11/15/2023 0 Comments Lian yu mobile craneHowever, there is no equipment to handle such Tera-blocks. The Mega-erection and Giga-erection in the ship building are used to handle heavier and wider blocks and modules as ships and off-shore platforms are enlarged. This paper proposes a dual lifting and its cooperative control system with two different kinds of floating cranes. Mihee Nam Jinbeom Kim Jaechang Lee Daekyung Kim Donghyuk Lee Jangmyung Lee It is verified that the dual lifting can be applied for many heavier and wider blocks and modules to shorten the construction time of ships and off-shore platforms. The moving angles of the lifting module are analyzed and verified to be suitable for hoisting control. The developed control system has been embedded in the real floating crane systems and the dual lifting has been demonstrated five times at SHI shipyard in 2015. The master crane is able to gather information about all working conditions and make a decision to control the individual hook speed, which communicates the slave crane by TCP/IP. Two floating cranes are handled as a master-slave system. In order words, it is necessary to develop the cooperative control of two floating cranes in order to sustain a center of gravity of the module and minimize the tilting angle during the lifting and unloading by the two floating cranes. Two main constraints for the dual lifting are as follows: First, two barges of floating cranes should be constrained as a rigid body not to cause a relative motion between two barges and main hooks of the two cranes should be controlled as main hooks of a single crane. In the dual lifting, two floating cranes are well-coordinated to add up the lift capabilities of both cranes without any loss such that virtually a single crane is lifting, maneuvering and unloading. In order to overcome the limit on performance of existing floating cranes, the dual lifting is proposed in this research. 3 refs., 17 figs., 1 tab.Ĭooperative control system of the floating cranes for the dual liftingĭirectory of Open Access Journals (Sweden)įull Text Available This paper proposes a dual lifting and its cooperative control system with two different kinds of floating cranes. As opposed, an estimated value of a dynamic load when the crane structure is regarded as a rigid body is 13%, which is 2.6 times as great as the case that considers deformation of the crane structure. If a case that considers elastic deformation in the crane structure is compared with a case that does not consider same in calculating hull motions of the floating crane, the difference between them is small if wave length /L is 1.5. Discussions were given on a dynamic load acting on a lifted load. Analyses were made on motions in waves of a floating crane with a lifting load of 3,600 tons, with considerations given to deformation of the crane structure. Identifying a dynamic load acting on a lifted load in a floating crane moving in waves is important for preparing an operation manual for the floating crane. [Hiroshima University, Hiroshima (Japan). Wave response analyses of floating crane structure Crane sen no jobu kozobutsu no haro otoĮnergy Technology Data Exchange (ETDEWEB)
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