International Journal of Control, Automation, and Systems

Institute of Control, Robotics and Systems (제어로봇시스템학회)
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A Neural Network Adaptive Controller for Autonomous Diving Control of an Autonomous Underwater Vehicle

  • Li, Ji-Hong (Development System Lab. of the Korea Research Institute of Ships ＆ Ocean Engineering) ;
  • Lee, Pan-Mook (Development System Lab. of the Korea Research Institute of Ships ＆ Ocean Engineerin) ;
  • Jun, Bong-Huan (Development System Lab. of the Korea Research Institute of Ships ＆ Ocean Engineering)
  • Published : 2004.09.01
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Abstract

This paper presents a neural network adaptive controller for autonomous diving control of an autonomous underwater vehicle (AUV) using adaptive backstepping method. In general, the dynamics of underwater robotics vehicles (URVs) are highly nonlinear and the hydrodynamic coefficients of vehicles are difficult to be accurately determined a priori because of variations of these coefficients with different operating conditions. In this paper, the smooth unknown dynamics of a vehicle is approximated by a neural network, and the remaining unstructured uncertainties, such as disturbances and unmodeled dynamics, are assumed to be unbounded, although they still satisfy certain growth conditions characterized by 'bounding functions' composed of known functions multiplied by unknown constants. Under certain relaxed assumptions pertaining to the control gain functions, the proposed control scheme can guarantee that all the signals in the closed-loop system satisfy to be uniformly ultimately bounded (UUB). Simulation studies are included to illustrate the effectiveness of the proposed control scheme, and some practical features of the control laws are also discussed.

Keywords

References

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