For investigating liquid loads in tanks and on custom geometries, MARINTEK has developed a sloshing laboratory with two motion platforms and a drop rig for deterministic water impacts. The motion platforms are custom made for exciting scaled vessel motions.
The 6 DOF vessel motion simulator
Based on vessel motion RAOs and sea-state inputs, the rig can do model scaled motions at a given position on a vessel. Each degree of freedom is independent and can be enabled / disabled accordingly. The rig is electric driven with servo motors from Bosch Rexroth. Static weight of rig and payload is balanced by using two air cylinders with accumulators. Motions applied to the rig is loaded from a pre generated 6 DOF binary file format. This solution makes it possible for clients to easily choose between MARINTEK generated, and their own generated vessel motions as input to the rig.
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The 2 DOF vessel motion simulator
The control system of the 2 DOF rig is similar to that of the 6 DOF rig. Based on vessel motion RAOs and sea-state inputs, the rig can do model scaled motions at a given position on a vessel in 2 degrees-of-freedom (typically sway and roll). Each degree of freedom is independent and can be enabled / disabled accordingly. The rig is electric driven with servo motors from Bosch Rexroth. Motions applied to the rig is loaded from a pre generated 2 DOF binary file format. This solution makes it possible for clients to easily choose between MARINTEK generated, and their own generated vessel motions as input to the rig.
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The drop rig
The drop rig is a rig specifically designed for studying slamming physics including high-speed measurements and video. The internal measures of the drop tank are: 4000 mm wide, a depth of 283 mm and a height of 1500 mm.
The standard wedge has a total drop weight of approximately 160 kg and the dead rise angle is 10 degrees. The drop height can be varied between 100 mm and 2.25 m from the apex of the wedge to the free surface. Customized wedges can be made for specific projects.
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