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Proportional integral derivative controller assisted reinforcement learning for path following by autonomous underwater vehicles

2020-09-22 23:25:47
Simen Theie Havenstrøm, Camilla Sterud, Adil Rasheed, Omer San

Abstract

Control theory provides engineers with a multitude of tools to design controllers that manipulate the closed-loop behavior and stability of dynamical systems. These methods rely heavily on insights about the mathematical model governing the physical system. However, if a system is highly complex, it might be infeasible to produce a reliable mathematical model of the system. Without a model most of the theoretical tools to develop control laws break down. In these settings, machine learning controllers become attractive: Controllers that can learn and adapt to complex systems, developing control laws where the engineer cannot. This article focuses on utilizing machine learning controllers in practical applications, specifically using deep reinforcement learning in motion control systems for an autonomous underwater vehicle with six degrees-of-freedom. Two methods are considered: end-to-end learning, where the vehicle is left entirely alone to explore the solution space in its search for an optimal policy, and PID assisted learning, where the DRL controller is essentially split into three separate parts, each controlling its own actuator.

Abstract (translated)

URL

https://arxiv.org/abs/2002.01022

PDF

https://arxiv.org/pdf/2002.01022.pdf


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