Redundant flywheel set angular momentum self-management method

An autonomous management, angular momentum technology, applied in the field of angular momentum management, can solve the problems of fuel consumption and frequent unloading, and achieve the effect of reducing frequency and improving absorption

Active Publication Date: 2013-09-04
BEIJING INST OF CONTROL ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] (1) The setting of the nominal value, the speed distribution and control of each working flywheel during unloading, did not follow the optimization direction of the adjustable angular momentum capacity of the flywheel set to unload, so after unloading, the flywheel set can absorb external disturbances and accumulate less angular momentum , frequent unloading under the action of large external disturbance t

Method used

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  • Redundant flywheel set angular momentum self-management method
  • Redundant flywheel set angular momentum self-management method
  • Redundant flywheel set angular momentum self-management method

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Embodiment

[0074] For a satellite equipped with 6 flywheels, the initial working wheel set is 4 or 5 flywheels, use formula (2) to set the initial angular momentum, and then use formula (4) to calculate the zero motion control torque so that the working wheel set angular momentum and h( t) consistent, when the flywheel fails, reconfigure to obtain the reconfigured working flywheel, call the formula (2) to set the target angular momentum of the flywheel group, and then use the formula (4) to calculate the zero motion control torque to make the new configuration work The angular momentum of the wheel set is consistent with h(t). The simulation time of each group is 100000s. The simulation figure shows the measured rotational speed of the flywheel in rpm, which is multiplied by 0.0108696 to get the angular momentum. Depend on Figure 2 to Figure 9 It can be seen that in the case of a large external disturbance torque, the unloading is performed once a day, and the flywheel rotation speed i...

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Abstract

The invention discloses a redundant flywheel set angular momentum self-management method. The method includes the steps of setting an unloading period T through periodic rules of three-shaft stable satellite external disturbance torque, estimating angular momentum HI(T) accumulated by the external disturbance torque in the unloading period, setting a composite angular momentum initial value H0 according to the HI(T), determining a working wheel set angular momentum target value h(t) and target angular momentum hZ of working wheel set zero movement space according to an initial working wheel set or a working wheel set where failure processing and reconstitution are conducted, determining working wheel set unloading target angular momentum h(0) according to hZ and H0, controlling the working wheel set angular momentum to be the unloading target angular momentum h(0) by controlling air injection and the wheel rotating speed at the unloading moment, and controlling the working wheel set angular momentum to be the working wheel set angular momentum target value h(t) according to a zero movement control law at the non-unloading moment. According to the redundant flywheel set angular momentum self-management method, unloading can be conducted in the optimized direction with the largest flywheel set angular momentum capacity, fuel is saved, and no air injection control is needed when a flywheel set is reconfigured in the non-unloading period.

Description

technical field [0001] The invention relates to a method for managing the angular momentum of a three-axis stable earth observation satellite controlled by a flywheel, in particular to a method for autonomously managing the angular momentum of a redundant flywheel set using jet unloading, and the redundant flywheel set includes more than four flywheels. Background technique [0002] When modern long-life three-axis attitude-stabilized satellites work in normal mode, redundant flywheel sets are generally used as the actuators of the attitude control system to implement continuous and stable control of the satellite attitude. In order to overcome the influence of the external environment disturbance torque on the satellite attitude, the attitude control system uses the principle of angular momentum exchange, and the flywheel group absorbs the angular momentum generated and accumulated by the external disturbance torque. If there is no unloading measure, the accumulation of exte...

Claims

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Application Information

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IPC IPC(8): B64G1/24
Inventor 刘一武陈守磊汤亮朱莲枝于嘉茹严欣颖刘端郭廷荣胡少春
Owner BEIJING INST OF CONTROL ENG
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