Neural Network Based Diagnostics of Actuator for an Attitude Control System

SALOMON Montenegro,HU Wei-duo (School of Astronautics,Beijing University of Aeronautics and Astronautics,Beijing 100191,China)  

The objective of this paper is to develop a neural network-based residual generator to detect the fault in the actuators for a specific communication satellite in its attitude control system (ACS). First,a dynamic multilayer perceptron network with dynamic neurons is used,these neurons correspond to a second order linear Infinite Impulse Response (IIR) filter and a nonlinear activation function with adjustable parameters. Second,the parameters from the network are adjusted to minimize a performance index specified by the output estimated error,with the given input-output data collected from the specific ACS. Then,the proposed dynamic neural network is trained and applied for detecting the faults injected to the wheel,which is the main actuator in the normal mode for the communication satellite. Then the performance and capabilities of the proposed network were tested and compared with a conventional model-based observer residual,showing the differences between these two methods,and indicating the benefit of the proposed algorithm to know the real status of the momentum wheel. Finally,the application of the methods in a satellite ground station is discussed.

【Key Words】： satellite attitude control momentum wheel neural network fault detection
【CateGory Index】： V467

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