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Reinforcement Learning to improve delta robot throws for sorting scrap metal
Louette, Arthur; Lambrechts, Gaspard; Ernst, Damien et al.
2024
 

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Keywords :
Delta robot, reinforcement learning, PyBullet
Abstract :
[en] This study proposes a novel approach based on reinforcement learning (RL) to enhance the sorting efficiency of scrap metal using delta robots and a Pick-and-Place (PaP) process, widely used in the industry. We use three classical model-free RL algorithms (TD3, SAC and PPO) to reduce the time to sort metal scraps. We learn the release position and speed needed to throw an object in a bin instead of moving to the exact bin location, as with the classical PaP technique. Our contribution is threefold. First, we provide a new simulation environment for learning RL-based Pick-and-Throw (PaT) strategies for parallel grippers. Second, we use RL algorithms for learning this task in this environment resulting in 89.32\% accuracy while speeding up the throughput by 51\% in simulation. Third, we evaluate the performances of RL algorithms and compare them to a PaP and a state-of-the-art PaT method both in simulation and reality, learning only from simulation with domain randomisation and without fine tuning in reality to transfer our policies. This work shows the benefits of RL-based PaT compared to PaP or classical optimization PaT techniques used in the industry.
Research Center/Unit :
Montefiore Institute - Montefiore Institute of Electrical Engineering and Computer Science - ULiège
Disciplines :
Computer science
Author, co-author :
Louette, Arthur ;  Université de Liège - ULiège > Montefiore Institute of Electrical Engineering and Computer Science
Lambrechts, Gaspard 
Ernst, Damien  
Pirard, Eric  
Dislaire, Godefroid 
Language :
English
Title :
Reinforcement Learning to improve delta robot throws for sorting scrap metal
Publication date :
21 June 2024
Tags :
CÉCI : Consortium des Équipements de Calcul Intensif
Development Goals :
12. Responsible consumption and production
Available on ORBi :
since 21 June 2024

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