Forced motion testing is one of the basic tools of hydrodynamic model testing. It is used to determine ship performance – from the most basic resistance testing to more advanced seakeeping and loads testing. A novel three degree-of-freedom motion mechanism is described, which enables large amplitude, forced oscillation model testing. The mechanism has been used to produce extreme roll angles about a virtual center of roll that can be adjusted on the- fly in the control software. The mechanism has also been used to enable forced sway and forced heave testing, and can also be used to produce combinations of all three motions. Basic theory and details of the concept design, detailed design, construction considerations, and control software as well as experimental uses and considerations for future improvements are presented and discussed.

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