Evaluation method of impact resistance of multi-liner water-lubricated bearings based on fluid-structure coupling

Abstract

The present invention provides a method for evaluating the impact resistance of a multi-layer water-lubricated bearing based on fluid-solid coupling. The method comprises: constructing a geometric model of the multi-layer water-lubricated bearing and meshing the fluid domain and the solid domain; constructing an impact waveform function of the water-lubricated bearing to simulate the working environment of the water-lubricated bearing subjected to impact; importing the fluid domain mesh file into the fluid domain calculation model, and setting the water film boundary conditions and the impact load model in the fluid domain calculation model to obtain the water film pressure distribution; importing the water film pressure distribution, the solid domain mesh file, the material parameters, and the impact function into the solid domain calculation model to obtain the liner structure deformation and stress response data, and feeding the liner structure deformation back to the fluid domain calculation model, and iterating the two until the water film pressure distribution and the liner structure deformation converge; and analyzing the liner structure deformation and stress response data to obtain the impact resistance. The present invention improves the accuracy of the impact resistance evaluation.

Description

Technical Field

[0001] The present invention relates to the field of marine power machinery and bearing lubrication technology, and in particular to a method for evaluating the impact resistance of a multi-liner water-lubricated bearing based on fluid-solid coupling. Background Art

[0002] As the shipbuilding industry moves toward green and environmentally friendly development, water-lubricated bearings (WLBs) have become a crucial component of propulsion systems for large ships, submarines, and offshore platforms due to their advantages of no oil leakage, environmental friendliness, high reliability, and low maintenance costs. Existing single-layer water-lubricated bearings, when subjected to impact loads, suffer from poor lubrication film stability, low energy dissipation efficiency, and short fatigue life, making them unable to meet the demands of high-performance ship propulsion systems.

[0003] To improve the impact resistance of bearings, water-lubricated bearings with double-layer bushings have emerged. However, existing research has primarily focused on static or steady-state performance analysis, lacking systematic investigation of the dynamic response of fluid-solid coupling under impact loads. This has limited the optimization of impact resistance. Furthermore, existing models struggle to accurately simulate actual ship impact waveforms and their impact on bearing deformation and stress. In addition, they lack in-depth analysis of the combined effects of multiple factors, such as eccentricity, rotational speed, and material elastic modulus. This hinders material selection and the scientific optimization of operating parameters, necessitating an effective solution. Summary of the Invention

[0004] With the development of green tribology in the shipbuilding industry, water-lubricated bearings (WLBs) have been widely used in ship propulsion systems such as large ships, submarines, and offshore platforms due to their environmentally friendly, high reliability, and low maintenance costs. Compared with traditional oil-lubricated systems, water-lubricated bearings fundamentally solve the environmental pollution problem caused by oil leakage and are in line with the development needs of green ships. However, existing single-layer water-lubricated bearings still have significant defects under impact load conditions, including low energy dissipation efficiency, poor lubrication film stability, and short fatigue life, making it difficult to meet the stringent requirements of ship propulsion systems for high reliability and long life. Although double-layer bushing water-lubricated bearings have improved their impact resistance to a certain extent by optimizing the bushing material properties and providing a more effective solution for extreme impact conditions, there is a lack of systematic research on the dynamic response of fluid-solid coupling under impact loads. The model also struggles to accurately simulate the actual ship impact waveform and its impact on bearing deformation and stress, and lacks in-depth analysis.

[0005] Aiming at the defect of insufficient analysis of the impact resistance performance of double-layer liner water-lubricated bearings in the prior art, the present invention provides a method for evaluating the impact resistance performance of multi-layer liner water-lubricated bearings based on fluid-solid coupling.

[0006] The present invention provides a method for evaluating the impact resistance of a multi-liner water-lubricated bearing based on fluid-solid coupling, comprising:

[0007] Constructing a geometric model of a multi-liner water-lubricated bearing, meshing a fluid domain and a solid domain in the geometric model, and obtaining mesh files of the fluid domain and the solid domain;

[0008] Importing the mesh file of the fluid domain into the calculation model of the fluid domain, setting the water film boundary conditions and impact load model of the multi-layer water-lubricated bearing in the calculation model of the fluid domain, and obtaining the water film pressure distribution of the multi-layer water-lubricated bearing;

[0009] The impact load of the water-lubricated bearing under actual working conditions is mathematically abstracted to construct an impact waveform function model, and the model is applied as a boundary condition in the solid structure domain to realize simulation analysis of the bearing's impact response characteristics;

[0010] Importing the water film pressure distribution, the grid file of the solid domain, the material parameters, and the impact waveform function model into the computational model of the solid domain to obtain the bushing structure deformation and stress response data of the multi-layer water-lubricated bearing, and feeding back the bushing structure deformation to the computational model of the fluid domain to dynamically update the water film thickness and flow state, and iterating the loop until the water film pressure distribution and bushing structure deformation converge;

[0011] The impact resistance of the multi-layer water-lubricated bearing is obtained by analyzing the deformation and stress response data of the bushing structure of the multi-layer water-lubricated bearing.

