points of calibrating hole centers as the center of circle, radius r=0.12*r0It is drawn for radius
One circumference does two tangent lines for starting point from standard rotor center of circle O to the circumference, and the angle between two tangent lines is that torque direction is inclined
Poor allowed band measures torque direction in αiIt is qualified in the range of ± 6.8 °；If torque size and direction are qualified, and
m0r0Less than centroid measurement platform nominal torque accuracy, then its torque accuracy qualification is judged；
4) to choose the standard test weight of 10%~20% mass of centroid measurement platform range, duplicate measurements three times, measured value and standard
Counterweight metered mass maximum measured deviation is denoted as Δ mi(i=1,2,3)；To choose 80%~90% mass of centroid measurement platform range
Standard test weight, three times, measured value and standard test weight metered mass maximum measured deviation are denoted as Δ m for duplicate measurementsi(i=4,5,
6), if Δ mi(i=1 ... 6) is respectively less than the weighing precision of centroid measurement platform nominal, then judges its weighing precision qualification.
2. the method for claim 1, wherein αi=0 ° of+n × 45 ° n=0,1,2,3,4,5,6,7.
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| CN115752898A (en) * | 2022-12-06 | 2023-03-07 | 深圳劢亚科技有限公司 | High-precision mass and mass center testing device for satellite mass characteristic test |
| CN115931223A (en) * | 2022-12-26 | 2023-04-07 | 二重（德阳）重型装备有限公司 | High-precision mass center measurement process method for large special-shaped structural part |
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| CN115931223B (en) * | 2022-12-26 | 2024-05-28 | 二重（德阳）重型装备有限公司 | High-precision centroid measurement process method for large special-shaped structural member |
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