ACTIVE CONTROL OF LATERAL VIBRATION OF A SHAFT-HULL COUPLED SYSTEM

摘要

A propulsion shafting system can excite the hull structure through its bearings and resultingly induces vibrations in the hull. To suppress lateral vibration transmission, a new method using electromagnetic bearings in the shafting system is proposed. For the purpose of theoretical investigation, dynamic characteristics of the electromagnetic bearing are analyzed at first, and subsequently a dynamic model of the shafting-hull coupled system is established to derive the frequency response functions with the help of the Frequency Response Synthesis method, and finally the influence of the electromagnetic bearing stiffness and damping on the vibration of the shafting-hull system is evaluated. Simulation results demonstrate that the proposed approach is effective in suppressing vibration transmission in the shafting system and can be regarded as an optional method for systematic vibration control of shafting-hull systems.