CN108317989B - Mechanical angular position sampling-based dynamic radius measuring method for precision centrifuge - Google Patents
Mechanical angular position sampling-based dynamic radius measuring method for precision centrifuge Download PDFInfo
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- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
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Abstract
The invention provides a mechanical angular position sampling-based dynamic radius measuring method for a precision centrifuge, and belongs to the technical field of measurement of precision instruments. The method comprises the following steps: step one, acquiring and storing dynamic radius reference data of a precision centrifuge by using a micro-displacement sensor according to a set angular position sampling interval; step two, acquiring data detected by the micro-displacement sensor under different rotating speed conditions in real time according to the set angular position sampling intervals under different rotating speed conditions; step three, in a mechanical circumference of the precision centrifuge, calculating the dynamic radius of the precision centrifuge corresponding to the mechanical circumference in real time according to the real-time angular position sampling data and the dynamic radius reference data corresponding to the angular position; and step four, averaging the data of multiple circles under the condition of constant speed to obtain the dynamic radius of the precision centrifuge at the rotating speed. The method provided by the invention effectively reduces the processing difficulty and complexity of the parts in the early stage of measurement, and saves the test time and the test cost.
Description
Technical Field
The invention relates to a mechanical angular position sampling-based dynamic radius measuring method for a precision centrifuge, and belongs to the technical field of measurement of precision instruments.
Background
The precision centrifuge is special large precision test equipment for providing a standard acceleration field for dynamic test, calibration and calibration of an inertial instrument in the aerospace technology. The full-range test of the large-g-value accelerometer is carried out on a precision centrifuge, and the working radius of the centrifuge under each g value must be accurately measured. Generally, the working radius of a centrifuge can be obtained by: when the centrifugal machine is static, calibrating the static radius of the centrifugal machine; when the centrifuge rotates at a constant speed, testing the static radius variation, namely the dynamic radius, of the centrifuge under each g value in real time by a dynamic radius measuring mechanism matched with the centrifuge or the outside of the centrifuge; and adding the static radius and the dynamic radius of the centrifuge to obtain the working radius of the centrifuge under the g value.
In the development process of a precision centrifuge, a commonly adopted scheme for measuring the dynamic radius of the centrifuge in real time is to adopt an external fixedly-mounted non-contact precision micro-displacement sensor, in the measurement process, a sensor detection probe fixedly mounted on an external measurement mechanism is static and motionless, and when the precision centrifuge stably rotates at a constant speed, the measurement of the dynamic radius of the precision centrifuge is realized by measuring the change of the distance between the end part (the end part is processed into a cambered surface to be tested) of the precision centrifuge and the detection probe in real time. Because the requirement on the measurement precision of the dynamic radius of the precision centrifuge is very high, the cambered surface to be tested at the end part of the centrifuge needs to be precisely ground before the measurement by using the scheme, certain flatness and radian are achieved, the distance from the whole cambered surface to be tested to the detection probe is basically unchanged (namely the output of the micro displacement sensor is a constant value), the preparation process and difficulty in the early stage of measurement are greatly increased, and the test time and the test cost are increased.
Disclosure of Invention
On the basis of a dynamic radius measuring mode of a precision centrifuge with a non-contact precision micro-displacement sensor fixedly mounted on the outside, the invention provides a dynamic radius measuring method of the precision centrifuge based on mechanical angle position sampling, aiming at solving the problems that the cambered surface to be tested needs further processing, and the processing procedure is complex and difficult, and the adopted technical scheme is as follows:
a method for measuring the dynamic radius of a precision centrifuge based on mechanical angular position sampling comprises the following specific steps:
step one, acquiring and storing dynamic radius reference data of a precision centrifuge by using a micro-displacement sensor according to a set angular position sampling interval;
step two, acquiring data detected by the micro-displacement sensor under different rotating speed conditions in real time according to the set angular position sampling intervals under different rotating speed conditions;
step three, in a mechanical circumference of the precision centrifuge, calculating the dynamic radius of the precision centrifuge corresponding to the mechanical circumference in real time according to the real-time angular position sampling data and the dynamic radius reference data corresponding to the angular position;
and step four, averaging the data of multiple circles under the condition of constant speed to obtain the dynamic radius of the precision centrifuge at the rotating speed.
