# Publication

International Journal
2015.08.26 15:32

# Seung-Ho Ham, Myung-Il Roh, Hye-Won Lee, "Simulation of Load Lifting with Equalizers Used in Shipyards", Automation in Construction, Vol. 61, pp. 98-111, 2016.02.01

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Abstract One of the most commonly used pieces of equipment for lifting a load is the equalizer of a crane in shipbuilding production. The equalizer distributes the tension in wire ropes between the load and equipment equally. While the equalizer is composed simply of several fixed and moving pulleys, themechanismof an equalizer is not easy to adapt to physics-based simulations because only onewire rope is coiled around all of the pulleys. Thus, instead of the real mechanism of the equalizer, an alternative mechanism, such as stretching or shortening the initial lengths of the wire ropes, logically, has been used in previous simulations. In this study, a mass-less constraint-based wire rope is adopted to realize the real mechanism of the equalizer. The constant length constraint is used to realize one wire rope among the fixed and moving equalizer pulleys. We derive a discrete Euler–Lagrange (DEL) equation to represent the motion of a multibody system including the constraint wire ropes. The DEL equation is shown to be numerically stable for the case of linear holonomic constraints, such as the constant length constraint. Wetest several series of fixed and moving pulleys andmodel the equalizer based on the real mechanism. Finally, the equalizer based on the real mechanism is applied to two typical lifting cases in shipbuilding production. One is lifting a load using a Goliath cranewith three equalizers and the other is to use a floating cranewith one equalizer and two crawler cranes. As a result, the tensions in the wire ropes connected to the load are adjusted equally as the position of the moving pulleys and the orientation of the equalizer change. 2016-02-01 Corresponding Author SCIE 2.442

Seung-Ho Ham, Myung-Il Roh, Hye-Won Lee, "Simulation of Load Lifting with Equalizers Used in Shipyards", Automation in Construction, Vol. 61, pp. 98-111, 2016.02.01

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1. ### Tae-Sub Um, Myung-Il Roh, "Optimal Dimension Design of a Hatch Cover for Lightening a Bulk Carrier", International Journal of Naval Architecture and Ocean Engineering, Vol. 7, No. 2, pp. 270-287, 2015.03.01

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9. ### Sol Ha, Nam-Kug Ku, Myung-Il Roh, Ho-Jin Hwang, "Multibody System Dynamics Simulator for Process Simulation of Ships and Offshore Plants in Shipyards", Advances In Engineering Software, Vol. 85, pp. 12-25, 2015.07.01

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10. ### Sol Ha, Seong-Ho Seo, Myung-Il Roh, Hyun-Kyoung Shin, "Simplified Nonlinear Model for the Weight Estimation of FPSO Plant Topside Using the Statistical Method", Ships and Offshore Structures, Vol. 11, No. 6, pp. 603-619, 2016.09.01

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11. ### Luman Zhao, Myung-Il Roh, Jeong-Woo Hong, "Optimal Thrust Allocation for Dynamic Positioning of Deep-sea Working Vessel", Journal of Advanced Research in Ocean Engineering, Vol. 1, No. 2, pp. 94-105, 2015.06.01

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12. ### Ki-Su Kim, Myung-Il Roh, Sol Ha, "Expert System Based on the Arrangement Evaluation Model for the Arrangement Design of a Submarine", Expert Systems with Applications, Vol. 42, No. 22, pp. 8731-8744, 2015.12.01

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13. ### Hye-Won Lee, Myung-Il Roh, Seung-Ho Ham, Sol Ha, "Dynamic Simulation of the Wireline Riser Tensioner System for a Mobile Offshore Drilling Unit Based on Multibody System Dynamics", Ocean Engineering, Vol. 106, pp. 485-495, 2015.09.15

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14. ### 함승호, 노명일, 김주성, 이혜원, 하솔, "환경 하중을 고려한 침몰 선체의 물리 기반 인양 시뮬레이션", 대한조선학회 논문집, Vol. 5, No. 5, pp. 387-394, 2015.10.01

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17. ### Dong-Hoon Jeong, Myung-Il Roh, Seung-Ho Ham, "Lifting Off Simulation of an Offshore Supply Vessel Considering Ocean Environmental Loads and Lifting Off Velocity", Ocean Systems Engineering, Vol. 5, No. 3, pp. 181-198, 2015.09.01

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18. ### Seung-Ho Ham, Myung-Il Roh, Hye-Won Lee, Sol Ha, "Multibody Dynamic Analysis of a Heavy Load Suspended by a Floating Crane with Constraint-based Wire Rope", Ocean Engineering, Vol. 109, pp. 145-160, 2015.11.15

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19. ### Seung-Ho Ham, Myung-Il Roh, Hye-Won Lee, "Simulation of Load Lifting with Equalizers Used in Shipyards", Automation in Construction, Vol. 61, pp. 98-111, 2016.02.01

CategoryInternational Journal
20. ### Sol Ha, Nam-Kug Ku, Myung-Il Roh, "Event-based Scenario Manager for Multibody Dynamics Simulation of Heavy Load Lifting Operations in Shipyards", International Journal of Naval Architecture and Ocean Engineering, Vol. 8, No. 1, pp. 83-101, 2016.01.01

CategoryInternational Journal
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