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Three-dimensional neural network tracking control of a moving target by underactuated autonomous underwater vehicles

  • Khoshnam Shojaei
Original Article
  • 97 Downloads

Abstract

This paper investigates three-dimensional target tracking control problem of underactuated autonomous underwater vehicles (AUVs) by using coordinates transformation and multi-layer neural networks. The passive-boundedness assumption of sway and heave velocities of underactuated AUVs is used to design a controller in the actuated directions. For this purpose, a new Euler–Lagrange formulation is proposed based on range and bearing tracking errors with respect to a moving target in the body-fixed frame. Then, a tracking controller is proposed to make range and bearing tracking errors converge to zero. Multi-layer neural networks (MLNNs) are utilized to approximate unknown nonlinear-in-parameter dynamics of the system, and adaptive robust control techniques are adopted to compensate for MLNN approximation errors and time-varying environmental disturbances which are induced by waves, wind and ocean currents. The stability of the proposed control system is analysed based on Lyapunov’s approach which shows that target tracking errors are semi-globally uniformly ultimately bounded and exponentially tend to a small neighbourhood around the zero. At the end, simulation examples are given to demonstrate the competency of the proposed target tracking controller.

Keywords

Autonomous underwater vehicles Multi-layer neural networks NLIP uncertainty Target tracking Three-dimensional control Underactuated systems 

Notes

Acknowledgements

The author would like to thank anonymous reviewers and associated editor for their helpful suggestions and comments. This work is supported in part by research and technology programme funded by Najafabad branch, Islamic Azad University, under Grant Number 51504920613004 under the research work entitled “Designing tracking controllers for the navigation of autonomous ocean vessels with limited information”.

Compliance with ethical standards

Conflict of interest

The author declares that there is no conflict of interest for this paper.

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Copyright information

© The Natural Computing Applications Forum 2017

Authors and Affiliations

  1. 1.Department of Electrical Engineering, Najafabad BranchIslamic Azad UniversityNajafabadIran

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