CN102654384A - Dynamic radius positioning direct measurement method of rotary-platform-type precision centrifugal machine - Google Patents
Dynamic radius positioning direct measurement method of rotary-platform-type precision centrifugal machine Download PDFInfo
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- CN102654384A CN102654384A CN2012101163098A CN201210116309A CN102654384A CN 102654384 A CN102654384 A CN 102654384A CN 2012101163098 A CN2012101163098 A CN 2012101163098A CN 201210116309 A CN201210116309 A CN 201210116309A CN 102654384 A CN102654384 A CN 102654384A
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Abstract
The invention discloses a dynamic radius positioning direct measurement method of a rotary-platform-type precision centrifugal machine. The method comprises the following steps of: measuring the radial run-out of the end face of a rotary platform, and recording the value as b0mm; recording the installation position of an accelerometer on the rotary platform as point A, and defining a point B and a point C on the rotary platform; intersecting a straight line BC with the end face of the rotary platform so as to form a point D and a point E; processing a groove in the vertical direction by respectively taking a vertical line of the point D and a vertical line of the point E as a center line; installing a fixed support and a capacitor-type position measuring sensor, wherein the capacitor-type position measuring sensor directly faces the end face of the rotary platform; rotating the rotary platform so as to obtain a collected result, and recording as a sequence Mi; analyzing the sequence Mi; repeating the test to complete the measurement of the dynamic radius of the rotary-platform-type precision centrifugal machine. According to the invention, the uncertain degree introduced by a to-be-measured installation block is eliminated without the use of the to-be-measured installation block; a single sensor is adopted for continuous measurement, the structure of a measurement system is simplified, the possibility of the measurement uncertain degree introduced by other links is reduced, and the measurement accuracy is improved obviously.
Description
Technical field
The present invention relates to a kind of turntable type precision centrifuge Dynamic Radius measuring method, relate in particular to and a kind of tested mounting blocks, high-precision turntable type precision centrifuge Dynamic Radius location direct measuring method need not be installed.
Background technology
Precision centrifuge is to be used for demarcating and one of instrument of calibration to accelerometer, it be through centripetal acceleration as input quantity, and the various performance parameters of testing acceleration meter realizes.According to its principle of work, the major influence factors of calculating and weigh centripetal acceleration comprises Dynamic Radius, dynamic misalignment angle, rotating speed etc.
Traditional turntable type precision centrifuge Dynamic Radius measuring method is: transducer for measuring positions such as condenser type, inductance type, laser type are installed on turntable or the fixed support, tested mounting blocks are installed, in order to the radius of indirect measurement turntable again on the hydro-extractor turntable; Measure the preferred site point triggering mode that account form has, promptly trigger sampled signal, the mode of selecting the continuous acquisition averaged for use that has in the specific several position of turntable.
The shortcoming of traditional turntable type precision centrifuge Dynamic Radius measuring method is:
1, the variable quantity of tested mounting blocks in order to indirect measurement centrifuge radius is installed on the centrifuge turntable; Because under different centrifugal accelerations; The fixedly connected mode of tested mounting blocks and turntable, material, volume, shape etc. are different; Can cause the location variation of location variation and turntable radius of tested mounting blocks inconsistent, can introduce error the accurate measurement of precision centrifuge Dynamic Radius;
2, precision centrifuge is used for the demarcation and the calibration of accelerometer; Corresponding turntable radial end face position should be installed by accelerometer in the measuring position of its Dynamic Radius on turntable; The Dynamic Radius value of all the other position measurements can only reflect the variation tendency of precision centrifuge turntable Dynamic Radius; The Dynamic Radius that can not accurately weigh the turntable radial end face position of accelerometer installation correspondence on the turntable changes; The location point of the Dynamic Radius that classic method is measured is chosen more, not only in turntable radial end face position, introduces error so can demarcate with the calibrating acceleration meter precision centrifuge; And because the accelerometer installation site often has and debugs the parts that platform, sectional fixture etc. are different from other position, the Dynamic Radius that its quality difference is brought changes difference and also should not ignore;
3, select for use triggering mode to measure the serviceability of meeting impact position sensor; Adopt the location triggered mode to measure Dynamic Radius and can make transducer for measuring positions be in the discontinuous operation state always, be unfavorable for the stable and work of sensor performance, can the precision of measuring be exerted an influence;
4, adopting the mode of continuous acquisition averaged is to have weighed the Dynamic Radius situation of change of precision centrifuge turntable end face on whole circumference; Its reflection be the variation tendency of Dynamic Radius on the whole circumference, the assigned address that can not accurately reflect the turntable end face is the Dynamic Radius situation that accelerometer is installed corresponding turntable radial end face position; On the one hand; Because the difference of installation site quality can bring different Dynamic Radius to change; On the other hand, because there is certain form and position tolerance in the processing of turntable, can introduce rigging error in rotating shaft and the turntable installation process; Therefore the radius of measuring diverse location on the turntable will have bigger difference, thereby makes the measurement of Dynamic Radius produce than large deviation.
