Mixed lubrication characteristics of multi-layer composite structure water-lubricated stern bearing considering fluid–structure interaction and journal misalignment effects
Chunxiao Jiao, Yuze Yang, Xuebing Zhang, Lin Xue, Donglin Zou, Jianghai Xu, Na Ta, Zhushi Rao
Abstract
In order to solve the problem of uneven pressure distribution in traditional water-lubricated bearings, a multi-layer composite structure water-lubricated bearing is proposed in this paper. Considering the fluid–structure interaction and journal misalignment effects, a mixed lubrication model of multi-layer composite structure water-lubricated bearing is established. Based on the aforementioned model, first, experimental tests are conducted to verify the accuracy of the model. Second, the lubrication characteristics of multi-layer bearing and single layer bearing are compared. Finally, the effects of external load, journal rotational speed, and aspect ratio on the pressure, film thickness, and friction coefficient of multi-layer composite structure water-lubricated bearing are investigated. The research results show that the multi-layer composite structure water-lubricated bearing can improve pressure distribution uniformity, enhance minimum film thickness, and reduce friction. By studying the lubrication characteristics of multi-layer composite structure water-lubricated bearing under different parameter conditions, it provides theoretical support for the structural optimization of water-lubricated stern bearings.