Model-Based Direct Adaptive Actuator Failure Compensation Techniques for Aircraft Flight Control

Actuator failures can cause system performance deterioration or even fatal disasters if not effectively accommodated. Effective failure compensation is particularly important for safety-critical systems such as flight control systems and space exploration systems, especially when human maintenance may not be available right after the failures occur. Failures can alter system dynamics or result in unreliable feedback, and it may often be difficult to accurately determine the time instant, pattern a magnitude of the failures. It is crucial that control systems can still guarantee safety with satisfactory performances when uncertain failures occur. In this paper, we will present a new framework for actuator failure compensation using a model-based direct adaptive control approach without explicit failure detection and isolation. We will particularly address system redundancy characterization, controller parametrization and performance evaluation for aircraft flight control applications. Adaptive control designs for state and output tracking will be derived. Comparison to other approaches and open problems will be discussed.

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