Influence of thrust bearing seating on acoustic radiation of submarine

Abstract

[Objectives] In this paper, the influence of thrust bearing seating on the acoustic radiation of a submarine is studied. [Methods] By utilizing the Finite Element(FE)method and FE coupling fluid interface method, the structure vibration of the pressure hull is calculated with different distributions of longitudinal exciting forces. In this case, the symmetrical distribution of exciting forces and moments are beneficial for reducing vibration. According to the above conclusions, symmetrical thrust bearing seating is designed and the longitudinal stiffness of the system controlled through choosing the size of components. Two submarines are designed, one with conventional thrust bearing seating and the other one with symmetrical thrust bearing seating. The vibration response and radiation noise of the structures of the two submarines are forecasted. [Results] It can been seen that when the propeller longitudinal force is constant, symmetrical thrust bearing seating can significantly decrease the level of vibration and radiation noise. [Conclusions] The results can provide references for the acoustic optimization and design of the thrust bearing seating of submarines.

Keywords

• thrust bearing
• structural vibration
• radiation noise
• peak frequency
• vibration mode