Modares Mechanical Engineering

Modares Mechanical Engineering

Design of Constrained Predictive Controller for Autonomous Underwater Vehicle and Optimization of Computation Time in the Presence of Disturbances

Authors
Ayoub Khodaparast 1
Ali Jabar Rashidi 2
Bahram Karimi 2
1 Center of Mechatronics Science and Technology, Department of Electrical and computer Engineering , Malek-Ashtar University of Technology, Isfahan, Iran
2 Department of Electrical and Computer Engineering, Malek-Ashtar University of Technology, Tehran, Iran
Abstract
In this paper, a constrained predictive controller is designed using Laguerre functions to control the depth and steering of an autonomous underwater vehicle considering underwater disturbances. Due to under-actuated nonlinear coupled dynamics, parameters uncertainty, external underwater disturbances autonomous underwater vehicles are complicated. Moreover, the underwater autonomous vehicle investigated in this study includes constraints on actuators leading a more complex problem. In this study, first, the nonlinear dynamics of the autonomous underwater vehicle utilized for the controller design has been modeled. Then, Laguerre orthogonal functions were used in the constrained predictive controller design for reducing computational time and accelerating optimization process. Optimized, online, high precision, implementation capability, consider constraints purposefully and robust properties against disturbances can be mentioned as the most important advantages of designed controller. In addition, predictive control method is robust against disturbances. To monitor the methods’ performance, the autonomous underwater vehicle was modeled and then a comparison between the controller's calculation time with and without the Laguerre functions was also represented. At the end, the simulation results obtained from this controller, using Laguerre functions, showed the efficiency and effectiveness of the proposed solution.
Keywords
Autonomous Underwater Vehicle
Predictive controller
Reduce Computational Time
Laguerre functions

Subjects

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Modares Mechanical Engineering
Volume 18, Issue 8
December 2018
Pages 151-162