Active lateral vibration control in a shaft-plate coupled system with power flow analysis

Abstract

Power flow analysis is recognized as a powerful tool for controlling vibrations since the magnitudes and directions of power flow inside a system are directly associated with the vibration intensity. In a shafting system, the bearings are important paths for the lateral vibration of the shaft transmitting to the hull structure and induces underwater sound. In order to lower the radiated sound, a proof-mass actuator is utilized to suppress the lateral vibration transmission. A dynamic model of a shaftplate coupled system is established using the wave propagation method. Power flow analysis is performed to exhibit the power flow characteristics and distinguish the dominant path for the vibration power transmitting from the shaft to the plate. The feasibility of the active control with the proof-mass actuator is numerically evaluated. The results indicate that the reduction of the power injected into the system leads to the decrease of the plate vibration, and the power flow directions in the shaft-plate coupled system are changed as well.