[0012] According to a method for evaluating the impact resistance of a multi-liner water-lubricated bearing based on fluid-solid coupling provided by the present invention, meshing the fluid domain and the solid domain in the geometric model includes:

[0013] Meshing the fluid domain using a block partitioning method;

[0014] Finite element meshing is performed on the solid domain according to material properties of the solid domain.

[0015] According to a method for evaluating the impact resistance of a multi-liner water-lubricated bearing based on fluid-solid coupling provided by the present invention, the impact load model is an impact waveform function or measured ship impact data.

[0016] According to a method for evaluating the impact resistance of a multi-layer water-lubricated bearing based on fluid-solid coupling provided by the present invention, the material parameters of the solid domain include the elastic modulus and damping characteristics of the multi-layer liner, or a nonlinear elastic model is used.

[0017] According to a method for evaluating the impact resistance of a multi-liner water-lubricated bearing based on fluid-solid coupling provided by the present invention, the calculation model of the fluid domain is the Navier-Stokes equations, and the calculation model of the solid domain is the elastic dynamics equations.

[0018] According to a method for evaluating the impact resistance of a multi-liner water-lubricated bearing based on fluid-solid coupling provided by the present invention, the fluid domain and the solid domain have the following relationship:

[0019]

[0020] in, For fluid, It is solid; is the fluid stress tensor, in units of ; is the solid stress tensor, in units of ; is the unit normal vector of the fluid interface; is the unit normal vector of the solid interface; is the displacement vector of the fluid, in units of ; is the displacement vector of the solid, in units of .

[0021] According to a method for evaluating the impact resistance of a multi-liner water-lubricated bearing based on fluid-structure coupling provided by the present invention, the bushing structure deformation is fed back to a calculation model of the fluid domain, comprising:

[0022] According to the bushing structure deformation and bearing displacement, the mesh file of the fluid domain is updated in real time using dynamic mesh technology;

[0023] The updated grid file of the fluid domain is fed back to the computational model of the fluid domain.

[0024] According to a method for evaluating the impact resistance of a multi-liner water-lubricated bearing based on fluid-solid coupling provided by the present invention, the bearing displacement is determined by the following formula:

[0025]

[0026] in, represents the thickness of the liquid film, is the journal radius, Bearing bushing radius, is the axis deviation angle, is the shaft eccentricity.

[0027] According to the present invention, a method for evaluating the impact resistance of a multi-liner water-lubricated bearing based on fluid-solid coupling further includes:

[0028] Using one or more of the eccentricity, rotational speed, and lining material elastic modulus as variables, multi-operating condition simulations are performed to obtain lining structural deformation and stress response data for the multi-lining water-lubricated bearing under different operating conditions. The impact resistance evaluation method for multi-lining water-lubricated bearings based on fluid-structure coupling provided by the present invention has the following technical effects:

[0029] This invention, by employing a method based on fluid-solid coupling to determine the impact resistance of multi-liner water-lubricated bearings, effectively addresses the existing lack of accurate simulation of the dynamic response of bearing fluid-solid coupling under complex impact loads. Compared to conventional solutions that only consider static or steady-state analysis, this invention can realistically reproduce extreme impact conditions in ship propulsion systems, improving the accuracy and reliability of dynamic response predictions.

[0030] By introducing a dynamic load model based on a standard shock waveform, this method achieves a scientific simulation of actual ship impact load characteristics, ensuring computational authenticity and engineering applicability. The combination of structured hexahedral meshing and dynamic meshing significantly improves computational stability and convergence speed in both fluid and solid domains, ensuring efficient and accurate solution processing.

