no code implementations • 10 Jun 2022 • Hossein Nejatbakhsh Esfahani, Sebastien Gros
In this paper, we propose a learning-based Model Predictive Control (MPC) approach for the polytopic Linear Parameter-Varying (LPV) systems with inexact scheduling parameters (as exogenous signals with inexact bounds), where the Linear Time Invariant (LTI) models (vertices) captured by combinations of the scheduling parameters becomes wrong.
no code implementations • 25 Mar 2022 • Arash Bahari Kordabad, Hossein Nejatbakhsh Esfahani, WenQi Cai, Sebastien Gros
We show that the approximate Hessian converges to the exact Hessian at the optimal policy, and allows for a superlinear convergence in the learning, provided that the policy parametrization is rich.
no code implementations • 19 Nov 2021 • Hossein Nejatbakhsh Esfahani, Behdad Aminian, Esten Ingar Grøtli, Sebastien Gros
The aim of this paper is to propose a high performance control approach for trajectory tracking of Autonomous Underwater Vehicles (AUVs).
no code implementations • 6 Apr 2021 • Hossein Nejatbakhsh Esfahani, Arash Bahari Kordabad, Sebastien Gros
We present a Reinforcement Learning-based Robust Nonlinear Model Predictive Control (RL-RNMPC) framework for controlling nonlinear systems in the presence of disturbances and uncertainties.
no code implementations • 6 Apr 2021 • Arash Bahari Kordabad, Hossein Nejatbakhsh Esfahani, Sebastien Gros
In this paper, we discuss the deterministic policy gradient using the Actor-Critic methods based on the linear compatible advantage function approximator, where the input spaces are continuous.
no code implementations • 22 Mar 2021 • Arash Bahari Kordabad, Hossein Nejatbakhsh Esfahani, Anastasios M. Lekkas, Sébastien Gros
A scenario-tree robust MPC is used to handle potential failures of the ship thrusters.
no code implementations • 22 Mar 2021 • Hossein Nejatbakhsh Esfahani, Arash Bahari Kordabad, Sebastien Gros
This paper proposes an observer-based framework for solving Partially Observable Markov Decision Processes (POMDPs) when an accurate model is not available.