Certifiable L1 Adaptive Control for Helicopters (English shop)

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Often, very complex controller techniques are applied to helicopters for generating an intuitively controllable and stable behavior of the aircraft. In legacy controllers, a number of iterations of system identification and loop shaping methods in frequency domain have to be conducted. In this book, a robust adaptive control theory is introduced, with the often underestimated fact of only limited available bandwidths in mind. To this end, the high-frequency adapting L1-adaptive controller is adjusted, a new adaptive law for output feedback is introduced, a new strategy for defining the design of a state feedback controller is proposed, and effects of uncertainties in the processor clock rate and of sensor noise are evaluated for taking the safety critical nature of the system into account. While legacy approaches can be automated by nonlinear optimization techniques and yet cannot eliminate the necessity of repeated flight tests, the L1-adaptive controller is particularly suitable to reduce development time, provided a sufficiently deep understanding of the system is available. Rigorous mathematical proofs substantiate the stability and robustness of the algorithms as shown, while performance and handling qualities are verified in a research simulator.

Rezension

Aerospace systems are among the most demanding applications for adaptive control. Especially helicopters are well known for a myriad of unique and varying effects, making it challenging to control with pure a priori knowledge. The book provides an insightful combination of physical understanding and mathematical research in the L1-adaptive control theory. We see in this book how L1-adaptive control supports a strong adherence to safety principles – moreover, pilots may like its predictable performance. (Prof. Naira Hovakimyan)