Further, the specific process of obtaining the dynamic radius reference data in the first step is as follows:
firstly, the main shaft of the precision centrifuge is divided into omega0The angular velocity of the device runs stably at a constant speed, and dynamic radius reference data are acquired by using a micro-displacement sensor, wherein the dynamic radius reference data acquisition mode is angular position sampling; the angular position sampling means that all data detected by the micro displacement sensors are expressed as a function of the rotating angular position of the precision centrifuge, and the angular position intervals are fixed; angular velocity omega0The value range is as follows: omega0Less than or equal to 6 degrees/second;
second, determining angular velocity ω0The sampling position interval of the corresponding angular position sampling is delta theta;
thirdly, obtaining the number K of sampling points at the angular position corresponding to one mechanical circumference of the precision centrifuge according to the sampling position interval delta theta in the second step0Wherein, K is0360/Delta theta, requirement K0Is a positive integer; the delta theta satisfies that the delta theta is more than or equal to omega0T, T is the time sampling period of the centrifugal machine control system; in addition, in order to increase the number of measurement points, Δ θ is equal to or greater than ω0The value on the basis of T is as small as possible;
and fourthly, storing the dynamic radius reference data acquired in the first step according to the corresponding angular position.
Further, the specific process of acquiring the data detected by the micro-displacement sensor under different rotating speeds in real time in the second step is as follows:
step1, the main shaft of the precision centrifuge is divided into omegaiThe angular velocity of the micro displacement sensor runs stably at a constant speed, and real-time data of the micro displacement sensor are collected, wherein the data collection mode is angular position sampling; wherein i ═1,2,3……；
Step2, determining the angular velocity omegaiSampling position interval of corresponding angular position sampling is Ni·Δθ；
Step 3, according to step2, sampling position interval NiDelta theta obtains the number K of sampling points of an angular position corresponding to one mechanical circumference of the precision centrifugeiWherein, K isi＝360/(NiΔ θ), requirement Ni、KiAre all positive integers, NiIs omegaiCorresponding angular position sampling interval coefficient, N is higher when the rotating speed of the precision centrifugal machine is higheriThe larger the value;
step 4, sampling interval N according to angular positioniDelta theta is used for acquiring real-time data of the micro-displacement sensor and obtaining real-time detection data S of the micro-displacement sensori,j(θAi+(j-1)NiΔ θ), wherein Si，jRepresenting micro-displacement sensor real-time data; thetaAiSampling interval N for the arc surface to be tested of a precision centrifuge at an angular positioniThe first mechanical angular position taken at Δ θ; j is the number of valid test points, and j is 1, 2.
Further, step2 the sampling position interval NiΔ θ satisfies the relationship: n is a radical ofi·Δθ≥ωiT, and NiDelta theta is not more than theta, wherein T is the time sampling period of the precision centrifuge control system, theta is the central angle corresponding to the cambered surface to be tested of the dynamic radius of the centrifuge, and the sampling interval N is based on the angular positioniWhen the Δ θ is used for acquiring real-time data of the micro-displacement sensor, it is ensured that dynamic radius distance change information corresponding to at least one angular position point on the cambered surface to be tested can be measured by the detection probe of the micro-displacement sensor in the process that the precision centrifuge rotates by one mechanical circle.
Further, the dynamic radius calculation process of the precision centrifuge corresponding to the one mechanical circumference in the step three is as follows:
step1, when the main shaft of the centrifugal machine is in omegaiWhen the angular speed is stable and the speed is uniform, the cambered surface to be tested of the precision centrifuge is rotated to enter a measuring area of a detecting probe of the micro-displacement sensor, namely, a central angle theta pairA corresponding angular position region;
step2, real-time data S of the micro-displacement sensor of each angular position sampling pointi,j(θAi+(j-1)NiDelta theta) and each angular position sampling point directly corresponds or differs from the nearest dynamic radius reference data to obtain the output signal voltage difference E of the micro-displacement sensor corresponding to each angular position in a mechanical circumferencei,j(θAi+(j-1)NiΔ θ); wherein E isi，jRepresenting the differential voltage of the output signal of the micro displacement sensor.
The average value of the voltage difference of the output signals of the micro-displacement sensors in one mechanical circumference is calculated and converted into a length dimension, and then the dynamic radius of the precision centrifugal machine in one mechanical circumference is
Wherein l is the number of test turns, C is the scale factor of the micro-displacement sensor, and n is the number of effective angular position test points in the circle center angle region corresponding to theta.
