| As the structure of modern systems such as aerospace and intelligent equipment becomes more and more complex,the possibility of failure of various parts of the system is also higher.Minor failures may cause the system performance to decline,or even become unstable,thereby causing serious Production accidents and huge economic losses.Therefore,in order to ensure the safety and stability of modern systems,the research on system fault-tolerant control has received more and more attention.As a kind of complex spacecraft system,flexible spacecraft has a very important practical value for simplifying its model and simplifying fault-tolerant control methods for complex system structures and models.This paper first aims at the flexible spacecraft model and considers the failures of its rigid and flexible parts,and establishes a model of the two-part coupled interconnected system.The interconnected system method is used to study the fault-tolerant control of the flexible spacecraft.Each sub-part is designed Distributed and decentralized fault-tolerant control methods,and the overall stability of the system is analyzed through the principle of small gain.This article first introduces the background and research significance of the subject,and systematically summarizes the research status of Fault Tolerant Control(FTC)and FTC of flexible spacecraft.This article mainly studies the related content of fault-tolerant control of flexible spacecraft through the interconnected system method,and has obtained certain research results,which mainly include:(1)Establish a model of the interconnected system of a flexible spacecraft under fault conditions.For the flexible spacecraft model,consider it as an interconnected system where the rigid body part and the flexible part are coupled,consider the possible failures of each sub-section,and then select the relevant state quantities and output quantities to establish the flexible spacecraft under fault conditions Interconnected system model.(2)Distributed fault-tolerant control method.Aiming at the interconnected system model of the flexible spacecraft under fault conditions,the distributed observers and fault-tolerant controllers of each sub-section are designed respectively,the factors affecting the stability of each sub-section are analyzed,and then the stability of the overall system is analyzed by the small gain principle.At the same time,the validity of the conclusions is verified by simulation.(3)Decentralized fault-tolerant control method.Based on the flexible spacecraft interconnected system model,a decentralized observer and a fault-tolerant controller are designed,and the stability status of each sub-section is analyzed.Then the small gain principle is used to obtain the conditions to ensure the stability of the entire system.Finally,the effectiveness of the decentralized control method is verified by numerical simulation,and the two methods described above and the traditional centralized method are compared by simulation. |
