CN109214128B - Wet friction pair sliding friction process lubrication flow field distribution characteristic modeling method - Google Patents
Wet friction pair sliding friction process lubrication flow field distribution characteristic modeling method Download PDFInfo
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Abstract
The invention relates to a method for modeling distribution characteristics of a lubricating flow field in a wet friction pair sliding friction process, which comprises the following steps: establishing a wet friction pair solid model and a lubrication flow field model; arranging an assembly body; grid division; setting an analysis step and a field output; applying boundary conditions for the wet friction pair solid model and the lubrication flow field model; setting the mutual coupling action between the wet friction pair solid model and the lubrication flow field solid model; analyzing the flow field characteristics: analyzing the flow velocity and pressure field of the lubricating flow field; according to the simulation result of the lubricating flow field of the wet friction pair, the flow velocity distribution cloud chart and the pressure distribution cloud chart of the lubricating flow field have a corresponding relationship, and the lubricating flow field has a small influence effect on the wet friction pair; the flow velocity of the wet friction pair lubrication flow field is consistent with the pressure change trend at the same moment under the same lubrication oil pressure condition. The invention can analyze the flow field characteristics of the lubrication flow field under different working conditions and the influence of the lubrication flow field on the stress strain field of the wet friction pair.
Description
Technical Field
The invention relates to the field of research on flow field distribution characteristics among rotating friction pairs, in particular to a modeling method for the distribution characteristics of a lubricating flow field in a sliding friction process of a wet friction pair.
Background
The wet friction pair is widely applied to transmission parts such as wet clutches, wet brakes, fluid viscosity speed regulation clutches and the like, the wet friction pair is a friction pair with oil liquid cooling and lubricating on the surface of the friction pair, and compared with a dry friction pair, the wet friction pair has the advantages of small abrasion, long service life, simplicity in control, stability in combination, large torque capacity, stable performance, low noise and the like. With the rapid development of the automobile industry and the progress of science and technology, civil light automobiles are developed towards the directions of operation comfort, driving safety, fuel economy and the like, and heavy military vehicles are developed towards high compactness, high reliability and high power. Wet clutches, which are core components of transmissions, have been widely used in integrated transmissions because of their advantages and their own characteristics, which have complied with the direction of development of vehicles. The comprehensive transmission device determines the maneuvering performance of the whole vehicle, and particularly in the field of heavy military vehicles, the comprehensive transmission device has high requirements on the reliability and the durability.
The advantages and disadvantages of the wet friction pair directly affect the working efficiency, the service life and other aspects of the transmission device, the CFD (computational fluid dynamics) technology is adopted to analyze and research the distribution characteristics of the lubricating flow field of the wet friction pair, the analysis of the flow field influence factors is realized through numerical simulation calculation, the change of the flow field and the lubricating problem possibly occurring in the friction process can be predicted in advance, the uncertainty caused by the improper design of the lubricating flow and the lubricating pressure can be effectively overcome, the design efficiency is obviously improved, and the economic loss is reduced.
At present, most scholars at home and abroad adopt a numerical simulation method to research the flow field characteristics of a lubrication flow field, such as a speed field, a temperature field and a pressure field, generally apply commercial modeling software, preprocessing software and FLUENT software to jointly simulate and simulate rotating fluid, whether a grid can be accurately generated is an important problem when numerical simulation is carried out, and the method occupies a very important position when physical boundary conditions are reasonably and properly applied according to the actual working condition of a wet friction pair. At present, a wet friction pair lubrication flow field has no case of simulation calculation in ABAQUS software, and is mostly based on simulation of other commercial software, so that a method for simulation modeling of the wet friction pair lubrication flow field in the ABAQUS software is urgently needed to be provided, complex engineering problems such as fluid-solid coupling heat transfer and the like of the wet friction pair lubrication flow field are calculated by applying a strong nonlinear calculation function of the method, and further the problems existing in the actual work of the wet friction pair are guided to be solved, the structural design of the wet friction pair is optimized, and the like.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a method for modeling distribution characteristics of a lubrication flow field in a wet friction pair sliding friction process, which can overcome limitations of an existing lubrication flow field characteristic simulation method, analyze flow field characteristics of the lubrication flow field under different working conditions, and analyze influences of the lubrication flow field on a wet friction pair stress strain field under different working conditions.