Summary of the invention
The object of the invention just is that providing a kind of in order to address the above problem need not install tested mounting blocks, high-precision turntable type precision centrifuge Dynamic Radius location direct measuring method.
In order to achieve the above object, the present invention has adopted following technical scheme:
The turntable upper surface of precision centrifuge according to the invention is positioned at horizontal direction, and the turntable end face of said precision centrifuge is positioned at vertical direction, and the main shaft of said precision centrifuge is positioned at the center of said turntable and is positioned at vertical direction; Measuring method according to the invention may further comprise the steps:
(1) turntable of the said precision centrifuge of hand rotation, and measure the radial run-out of said turntable end face, and write down this and be worth and be b
0Mm;
(2) the accelerometer installation site on the turntable of the said precision centrifuge of note is the A point; The A point is that the position of center half-twist is designated as the B point with the main shaft of said precision centrifuge, and the A point is that the center rotates 270 ° position in the same way and is designated as the C point with the main shaft of said precision centrifuge;
(3) connect said B point and said C point formation straight line BC, two joinings of the crossing formation of the turntable end face of said straight line BC and said precision centrifuge are designated as the D point near what said B was ordered in said two joinings, are designated as the E point near what said C was ordered;
(4) be center line with said D point place perpendicular line and said E point place perpendicular line respectively; On the turntable end face of said precision centrifuge, process the square groove of a vertical direction separately; The width of said square groove horizontal direction is amm; The degree of depth of vertical direction is bmm, and the width of said square groove horizontal direction and the degree of depth of vertical direction satisfy following formula I and formula II simultaneously:
B＞3b
0Formula II
Wherein, f
cBe the Dynamic Radius SF, the Hz of unit, r are said precision centrifuge
The radius of clean-up, the m of unit, n
MaxBe the design maximum (top) speed of said precision centrifuge, the r/min of unit;
(5) at the turntable end face installed beside fixed support of said precision centrifuge, said fixed support can carry out distance adjustment with vertical direction in the horizontal direction, and said fixed support upper end is equipped with the sectional fixture that can be in the horizontal direction rotates with vertical direction;
(6) one of capacitance type transducers for measuring positions is installed on said sectional fixture, the measurement face of said capacitance type transducers for measuring positions is directly faced the center section of the turntable end face of said precision centrifuge;
(7) connect the power supply of said capacitance type transducers for measuring positions, and read the reading of said capacitance type transducers for measuring positions, be designated as Lmm with digital multimeter;
(8) angle of the said capacitance type transducers for measuring positions of adjustment;
(9) distance between the turntable of said capacitance type transducers for measuring positions of adjustment and said precision centrifuge;
(10) before the said precision centrifuge of rotation makes an experiment; At first write down the rotation direction of the initial position and the said precision centrifuge turntable of said precision centrifuge; What said capacitance type transducers for measuring positions was at first passed through in judgement is the D point or the E point of said turntable; And then judge the concrete condition of said accelerometer installation site A point through said capacitance type transducers for measuring positions, said A point is one of following four kinds of circulation patterns: DEADEA through the situation of said capacitance type transducers for measuring positions ..., DAEDAE ..., EDAEDA ..., EADEAD
(11) rotate said precision centrifuge and make an experiment, adopt high-speed data acquistion system to read and write down the feedback numerical value of said capacitance type transducers for measuring positions continuously, collection result is designated as sequence M
i, said sequence M
iAt least include and pick up from each 1 of the sampled data that said D point and said E order, the rotating speed of width and said precision centrifuge turntable that specifically comprises number and said groove is relevant;
(12) analyze said sequence M
i: because said groove causes the distance between said D point and said E point and the said capacitance type transducers for measuring positions bigger; Compared obvious variation with the sampling numerical value that said E is ordered with the sampling numerical value that picks up from other position so pick up from said D point; The said A point of judging in the integrating step (10) can be confirmed said sequence M through the situation of said capacitance type transducers for measuring positions
iIn belong to the numerical value that said A is ordered;
(13) rotating speed of the said precision centrifuge turntable of change, repeating step (10) through writing down the numerical value of said A point under different centrifugal acceleration situation, is accomplished the measurement of said turntable type precision centrifuge Dynamic Radius to step (12).
