Unknown input observer based satellite actuating mechanism fault diagnosis method

Abstract

The invention discloses an unknown input observer based satellite actuating mechanism fault diagnosis method which can realize fault isolation of momentum wheels in different channels without directly measuring relevant physic quantities of an actuating mechanism. The method comprises the basic procedures of: firstly, establishing an analytical model used for describing an input and output relationship between the actuating mechanism and an inertia sensor and selecting an actuating mechanism fault isolation strategy; then regarding a fault of a non-target actuating mechanism as an unknown input based on requirements of a structural residual error design, designing an unknown input observer to obtain a residual error for fault decoupling of the non-target actuating mechanism, selecting a bound norm of the residual error as a residual error evaluation value, obtaining a corresponding threshold based on an interval analysis method, further determining whether a fault of the target actuating mechanism occurs in the system and finishing the fault decision of the residual error; finally, synthesizing the fault decision result of each residual error, and determining the specific position of the fault of the actuating mechanism of the system by using a fault separation strategy.

Description

technical field [0001] The invention belongs to the field of satellite attitude control and relates to a fault diagnosis method of an actuator based on an unknown input observer. Background technique [0002] Most modern spacecraft have complex structures, harsh working environments, long operating hours, and are prone to failures during on-orbit work. Once a failure occurs, if active and effective measures are not taken to deal with it, it is likely to lead to the failure of space missions, resulting in huge waste of resources and adverse social impact. [0003] As the most critical and complex subsystem among the various subsystems that make up the satellite, the reliability of the satellite attitude control system is the basic guarantee for the normal operation of multiple subsystems on the satellite. For example, the telemetry and remote control subsystem requires the antenna to point to the correct position in order to realize communication with the ground station; the...

AI Technical Summary

Problems solved by technology

Generally, the consistency test method is used to diagnose the faults of the actuators of the satellite attitude control system. , it is not suitable to use this method for fault diagnosis

In order to solve the fault diagnosis problem of the actuator of the satellite attitude control system under the condition that the relevant quantities required for the consistency check of the actuator are not easy to measure, the present invention proposes a fault isolation method for the actuator of the satellite control system based on an unknown input observer

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