CN-121993490-A - Isobaric expansion type stern bearing based on negative poisson ratio topological lining structure

CN121993490ACN 121993490 ACN121993490 ACN 121993490ACN-121993490-A

Abstract

The invention belongs to the technical field of bearing structure design and vibration control of ship propulsion systems, and discloses an isobaric expansion type stern bearing based on a negative poisson ratio topological lining structure, wherein a negative poisson ratio topological layer is formed by geometric topological units, and tangential expansion deformation is generated under the action of radial load. The radial compression load of the shafting is converted into circumferential expansion response through the negative poisson ratio effect, so that the isobaric expansion of the shaft-liner contact area is realized, the effective bearing area is increased, and the contact pressure distribution is homogenized. The topological lining is axially divided into a head-end topological area, a transition area, a middle topological area, a transition area and a stern-end topological area, and the areas are adapted to the uneven distribution of shafting bending, unbalanced load and lubrication states under the working condition of low speed and heavy load by regulating and controlling the geometric parameters of the topological unit, the equivalent poisson ratio and the thickness of a negative poisson ratio topological layer. The invention can obviously reduce edge high pressure and local abrasion, improve the stability of a water film, and improve the bearing capacity, vibration reduction and noise reduction performance and service life of the stern bearing.

Inventors

YAN YING
Yao Zhuoxin
ZHOU MENGDE
CHENG XIKANG
YUAN WENTAO
WANG ZIXIAO
ZHOU JIAJU
JIN JINGHAO
LIU WEI

Assignees

大连理工大学

Dates

Publication Date: 20260508
Application Date: 20260407

Claims (9)

1. The isobaric expansion type stern bearing based on the negative poisson ratio topological lining structure is characterized by sequentially comprising a bearing shell, a negative poisson ratio topological layer and a lining matrix from outside to inside; The bearing shell is used for bearing and fixing a lining structure formed by a lining matrix and a negative poisson ratio topological layer, and is connected with the lining structure in a mechanical jogging or bonding mode; the negative poisson ratio topological layer is composed of periodic geometric topological units, is arranged between the lining matrix and the bearing shell, and is connected with the lining matrix through a co-pouring mode or flexible glue; the lining matrix forms a lubrication interface with the shaft.
2. The isobaric expansion type stern bearing based on the negative poisson ratio topological lining structure according to claim 1, wherein the bearing housing is made of a metal material.
3. The isobaric expansion type stern bearing based on the negative poisson ratio topological lining structure according to claim 1, wherein the lining matrix is made of rubber or polyurethane composite materials.
4. The isobaric expansion stern bearing based on a negative poisson's ratio topological lining structure according to claim 1, characterized in that the negative poisson's ratio topological layer is made of a polyetheretherketone composite or a polyamide composite.
5. The isobaric expansion type stern bearing based on the negative poisson ratio topological lining structure according to claim 1, wherein the structural form of the periodic geometric topological unit is a reentrant honeycomb structure, a star-shaped lattice structure, a rotatable regular polygon unit structure or a similar negative poisson ratio structure formed by staggered grooving, tangential expansion is generated when the lining structure is radially pressed, the equivalent poisson ratio is regulated by regulating and controlling parameters such as unit reentry angle, unit rib length ratio and the like of the geometric topological unit, and the rigidity and expansion effect of the lining structure are regulated and controlled by regulating and controlling the thickness of a topological layer with the negative poisson ratio and the equivalent poisson ratio.
6. The isobaric expansion type stern bearing based on the negative poisson ratio topological lining structure according to claim 1, wherein the negative poisson ratio topological layer is divided into five areas in axial sequence, namely a head topological area, a transition area between the head topological area and a middle topological area, a transition area between the middle topological area and a stern topological area, wherein the structural form of the head topological area and the stern topological area is identical to the geometric parameters, the geometric parameters of the transition area between the head topological area and the middle topological area and the transition area between the middle topological area and the stern topological area are identical, and the structural form is symmetrical with respect to the middle topological area.
7. The isobaric expansion type stern bearing based on the negative poisson ratio topological lining structure, according to claim 6, is characterized in that the head-end topological area and the stern-end topological area correspond to shaft sections at two ends of the bearing, the equivalent poisson ratio is-0.4 to-0.6, the thicknesses of the head-end topological area and the stern-end topological area are 45% -60% of the total thickness of the lining structure, the unit reentrant angle θ=45 ° -55 °, and the unit rib length ratio t/l of the geometric topological unit=0.10-0.14.
8. The isobaric expansion type stern bearing based on the negative poisson ratio topological lining structure, according to claim 6, is characterized in that the middle topological area corresponds to a bearing middle section, the equivalent poisson ratio of the bearing middle section is-0.15 to-0.25, the thickness of the middle topological area is 30% -40% of the total thickness of the lining structure, the unit reentrant angle θ=30 ° -40 of the geometric topological unit, and the unit rib length ratio t/l of the geometric topological unit=0.15-0.20.
9. The isobaric expansion type stern bearing based on the negative poisson ratio topological lining structure according to claim 6 is characterized in that the transition zone realizes smooth transition of geometric parameters by adjusting a unit reentrant angle theta of a geometric topological unit, a unit rib length ratio t/l of the geometric topological unit and a thickness h t of a negative poisson ratio topological layer, and the values of the unit reentrant angle theta of the geometric topological unit of the transition zone, the unit rib length ratio t/l of the geometric topological unit and the thickness h t of the negative poisson ratio topological layer are in a numerical interval formed by the values of a unit reentrant angle theta of the geometric topological unit of a head-end topological zone and a middle topological zone, the unit rib length ratio t/l of the geometric topological unit and the thickness h t of the negative poisson ratio topological layer.