As preferably, the method for said step (8) may further comprise the steps:
(1) make the unslotted zone of said capacitance type transducers for measuring positions in the face of said turntable end face, regulate said support bracket fastened horizontal level, the reading L that makes said capacitance type transducers for measuring positions fixes said support bracket fastened position this moment near 95% of its maximum range;
(2) keep all the other conditions constant, regulate the vertical direction angle of said sectional fixture, the reading L that makes said capacitance type transducers for measuring positions fixes said sectional fixture this moment near its minimum value;
(3) keep all the other conditions constant, regulate the horizontal direction angle of said sectional fixture, the reading L that makes said capacitance type transducers for measuring positions fixes said sectional fixture this moment near its minimum value.
As preferably, the method for said step (9) is: read the current L reading of said capacitance type transducers for measuring positions, be designated as L
0, L
0Satisfy the condition of following formula III, if do not satisfy the horizontal range of then regulating between said fixed support and the said precision centrifuge till the condition of satisfied following formula III:
L
0＞δ Ka
MaxThe m formula III
In the formula III, m is the gross mass of said turntable, said fixed support, said sectional fixture and said capacitance type transducers for measuring positions, units, a
MaxBe said precision centrifuge design maximum acceleration value, the m/s of unit
2, K is the elasticity coefficient of the turntable material of said precision centrifuge, δ is the safe distance coefficient of Dynamic Radius measuring system, value 3-5.
Particularly, in the said step (12), said sequence M
iIn to belong to the numerical value that said A orders be one or more; When a plurality of, a plurality of said numerical value values of averaging are handled.
Beneficial effect of the present invention is:
The present invention has the following advantages:
1, owing to is not employed in the mode that tested mounting blocks is installed on the turntable; Turntable type precision centrifuge Dynamic Radius has been carried out direct measurement; Eliminated the uncertainty of processing, installation, displacement and the distortion introducing of tested mounting blocks itself; Simplify the measuring system structure, reduced the possibility of introducing uncertainty of measurement by other link of measuring system, improved measuring accuracy;
2, adopt the single-sensor continuous coverage, do not need other part of precision centrifuge that trigger pip is provided, can eliminate the uncertainty that other system introduces effectively;
3, through data collection and analysis at a high speed; Can realize the location survey of precision centrifuge test installation table top position Dynamic Radius; Guarantee that promptly each Dynamic Radius sampled point is at same position; Can eliminate because the uncertainty of turntable processing form and position tolerance, the introducing of turntable rotating shaft rigging error significantly improves measuring accuracy.
Description of drawings
Fig. 1 is a support bracket fastened perspective view according to the invention;
Fig. 2 is the perspective view that precision centrifuge turntable according to the invention and some position thereof are provided with;
Fig. 3 is the main TV structure synoptic diagram that fixed support according to the invention and said precision centrifuge are used.
Embodiment
Below in conjunction with accompanying drawing the present invention is made further specific descriptions:
As shown in figures 1 and 3, there is sectional fixture 1 upper end of fixed support 2 according to the invention, and capacitance type transducers for measuring positions 4 is installed on the sectional fixture 1.As shown in Figure 2, the upper surface of the turntable 3 of precision centrifuge according to the invention is positioned at horizontal direction, and the end face 7 of the turntable 3 of precision centrifuge is positioned at vertical direction, and the main shaft 5 of precision centrifuge is positioned at the center of turntable 3 and is positioned at vertical direction; 8 is the accelerometer installation region among Fig. 2; The accelerometer installation site is the center that the A point is positioned at accelerometer installation region 8, particularly, and in the notion of " A point "; Its area is changeable; Measuring accuracy according to the actual requirements and deciding, but be the standard point of measurements and calculations all the time with its central point, the notion that other B point, C point, D point, E are ordered is identical therewith.