In order to realize the purpose, the invention adopts the following technical scheme: a method for modeling lubricating flow field distribution characteristics in a wet friction pair sliding friction process comprises the following steps: 1) Establishing a wet friction pair solid model and a lubrication flow field model; 2) An assembly body is arranged: respectively selecting respective parts for assembling the wet friction pair solid model and the lubrication flow field solid model; 3) Grid division: before grid division, virtual surface cutting is respectively carried out on a wet friction pair solid model and a lubrication flow field solid model along the same cutting surface, regular grids are drawn, the same number of seeds are arranged at the contact edges of the two models, and the good data exchange is carried out in the coupling calculation process of the two models through the same cutting surface and the same number of seeds of the contact surface; 4) Setting analysis step and field output: firstly, specifying the type of an analysis step, selecting a Flow analysis step type, wherein a lubrication Flow field model is a CFD type; performing Explicit Dynamic analysis on the wet friction pair, so that a Dynamic analysis step type and an Explicit analysis step type are selected, and the two models are set to have the same analysis step time for performing coupling calculation; 5) Applying boundary conditions for the wet friction pair solid model and the lubrication flow field model; 6) Setting the mutual coupling action between the wet friction pair solid model and the lubrication flow field solid model; 7) Analyzing the flow field characteristics: analyzing the flow velocity and the pressure field of a lubricating flow field; 8) According to the simulation result of the wet friction pair lubricating flow field, the flow velocity distribution cloud chart and the pressure distribution cloud chart of the lubricating oil flow field have a corresponding relation, the flow velocity of oil liquid at the oil outlet of the oil groove is larger, the pressure is smaller, the flow velocity of the oil liquid in the oil groove of the inner ring is smaller, the pressure is larger, the flow velocity and the pressure distribution of the flow field have increasing trends of different degrees along with the increase of time, and the phenomenon of obvious uneven distribution exists; the lubricating flow field has a small influence on the wet friction pair; the flow velocity and the pressure of the wet friction pair lubrication flow field are increased along with the increase of the rotating speed of the wet friction pair at the same moment under the same lubrication oil pressure condition, and the change trends are consistent.
Further, in the step 1), a simplified physical model of the wet friction pair with four radial oil grooves is established according to the actual size of the inner diameter and the outer diameter of the wet friction pair, the model is standard & explicit, the wet friction pair is drawn into a whole, imaginary plane cutting is performed along the contact surface of the friction plate and the steel sheet, and then the oil grooves of the friction pair are drawn according to the size of the oil grooves of the wet friction pair model.
Further, in the step 1), a lubricating flow field model with a model type of CFD is drawn according to the size of the oil groove of the wet friction pair model, and material properties of the lubricating flow field model are set according to physical properties of lubricating oil.
Further, in the step 4), a field output variable is selected according to the calculated amount to be obtained by the model calculation, the calculated amount of the flow field flow velocity and the flow field pressure is required to be obtained for the lubrication flow field, and the stress strain variation of the wet friction pair is concerned.
Further, in the step 5), the boundary conditions of the lubrication flow field solid model include an inlet oil pressure and an outlet oil pressure, the boundary conditions of the wet friction pair solid model include degrees of freedom in six directions, the displacement of the back surface of the friction plate in the x, y and z directions is set to be zero, the rotation around the x axis and the y axis is set to be zero, and the rotation speed of the wet friction pair around the z axis is 700r/min, which is about 72.8rad/s.
Further, in the step 6), setting the mutual coupling action between the wet friction pair solid model and the lubrication flow field solid model: the method comprises the steps of respectively setting interaction surfaces in respective model areas, selecting surfaces in mutual contact, setting the interaction type to be Fluid-structured Co-simulation, carrying out real-time data exchange between a solid domain and a Fluid domain, driving lubricating oil between friction pair pieces to rotate by a friction pair in the sliding process of a wet friction pair, and meanwhile, enabling the lubricating oil to have a certain reaction effect on the friction pair and enabling the wet friction pair and the lubricating oil to interact in the sliding process.