[0031] Furthermore, through parametric scanning of key parameters such as eccentricity, rotational speed, and bushing material elastic modulus, this invention systematically reveals the influence of multiple factors on bearing deformation and stress distribution, providing a scientific basis for bushing material selection and operating parameter optimization. Compared with existing technologies, this invention significantly improves the impact resistance and service life of double-layer bushing water-lubricated bearings, enhances the overall reliability and environmental friendliness of ship propulsion systems, and has significant economic and social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0033] Figure 1 This is one of the flow charts of the method for evaluating the impact resistance of a multi-liner water-lubricated bearing based on fluid-solid coupling provided by the present invention;

[0034] Figure 2 It is a structural schematic diagram of a double-layer water-lubricated bearing in the method for evaluating the impact resistance of a multi-layer water-lubricated bearing based on fluid-solid coupling provided by the present invention;

[0035] Figure 3It is a structural schematic diagram of a bearing lubrication model in the method for evaluating the impact resistance of a multi-liner water-lubricated bearing based on fluid-solid coupling provided by the present invention;

[0036] Figure 4 Schematic diagram of the grid of the bearing lubrication model in the method for evaluating the impact resistance of a multi-liner water-lubricated bearing based on fluid-solid coupling provided by the present invention;

[0037] Figure 5 This is the second flow chart of the method for evaluating the impact resistance of a multi-liner water-lubricated bearing based on fluid-solid coupling provided by the present invention;

[0038] Figure 6 Schematic diagram of shock waves in the method for evaluating the impact resistance of multi-liner water-lubricated bearings based on fluid-solid coupling provided by the present invention;

[0039] Figure 7 A schematic diagram showing the changes in water film pressure, lining stress, and lining deformation over time when the bearing is subjected to impact in the method for evaluating the impact resistance of a multi-lining water-lubricated bearing based on fluid-solid coupling provided by the present invention;

[0040] Figure 8 A schematic diagram showing how the impact response varies with eccentricity in the method for evaluating the impact resistance of a multi-liner water-lubricated bearing based on fluid-solid coupling provided by the present invention;

[0041] Figure 9 This is a schematic diagram comparing the impact resistance of different materials in the impact resistance evaluation method for multi-liner water-lubricated bearings based on fluid-solid coupling provided by the present invention. DETAILED DESCRIPTION

[0042] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0043] In view of the shortcomings of the prior art in the analysis of the impact resistance of double-layer bushing water-lubricated bearings, the present invention aims to solve the following technical problems:

[0044] 1. Accurately simulate the dynamic response behavior of bearing fluid-structure interaction under extreme impact loads in ship propulsion systems, improving solution accuracy and simulation authenticity;

[0045] 2. Systematically reveal the influence of key parameters such as eccentricity, speed and bushing material elastic modulus on bearing deformation and stress distribution;

[0046] 3. Provide multi-factor coupling analysis methods to guide bushing material selection and operating parameter optimization, thereby improving bearing impact resistance, stability and service life;

[0047] 4. Realize simulation load input based on dynamic impact waveform to ensure stable convergence and computational efficiency of the simulation process, as well as long-term reliable operation under extreme working conditions.

[0048] The key innovations of the present invention are:

[0049] The fluid-structure coupling dynamic simulation model based on the standard impact waveform function realistically simulates the working environment of water-lubricated bearings under complex impact loads in ship propulsion systems, improving solution accuracy.

[0050] The elastic dynamic characteristics of the multi-layer material structure are combined with the fluid dynamics solution to achieve a coordinated analysis of material properties and fluid lubrication state, revealing the influence mechanism of the material elastic modulus on the impact resistance performance.

[0051] The parametric scanning method systematically analyzes the impact of operating parameters on bearing performance, providing a scientific basis for bushing material selection and operating condition optimization, effectively improving bearing stability and service life.

[0052] The present invention discloses a method for solving the impact resistance of multi-layer water-lubricated bearings based on fluid-solid coupling, which effectively overcomes the problems of insufficient simulation of the dynamic response of impact loads and lack of coupling analysis of materials and operating parameters in the prior art. By constructing a fluid domain and solid domain coupling model containing an impact waveform function, combined with multiple iterative calculations to achieve dynamic interaction between water film flow and bushing structure deformation, the deformation and stress distribution of the bearing under complex working conditions are accurately predicted. This method uses parametric analysis to analyze the influence of eccentricity, rotational speed and bushing material elastic modulus on bearing performance, which improves the scientificity and reliability of impact resistance evaluation. At the same time, the use of structured grid division and fluid-solid coupling numerical solution strategy ensures calculation accuracy and stability, providing solid technical support for the design and optimization of double-layer bushing water-lubricated bearings.

