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Method for detecting early abnormalities of momentum wheel of satellite based on Shewhart control charts

A satellite momentum wheel and anomaly detection technology, which is used in motor vehicles, space navigation equipment, space navigation aircraft, etc., can solve the problems of large amount of calculation, poor accuracy, low efficiency, etc. Efficient effect

Active Publication Date: 2015-12-30
HARBIN INST OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to solve the disadvantages of being unable to detect early anomalies based on the traditional threshold value, poor accuracy, large amount of calculation, and low efficiency, without considering historical data, and the detection results are affected by environmental fluctuations and system noise. An Early Anomaly Detection Method for Satellite Momentum Wheel Based on Shewhart Control Chart

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  • Method for detecting early abnormalities of momentum wheel of satellite based on Shewhart control charts
  • Method for detecting early abnormalities of momentum wheel of satellite based on Shewhart control charts
  • Method for detecting early abnormalities of momentum wheel of satellite based on Shewhart control charts

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specific Embodiment approach 1

[0032] Specific implementation mode one: combine figure 1 An early anomaly detection method for satellite momentum wheels based on the Shewhart control chart of this embodiment is specifically prepared according to the following steps:

[0033] Step 1. Input the historical data of the satellite momentum wheel, select the interval with stable speed in the historical data, that is, the steady-state segment, and calculate the ratio of the current average value of the satellite momentum wheel in the steady-state segment to the average speed value of the satellite momentum wheel, that is, the satellite momentum wheel stability The current rotation speed ratio in the state process; wherein, the satellite historical data includes the current data of the satellite momentum wheel and the rotation speed data of the satellite momentum wheel;

[0034] Step 2, calculating the statistical characteristics of the current speed ratio in the steady-state process of the satellite momentum wheel;...

specific Embodiment approach 2

[0054] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the ratio of the current mean value of the satellite momentum wheel in the steady state segment to the average value of the rotational speed of the satellite momentum wheel in step 1 is the current in the steady state process of the satellite momentum wheel The speed ratio is specifically:

[0055] (1) Select the current speed ratio in the steady state process of the momentum wheel as a characteristic parameter of satellite anomaly detection. When it is abnormal, the constant value K will change, and since the ratio of the constant current to speed is a constant value, the ratio of the mean value of the current to the mean value of the speed in the stable stage is also the constant value; take the transition to the steady state as the premise criterion to select respectively m sets of current values, i jk and m group speed value w jk ;

[0056] Among them, j represents the...

specific Embodiment approach 3

[0058] Specific implementation mode three: the difference between this implementation mode and specific implementation mode one or two is that: in step two, the variance of the statistical characteristics of the current speed ratio during the steady-state process of the satellite momentum wheel is calculated as follows:

[0059] (1) Considering the influence of the satellite momentum wheel due to slight changes in the working environment, the state fluctuation of the momentum wheel system itself, and the random error of the measurement, calculate the mean value X of the statistical characteristics of the current speed ratio in the steady state process of the satellite momentum wheel 0 The calculation formula is X 0 = Σ j = 1 m K j / m ;

[0060] (2) Calculate the varian...

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Abstract

The invention discloses a method for detecting early abnormalities of a momentum wheel of a satellite based on Shewhart control charts, which relates to a method for detecting early abnormalities of a momentum wheel of a satellite. The invention aims to solve the problems of poor accuracy, large calculated amount, low efficiency, and fluctuation influence on detection results because early abnormalities can not be detected out. The method disclosed by the invention is implemented through the following steps: 1, calculating an electric current-rotating speed ratio of the momentum wheel of the satellite in the steady-state process; 2, evaluating a statistical property of the electric current-rotating speed ratio of the momentum wheel of the satellite in the steady-state process; 3, determining threshold values of a Shewhart single-value control chart and a moving range control chart; 4, selecting an electric current value and rotating speed value of the satellite in a steady-state section; 5, taking Xi as a controlled point; 6, drawing Xi in the Shewhart single-value control chart; 7, judging whether the fluctuation of the electric current-rotating speed ratio is normal; and 8, judging whether the working state of the momentum wheel of the satellite is normal, and the like. The method disclosed by the invention is applied to the field of detection on early abnormalities of momentum wheels of satellites.

Description

technical field [0001] The invention relates to an early anomaly detection method for a satellite momentum wheel, in particular to an early anomaly detection method for a satellite momentum wheel based on a Shewhart control chart. Background technique [0002] The satellite momentum wheel is the core component of satellite attitude control. If the satellite is subjected to an external force torque to maintain the angular momentum of the satellite body, the change in the angular momentum of the momentum wheel must be offset by the impulse of the external torque. If the momentum wheel fails, it will The attitude of the satellite itself is out of control. [0003] The current satellite momentum wheel anomaly detection has the following shortcomings: [0004] First, the anomaly detection of the current satellite momentum wheel is to check whether each data monitored by the satellite exceeds its set threshold value. This threshold value is generally set relatively wide, and only...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B64G1/66
Inventor 李玉庆肈刚王日新高波程瑶王徐华张海龙徐敏强
Owner HARBIN INST OF TECH
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