Investigation on the performance of a new type of marine permanent magnet vibration damping thrust bearing

The longitudinal vibration of the propulsion shaft system not only has a harmful impact on the shaft system itself, but also transmits the vibration of the power device to the ship through thrust bearings and other shaft support components, causing ship vibration and generating radiated noise. This article is based on magnetic support technology, a new permanent magnet vibration damping thrust bearing is designed, and experimental research on its vibration damping effect is conducted. The results show that the axial static stiffness of the permanent magnet vibration damping thrust bearing decreases with increasing displacement. The magnitude of the stiffness is 10⁷ N/m. The comparison of the vibration acceleration test results between traditional thrust bearings and permanent magnet vibration damping thrust bearings shows that the longitudinal vibration damping effect of permanent magnet vibration damping thrust bearings is 4.28dB-9.09dB in the operating range of 32-82 rpm. The multi working condition vibration reduction performance of permanent magnet vibration damping thrust bearings is verified. This can provide a new approach for longitudinal vibration control of future ship propulsion shaft systems.