A fault-tolerant control method for flexible spacecraft based on interconnected system method

Abstract

The invention discloses a fault-tolerant control method for a flexible spacecraft based on an interconnected system method. By establishing an attitude dynamic model of the flexible spacecraft under the condition of a fault, the method can consider the entire flexible spacecraft as a flexible An interconnected system coupled with a part and a rigid part, using distributed and decentralized methods to design fault-tolerant control schemes for each sub-part, so that each sub-part can achieve the condition of input to state stability, and then use the principle of small gain to ensure the stability of the entire system closed-loop stability. The present invention not only considers the faults existing on the rigid body part, but also performs fault-tolerant control on the faults of the flexible body part. At the same time, the observer and controller are separately designed for each part by using the interconnection system method, which simplifies the structure of the observer and the controller, and makes the It is easier to implement in engineering.

Description

technical field [0001] The invention relates to a flexible spacecraft fault-tolerant control method based on an interconnected system method, and belongs to the technical field of spacecraft fault-tolerant control. Background technique [0002] As a type of large-scale complex structural system, spacecraft will inevitably fail due to its long-term work in a special environment of vacuum, weightlessness, and high radiation. Particularity, its faults can often cause huge losses, and the repair of faults is often more complicated and difficult to complete than other systems. Therefore, the fault-tolerant control of spacecraft has aroused great interest because of its important engineering and academic value, and many spacecraft attitude control methods and technologies have been proposed one after another. Compared with traditional spacecraft, flexible spacecraft can often complete many special space tasks due to the flexible parts it carries, and at the same time, its require...

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Problems solved by technology

[0003] For flexible spacecraft, failures will not only occur on the rigid body, but also on flexible parts, and the failure of the flexible part often affects its ability to undertake special tasks, and even affects the normal operation of the flexible spacecraft as a whole. run

At present, most of the research on the fault tolerance of flexible spacecraft is aimed at the faults of the rigid body part. As for the research on the faults of the flexible body part, according to the situation we have checked so far, most of the literature is aimed at the design of the entire flexible spacecraft system. The fault-tolerant control scheme, due to the complex structure of the flexible spacecraft, the corresponding observer and controller are also very complex, and it is difficult to realize in industry

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