Further, the step four of averaging the data of multiple circles under the uniform speed condition to obtain the dynamic radius of the precision centrifuge at the rotating speed comprises the following specific processes:
step1, repeating the Step three to obtain the main shaft of the precision centrifuge with the omegaiIn the process of stable and uniform operation of 10 mechanical circumferences, the dynamic radius of the precision centrifuge corresponding to each mechanical circumference is stored;
step2, carrying out average processing on the dynamic radii corresponding to the 10 mechanical circumferences obtained in Step1, and obtaining a dynamic radius average value
The mean value is the angular velocity ωiThe dynamic radius of the corresponding precision centrifuge.
Further, the angular position sampling intervals under the different rotation speed conditions in the second step correspond to the following:
when the angular velocity range of the precision centrifuge is as follows: when the angular speed is less than or equal to 6 degrees/second, the angular position sampling interval is 0.025 degrees;
when the angular velocity range of the precision centrifuge is as follows: when the angular speed is more than 6 degrees/second and less than or equal to 180 degrees/second, the angular position sampling interval is 0.05 degrees;
when the angular velocity range of the precision centrifuge is as follows: when the angular speed is more than 180 degrees/second and less than or equal to 360 degrees/second, the angular position sampling interval is 0.1 degree;
when the angular velocity range of the precision centrifuge is as follows: when the angular speed is more than 360 degrees/second and less than or equal to 1080 degrees/second, the sampling interval of the angular positions is 0.25 degrees;
when the angular velocity range of the precision centrifuge is as follows: the angular position sampling interval is 0.5 degrees when 1080 degrees/second < angular velocity.
The invention has the beneficial effects that:
the invention provides a method for measuring the dynamic radius of a precision centrifuge based on mechanical angular position sampling, which is applied to a method for measuring the dynamic radius of the precision centrifuge with a non-contact precision micro-displacement sensor fixedly arranged outside.
Meanwhile, the method for measuring the dynamic radius of the precision centrifuge based on mechanical angular position sampling has higher dynamic radius detection accuracy, effectively reduces detection errors, improves the detection quality of the dynamic radius of the precision centrifuge, and provides a more accurate dynamic radius measurement value for a full-range test of a large-g-value accelerometer on the precision centrifuge.
Drawings
FIG. 1 is a schematic diagram of a scheme for implementing real-time measurement of dynamic radius of a centrifuge by using a non-contact precision micro-displacement sensor fixedly mounted on the outside, wherein O is a rotation axis of the centrifuge, R is a radius of the centrifuge, omega is a rotation angular velocity of the centrifuge, theta is a central angle corresponding to a cambered surface to be tested of the dynamic radius of the centrifuge, and theta is a central angle corresponding to the cambered surface to be tested of the centrifuge1And theta2And the initial and end mechanical angular positions corresponding to the cambered surface to be tested with the dynamic radius are respectively.
Fig. 2 shows the beneficial effects of the present invention, wherein O is the rotation axis of the centrifuge, R is the radius of the centrifuge, and Θ is the central angle corresponding to the cambered surface to be tested of the dynamic radius of the centrifuge. The traditional dynamic radius calculation method requires (or depends on) that the cambered surface to be tested is subjected to precision grinding to meet the radian and flatness requirements (shown by a dotted line in the figure), but the calculation method provided by the invention can be suitable for wider cambered surfaces to be tested (shown by a solid line in the figure) while ensuring the dynamic radius calculation accuracy.
FIG. 3 is a schematic diagram of dynamic radius reference data measurement at low speed (or quasi-static), where θ1And theta2And the initial and ending mechanical angular positions respectively correspond to the cambered surface to be tested with the dynamic radius, and delta theta is a mechanical angular position sampling interval corresponding to the reference data.
FIG. 4 is a schematic diagram of the real-time sampling measurement of dynamic radius at angular position under different rotation speed conditions, where θ1And theta2The initial and end mechanical angular positions, N, respectively corresponding to the dynamic radius cambered surface to be testediDelta theta is the mechanical angular position sampling interval corresponding to the real-time data, thetaAiSampling interval N for cambered surface to be tested at angular positioniFirst mechanical angular position, N, taken at Δ θiThe interval coefficient is sampled for the angular position corresponding to the rotational speed.