Below in conjunction with Fig. 1, Fig. 2 and Fig. 3 detailed process of the present invention is further described:
(1) turntable 3 of hand rotation precision centrifuge, and measure the radial run-out of the end face 7 of turntable 3, and write down this and be worth and be b
0Mm;
(2) the accelerometer installation site on the turntable 3 of note precision centrifuge is the A point; The A point is that the position of center half-twist is designated as the B point with the main shaft 5 of precision centrifuge; The A point is that the center rotates 270 ° position in the same way and is designated as the C point with the main shaft 5 of precision centrifuge; Above-mentioned sense of rotation can be clockwise or reverse, and present embodiment is for reversing;
(3) connect B point and C point formation straight line BC, be designated as the D point near what B was ordered in two joinings of end face 7 crossing formation of the turntable 3 of straight line BC and precision centrifuge, two joinings, be designated as the E point near what C was ordered;
(4) be center line with D point place perpendicular line and E point place perpendicular line respectively; On the end face 7 of the turntable 3 of precision centrifuge, process the square groove 8 of a vertical direction separately; The width of square groove 8 horizontal directions is amm; The degree of depth of vertical direction is bmm, and the width of square groove 8 horizontal directions and the degree of depth of vertical direction satisfy following formula I and formula II simultaneously:
B＞3b
0Formula II
Wherein, f
cBe the Dynamic Radius SF, the Hz of unit, r are the radius of clean-up of precision centrifuge, the m of unit, n
MaxBe the design maximum (top) speed of precision centrifuge, the r/min of unit;
(5) at the installed beside fixed support 2 of the end face 7 of the turntable 3 of precision centrifuge, fixed support 2 can carry out distance adjustment with vertical direction in the horizontal direction, and the upper end of fixed support 2 is equipped with the sectional fixture 1 that can be in the horizontal direction rotates with vertical direction;
(6) 4 one of capacitance type transducers for measuring positions are installed on sectional fixture 1, the measurement face of capacitance type transducers for measuring positions 4 is directly in the face of the center section of the end face 7 of the turntable 3 of precision centrifuge;
(7) connect the power supply of capacitance type transducers for measuring positions 4, and read the reading of capacitance type transducers for measuring positions 4, be designated as Lmm with digital multimeter;
(8) make the unslotted zone of capacitance type transducers for measuring positions 4 in the face of the end face 7 of turntable 3, regulate the horizontal level of fixed support 2, the reading L that makes capacitance type transducers for measuring positions 4 is near 95% of its maximum range, and this moment is the position of fixed support 2 fixedly;
(9) keep all the other conditions constant, regulate the vertical direction angle of sectional fixture 1, the reading L that makes capacitance type transducers for measuring positions 4 fixedly mounts anchor clamps 1 this moment near its minimum value;
(10) keep all the other conditions constant, regulate the horizontal direction angle of sectional fixture 1, the reading L that makes capacitance type transducers for measuring positions 4 fixedly mounts anchor clamps 1 this moment near its minimum value;
(11) read the current L reading of capacitance type transducers for measuring positions 4, be designated as L
0, L
0Satisfy the condition of following formula III, if do not satisfy the horizontal range of then regulating between fixed support 2 and the precision centrifuge till the condition of satisfied following formula III:
L
0＞δ Ka
MaxThe m formula III
In the formula III, m is the gross mass of turntable 3, fixed support 2, sectional fixture 1 and capacitance type transducers for measuring positions 4, units, a
MaxFor precision centrifuge designs maximum acceleration value, the m/s of unit
2, K is the elasticity coefficient of material of the turntable 3 of precision centrifuge, δ is the safe distance coefficient of Dynamic Radius measuring system, value 3-5;
(12) before the rotation precision centrifuge makes an experiment; At first write down the rotation direction of the initial position and the precision centrifuge turntable 3 of precision centrifuge; What capacitance type transducers for measuring positions 4 was at first passed through in judgement is the D point or the E point of turntable 3; And then judge the concrete condition of accelerometer installation site A point through capacitance type transducers for measuring positions 4, the A point is one of following four kinds of circulation patterns: DEADEA through the situation of capacitance type transducers for measuring positions 4 ..., DAEDAE ..., EDAEDA ..., EADEAD
(13) rotate precision centrifuge and make an experiment, adopt high-speed data acquistion system to read and write down the feedback numerical value of capacitance type transducers for measuring positions 4 continuously, collection result is designated as sequence M
i, sequence M
iAt least include and pick up from each 1 of the sampled data that D point and E order, the rotating speed of width and precision centrifuge turntable 3 that specifically comprises number and groove 6 is relevant;
(14) analytical sequence M
i: because groove 6 causes the distance between D point and E point and the capacitance type transducers for measuring positions 4 bigger; Compared obvious variation with the sampling numerical value that E is ordered with the sampling numerical value that picks up from other position so pick up from the D point; The A point of judging in the integrating step (12) can be confirmed sequence M through the situation of capacitance type transducers for measuring positions 4
iIn belong to the numerical value that A is ordered; Sequence M
iIn to belong to the numerical value that A orders be one or more; When a plurality of, a plurality of numerical value values of averaging are handled;
(15) rotating speed of change precision centrifuge turntable 3, repeating step (12) through the numerical value of record A point under different centrifugal acceleration situation, are accomplished the measurement of turntable type precision centrifuge Dynamic Radius to step (14).
