Phase synchronization measuring system and measuring method for double-shaft precision centrifugal machine

Abstract

The invention discloses a phase synchronization measuring system and method for a double-shaft precision centrifuge, and relates to the technical field of double-shaft precision centrifuges, a real-time control system comprises an FPGA chip, a high-frequency pulse signal acquisition card and a high-frequency pulse signal sending card, the high-frequency pulse signal acquisition card and the high-frequency pulse signal sending card are connected with the FPGA chip, and the industrial personal computer is connected with the high-frequency pulse signal acquisition card through the Ethernet; the industrial personal computer is also connected with the main shaft servo driver; the high-frequency pulse signal sending card is connected with the slave shaft servo driver, the main shaft incremental circular grating and the slave shaft incremental circular grating are respectively connected with the high-frequency pulse signal acquisition card, and the slave shaft motor and the slave shaft absolute circular grating are respectively connected with the slave shaft servo driver; and the main shaft motor and the main shaft absolute type circular grating are respectively connected with the main shaft servo driver.

Description

technical field [0001] The invention relates to the technical field of a double-shaft precision centrifuge, in particular to a phase synchronization measurement system and a measurement method for a double-shaft precision centrifuge. Background technique [0002] Precision centrifuge is one of the important test instruments used for inertial instrument calibration. Precision centrifuges generally use a disc-type turntable with a large inertia to provide centrifugal force input to the inertial instrument to be tested, and stimulate the high-order error coefficient of the inertial instrument to improve the calibration accuracy of the inertial instrument. When a traditional single-shaft precision centrifuge produces a large centrifugal force output, it also produces a large angular velocity. For the calibration of high-precision inertial instruments that are sensitive to angular velocity, such as gyroscopes, the ideal calibration environment is zero angular velocity input and ...

AI Technical Summary

Problems solved by technology

For the calibration of high-precision inertial instruments that are sensitive to angular velocity, such as gyroscopes, the ideal calibration environment is zero angular velocity input and fixed pointing. Therefore, the large angular velocity input of traditional single-axis precision centrifuges will lead to high-order error models of gyroscopes. Coefficients are difficult to achieve high calibration accuracy

[0003] The traditional dual-axis precision centrifuge only provides zero angular velocity input by reversing the dual-axis at the same speed, but it cannot meet the angular-second level phase-locking control requirements of the dual-axis precision centrifuge during the calibration of high-precision inertial instruments.

The realization of phase lock control depends on the synchronous high-precision measurement of the two-axis phase difference. Due to the influence of electromagnetic radiation and other interference factors under the condition of high-speed centrifuge, the high-frequency pulse signal generated by the circular grating encoder is prone to quality degradation. As a result, the existing shelf products will lose the pulse signal when processing high-frequency pulse signals, which will cause phase measurement errors; at the same time, the frequency of real-time calculation of the phase for existing shelf products is low, and the biaxial phase is measured and calculated. The time synchronization of the phase difference is difficult to meet the index requirements

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