Fig. 5 is a set of dynamic radius reference data curves actually acquired based on angular position sampling, and specifically shows a sensor signal corresponding to a complete mechanical circumference, where the abscissa represents a mechanical angle (unit: degree), and the ordinate represents an output voltage signal (unit: V) of the non-contact micro-displacement sensor.
FIG. 6 is a partial enlarged view of a sensor signal corresponding to a fully tested cambered surface with a dynamic radius.
Fig. 7 is a partial enlarged view of sensor signals for achieving measurement of the arc surface to be tested at angular position intervals of 0.025 degree Δ θ.
FIG. 8 is a flowchart illustrating a dynamic radius measurement method according to the present invention.
Detailed Description
The present invention will be further described with reference to the following specific examples, but the present invention is not limited to these examples.
Example 1:
a method for measuring the dynamic radius of a precision centrifuge based on mechanical angular position sampling comprises the following steps:
step one, acquiring and storing dynamic radius reference data of a precision centrifuge by using a micro-displacement sensor according to a set angular position sampling interval;
step two, acquiring data detected by the micro-displacement sensor under different rotating speed conditions in real time according to the set angular position sampling intervals under different rotating speed conditions;
step three, in a mechanical circumference of the precision centrifuge, calculating the dynamic radius of the precision centrifuge corresponding to the mechanical circumference in real time according to the real-time angular position sampling data and the dynamic radius reference data corresponding to the angular position;
and step four, averaging the data of multiple circles under the condition of constant speed to obtain the dynamic radius of the precision centrifuge at the rotating speed.
The method is applied to a dynamic radius measuring mode of a precision centrifuge with a non-contact precision micro-displacement sensor fixedly mounted on the outside, precision grinding of a to-be-tested cambered surface of the precision centrifuge with a large area is not needed, a preparation procedure in the early stage of measurement is simplified to a great extent, the part processing difficulty and complexity in the early stage of measurement are reduced, and the test time and test cost are saved.
Example 2
Example 2 is a further definition of the method for measuring the dynamic radius of the precision centrifuge based on the mechanical angular position sampling described in example 1, and the specific process of the method for measuring the dynamic radius is as follows:
the method comprises the following steps: the main shaft of the precision centrifuge is arranged at omega0The angular velocity of the device runs stably at a constant speed, and dynamic radius reference data are acquired by using a micro-displacement sensor, wherein the dynamic radius reference data acquisition mode is angular position sampling; wherein the angular velocity ω0The value range is as follows: omega0Less than or equal to 6 degrees/second. Determining angular velocity omega0The sampling position interval of the corresponding angular position sampling is delta theta, and the number K of the angular position sampling points corresponding to one mechanical circumference of the precision centrifuge is obtained according to the sampling position interval delta theta0Wherein, K is0360/Delta theta, requirement K0Is a positive integer; the delta theta satisfies that the delta theta is more than or equal to omega0T, T is the time sampling period of the centrifugal machine control system; in addition, in order to increase the number of measurement points, Δ θ is equal to or greater than ω0The value on the basis of T is as small as possible. And storing the collected dynamic radius reference data according to the corresponding angular position.
Step two: the main shaft of the precision centrifuge is arranged at omegaiThe angular velocity of the micro displacement sensor runs stably at a constant speed, and real-time data of the micro displacement sensor are collected, wherein the data collection mode is angular position sampling; wherein i is 1,2,3 … ….
Determining angular velocity omegaiSampling position interval of corresponding angular position sampling is NiΔ θ. Sampling position interval NiΔ θ satisfies the relationship: n is a radical ofi·Δθ≥ωiT, and NiDelta theta is not more than theta, wherein T is the time sampling period of the precision centrifuge control system, theta is the central angle corresponding to the cambered surface to be tested of the dynamic radius of the centrifuge, and the sampling interval N is based on the angular positioniWhen the Δ θ is used for acquiring real-time data of the micro-displacement sensor, it is ensured that dynamic radius distance change information corresponding to at least one angular position point on the cambered surface to be tested can be measured by the detection probe of the micro-displacement sensor in the process that the precision centrifuge rotates by one mechanical circle.
According to the sampling position interval NiDelta theta obtains the number K of sampling points of an angular position corresponding to one mechanical circumference of the precision centrifugeiWherein, K isi＝360/(NiΔ θ), requirement Ni、KiAre all positive integers, NiIs omegaiCorresponding angular position sampling interval coefficient, N is higher when the rotating speed of the precision centrifugal machine is higheriThe larger the value.
