A torque measurement method under the condition of low speed and poor information of momentum wheel

Abstract

A torque measurement method under the condition of low rotational speed and poor information of the momentum wheel. According to the historical and current momentum wheel rotational speed measurement information, the metabolic discrete gray prediction model is used to predict the rotational speed value at the next moment; based on the rotational speed prediction value and the corrected current The moment measurement value is calculated from the difference of the measured value at the current moment; before the calculation of the metabolic discrete gray prediction model, the length of the modeling data is automatically adjusted by using the mean square error of the speed and the average relative modeling error. The present invention overcomes the disadvantage of directly using the original rotational speed information for differential derivation, and avoids the difficulty of additionally introducing momentum wheel control voltage or current information, while the accuracy and real-time performance of torque measurement can be effectively improved, especially suitable for low rotational speeds Momentum wheel torque measurements under poor information conditions.

Description

technical field [0001] The invention relates to a torque measurement method under the condition of low rotational speed and poor information of the momentum wheel, which is suitable for measuring the torque of the momentum wheel during the ground test of the spacecraft control system, and can also be popularized and applied to occasions requiring low rotational speed measurement of other similar rotating mechanisms . Background technique [0002] Momentum wheel is one of the most commonly used actuators on spacecraft, and it is an important link to realize closed-loop attitude control of spacecraft. The basic principle is that by adjusting the rotational speed of the momentum wheel, the angular momentum exchange between the momentum wheel and the spacecraft body is carried out, and then the attitude and rotation angle control of the spacecraft is realized. Its essence is the mutual torque between the momentum wheel and the spacecraft body. In the ground test of the spacecr...

AI Technical Summary

Problems solved by technology

[0007] The technical problem of the present invention is to overcome the shortcomings of the existing momentum wheel torque measurement method based on speed measurement, and propose a torque measurement method under the condition of low speed and poor information of the momentum wheel, which overcomes the need to directly use the original speed information for differential The disadvantage of derivation avoids the difficulty of additionally introducing momentum wheel control voltage or current information, effectively improves the accuracy and real-time performance of torque measurement, and is especially suitable for momentum wheel torque measurement under the condition of low speed and poor information

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