[0053] The following combination Figure 1 The present invention describes a method for evaluating the impact resistance of a multi-liner water-lubricated bearing based on fluid-solid coupling, comprising:

[0054] Step 101: construct a geometric model of a multi-liner water-lubricated bearing, mesh the fluid domain (water film) and solid domain (liner structure) in the geometric model, and obtain mesh files of the fluid domain and solid domain;

[0055] According to the double-layer bushing WLB (such as Figure 2 The actual structural dimensions are shown in the figure. The three-dimensional geometric model is established using the gambit software. The specific parameters are as follows Figure 3As shown, the fluid domain (water film) and solid domain (lining material structure) are divided into grids (such as Figure 4 A fine structured grid is used in the fluid domain to ensure calculation accuracy; the grid density in the solid domain is set according to the elastic properties of the material.

[0056] Step 102: constructing an impact waveform function model of a water-lubricated bearing to simulate the impact conditions of the water-lubricated bearing during actual operation;

[0057] Step 103: importing the mesh file of the fluid domain into the calculation model of the fluid domain, setting the water film boundary conditions and impact load model of the multi-layer water-lubricated bearing in the calculation model of the fluid domain, applying an impact to the bearing, and obtaining the water film pressure distribution of the multi-layer water-lubricated bearing;

[0058] Start the fluid-solid coupling calculation iteration, calculate the water film pressure distribution in the fluid domain, solve the elastic dynamics equation of the solid domain under the action of the fluid domain pressure, calculate the bushing structure deformation, update the deformation feedback to the fluid domain, and iterate until the pressure and deformation converge.

[0059] Step 104: Importing the water film pressure distribution, the grid file of the solid domain, the material parameters, and the impact waveform function model into the computational model of the solid domain to obtain the bushing structure deformation and stress response data of the multi-layer water-lubricated bearing, and feeding back the bushing structure deformation to the computational model of the fluid domain to dynamically update the water film thickness and flow state, and iterating the loop until the water film pressure distribution and bushing structure deformation converge;

[0060] During the iteration process, the convergence state is determined by writing macro files to monitor key parameters such as water film pressure, structural stress, and deformation. The convergence threshold is determined by the stability of pressure and deformation changes. Optionally, the convergence judgment is based on the change rate of water film pressure and bushing deformation being less than a preset threshold to ensure the reliability of the results. A bidirectional coupling iterative algorithm is used to realize fluid-solid data exchange to ensure the stable convergence of the calculation process. The complete flowchart is shown below. Figure 5 shown.

[0061] Step 105 : Analyze the bushing structure deformation and stress response data of the multi-liner water-lubricated bearing to obtain the impact resistance of the multi-liner water-lubricated bearing.

[0062] The smaller the bushing structure deformation and stress response data are, the stronger the impact resistance is. This embodiment does not limit the specific method for judging the impact resistance.

[0063] This embodiment constructs a coupling model of fluid domain and solid domain including an impact load model, and combines multiple iterative calculations to realize the dynamic interaction between water film flow and bushing structure deformation. The pressure distribution calculated in the fluid domain is transmitted to the solid domain, and the deformation calculated in the solid domain is fed back to the fluid domain. The water film thickness and flow state are dynamically updated. Through multiple iterations until the pressure and deformation converge, a stable dynamic response result is obtained, and the deformation and stress distribution of the bearing under complex working conditions are accurately predicted, thereby improving the accuracy of the impact resistance evaluation of multi-layer water-lubricated bearings.

[0064] Based on the above embodiment, in this embodiment, meshing of the fluid domain and the solid domain in the geometric model is performed, including:

[0065] Meshing the fluid domain using a block partitioning method;

[0066] Finite element meshing is performed on the solid domain according to material properties of the solid domain.

[0067] The fluid domain is structured and meshed, and the block division method is used to ensure the quality of the water film mesh and generate high-quality fluid calculation mesh files; at the same time, the solid domain is finite element meshed according to the material properties.

[0068] The structured hexahedral grid combined with the model block division method can be used to improve the calculation accuracy and stability.

[0069] On the basis of the above embodiment, the impact load model in this embodiment is an impact waveform function or measured ship impact data.

[0070] The impact load conditions or ship-related impact resistance standards experienced by water-lubricated bearings during actual operation are mathematically abstracted to form an impact load function model, which is then loaded into the solid structure calculation domain.

