Journal
OCEAN ENGINEERING
Volume 123, Issue -, Pages 45-54Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.oceaneng.2016.06.041
Keywords
AUV; Adaptive sliding mode control; Anti-Windup; Dynamic compensator; Input nonlinearity
Funding
- National Natural Science Foundation of China (NSFC) [61472325, 51209174, 51311130137]
- Natural Science Basic Research Plan in Shaanxi Province of China [2015JM5254]
- Fundamental Research Funds for Central Universities [3102015BJ014]
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In this paper, we consider attitude control for autonomous underwater vehicles (AUVs) with input nonlinearities and unknown disturbances taken into account. The dynamics model in the 3D space of an AUV is simplified to a second-order dynamics with unknown model parameters and disturbances for the yaw and pitch control. Based on this simplification, a sliding-mode-based adaptive control is proposed for the case without any input nonlinearities. For the dead-zone nonlinearity and unknown disturbances, a sliding-mode-based adaptive control combined with a nonlinear disturbance observer is employed, in which the non-symmetric dead-zone with unknown parameters is modeled as a time-varying disturbance-like term rather than constructing a smooth dead-zone inverse. For rudder saturation, the control is further designed by introducing an auxiliary dynamic compensator. The mathematical proof of the proposed algorithms is presented. Extensive simulation results are presented to illustrate the effectiveness of the proposed control. In addition, experimental results on an AUV whose attitude is controlled by cross-type rudders are also provided to show the effectiveness of the proposed algorithms. (C) 2016 Elsevier Ltd. All rights reserved.
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