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On Multiple Secondary Task Execution of Redundant Nonholonomic Mobile Manipulators

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Abstract

This paper investigates self-motion control of redundant nonholonomic mobile manipulators, to execute multiple secondary tasks including tip-over prevention, singularity removal, obstacle avoidance and physical limits escape. An extended gradient projection method (EGPM) is proposed to determine self-motion directions, and a real-time fuzzy logic self-motion planner (FLSMP) is devised to generate the corresponding self-motion magnitudes. Unlike the task-priority allocation method and the extended Jacobian method, the proposed scheme is simple to implement and is free from algorithm singularities. The proposed dynamic model is established with consideration of nonholonomic constraints of the mobile platform, interactive motions between the mobile platform and the onboard manipulator, as well as self-motions allowed by redundancy of the entire robot. Furthermore, a robust adaptive neural-network controller (RANNC) is developed to accomplish multiple secondary tasks without affecting the primary one in the workspace. The RANNC does not rely on precise prior knowledge of dynamic parameters and can suppress bounded external disturbance effectively. In addition, the RANNC does not require any off-line training and can ensure the control performance by online adjusting the neural-network parameters through adaptation laws. The effectiveness of the proposed algorithm is verified via simulations on a three-wheeled redundant nonholonomic mobile manipulator.

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Authors and Affiliations

  1. Department of Aerospace Engineering, Ryerson University, Toronto, Ontario, Canada, M5B 2K3

    Yugang Liu & Guangjun Liu

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  1. Yugang Liu
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  2. Guangjun Liu
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Correspondence to Guangjun Liu.

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Liu, Y., Liu, G. On Multiple Secondary Task Execution of Redundant Nonholonomic Mobile Manipulators. J Intell Robot Syst 56, 365 (2009). https://doi.org/10.1007/s10846-009-9323-0

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