Sampling interval N according to angular positioniDelta theta is used for acquiring real-time data of the micro-displacement sensor and obtaining micro-displacementReal-time detection data S of sensori,j(θAi+(j-1)NiΔ θ), wherein Si，jRepresenting micro-displacement sensor real-time data; thetaAiSampling interval N for the arc surface to be tested of a precision centrifuge at an angular positioniThe first mechanical angular position taken at Δ θ; j is the number of valid test points, and j is 1, 2.
Step three: when the main shaft of the centrifuge is in omegaiWhen the angular velocity is stable and operates at a uniform speed, the cambered surface to be tested of the precision centrifuge is rotated to enter a measuring area of a detection probe of the micro-displacement sensor, namely an angular position area corresponding to a central angle theta (as shown in fig. 1 and fig. 2, wherein theta is equal to theta)2-θ1) Wherein, theta1≤θ≤θ2Theta is the mechanical angular position corresponding to the current rotation of the centrifuge, theta1And theta2The initial and cut-off angle positions corresponding to the cambered surface to be tested.
Real-time data S of micro-displacement sensor of each angular position sampling pointi,j(θAi+(j-1)NiDelta theta) and each angular position sampling point directly corresponds or differs from the nearest dynamic radius reference data to obtain the output signal voltage difference E of the micro-displacement sensor corresponding to each angular position in a mechanical circumferencei,j(θAi+(j-1)NiΔ θ); wherein E isi，jRepresenting the differential voltage of the output signal of the micro displacement sensor. The average value of the voltage difference of the output signals of the micro-displacement sensors in one mechanical circumference is calculated and converted into a length dimension, and then the dynamic radius of the precision centrifugal machine in one mechanical circumference is
Wherein l is the number of test turns, C is the scale factor of the micro-displacement sensor, and n is the number of effective angular position test points in the circle center angle region corresponding to theta.
Step four: repeating the step three to obtain the omega of the main shaft of the precision centrifugeiIn the process of stable and uniform operation of 10 mechanical circumferences, the dynamic radius of the precision centrifuge corresponding to each mechanical circumference is stored; the obtained dynamic radiuses corresponding to the 10 mechanical circumferences are subjected to mean value processing, andobtaining a dynamic radius mean
The mean value is the angular velocity ωiThe dynamic radius of the corresponding precision centrifuge.
And step two, the angular position sampling intervals under different rotating speed conditions correspond to the following steps:
when the angular velocity range of the precision centrifuge is as follows: when the angular speed is less than or equal to 6 degrees/second, the angular position sampling interval is 0.025 degrees;
when the angular velocity range of the precision centrifuge is as follows: when the angular speed is more than 6 degrees/second and less than or equal to 180 degrees/second, the angular position sampling interval is 0.05 degrees;
when the angular velocity range of the precision centrifuge is as follows: when the angular speed is more than 180 degrees/second and less than or equal to 360 degrees/second, the angular position sampling interval is 0.1 degree;
when the angular velocity range of the precision centrifuge is as follows: when the angular speed is more than 360 degrees/second and less than or equal to 1080 degrees/second, the sampling interval of the angular positions is 0.25 degrees;
when the angular velocity range of the precision centrifuge is as follows: the angular position sampling interval is 0.5 degrees when 1080 degrees/second < angular velocity. The sampling interval of the specific angular position is shown in table 1, the data of the micro-displacement sensor under different rotating speeds are collected in real time, and the dynamic radius of the precision centrifuge is obtained according to the method provided by the patent.
TABLE 1 angular position sampling intervals under different rotation speed conditions
The method is applied to a dynamic radius measuring mode of a precision centrifuge with a non-contact precision micro-displacement sensor fixedly mounted on the outside, precision grinding is not needed to be carried out on a cambered surface to be tested of the precision centrifuge with a large area, the preparation procedure of the early stage of measurement is greatly simplified, the processing difficulty and complexity of parts of the early stage of measurement are reduced, and the test time and the test cost are saved.
The method for measuring the dynamic radius of the precision centrifuge based on mechanical angular position sampling has high dynamic radius detection accuracy, effectively reduces detection errors, improves the detection quality of the dynamic radius of the precision centrifuge, and provides a more accurate dynamic radius measurement value for a full-range test of a large-g-value accelerometer on the precision centrifuge.
