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Disturbance compensation of a dual-arm underwater robot via redundant parallel mechanism theory

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Abstract

Disturbance compensation is one of the major issues for underwater robots to hover as a mobile platform and to manipulate an object in an underwater environment. This paper presents a new strategy of disturbance compensation for a mobile dual-arm underwater robot using internal torques derived from redundant parallel mechanism theory. A model of the robot was analyzed by redundant serial and parallel mechanisms at the same time. The joint torque to operate the robot is obtained from a redundant serial mechanism model with null-space projection due to redundancy. The joint torque derived from the redundant parallel kinematic model is calculated to perfectly compensate for disturbances to the mobile platform and is included in the solution of the joint torque based on the serial redundant model. The resultant joint torque can generate force on the end-effector for required tasks and forces for disturbance compensation simultaneously . A simulation shows the performance of this disturbance compensation strategy. The joint torque based on the algorithm generates the desired task force and the disturbance compensation force together, and a little additional joint torque can generate a large internal force effectively due to the characteristics of a redundant parallel mechanism. The proposed method is more effective than compensation methods using thrusting force on the mobile platform.

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Acknowledgments

This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2014R1A1A4A01009290).

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Authors and Affiliations

  1. School of Mechanical and Aerospace Engineering, Seoul National University, Seoul, 151-019, Republic of Korea

    Sangrok Jin, Jangho Bae & Jongwon Kim

  2. School of Mechanical Engineering, Yeungnam University, Gyeongsan, 712-749, Republic of Korea

    TaeWon Seo

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  1. Sangrok Jin
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  2. Jangho Bae
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  3. Jongwon Kim
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  4. TaeWon Seo
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Correspondence to Jongwon Kim or TaeWon Seo.

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Jin, S., Bae, J., Kim, J. et al. Disturbance compensation of a dual-arm underwater robot via redundant parallel mechanism theory. Meccanica 52, 1711–1719 (2017). https://doi.org/10.1007/s11012-016-0505-0

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  • DOI: https://doi.org/10.1007/s11012-016-0505-0

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