In the said process, do not adopt the tested mounting blocks in the classic method, eliminated the uncertainty that tested mounting blocks itself is introduced; Adopt a capacitance type transducers for measuring positions 4 directly in the face of the end face 6 of precision centrifuge turntable 3 carries out continuous coverage, simplified the measuring system structure, reduced the possibility of other link introducing uncertainty of measurement, significantly improved measuring accuracy.
Claims (4)
1. a turntable type precision centrifuge Dynamic Radius is located direct measuring method; The turntable upper surface of said precision centrifuge is positioned at horizontal direction; The turntable end face of said precision centrifuge is positioned at vertical direction, and the main shaft of said precision centrifuge is positioned at the center of said turntable and is positioned at vertical direction; It is characterized in that: said measuring method may further comprise the steps:
(1) turntable of the said precision centrifuge of hand rotation, and measure the radial run-out of said turntable end face, and write down this and be worth and be b
0Mm;
(2) the accelerometer installation site on the turntable of the said precision centrifuge of note is the A point; The A point is that the position of center half-twist is designated as the B point with the main shaft of said precision centrifuge, and the A point is that the center rotates 270 ° position in the same way and is designated as the C point with the main shaft of said precision centrifuge;
(3) connect said B point and said C point formation straight line BC, two joinings of the crossing formation of the turntable end face of said straight line BC and said precision centrifuge are designated as the D point near what said B was ordered in said two joinings, are designated as the E point near what said C was ordered;
(4) be center line with said D point place perpendicular line and said E point place perpendicular line respectively; On the turntable end face of said precision centrifuge, process the square groove of a vertical direction separately; The width of said square groove horizontal direction is amm; The degree of depth of vertical direction is bmm, and the width of said square groove horizontal direction and the degree of depth of vertical direction satisfy following formula I and formula II simultaneously:
B＞3b
0Formula II
Wherein, f
cBe the Dynamic Radius SF, the Hz of unit, r are the radius of clean-up of said precision centrifuge, the m of unit, n
MaxBe the design maximum (top) speed of said precision centrifuge, the r/min of unit;
(5) at the turntable end face installed beside fixed support of said precision centrifuge, said fixed support can carry out distance adjustment with vertical direction in the horizontal direction, and said fixed support upper end is equipped with the sectional fixture that can be in the horizontal direction rotates with vertical direction;
(6) one of capacitance type transducers for measuring positions is installed on said sectional fixture, the measurement face of said capacitance type transducers for measuring positions is directly faced the center section of the turntable end face of said precision centrifuge;
(7) connect the power supply of said capacitance type transducers for measuring positions, and read the reading of said capacitance type transducers for measuring positions, be designated as Lmm with digital multimeter;
(8) angle of the said capacitance type transducers for measuring positions of adjustment;
(9) distance between the turntable of said capacitance type transducers for measuring positions of adjustment and said precision centrifuge;
(10) before the said precision centrifuge of rotation makes an experiment, at first write down the rotation direction of the initial position and the said precision centrifuge turntable of said precision centrifuge, judge at first and survey through said condenser type
Level sensor be the D point or the E point of said turntable; And then judge the concrete condition of said accelerometer installation site A point through said capacitance type transducers for measuring positions, said A point is one of following four kinds of circulation patterns: DEADEA through the situation of said capacitance type transducers for measuring positions ..., DAEDAE ..., EDAEDA ..., EADEAD
(11) rotate said precision centrifuge and make an experiment, adopt high-speed data acquistion system to read and write down the feedback numerical value of said capacitance type transducers for measuring positions continuously, collection result is designated as sequence M
i, said sequence M
iAt least include and pick up from each 1 of the sampled data that said D point and said E order, the rotating speed of width and said precision centrifuge turntable that specifically comprises number and said groove is relevant;
(12) analyze said sequence M
i: because said groove causes the distance between said D point and said E point and the said capacitance type transducers for measuring positions bigger; Compared obvious variation with the sampling numerical value that said E is ordered with the sampling numerical value that picks up from other position so pick up from said D point; The said A point of judging in the integrating step (10) can be confirmed said sequence M through the situation of said capacitance type transducers for measuring positions
iIn belong to the numerical value that said A is ordered;
(13) rotating speed of the said precision centrifuge turntable of change, repeating step (10) through writing down the numerical value of said A point under different centrifugal acceleration situation, is accomplished the measurement of said turntable type precision centrifuge Dynamic Radius to step (12).
