Abstract
For course control of ships with unknown control coefficient and model parameters, an indirect adaptive robust controller, in which the parameter estimation law and the control law are designed separately, is proposed. This design method can achieve not only excellent course control performance but also accurate parameter estimates for secondary purposes such as assisting in ship maneuvering decision. Firstly, a Nussbaum function is combined with the adaptive dynamic surface control method to design a strong robust controller which can ensure the stability of the closed-loop ship course control system in spite of parameter uncertainties, unknown control coefficient and disturbances. Secondly, the nonlinear model for ship steering is converted into linear form by using the X-swapping technique. And a modified least-squares identification algorithm is then proposed to estimate the unknown model parameters. The global uniform ultimate boundedness of all signals of the resulting closed-loop system is guaranteed via Lyapunov stability theory. Lastly, simulation results are executed to demonstrate the effectiveness of the proposed design method.
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This work was supported partially by the National Natural Science Foundation of China under Grant No. 51979117.
Jinbo Wu received his Ph.D. degree in mechanical electronic engineering from Huazhong University of Science and Technology in 2007. He is currently a professor in Huazhong University of Science and Technology. His research interests include image processing, control of nonlinear systems, and robotics.
Chenghao Zeng received his B.E. degree in marine engineering from Huazhong University of Science and Technology in 2019. He is now pursuing an M.E. degree in marine engineering at Huazhong University of Science and Technology. His current research interests include adaptive robust control and active heave compensation.
Yifei Hu received his B.E. degree in marine engineering from Huazhong University of Science and Technology in 2019. He is now pursuing a Ph.D. degree in marine engineering at Huazhong University of Science and Technology. His current research interests include signal processing and self-adaptive control.
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Wu, J., Zeng, C. & Hu, Y. Indirect Adaptive Robust Control Design for Course Tracking of Ships Subject to Unknown Control Coefficient and Disturbances. Int. J. Control Autom. Syst. 19, 2059–2067 (2021). https://doi.org/10.1007/s12555-020-0052-2
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DOI: https://doi.org/10.1007/s12555-020-0052-2