Stability limit of human-in-the-loop model reference adaptive control architectures

Yücelen, T.Yıldız, YıldıraySipahi, R.Yousefi, EhsanNguyen, N.2018-04-122018-04-1220180020-7179http://hdl.handle.net/11693/36469Model reference adaptive control (MRAC) offers mathematical and design tools to effectively cope with many challenges of real-world control problems such as exogenous disturbances, system uncertainties and degraded modes of operations. On the other hand, when faced with human-in-the-loop settings, these controllers can lead to unstable system trajectories in certain applications. To establish an understanding of stability limitations of MRAC architectures in the presence of humans, here a mathematical framework is developed whereby an MRAC is designed in conjunction with a class of linear human models including human reaction delays. This framework is then used to reveal, through stability analysis tools, the stability limit of the MRAC–human closed-loop system and the range of model parameters respecting this limit. An illustrative numerical example of an adaptive flight control application with a Neal–Smith pilot model is presented to demonstrate the effectiveness of developed approaches. © 2017 Informa UK Limited, trading as Taylor & Francis GroupEnglishClosed - loop system stabilityHuman reaction time delayHuman - in - the - loop systemsModel reference adaptive controlUncertain dynamical systemsStability limit of human-in-the-loop model reference adaptive control architecturesArticle10.1080/00207179.2017.13422741366-5820