An isobaric extended stern bearing based on a negative poisson's ratio topological inner liner structure

By designing an isobaric extended stern bearing with a negative Poisson's ratio topological liner structure, the tangential expansion deformation of the bearing liner under radial compression is achieved, solving the contact pressure concentration problem of traditional bearings under eccentric loading and pressure gradient changes, and improving water film stability and load-bearing capacity.

CN121993490BActive Publication Date: 2026-06-09DALIAN UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
DALIAN UNIV OF TECH
Filing Date
2026-04-07
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Traditional water-lubricated stern bearing liners are difficult to achieve radial and tangential deformation linkage under shaft off-center load and pressure gradient changes, resulting in localized concentration of contact pressure, uneven distribution of water film thickness, and easy wear. Furthermore, existing negative Poisson's ratio structure research has not fully considered the fluid lubrication environment and off-center load conditions of ship stern bearings.

Method used

A pressure-expanding stern bearing based on a negative Poisson's ratio topological liner structure is designed. The negative Poisson's ratio topological layer induces tangential expansion deformation under radial compression, which, combined with the water film, forms a pressure-expanding effect, actively reconstructing the morphology of the bearing liner contact interface and achieving uniform contact pressure distribution.

Benefits of technology

Under low-speed, heavy-load conditions, it significantly reduces peak contact pressure, suppresses edge wear, improves water film stability and load-bearing capacity, adapts to different shaft lubrication conditions, and enhances the bearing's steady-state load-bearing capacity and noise reduction performance.

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Abstract

The application belongs to the technical field of bearing structure design and vibration control of ship propulsion system, and discloses an isobaric expansion stern bearing based on a negative Poisson's ratio topological inner lining structure, wherein the negative Poisson's ratio topological layer is composed of geometric topological units and produces tangential expansion deformation under the action of a radial load. Through the negative Poisson's ratio effect, the radial compression load of the shaft system is converted into a circumferential expansion response, the isobaric expansion of the shaft-lining contact area is realized, the effective bearing area is increased, and the contact pressure distribution is homogenized. The topological inner lining is divided into a head end topological region, a transition region, a middle topological region, a transition region and a stern end topological region in the axial direction, and the geometric parameters of the topological units, the equivalent Poisson's ratio and the thickness of the negative Poisson's ratio topological layer are adjusted in each region to adapt to the non-uniform distribution of shaft bending, partial load and lubrication state under low-speed heavy-load conditions. The application can significantly reduce edge high pressure and local wear, improve water film stability, and improve the carrying capacity, vibration reduction and noise reduction performance and service life of the stern bearing.
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