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Reinforcement Learning-Based Safe Path Planning for a 3R Planar Robot
BİNGOL, Mustafa Can
Sakarya Üniversitesi Fen Bilimleri Enstitüsü Dergisi, 2022-02, Vol.26 (1), p.128-135
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Título:
Reinforcement Learning-Based Safe Path Planning for a 3R Planar Robot
Autor:
BİNGOL, Mustafa Can
É parte de:
Sakarya Üniversitesi Fen Bilimleri Enstitüsü Dergisi, 2022-02, Vol.26 (1), p.128-135
Descrição:
Path planning is an essential topic of robotics studies. Robotic researchers have suggested some methods such as particle swarm optimization, A*, and reinforcement learning (RL) to obtain a path. In the current study, it was aimed to generate RL-based safe path planning for a 3R planar robot. For this purpose, firstly, the environment was performed. Later, state, action, reward, and terminate functions were determined. Lastly, actor and critic artificial neural networks (ANN), which are basic components of deep deterministic policy gradients (DDPG), were formed in order to generate a safe path. Another aim of the current study was to obtain an optimum actor ANN. Different ANN structures that have 2, 4, and 8-layers and 512, 1024, 2048, and 4096-units were formed to get an optimum actor ANN. These formed ANN structures were trained during 5000 episodes and 200 steps and the best results were obtained by 4-layer, 1024, and 2048-units structures. Owing to this reason, 4 different ANN structures were performed utilizing 4-layer, 1024, and 2048-units. The proposed structures were trained. The NET-M2U-4L structure generated the best result among 4 different proposed structures. The NET-M2U-4L structure was tested by using 1000 different scenarios. As a result of the tests, the rate of generating a safe path was calculated as 93.80% and the rate of colliding to the obstacle was computed as 1.70%. As a consequence, a safe path was planned and an optimum actor ANN was obtained for a 3R planar robot.
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Inglês
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