“Adaptive control of nonlinear underwater robotic systems”

Authors: Thor I. Fossen and Svein I. Sagatun,
Affiliation: NTNU, Department of Engineering Cybernetics
Reference: 1991, Vol 12, No 2, pp. 95-105.

Keywords: AUV, ROV, adaptive control, input uncertainty

Abstract: The problem of controlling underwater mobile robots in 6 degrees of freedom (DOF) is addressed. Uncertainties in the input matrix due to partly known nonlinear thruster characteristics are modeled as multiplicative input uncertainty. This paper proposes two methods to compensate for the model uncertainties: (1) an adaptive passivity-based control scheme and (2) deriving a hybrid (adaptive and sliding) controller. The hybrid controller consists of a switching term which compensates for uncertainties in the input matrix and an on-line parameter estimation algorithm. Global stability is ensured by applying Barbalat´s Lyapunovlike lemma. The hybrid controller is simulated for the horizontal motion of the Norwegian Experimental Remotely Operated Vehicle (NEROV).

PDF PDF (1132 Kb)        DOI: 10.4173/mic.1991.2.4

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  title={{Adaptive control of nonlinear underwater robotic systems}},
  author={Fossen, Thor I. and Sagatun, Svein I.},
  journal={Modeling, Identification and Control},
  publisher={Norwegian Society of Automatic Control}