Example 3
With a certain type of precision centrifuge as background, the highest rotation speed of the system is 1800 DEG/s, the time sampling period T of the control system is 0.0002 seconds, and the quasi-static angular velocity omega is selected0When the micro-displacement sensor operates at a stable constant speed, the micro-displacement sensor output reference voltage data corresponding to one mechanical circumference is acquired, as shown in fig. 5 to 7. The data acquisition mode is angular position sampling, because of omega0T is 0.0012 degrees, therefore, the mechanical angular position sampling position interval Δ θ is 0.025 degrees, and the number of sampling points corresponding to one mechanical circumference is K014400. The sample point intervals can be selected as described in table 1 above.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (4)
1. A method for measuring the dynamic radius of a precision centrifuge based on mechanical angular position sampling is characterized by comprising the following specific steps:
step one, acquiring and storing dynamic radius reference data of a precision centrifuge by using a micro-displacement sensor according to a set angular position sampling interval;
step two, according to the set sampling intervals of the angular positions under different rotating speed conditions, the specific process of collecting the data detected by the micro-displacement sensor under different rotating speed conditions in real time is as follows:
step1, the main shaft of the precision centrifuge is divided into omegaiIs in stable and uniform angular velocityThe method comprises the following steps of acquiring real-time data of the micro displacement sensor, wherein the real-time data of the micro displacement sensor is acquired in an angular position sampling mode; wherein i is 1,2,3 … …;
step2, determining the angular velocity omegaiSampling position interval of corresponding angular position sampling is Ni·Δθ；
Step 3, according to step2, sampling position interval NiDelta theta obtains the number K of sampling points of an angular position corresponding to one mechanical circumference of the precision centrifugeiWherein, K isi＝360/(NiΔ θ), requirement Ni、KiAre all positive integers, NiIs omegaiCorresponding angular position sampling interval coefficient, N is higher when the rotating speed of the precision centrifugal machine is higheriThe larger the value;
step 4, sampling interval N according to angular positioniDelta theta is used for acquiring real-time data of the micro-displacement sensor and obtaining real-time detection data S of the micro-displacement sensori,j(θAi+(j-1)NiΔ θ), wherein Si，jRepresenting micro-displacement sensor real-time data; thetaAiSampling interval N for the arc surface to be tested of a precision centrifuge at an angular positioniThe first mechanical angular position taken at Δ θ; j is the number of valid test points, and j is 1, 2.;
step three, in a mechanical circumference of the precision centrifuge, calculating the dynamic radius of the precision centrifuge corresponding to the mechanical circumference in real time according to the real-time angular position sampling data and the dynamic radius reference data corresponding to the angular position,
step1, when the main shaft of the centrifugal machine is in omegaiWhen the angular speed is stable and the angular speed is in uniform operation, the cambered surface to be tested of the precision centrifuge is rotated to enter a measuring area of a detecting probe of the micro-displacement sensor, namely an angular position area corresponding to the central angle theta;
step2, real-time data S of the micro-displacement sensor of each angular position sampling pointi,j(θAi+(j-1)NiDelta theta) and each angular position sampling point directly corresponds or differs from the nearest dynamic radius reference data to obtain the output signal voltage difference E of the micro-displacement sensor corresponding to each angular position in a mechanical circumferencei,j(θAi+(j-1)NiΔ θ); wherein E isi，jRepresenting the voltage difference of the output signals of the micro displacement sensor; the average value of the voltage difference of the output signals of the micro-displacement sensors in one mechanical circumference is calculated and converted into a length dimension, and then the dynamic radius of the precision centrifugal machine in one mechanical circumference is
Wherein l is the number of test turns, C is the scale factor of the micro-displacement sensor, and n is the number of effective angular position test points in the circle center angle region corresponding to theta;
step four, averaging the data of multiple circles under the condition of constant speed to obtain the dynamic radius of the precision centrifuge under the corresponding rotating speed comprises the following specific processes:
step1, repeating the Step three to obtain the main shaft of the precision centrifuge with the omegaiIn the process of stable and uniform operation of 10 mechanical circumferences, the dynamic radius of the precision centrifuge corresponding to each mechanical circumference is stored;
step2, carrying out average processing on the dynamic radii corresponding to the 10 mechanical circumferences obtained in Step1, and obtaining a dynamic radius average value
The mean value is the angular velocity ωiThe dynamic radius of the corresponding precision centrifuge.
