Abstract
ABSTRACT To ensure an effective and smooth operation of shipborne equipment and show ships’ vitality, the floating raft is universally used to reduce mechanical vibration and underwater-radiated noise. However, the vibration amplification phenomenon still occurs in low-frequency excitation of shipborne equipment. Accordingly, a new idea for enhancing vibration reduction and isolation performance of floating rafts for shipborne equipment based on particle damping is proposed. Considering particle-particle frictions and collisions inside the damper, a mathematical model of particle damping using the two-phase flow theory of gas-particle is derived for the dynamic analysis combined with the finite element method. The damping effect for vibration reduction is obtained by dynamic analysis with different dampers-installation schemes in raft structures. An experimental platform for the floating raft with particle dampers is built. Comparing its dynamic analysis with experimental investigation results, the rationality and feasibility of the mathematical model of particle damping are demonstrated. In addition, this research further indicates that particle damping enhances the vibration isolation performance of floating rafts in low-frequency excitation for shipborne equipment, which is of great practical significance to improve the combat effectiveness of ships.
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