Discretization method for shortening delay generated when reaction wheel is connected into semi-physical system

Abstract

The invention relates to a discretization method for shortening delay generated when a reaction wheel is connected into a semi-physical system. The discretization method comprises the steps that 1, the rotating speed pulse numbers and turning signals of the reaction wheel are collected by a ground dynamic simulation computer; 2, threshold value judgment is conducted on a difference value of the rotating speed pulse numbers in the adjacent sampling periods, the turning signals are filtered, and the rotating speed pulse number and the turning signal in the current sampling period are obtained; 3, the current rotating speed of the reaction wheel is calculated; 4, differential processing is conducted on the rotating speeds in the adjacent sampling periods, and the current control moment output by the reaction wheel is calculated; 5, amplitude limiting processing is conducted on the output control moment; 6, the output control moment and the rotating speed are input to a satellite dynamic model to achieve closed-loop control over the ground satellite attitude control system. According to the discretization method, system delay can be shortened, the influences on the phase stabilization margin of the system are reduced, the test precision of the satellite attitude control system is improved, and high stability and rapid maneuvering capacity of ground satellite attitude controlling are achieved.

Description

technical field [0001] The invention relates to a discretization method, specifically a discretization method capable of reducing the delay caused when a reaction flywheel is connected to a semi-physical system, and belongs to the technical field of satellite simulation testing. Background technique [0002] With the continuous development of satellite technology, it is required to have the functions of fast multi-target acquisition, reorientation and tracking. In terms of system scheme, to meet the requirements of rapid attitude maneuvering, the system needs to increase the control bandwidth, so that the corresponding phase stability margin is reduced accordingly. Generally, in the design of the system scheme, a certain margin of phase stability will be left to meet the engineering indicators and ensure the stability of the system. During the semi-physical simulation test verification, because the reaction flywheel and other actuators enter the dynamics through the ground ...

AI Technical Summary

Problems solved by technology

Differential processing causes the system to bring the influence of time lag, and the phase stability margin of the system will be eroded by the phase reduction caused by the delay. In severe cases, the system will appear unstable in the semi-physical test

And differential processing may amplify the control torque of the actuator, which cannot truly simulate the torque characteristics of a stand-alone machine

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