Further, in the step 7), analyzing flow field characteristics: and setting corresponding lubricating oil inlet oil pressure and the rotating speed of the wet friction pair at the boundary condition of the model according to the actual working condition of the wet friction pair, and further analyzing the flow speed and pressure change conditions of the lubricating flow field of the wet friction pair under different working conditions.
Due to the adoption of the technical scheme, the invention has the following advantages: 1. the model established by the invention is a fluid-solid coupling model, namely a mutual coupling action model of the wet friction pair and the lubricating flow field, and can analyze the flow field characteristics of the lubricating flow field under different working conditions and the influence of the lubricating flow field on the stress strain field of the wet friction pair under different working conditions. 2. The method is based on finite element software ABAQUS with good nonlinear computing capability, three-dimensional numerical modeling is carried out on the lubrication flow field between the wet friction pair and the wet friction pair, the characteristics and the influence factors of the lubrication flow field are analyzed, and the influence of the lubrication flow field on the stress strain field of the wet friction pair is analyzed through the fluid-solid coupling effect. 3. The method is based on a wet friction pair fluid-solid coupling model established by an ABAQUS software fluid-solid coupling module, the wet friction pair is subjected to parametric modeling, a structured grid division technology is adopted to draw hexahedral grids, a lubrication flow field between the wet friction pair is subjected to three-dimensional modeling, the boundary conditions of a wet friction pair model lubrication flow field model are reasonably set according to the actual working condition of the wet friction pair, a numerical simulation result is obtained, the characteristics of the lubrication flow field and the influence factors of the lubrication flow field are analyzed, and the influence of the lubrication flow field on a wet friction pair stress strain field is analyzed. 4. The invention overcomes the limitation of the existing lubricating flow field characteristic simulation method, and further replaces the application of the rotating boundary condition of the flow field in the common flow field simulation through the mutual coupling effect of the wet friction pair and the lubricating flow field, and simultaneously reasonably sets other boundary conditions of the model according to the actual working condition of the wet friction pair, thereby obtaining a practical numerical simulation result, analyzing the lubricating flow field characteristic and the influence factor of the lubricating flow field in the wet friction pair, and analyzing the influence effect of the lubricating flow field on the wet friction pair.
Drawings
FIG. 1 is a three-dimensional solid model of a wet friction pair having four radial oil grooves;
FIG. 2 is a model of a flow field of lubricating oil between wet friction pair plates;
FIG. 3 is a mesh partitioning of a wet friction pair solid model;
FIG. 4 is a mesh division of a lubricating oil flow field between wet friction sub-plates;
FIG. 5 is a loading diagram of basic boundary conditions of a physical model of a wet friction pair constrained by coupling of the back surface of a friction plate;
FIG. 6 is a loading diagram of the basic boundary of the lubricating oil flow field between the wet friction pair plates;
FIG. 7 is a schematic view of a coupling contact surface between a wet friction pair solid model and a lubricating oil flow field;
FIG. 8 is a schematic view of a coupling contact surface of a lubricating oil flow field and a wet friction pair;
FIG. 9a is a flow field velocity vector diagram of the lubricating oil at 0.06 s;
FIG. 9b is a flow velocity vector diagram of the lubricating oil flow field at 0.08 s;
FIG. 9c is a flow field velocity vector diagram of the lubricating oil at 0.1 s;
FIG. 9d is a flow field velocity vector diagram of the lubricating oil at 0.12 s;
FIG. 10a is a cloud of flow velocity of the lubricating oil flow field at 0.06 s;
FIG. 10b is a cloud of flow velocities of the lubricating oil flow field at 0.08 s;
FIG. 10c is a cloud of flow velocity of the lubricating oil flow field at 0.1 s;
FIG. 10d is a cloud of flow velocity of the lubricant flow field at 0.12 s;
FIG. 11a is a plot of lubricant flow field pressure at 0.06 s;
FIG. 11b is a plot of lubricant flow field pressure at 0.08 s;
FIG. 11c is a plot of the lubricating oil flow field pressure at 0.1 s;
FIG. 11d is a plot of lubricant flow field pressure at 0.12 s;
FIG. 12a is a stress diagram of a friction plate of a wet friction pair at 0.06 s;
FIG. 12b is a stress diagram of a wet friction pair friction plate at 0.08 s;
FIG. 12c is a stress diagram of the friction plate of the wet friction pair at 0.1 s;