Description

Isobaric expansion type stern bearing based on negative poisson ratio topological lining structure Technical Field The invention belongs to the technical field of bearing structure design and vibration control of ship propulsion systems, and relates to an isobaric expansion type stern bearing based on a negative poisson ratio topological lining structure. Background The traditional water lubrication stern bearing lining is mostly made of homogeneous elastomer materials such as rubber, polymer and the like. Under shafting load and water film pressure, such liners mainly exhibit radial compression deformation, but lack effective linkage between tangential deformation and radial stress. The single compression response mechanism makes it difficult to adapt to shaft unbalanced load and pressure gradient change, and is easy to cause local concentration of contact pressure, so that the problems of uneven water film thickness distribution, local water film rupture, aggravation of high-pressure area abrasion and the like are caused, and the problems become important factors for restricting the bearing load performance and the service life of the bearing. The prior researches mainly begin with material characteristics to improve the lining structure, such as reducing the elastic modulus to improve the flexibility, adopting zoned or gradient materials to relieve unbalanced load, or designing a micropore groove structure to optimize the water film formation. Although these methods can reduce the peak value of contact pressure and improve the lubrication effect, they still belong to the category of passive softening or local adjustment, and it is difficult to fundamentally change the stress deformation mechanism of the lining. Particularly when radially compressed, such homogeneous/quasi-homogeneous liners lack a controllable tangential deformation response, resulting in difficulty in achieving coordinated regulation of radial load, tangential deformation, and contact pressure. The negative poisson ratio structure can induce lateral expansion deformation orthogonal to the loading direction when being pressed by virtue of the unique geometric topological characteristic of the negative poisson ratio structure, and provides a brand new solution for a radial tangential cooperative response mechanism. When the negative poisson ratio effect of the structure is used as a bearing lining material, radial pressure can be accurately converted into controllable circumferential expansion, the shape of a contact interface between the shaft and the bearing lining is actively reconstructed, contact stress distribution is effectively optimized, and uniformity of a water film is improved. This feature makes it particularly advantageous in terms of relieving local stress concentrations, inhibiting edge contact effects, reducing frictional wear, etc. However, the existing exploration about the negative poisson ratio structure is mainly focused on the directions of honeycomb materials, lattice systems, periodic metamaterials and the like, and focuses on performance optimization such as equivalent elastic regulation, energy absorption, impact protection and the like. The research is mostly carried out under the conditions of free boundary or even load, and the special fluid lubrication environment, unbalanced load working condition, limited deformation boundary and the contact coupling effect of the shaft and the bearing lining of the ship stern bearing are not fully considered yet. In particular, there is a lack of systematic design methods for liner geometry constraints and service conditions. Disclosure of Invention The invention aims to provide a lining structure method based on negative poisson ratio topological design, which realizes tangential expansion behavior under radial compression through geometric topological design, so that the lining automatically homogenizes pressure distribution and expands contact areas when bearing is loaded, and combines a water film to form an isobaric expansion effect, thereby reducing edge high pressure and local film thickness collapse phenomenon and improving steady-state loading and noise reduction performance of the bearing. The technical scheme of the invention is as follows: An isobaric expansion type stern bearing based on a negative poisson ratio topological lining structure sequentially comprises a bearing shell, a negative poisson ratio topological layer and a lining matrix from outside to inside; The bearing shell is used for bearing and fixing a lining structure formed by a lining matrix and a negative poisson ratio topological layer, and is connected with the lining structure in a mechanical jogging or bonding mode, and is made of a metal material. The negative poisson ratio topological layer is formed by periodic geometric topological units, is arranged between the lining matrix and the bearing shell, and is connected with the lining matrix through a co-pouring mode or flexible glue, and