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Abstract In general, tugboats are used to transport many kinds of unactuated vessels such as ships and offshore structures. This requires an adequate model of tugboats operation to take into account surge, sway, and yaw motions precisely. In this study, we present an optimization method of tugboats operation for transporting an offshore floating crane in shipyard. An optimization problem including the interactions between the crane and tugboats is mathematically formulated. The procedure to solve this problem is composed of two steps. First, the required total thrust force and moment acting on the crane are calculated to make it arrive the target position with desired velocity and direction in the presence of environmental disturbances. Second, the optimization problem is solved by using the genetic algorithms (GA) to find total number of the required tugboats, position, thrust, and direction of each tugboat. The proposed approach is applied to the transportation of the offshore floating crane in the various environmental conditions such as waves, winds, and currents.
Publication Date 2017-01-21

Seung-Min Lee, Myung-Il Roh, Ki-Su Kim, Seung-Ho Ham, "Optimization of Tugboats Operation for Transporting an Offshore Floating Crane in Environmental Disturbance", Proceedings of International Conference on Mechanical Design and Engineering, HonKong, China, 2017.01.20-22


  1. Ki-Su Kim, Myung-Il Roh, Ju-Sung Kim, "A Method of Dynamic Flooding Analysis in Time Domain for the Compartment Arrangement Design of a Ship", Proceedings of ISOPE 2017, San Francisco, USA, pp. 862-866, 2017.06.25-30

  2. Seung-Ho Ham, Myung-Il Roh, "Multibody Formulation of a Load-out Problem of a Mega Block Using Modular Transporters in Shipbuilding Industry", Proceedings of the 8th ECCOMAS Thematic Conference on Multibody Dynamics, Prague, Czech, 2017.06.19-22

  3. Seung-Ho Ham, Myung-Il Roh, Hye-Won Lee, "Collision Analysis of the Subsea Equipment on the Offshore Supply Vessel Using Non-Interpenetration Constraints", International Conference on Mechanical Design and Engineering, HongKong, China, 2017.01.20-22

  4. No Image 07Feb
    by SyDLab
    in International Conference

    Seung-Min Lee, Myung-Il Roh, Ki-Su Kim, Seung-Ho Ham, "Optimization of Tugboats Operation for Transporting an Offshore Floating Crane in Environmental Disturbance", International Conference on Mechanical Design and Engineering, 2017.01.20-22

  5. Ki-Su Kim, Myung-Il Roh, Sung-Min Lee, "A Simultaneous Optimization Method of the Direction and Speed for Ship Route Planning", Proceedings of Smart Ship Technology 2017, London, England, 2017.01.24-25

  6. Sung-Min Lee, Myung-Il Roh, Ki-Su Kim, "Determination of Economical Ship Route Using Simultaneous Optimization Method", Proceedings of ACDDE 2016, Jeju, Korea, 2016.10.25-28

  7. Hye-Won Lee, Myung-Il Roh, Seung-Ho Ham, "Collision Analysis of Block Erection by a Floating Crane", Proceedings of ACDDE 2016, Jeju, Korea, 2016.10.25-28

  8. Seung-Ho Ham, Myung-Il Roh, Hye-Won Lee, "Dynamic Analysis for Design and Production in Shipbuilding", Proceedings of ACDDE 2016, Jeju, Korea, 2016.10.25-28

  9. Hye-Won Lee, Myung-Il Roh, Seung-Ho Ham, "Dynamics-based Collision Analysis for Block Erection in Shipyard", Proceedings of the 30th Asian-Pacific TEAM 2016, Mokpo, Korea, 2016.10.10-13

  10. Ju-Sung Kim, Myung-Il Roh, Seung-Ho Ham, Ki-Su Kim, "Dynamic Method for Flooding Simulation of a Damaged Floater Considering Ocean Environmental Loads", Proceedings of the 30th Asian-Pacific TEAM 2016, Mokpo, Korea, 2016.10.10-13

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