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Influence of Thrust Bearing’s Oil Film Stiffness on the Coupled Vibration of the Shafting - ship Hull Structure
LI Dong-liang;CHEN Yong;ZHANG Zhi-yi;HUA Hong-xing
2011, 31 (6):
81-85.
DOI: 10.3969/j.issn.1006-1355-2011.06.018
Thrust bearing is one of the most important components which affect the coupled vibration of the shafting-hull coupled structure. Its impedance characteristics affect the transmission characteristics of the longitudinal oscillatory force from the propeller to the hull structure directly. So, the thrust bearing’s oil film stiffness in the ship propulsion system has a critical influence on the coupled vibration of the shafting-ship hull structure. The thrust bearing’s dynamic characteristics have been investigated in this paper and the thrust bearing’s oil film stiffness at different propulsion speeds is obtained, which is further applied to the dynamic model of the shafting-hull structure. The coupled vibration of the shafting-hull structure at different propulsion speeds is analyzed. The results show that the thrust bearing’s oil film stiffness at the low and medium propulsion speeds is the leading factor that affects the transmission of the longitudinal oscillatory force from the propeller to the hull structure, hence it must be considered in the prediction and control of the hull-structure’s vibration and acoustic radiation induced by the longitudinal oscillatory force.
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