Tail-end-mounted self-correcting high-precision centrifugal machine

Abstract

A self-correcting high-precision centrifugal machine installed at the tail end comprises a mechanical table body and a control cabinet, the mechanical table body comprises a table body frame, a main shaft is installed in the table body frame through a bearing, a motor is installed on the main shaft, an angle resolving encoder is arranged at the lower end of the main shaft, and a sliding ring is arranged in the main shaft; the upper end of the main shaft is connected with a rotary table top arranged above the table body frame; an accelerometer and a load mounting station are arranged on the rotary table top; a centrifugal machine measurement and control system used for controlling the movement of the mechanical table body, an industrial personal computer used for signal acquisition and data processing and a power supply are respectively arranged in the control cabinet, and the centrifugal machine measurement and control system comprises an accelerometer acquisition system used for accelerometer signal acquisition and a driving system used for driving a motor. The device is used for achieving centrifugal machine table top movement, external high-precision acceleration signal collection, data error comparison and high-precision centrifugal force fine adjustment. The device has the characteristics of rapidness and simplicity in operation, high precision and convenience in installation.

Description

technical field [0001] The invention relates to a self-calibrating high-precision centrifuge installed at the end. Background technique [0002] With the rapid development of domestic aviation and aerospace technology, the requirements for the performance and accuracy of navigation equipment continue to increase. Correspondingly, the precision centrifuge is the key detection and calibration equipment for high-precision inertial navigation instruments. High-precision inertial navigation is a navigation parameter calculation system with gyroscopes and accelerometers as sensitive devices. It can calculate its speed and position in the navigation coordinate system according to the output of inertial devices. It is used in aerospace, national defense technology, surveying and navigation and other fields. widely. In order to ensure the accuracy of the output acceleration of the precision centrifuge, in addition to ensuring the ultra-precision development of the electric drive, r...

AI Technical Summary

Problems solved by technology

At present, scholars at home and abroad have established a number of mathematical models for the output acceleration of precision centrifuges: Considering factors such as the verticality of the main shaft of the precision centrifuge, the misalignment angle, and the dynamic elongation of the radius, a mathematical model of acceleration including dozens of measurement components has been established. model; the acceleration mathematical model established has few measurement components, but it does not clearly indicate whether factors such as celestial force need to be considered, so it is only applicable to precision centrifuges with general precision; while the acceleration mathematical model established by NASA is detailed, but It is mainly used for the analysis of influencing factors. The components in the model are not completely measurable, so it is impossible to directly provide constant acceleration input values ​​for inertial instrument calibration.

From the current research on centrifuges, it can be seen that the measurement components of these acceleration mathematical models established by researchers for centrifuges are either uncertain or unmeasurable, and most of them are suitable for precision centrifuges with general precision levels. There are certain limitations

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