[0071] Figure Figure 6 As shown, the formula of the shock waveform function is as follows:

[0072]

[0073] in, 、 is the peak value of acceleration, in units of ; is the maximum acceleration, in units of ; 、 、 、 、 is the time, the unit is ; is the speed, the unit is ; is the maximum speed, in units of ; is the displacement, the unit is .

[0074] On the basis of the above embodiment, in this embodiment, solid domain material parameters are set, and the solid domain material parameters include the elastic modulus and damping characteristics of the multi-layer bushing, and are introduced into the solid finite element solution environment.

[0075] The bushing material can be selected from composite materials with different elastic moduli and damping characteristics according to the actual application to reflect the actual performance of multi-layer lining materials. Alternatively, a nonlinear elastic model can be used to further improve the accuracy of the simulation.

[0076] On the basis of the above embodiment, in this embodiment, the calculation model of the fluid domain is the Navier-Stokes equations, and the calculation model of the solid domain is the elastic dynamics equations.

[0077] Turbulence models (such as k-ε and LES) can be used in the fluid domain to enhance the solution accuracy; plastic deformation analysis can be introduced in the solid domain to consider the inelastic behavior of the material under extreme impact.

[0078] Based on the above embodiment, the fluid domain and the solid domain in this embodiment have the following relationship:

[0079]

[0080] in, For fluid, It is solid; is the fluid stress tensor, in units of ; is the solid stress tensor, in units of ; is the unit normal vector of the fluid interface; is the unit normal vector of the solid interface; is the displacement vector of the fluid, in units of ; is the displacement vector of the solid, in units of .

[0081] Based on the above embodiment, in this embodiment, the bushing structure deformation is fed back to the calculation model of the fluid domain, including:

[0082] According to the bushing structure deformation and bearing displacement, the mesh file of the fluid domain is updated in real time using dynamic mesh technology;

[0083] The updated grid file of the fluid domain is fed back to the computational model of the fluid domain.

[0084] Based on the above embodiment, the bearing displacement is determined by the following formula in this embodiment:

[0085]

[0086] in, represents the thickness of the liquid film, is the journal radius, Bearing bushing radius, is the axis deviation angle, is the shaft eccentricity.

[0087] Based on the above embodiments, this embodiment also includes:

[0088] Using one or more of the following variables—eccentricity, rotational speed, and bushing material elastic modulus—multi-operating-condition simulations were conducted to obtain data on the bushing structural deformation and stress response of the multi-liner water-lubricated bearing under different operating conditions. The parameter range covered typical operating conditions found in actual ship operations, ensuring the representativeness and practicality of the simulation results.

[0089] Process and analyze simulation data to evaluate the impact of different parameter combinations on the bearing's impact resistance. Analyze the impact of these variables on the bearing's maximum deformation and peak stress. Statistically extract key performance indicators to provide a basis for design optimization.

[0090] Output time domain dynamic response results and impact resistance evaluation report to provide a basis for the design and operation optimization of double-layer bushing water-lubricated bearings.

[0091] Figure 7 The impact water film pressure, lining stress and lining deformation of the bearing change with time. Figure 8 is the shock response changing with eccentricity. Figure 9 Comparison of impact resistance of different materials.

[0092] The proposed method realistically reproduces the operating conditions of water-lubricated bearings in complex shock environments in ship propulsion systems through dynamic simulation of fluid-structure coupling based on standard shock waveforms, significantly improving the simulation accuracy and computational stability of the dynamic response to shock loads. The use of structured grid and dynamic grid technology ensures computational accuracy and efficiency. Parametric scanning analyzes the impact of key factors on performance, effectively guiding material selection and operating parameter optimization, significantly improving bearing stability and service life. Compared with existing technologies, this method significantly improves the impact resistance of bearings under shock conditions, enhancing the reliability of ship propulsion systems.

[0093] In summary, the present invention discloses a method for solving the impact resistance of multi-layer water-lubricated bearings based on fluid-solid coupling, which effectively solves the problem of insufficient simulation of fluid-solid interaction under complex impact loads in the prior art and improves the accuracy and stability of the calculation. Taking into account the complex characteristics of the double-layer bushing structure and the thin layer of water film, this method adopts a division method that combines structured hexahedral grids with model blocks, which significantly improves the quality of fluid and solid calculation grids and ensures calculation accuracy. By establishing a dynamic load model based on a standard impact waveform and realizing fluid-solid coupling iterative solution, the pressure field and structural deformation response during the calculation process are effectively monitored and controlled, and the convergence is accurately judged. The bushing deformation feedback adopts a strategy that combines the start-up grid technology with the node displacement adjustment macro, which greatly reduces the grid deformation and ensures the grid quality and calculation efficiency. This method not only realizes the dynamic response prediction of double-layer bushing water-lubricated bearings under multiple working conditions, but also provides solid technical support for the optimization design of impact resistance, significantly improving the reliability and service life of the ship propulsion system.

