A multi-connected floating body system composed of many connected small-scale floating body units has a number of advantages with regard to construction and performance compared with a united floating body. To design the multiconnected floating body system, it is necessary to grasp the exact response characteristics of the multi-connected floating body system in waves. A model basin test and a theoretical calculation were conducted for the multi-connected floating body system in waves. In the model basin test, three floating body unit models with a regular hexagonal water plane were connected to each other with a newly conceived mechanical connecting device. As a result, the response characteristics of the multi-connected floating body system in waves were clarified experimentally and theoretically, and the applicability of a theoretical calculation method was experimentally confirmed.

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