Momentum wheel friction torque in-orbit real-time estimating method
A friction torque and momentum wheel technology, applied in the field of estimation, can solve problems such as no estimation and monitoring, time-varying friction torque, and difficulty in accurate measurement of momentum wheel friction torque. The process is simple and easy to achieve, and the accuracy of estimation is guaranteed. simple effect
Active Publication Date: 2018-01-12
SHANGHAI SATELLITE ENG INST
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Problems solved by technology
But it is very difficult to accurately measure the friction torque of the momentum wheel, and the friction torque is time-varying
Some momentum wheels work in the speed mode, and the speed closed-loop feedback is used to suppress the problem of inaccurate measurement of the speed of the momentum wheel at low speed or zero crossing. The friction torque is not estimated and monitored, and only the momentum wheel motor current telemetry is used to respond to the momentum wheel. On-orbit bearing friction torque, but when the satellite attitude maneuvers or the speed of the momentum wheel changes rapidly, the motor current telemetry cannot fully reflect the friction torque of the momentum wheel
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[0024] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.
[0025] Such as figure 1 As shown, the on-orbit real-time estimation method of momentum wheel friction torque of the present invention comprises the following steps:
[0026] Step 1, Acquisition and conversion of momentum wheel parameters;
[0027] Step 2: Selection of integration time parameters. The integration time parameters include the iteration step size of the integration process, the integration time length, and the iteration step size T 3 Indicates the time interval between two integral ...
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The invention provides a momentum wheel friction torque in-orbit real-time estimating method. The method includes the following steps of firstly, collecting and converting momentum wheel parameters; secondly, selecting integral time parameters; thirdly, summating integrals; fourthly, calculating the friction torque. By means of momentum wheel in-orbit real-time rotating speed and momentum wheel drive control voltage torque real-time measurement data, the friction torque in the momentum wheel rotating process can be rapidly estimated, and the precise control over the momentum wheel output torque and the monitoring of the bearing friction torque in-orbit health state are realized.
Description
technical field [0001] The invention relates to an estimation method, in particular to an on-orbit real-time estimation method of momentum wheel friction torque. Background technique [0002] As a momentum exchange and momentum storage device, the momentum wheel can maintain and control the attitude of the spacecraft by changing its own angular momentum, and it is a widely used actuator in the attitude control system of the spacecraft. [0003] Due to the existence of frictional torque during the rotation of the momentum wheel, the torque output of the momentum wheel is not the theoretical command torque, which causes an error in the output of the flywheel torque and interferes with the satellite attitude control system. Especially when the momentum wheel is installed orthogonally, the momentum wheel generally works at a lower speed, and it will frequently pass through zero speed and change between positive and negative speed parts. The friction torque of the momentum wheel...
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Inventor 边志强栗双岭董瑶海许海玉沈毅力金历群许娜
Owner SHANGHAI SATELLITE ENG INST