Caption: Figure 15: The structure diagram of [H.sub.[infinity]] control for the floating raft system.
Theoretical modeling for floating raft systems can be summarized as multibody dynamics , impedance mode method , four-terminal parameter method , finite element method , statistical energy analysis , power flow method , and so on.
Floating raft systems are generally subject to multiple frequency varying vibrations.
There are two transmission paths in the floating raft system: via supporting structure such as upper and lower isolators and via attached pipes.
The whole FRF matrix of a representative floating raft system is built by using the developed method.
Wen, "Suppression of vibration and noise radiation in a flexible floating raft system using periodic structures," Journal of Vibration and Control, vol.
Caption: FIGURE 1: Sketch of the floating raft system with attached equipment.
Caption: FIGURE 3: Sketch of the floating raft system: (a) front view, (b) sectional view.
Caption: FIGURE 6: (a) Test model of the raft; (b) test model of the hull with base; (c) test model of the floating raft system without attached pipes.
Caption: FIGURE 7: Comparison of the measured FRFs and the synthesis results for floating raft system without attached pipes: (a) driving FRF of the exciting point; (b) transfer FRF from exciting point to one point on top surface of the raft; (c) transfer FRF from exciting point to one point on bottom surface of the raft.
Caption: FIGURE 8: (a) FRF test setup of the floating raft system with attached pipes; (b) a close view of pipes and masses connection.