FIG. 12d is a stress diagram of the friction plate of the wet friction pair at 0.12 s;
FIG. 13a is a stress diagram of a wet friction pair steel sheet at 0.06 s;
FIG. 13b is a graph of wet friction pair steel sheet stress at 0.08 s;
FIG. 13c is a graph of wet friction pair steel sheet stress at 0.1 s;
FIG. 13d is a stress diagram of the wet friction pair steel plate at 0.12 s;
FIG. 14a is a cloud chart of the distribution of flow velocity of a lubrication flow field under the working conditions that the oil pressure at the inlet of a wet friction pair is 500Pa, the rotating speed is 500rpm respectively;
FIG. 14b is a cloud chart of the distribution of flow rates of the lubrication flow fields under the conditions that the oil pressure at the inlet of the wet friction pair is 500Pa, the rotating speed is 700rpm respectively;
FIG. 14c is a cloud chart of the distribution of flow velocity of the lubrication flow field under the conditions that the oil pressure at the inlet of the wet friction pair is 500Pa, the rotating speed is 1000rpm respectively;
FIG. 14d is a cloud chart of the distribution of flow velocities of the lubrication flow field under the conditions that the oil pressure at the inlet of the wet friction pair is 500Pa, the rotating speed is 1200rpm respectively;
FIG. 15a is a cloud of pressure distribution of a lubrication flow field under the working conditions that the oil pressure at the inlet of the wet friction pair is 500Pa, the rotating speed is 500rpm respectively;
FIG. 15b is a cloud chart of pressure distribution of a lubrication flow field under the working conditions that the oil pressure at the inlet of the wet friction pair is 500Pa, the rotating speed is 700rpm respectively;
FIG. 15c is a cloud of pressure distribution of a lubrication flow field under the conditions that the oil pressure at the inlet of the wet friction pair is 500Pa, the rotating speed is 1000rpm respectively;
FIG. 15d is a cloud of pressure distributions of the lubrication flow field under conditions of 500Pa of wet friction pair inlet oil pressure and 1200rpm of rotation speed.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
The invention provides a wet friction pair sliding friction process lubrication flow field distribution characteristic modeling method, which is based on an ABAQUS software platform and mainly comprises the steps of drawing a model part, setting material attributes of the part, assembling the part, dividing a grid, setting an analysis step, setting model interaction, applying load and setting boundary conditions, submitting calculation and post-processing, and specifically comprises the following steps:
1) Establishing a wet friction pair solid model and a lubrication flow field model:
establishing a simplified wet friction pair solid model with four radial oil grooves according to the actual size of the inner diameter and the outer diameter of a wet friction pair, wherein the model type is standard & explicit, drawing the wet friction pair into a whole, performing imaginary surface cutting along the contact surface of a friction plate and a steel sheet so as to set the material properties of the friction plate and the steel sheet respectively in the following process, and drawing a friction pair oil groove according to the size of the wet friction pair model oil groove;
and drawing a lubricating flow field model with the model type being CFD according to the size of the oil groove of the wet friction pair model, and setting the material attribute of the lubricating flow field model according to the physical property of the lubricating oil.
As shown in fig. 1 and 2, the physical model of the wet friction pair and the physical model of the lubrication flow field are schematic diagrams. The wet friction pair solid model is composed of a friction plate and a steel sheet, the type of the wet friction pair solid model is Deformable, and a lubrication flow field model is established in the CFD module.
2) An assembly body is arranged: because the wet friction pair solid model and the lubrication flow field solid model are respectively provided with only one part, the parts are respectively selected for assembly.
3) Grid division:
before grid division, virtual surface cutting is respectively carried out on a wet friction pair solid model and a lubrication flow field solid model along the same cutting surface so as to accurately arrange grid seeds and draw a regular grid, the same number of seeds are arranged at the contact edges of the two models, and the same cutting surface and the same number of seeds of the contact surface ensure that good data exchange is carried out in the coupling calculation process of the two models;
as shown in fig. 3 and 4, for mesh division of the wet friction pair solid model and the lubrication flow field solid model, the wet friction pair solid model is of a hexahedral structured mesh C3D8R type, and the lubrication flow field model is of a tetrahedral free mesh FC3D4 type.