2. The method for measuring the dynamic radius of the precision centrifuge as claimed in claim 1, wherein the specific process of obtaining the dynamic radius reference data in the first step is as follows:
firstly, the main shaft of the precision centrifuge is divided into omega0The angular velocity of the device runs stably at a constant speed, and dynamic radius reference data are acquired by using a micro-displacement sensor, wherein the dynamic radius reference data acquisition mode is angular position sampling; wherein the angular velocity ω0The value range is as follows: omega0Less than or equal to 6 degrees/second;
second, determining angular velocity ω0The sampling position interval of the corresponding angular position sampling is delta theta;
thirdly, obtaining the number K of sampling points at the angular position corresponding to one mechanical circumference of the precision centrifuge according to the sampling position interval delta theta in the second step0Wherein, K is0360/Delta theta, requirement K0Is a positive integer; the delta theta satisfies that the delta theta is more than or equal to omega0T, T is the time sampling period of the centrifugal machine control system;
and fourthly, storing the dynamic radius reference data acquired in the first step according to the corresponding angular position.
3. The method for measuring the dynamic radius of a precision centrifuge as claimed in claim 1, wherein the sampling position interval N in step2 isiΔ θ satisfies the relationship: n is a radical ofi·Δθ≥ωiT, and NiDelta theta is not more than theta, wherein T is the time sampling period of the precision centrifuge control system, theta is the central angle corresponding to the cambered surface to be tested of the dynamic radius of the centrifuge, and the sampling interval N is based on the angular positioniWhen the Δ θ is used for acquiring real-time data of the micro-displacement sensor, it is ensured that dynamic radius distance change information corresponding to at least one angular position point on the cambered surface to be tested can be measured by the detection probe of the micro-displacement sensor in the process that the precision centrifuge rotates by one mechanical circle.
4. The method for measuring the dynamic radius of the precision centrifuge as claimed in claim 1, wherein the angular position sampling intervals under the different rotation speed conditions in step two correspond to the following:
when the angular velocity range of the precision centrifuge is as follows: when the angular speed is less than or equal to 6 degrees/second, the angular position sampling interval is 0.025 degrees;
when the angular velocity range of the precision centrifuge is as follows: when the angular speed is more than 6 degrees/second and less than or equal to 180 degrees/second, the angular position sampling interval is 0.05 degrees;
when the angular velocity range of the precision centrifuge is as follows: when the angular speed is more than 180 degrees/second and less than or equal to 360 degrees/second, the angular position sampling interval is 0.1 degree;
when the angular velocity range of the precision centrifuge is as follows: when the angular speed is more than 360 degrees/second and less than or equal to 1080 degrees/second, the sampling interval of the angular positions is 0.25 degrees;
when the angular velocity range of the precision centrifuge is as follows: the angular position sampling interval is 0.5 degrees when 1080 degrees/second < angular velocity.
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| CN109556496B (en) * | 2018-11-22 | 2020-10-23 | 北京航天计量测试技术研究所 | Device and method for ensuring consistency of working radius of centrifugal machine |
| CN110345838B (en) * | 2018-12-21 | 2020-12-18 | 哈尔滨工业大学 | Method for measuring working radius of four-axis centrifugal machine |
| CN111947683B (en) * | 2020-07-17 | 2022-07-05 | 北京航天控制仪器研究所 | Off-line measurement and on-line compensation method and device for radius error of precision centrifuge |
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| CN101639337B (en) * | 2009-09-07 | 2011-04-27 | 北京航天控制仪器研究所 | Real-time measurement method of dynamic radius and dynamic misalignment angle of precision centrifuge and device thereof |
| JP2013024754A (en) * | 2011-07-22 | 2013-02-04 | Daido Steel Co Ltd | Object diameter measurement method |
| CN102654384B (en) * | 2012-04-19 | 2014-04-16 | 中国工程物理研究院总体工程研究所 | Dynamic radius positioning direct measurement method of rotary-platform-type precision centrifugal machine |
| CN104748913A (en) * | 2015-04-09 | 2015-07-01 | 哈尔滨工业大学 | Double freedom degree precision centrifuge spindle dynamic unbalance scale identification method based on micro displacement sensor |
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