Two-point support-based three-degree-of-freedom motion test mechanism for ship in waves

The invention discloses a two-point support-based three-degree-of-freedom motion test mechanism for a ship in waves, and belongs to the technical field of ship seakeeping experiments. The motion test mechanism comprises an operation frame, a rolling assembly, a heaving assembly and a pitching assembly. The rolling assembly comprises a rolling shaft, a rolling frame and a second connecting piece, the rolling frame is fixedly installed on the inner wall of the ship, the rolling shaft penetrates through the rolling frame and is arranged along the central axis of the ship in the bow and stern direction, and the second connecting piece is fixedly installed in the middle of the rolling shaft; the upper end of the heaving assembly is arranged on the operation frame, the lower end of the heaving assembly is connected to the second connecting piece through the first connecting piece, and the second connecting piece can rotate around the first connecting piece; and the upper end of the pitching assembly is fixedly conn