Method for measuring torque under low rotation speed and poor information condition of momentum wheel

A technology of torque measurement and rotational speed measurement, applied in the field of momentum wheel torque measurement

Active Publication Date: 2014-09-24
BEIJING INST OF CONTROL ENG
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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 informati

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  • Method for measuring torque under low rotation speed and poor information condition of momentum wheel
  • Method for measuring torque under low rotation speed and poor information condition of momentum wheel
  • Method for measuring torque under low rotation speed and poor information condition of momentum wheel

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Embodiment Construction

[0053] Before describing the present invention in detail, the terms in the present invention will be explained in detail:

[0054] The average relative modeling error refers to the arithmetic average of the relative modeling error at each moment (that is, the deviation between the output value of the prediction model and the actual measurement value divided by the actual measurement value). The mathematical definition (also the calculation formula) is shown in formula (8).

[0055] Metabolic discrete gray prediction model refers to a discrete gray prediction model established by inserting a newest input information, removing one of the oldest input information, keeping the input information in the middle, and taking the information sequence as the input. Among them, the discrete gray prediction model refers to the form or The gray model for prediction.

[0056] The present invention will be described in detail below in conjunction with the drawings:

[0057] Taking the 50Nms reacti...

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Abstract

A method for measuring torque under the low rotation speed and poor information condition of a momentum wheel comprises the steps that according to historical momentum wheel rotation speed measurement information and current momentum wheel rotation speed measurement information, a rotation speed value at the next moment is predicted through a metabolism-type dispersion grey prediction model; based on the difference between the predicted rotation speed value and a corrected current measurement value, a torque measurement value at the current moment is worked out; before calculation of the metabolism-type dispersed grey prediction model is conducted, the modeling data length is automatically adjusted through the rotation speed mean square error and the average relative modeling error. The shortage that original rotation speed information is directly used for difference derivation is overcome, the difficulty that a momentum wheel control voltage or current information is additionally introduced is avoided, the accuracy and the instantaneity of torque measurement can be effectively improved, and the method is particularly suitable for momentum wheel torque measurement under the low rotation speed and poor information condition.

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 the measurement of the momentum wheel torque during the ground test of a spacecraft control system, and can also be applied to other similar rotating mechanisms where low rotational speed measurement is required. . Background technique [0002] Momentum wheel is one of the most commonly used actuators on spacecraft, and it is an important part of achieving closed-loop control of spacecraft attitude. 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 spacecraft attitude rotation angle control is realized. Its essence is the interaction between the momentum wheel and the spacecraft body. In the ground test of the spacecraft control system, it is necessary ...

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Application Information

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IPC IPC(8): G01L5/00
Inventor 王佐伟杨帆蔡君亮刘江吴小明
Owner BEIJING INST OF CONTROL ENG
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