[0094] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A method for evaluating the impact resistance of multi-liner water-lubricated bearings based on fluid-solid coupling, characterized in that: include: Constructing a geometric model of a multi-liner water-lubricated bearing, meshing a fluid domain and a solid domain in the geometric model, and obtaining mesh files of the fluid domain and the solid domain; Construct an impact waveform function model for water-lubricated bearings to simulate the impact conditions of water-lubricated bearings during actual operation; Importing the mesh file of the fluid domain into the calculation model of the fluid domain, setting the water film boundary conditions and impact load model of the multi-layer water-lubricated bearing in the calculation model of the fluid domain, and obtaining the water film pressure distribution of the multi-layer water-lubricated bearing; Importing the water film pressure distribution, the grid file of the solid domain, the material parameters, and the impact waveform function model into the computational model of the solid domain to obtain the bushing structure deformation and stress response data of the multi-layer water-lubricated bearing, and feeding back the bushing structure deformation to the computational model of the fluid domain to dynamically update the water film thickness and flow state, and iterating the loop until the water film pressure distribution and bushing structure deformation converge; The impact resistance of the multi-layer water-lubricated bearing is obtained by analyzing the deformation and stress response data of the bushing structure of the multi-layer water-lubricated bearing.

2. The method for evaluating the impact resistance of multi-layer water-lubricated bearings based on fluid-solid coupling according to claim 1 is characterized in that: Meshing the fluid and solid domains in the geometric model includes: Meshing the fluid domain using a block partitioning method; Finite element meshing is performed on the solid domain according to material properties of the solid domain.

3. The method for evaluating the impact resistance of multi-layer water-lubricated bearings based on fluid-solid coupling according to claim 1 is characterized in that: The impact load model is the impact waveform function or the measured ship impact data.

4. The method for evaluating the impact resistance of multi-layer water-lubricated bearings based on fluid-solid coupling according to claim 1 is characterized in that: The material parameters of the solid domain include the elastic modulus and damping characteristics of the multi-layer bushing, or a nonlinear elastic model is used.

5. The method for evaluating the impact resistance of multi-liner water-lubricated bearings based on fluid-solid coupling according to claim 1 is characterized in that: The calculation model of the fluid domain is the Navier-Stokes equations, and the calculation model of the solid domain is the elastic dynamics equations.

6. The method for evaluating the impact resistance of multi-liner water-lubricated bearings based on fluid-solid coupling according to claim 1 is characterized in that: The fluid domain and the solid domain have the following relationship: ; in, For fluid, It is solid; is the fluid stress tensor, in units of ; is the solid stress tensor, in units of ; is the unit normal vector of the fluid interface; is the unit normal vector of the solid interface; is the displacement vector of the fluid, in units of ; is the displacement vector of the solid, in units of .

7. The method for evaluating the impact resistance of multi-layer water-lubricated bearings based on fluid-solid coupling according to claim 1 is characterized in that: Feeding back the bushing structure deformation to the computational model of the fluid domain, including: According to the bushing structure deformation and bearing displacement, the mesh file of the fluid domain is updated in real time using dynamic mesh technology; The updated grid file of the fluid domain is fed back to the computational model of the fluid domain.

8. The method for evaluating the impact resistance of multi-liner water-lubricated bearings based on fluid-solid coupling according to claim 7 is characterized in that: The bearing displacement is determined by the following formula: ; in, represents the thickness of the liquid film, is the journal radius, Bearing bushing radius, is the axis deviation angle, is the shaft eccentricity.

9. The method for evaluating the impact resistance of a multi-liner water-lubricated bearing based on fluid-solid coupling according to any one of claims 1 to 8, characterized in that: Also includes: Taking one or more of the eccentricity, rotational speed, and elastic modulus of the bushing material as variables, multi-operating condition simulation is carried out to obtain the bushing structure deformation and stress response data of the multi-lining water-lubricated bearing under different operating conditions.

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