The present work is based on the use of a TMD element to reduce the platform mass and a novel optimization approach to minimize the cost of the platform. Drawing from a 2018 proof-of-concept basin test of a 1:50 scale semi-submersible platform with TMDs utilizing water ballast, potential was seen for a platform concept taking advantage of the motion mitigation properties of the TMD [11]. A photo of the test is shown in Figure 1. Since semi-submersible designs already require significant amounts of ballast to float with much of their height underwater, the ballast water can be used by the TMD to stabilize the platform without adding mass. Furthermore, with the motion mitigation from the TMD, the wave periods do not need to be avoided so the waterplane area of the platform can be reduced, reducing the mass of the material used in the platform. The optimization assumed a TMD element-motivating water ballast as the effective mass of the TMD, similar to [11].
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