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Path-following control of a ship by pushing using a single autonomous tugboat

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A Correction to this article was published on 21 August 2023

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Abstract

This paper discusses the path-following control of a ship or other floating object by pushing using a single autonomous tugboat. To do this, we first formulate a reduced dynamic equation that contains the dynamics of both the ship and the tugboat without contact force terms, and is expressed by independent variables, such as ship variables (surge, sway, and yaw rates), allowing us to deal with the ship and tugboat as a single system to control the independent variables. It is assumed in this study that the contact between the ship and tugboat is a point contact, and the contact point does not slip. To manipulate the motion of a ship by pushing, the pushing force must be exerted without slipping at the contact point. Thus, the contact force is derived from the dynamic equations of the ship and tugboat and the velocity constraints on the contact point, and its feasible region is defined. This contact force condition is then incorporated into a path-following control method using the reduced dynamic equation to handle the contact force during the pushing operation. The contact force is checked to determine whether it is likely to be exerted outside the feasible region; if so, the control gain used in the path-following control is switched to a smaller value. Simulations under different paths and contact positions are performed, and the results demonstrate that the proposed pushing control method allows the ship to follow a given path correctly while maintaining the contact condition.

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Acknowledgements

This study was supported by a research promotion program through the Korea Maritime & Ocean University Research Fund in 2022.

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Authors and Affiliations

  1. Ocean Science and Technology School, Korea Maritime and Ocean University, 727 Taejong-ro, Yeongdo-gu, Busan, 49112, South Korea

    Jin-Kyu Choi

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  1. Jin-Kyu Choi
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Correspondence to Jin-Kyu Choi.

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The original online version of this article was revised: Corrections have been made in the paragraph before the equation 31.

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Choi, JK. Path-following control of a ship by pushing using a single autonomous tugboat. J Mar Sci Technol 28, 649–657 (2023). https://doi.org/10.1007/s00773-023-00946-5

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  • DOI: https://doi.org/10.1007/s00773-023-00946-5

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