4) Setting analysis step and field output:
setting an analysis step to describe the process of model loading change, firstly, specifying the type of the analysis step, selecting a Flow analysis step type, wherein a lubrication Flow field model is a CFD type; performing Explicit Dynamic analysis on the wet friction pair, so that a Dynamic analysis step type and an Explicit analysis step type are selected, and the two models are set to have the same analysis step time for performing coupling calculation;
and selecting a field output variable according to the calculated quantity to be obtained by model calculation, mainly obtaining calculated quantities such as flow field flow velocity, flow field pressure and the like for a lubrication flow field, and mainly paying attention to the variable quantities such as stress strain and the like for a wet friction pair so as to analyze a simulation calculation result subsequently.
5) Applying a boundary condition:
boundary conditions of the lubrication flow field solid model comprise inlet oil pressure and outlet oil pressure, boundary conditions of the wet friction pair solid model comprise degrees of freedom in six directions, displacement of the back of the friction plate in x, y and z directions is set to be zero, rotation around the x axis and the y axis is set to be zero, and the rotating speed of the wet friction pair around the z axis is 700r/min and is about 72.8rad/s.
Specifically, as shown in fig. 5 and 6, for applying basic boundary conditions of a physical model and a lubrication flow field model of the wet friction pair, the back surface of the friction plate is coupled with a central reference point of the friction plate, so that the displacements of the back surface of the friction plate in the x, y and z directions are zero, the rotation of the back surface of the friction plate around the x axis and the y axis is zero, the inner diameter of the friction plate is coupled with the central point of the friction plate, and the rotating speed of the wet friction pair around the z axis is 72.8rad/s; boundary conditions of the lubrication flow field are set, including inlet oil pressure and outlet oil pressure.
6) Setting the mutual coupling action between the wet friction pair solid model and the lubrication flow field solid model: the method comprises the steps of respectively setting interaction surfaces in respective model areas, selecting surfaces in mutual contact, and setting the interaction type to be Fluid-Structure Co-simulation, namely, carrying out real-time data exchange between a solid domain and a Fluid domain in a simulation calculation process, so that simulation of a sliding process of the wet friction pair is closer to the actual working state of the wet friction pair, the friction pair drives lubricating oil between friction pair pieces to rotate in the sliding process of the wet friction pair, meanwhile, the lubricating oil has certain reaction on the friction pair, and the wet friction pair and the lubricating oil interact in the sliding process.
As shown in FIGS. 7 and 8, the surfaces of the wet friction pair and the lubrication flow field, which are in contact with each other, are respectively selected to be provided with mutual coupling acting surfaces, and the type of interaction is Fluid-Structure Co-simulation.
7) Analyzing the flow field characteristics: the method mainly comprises analysis of flow velocity and pressure field of a lubricating flow field, corresponding lubricating oil inlet oil pressure, rotating speed of a wet friction pair and the like can be set at a model boundary condition according to actual working conditions of the wet friction pair so as to enable simulation to be closer to actual working conditions of the wet friction pair, and then change conditions of flow velocity, pressure and the like of the lubricating flow field of the wet friction pair under different working conditions are analyzed.
In a preferred embodiment, the flow field characteristics of the lubrication flow field of the wet friction pair under the conditions of general working conditions and different rotating speed working conditions of certain lubrication oil pressure are calculated through enumeration simulation.
Fig. 9a to 9d, fig. 10a to 10d, and fig. 11a to 11d show characteristic distribution of the lubrication flow field obtained under a general working condition of the simulated wet friction pair, such as flow velocity vector diagrams of the lubrication flow field when fig. 9a to 9d are 0.06s, 0.08s, 0.1s, and 0.12s, flow velocity distribution cloud diagrams of the lubrication flow field when fig. 10a to 10d are 0.06s, 0.08s, 0.1s, and 0.12s, and pressure distribution cloud diagrams of the lubrication flow field when fig. 11a to 11d are 0.06s, 0.08s, 0.1s, and 0.12 s; as shown in fig. 12a to 12d and fig. 13a to 13d, fig. 12a to 12d are stress graphs of the friction plate at 0.06s, 0.08s, 0.1s and 0.12s, and fig. 13a to 13d are stress graphs of the steel plate at 0.06s, 0.08s, 0.1s and 0.12s, which are corresponding wet friction pair calculation results obtained by coupling calculation of the wet friction pair and the lubrication flow field under the working condition.
