A self-healing control method for composite faults of hypersonic vehicle sensors

Abstract

The invention discloses a hypersonic vehicle sensor compound fault self-healing control method. The steps are: aiming at the hypersonic vehicle re-entry section attitude angle nonlinear system, establishing a hypersonic vehicle re-entry section attitude model with sensor composite faults; The attitude model of the re-entry section of the hypersonic vehicle is established, and the sensor nonlinear fault detection observer and detection threshold are designed to detect sensor faults; the outer loop self-adaptive sliding mode virtual fault-tolerant controller is designed, and according to the fault detection results, it is determined whether to The fault compensation item is added to obtain the virtual control input signal transmitted to the inner loop; according to the obtained control input signal, the dynamic surface controller of the inner loop is designed to obtain the required control torque and make the system stably track the given reference command. This method can solve the problem of fault detection and self-healing control when the attitude angle system of the hypersonic vehicle is subjected to external interference and complex sensor faults.

Description

technical field [0001] The invention belongs to the technical field of hypersonic vehicle sensor composite fault fault-tolerant control, and in particular relates to a self-healing control method for hypersonic vehicle sensor composite faults. Background technique [0002] In recent years, due to the many advantages of hypersonic vehicles in military and civilian aspects such as launch cost, flight speed, space transportation and global strike, they have attracted much attention. Compared with traditional aerospace vehicles, hypersonic vehicles have dynamic characteristics such as strong nonlinearity, strong coupling and fast time-varying. The conditions of atmospheric density, temperature and airflow environment in near space are more complex and harsh than the flight environment of ordinary aircraft. The sensor system is easily affected by freezing, high temperature and lightning, causing failures, deviations in measured values, and even errors in the overall measurement o...

AI Technical Summary

Problems solved by technology

However, for nonlinear systems, the difficulty of designing observers is greatly increased, especially for highly coupled complex nonlinear systems such as hypersonic vehicle re-entry section attitude angle systems.

In addition, additional fault estimation observers will increase the complexity and instability of the system, especially when dealing with compound faults, the increase in the number of faults and the degree of coupling often requires more, higher-dimensional and more complex observers, Bring greater challenges to system stability assurance and method design

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