Article: A real-time motion planning scheme for collaborative robots using HRI-based cost function Journal: International Journal of Mechatronics and Automation (IJMA) 2021 Vol.8 No.1 pp.42 - 52 Abstract: In this paper, we propose a novel scheme for real-time motion planning of a collaborative robot that assists its fellow human worker in performing assembly tasks by delivering parts and tools to the worker. In the proposed scheme, the delivery position of the parts and tools is determined first, based on a cost function relating to the safety, visibility, and arm comfort terms of the worker by solving the non-convex optimisation problem in real-time using a random sampling-based algorithm in the vicinity of the worker's current position. Then, model predictive control (MPC)-based trajectory planner directly generates a collision-free robot trajectory from the current robot configuration to the delivery configuration under velocity and acceleration constraints of the robot. The proposed motion planning scheme is implemented in the actual collaborative robot system and the effectiveness of the proposed scheme is illustrated experimentally. Inderscience Publishers - linking academia, business and industry through research

Title: A real-time motion planning scheme for collaborative robots using HRI-based cost function

Authors: Khawaja Fahad Iqbal; Akira Kanazawa; Silvia Romana Ottaviani; Jun Kinugawa; Kazuhiro Kosuge

Addresses: System Robotics Laboratory, Department of Robotics, Tohoku University, Sendai, Japan; RISE Laboratory, Department of Robotics and Artificial Intelligence, School of Mechanical and Manufacturing Engineering (SMME), National University of Sciences and Technology (NUST), Islamabad, Pakistan ' System Robotics Laboratory, Department of Robotics, Tohoku University, Sendai, Japan ' Leonardo Company, Via Giovanni Agusta 520, 21017 Cascina Costa, VA, Italy ' System Robotics Laboratory, Department of Robotics, Tohoku University, Sendai, Japan ' System Robotics Laboratory, Department of Robotics, Tohoku University, Sendai, Japan

Abstract: In this paper, we propose a novel scheme for real-time motion planning of a collaborative robot that assists its fellow human worker in performing assembly tasks by delivering parts and tools to the worker. In the proposed scheme, the delivery position of the parts and tools is determined first, based on a cost function relating to the safety, visibility, and arm comfort terms of the worker by solving the non-convex optimisation problem in real-time using a random sampling-based algorithm in the vicinity of the worker's current position. Then, model predictive control (MPC)-based trajectory planner directly generates a collision-free robot trajectory from the current robot configuration to the delivery configuration under velocity and acceleration constraints of the robot. The proposed motion planning scheme is implemented in the actual collaborative robot system and the effectiveness of the proposed scheme is illustrated experimentally.

Keywords: collaborative robot; motion planning; human-robot interaction.

DOI: 10.1504/IJMA.2021.113727

International Journal of Mechatronics and Automation, 2021 Vol.8 No.1, pp.42 - 52

Received: 21 Oct 2020
Accepted: 26 Nov 2020
Published online: 19 Mar 2021 *

Title: A real-time motion planning scheme for collaborative robots using HRI-based cost function

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