2. turntable type precision centrifuge Dynamic Radius according to claim 1 location direct measuring method, it is characterized in that: the method for said step (8) may further comprise the steps:
(1) make the unslotted zone of said capacitance type transducers for measuring positions in the face of said turntable end face, regulate said support bracket fastened horizontal level, the reading L that makes said capacitance type transducers for measuring positions fixes said support bracket fastened position this moment near 95% of its maximum range;
(2) keep all the other conditions constant, regulate the vertical direction angle of said sectional fixture, the reading L that makes said capacitance type transducers for measuring positions fixes said sectional fixture this moment near its minimum value;
(3) keep all the other conditions constant, regulate the horizontal direction angle of said sectional fixture, the reading L that makes said capacitance type transducers for measuring positions fixes said sectional fixture this moment near its minimum value.
3. turntable type precision centrifuge Dynamic Radius according to claim 1 location direct measuring method, it is characterized in that: the method for said step (9) is: read the current L reading of said capacitance type transducers for measuring positions, be designated as L
0, L
0Satisfy the condition of following formula III, if do not satisfy the horizontal range of then regulating between said fixed support and the said precision centrifuge till the condition of satisfied following formula III:
L
0＞δ Ka
MaxThe m formula III
In the formula III, m is the gross mass of said turntable, said fixed support, said sectional fixture and said capacitance type transducers for measuring positions, units, a
MaxBe said precision centrifuge design maximum acceleration value, the m/s of unit
2, K is the elasticity coefficient of the turntable material of said precision centrifuge, δ is the safe distance coefficient of Dynamic Radius measuring system, value 3-5.
4. turntable type precision centrifuge Dynamic Radius according to claim 1 location direct measuring method is characterized in that: in the said step (12), and said sequence M
iIn to belong to the numerical value that said A orders be one or more; When a plurality of, a plurality of said numerical value values of averaging are handled.
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| CN104567656A (en) * | 2014-12-24 | 2015-04-29 | 格力电器（合肥）有限公司 | Impeller detection device |
| CN107932168A (en) * | 2017-12-07 | 2018-04-20 | 中国船舶重工集团公司第七六研究所 | A kind of progressive rotation type loading and unloading buffer storage and its control method |
| CN108168487A (en) * | 2017-12-29 | 2018-06-15 | 哈尔滨工大航博科技有限公司 | A kind of arm-type precision centrifuge Dynamic Radius measuring mechanism |
| CN108168487B (en) * | 2017-12-29 | 2021-06-29 | 哈尔滨工大航博科技有限公司 | Dynamic radius measuring mechanism of arm type precision centrifuge |
| CN108317989A (en) * | 2018-01-26 | 2018-07-24 | 哈尔滨工大航博科技有限公司 | A kind of precision centrifuge Dynamic Radius measurement method based on the sampling of mechanical Angle Position |
| CN109556496A (en) * | 2018-11-22 | 2019-04-02 | 北京航天计量测试技术研究所 | A kind of device and method guaranteeing centrifuge working radius consistency |
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| CN102654384B (en) | 2014-04-16 |
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