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Journal of Control Science and Engineering
Volume 2012, Article ID 394791, 7 pages
Research Article

Pilot-Induced Oscillation Suppression by Using 𝐿 1 Adaptive Control

Department of Mechanical Engineering, University of Connecticut, Storrs, CT 06269-3139, USA

Received 12 December 2011; Accepted 24 February 2012

Academic Editor: Lili Ma

Copyright © 2012 Chuan Wang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Despite significant technical advances, pilot-induced oscillation (PIO) continues to occur in both flight tests and operational aircrafts. Such a phenomenon has led to significant research activities that aim to alleviate this problem. In this paper, the L1 adaptive controller has been introduced to suppress the PIO, which is caused by rate limiting and pure time delay. Due to its architecture, the L1 adaptive controller will achieve a desired response with fast adaptation. The analysis of PIO and its suppression by L1 adaptive controller are presented in detail in the paper. The simulation results indicate that the L1 adaptive control is efficient in solving this kind of problem.