Fig. 14a to 14d and fig. 15a to 15d show the distribution characteristics of the lubrication flow field of the wet friction pair under the working conditions of a certain lubrication oil pressure rotation speed of 500rpm, 700rpm, 1000rpm and 1200rpm, respectively, fig. 14a to 14d show the pressure distribution cloud charts of the lubrication flow field of the wet friction pair under the working conditions of various rotation speeds, and fig. 15a to 15d show the flow speed distribution cloud charts of the lubrication flow field of the wet friction pair under the working conditions of various rotation speeds.
8) As can be seen from the simulation result of the wet friction pair lubricating flow field, the flow velocity distribution cloud chart and the pressure distribution cloud chart of the lubricating oil flow field have a corresponding relationship, the flow velocity of oil liquid at the oil outlet of the oil groove is larger, the pressure is smaller, the flow velocity of oil liquid in the oil groove of the inner ring is smaller, the pressure is larger, the flow velocity and the pressure distribution of the flow field have increasing trends of different degrees along with the increase of time, and the phenomenon of obvious uneven distribution exists. The lubricating flow field has certain influence on the wet friction pair, but the influence effect is small. The flow velocity and the pressure of the wet friction pair lubrication flow field are increased along with the increase of the rotating speed of the wet friction pair at the same moment under the same certain lubrication oil pressure condition, and the change trends are consistent.
In conclusion, the flow field characteristics of the lubrication flow field of the wet friction pair can be analyzed according to the results obtained by the coupling simulation calculation of the wet friction pair and the lubrication flow field thereof, the flow field velocity and pressure distribution rule are researched, the lubrication flow field velocity and oil pressure distribution conditions and the like of the wet friction pair under different working conditions are simulated and simulated, the calculation method of the coupling simulation of the wet friction pair and the lubrication flow field thereof is used for researching the flow field characteristics thereof, the boundary condition of the lubrication oil flow field is loaded by the coupling action of the wet friction pair and the lubrication oil flow field thereof, and the traditional loading mode of performing boundary input on the flow field is abandoned. The new simulation idea of the wet friction side flow field lays a certain foundation for the influence of the flow field on the stress-strain field of the wet friction pair and the subsequent optimization of the wet friction pair.
The above embodiments are only for illustrating the present invention, and the steps may be changed, and on the basis of the technical solution of the present invention, the modification and equivalent changes of the individual steps according to the principle of the present invention should not be excluded from the protection scope of the present invention.
Claims (7)
1. A method for modeling distribution characteristics of a lubricating flow field in a wet friction pair friction sliding process is characterized by comprising the following steps of:
1) Establishing a wet friction pair solid model and a lubrication flow field model;
2) An assembly body is arranged: respectively selecting respective parts for assembling the wet friction pair solid model and the lubrication flow field solid model;
3) Grid division: before grid division, virtual surface cutting is respectively carried out on a wet friction pair solid model and a lubrication flow field solid model along the same cutting surface, regular grids are drawn, the same number of seeds are arranged at the contact edges of the two models, and the good data exchange is carried out in the coupling calculation process of the two models through the same cutting surface and the same number of seeds of the contact surface;
4) Setting analysis steps and field output: firstly, specifying the type of an analysis step, selecting a Flow analysis step type, wherein a lubrication Flow field model is a CFD type; performing Explicit Dynamic analysis on the wet friction pair, so that a Dynamic analysis step type and an Explicit analysis step type are selected, and the two models are set to have the same analysis step time for performing coupling calculation;
5) Applying boundary conditions for the wet friction pair solid model and the lubrication flow field model;
6) Setting the mutual coupling action between the wet friction pair solid model and the lubrication flow field solid model;
7) Analyzing the flow field characteristics: analyzing the flow velocity and pressure field of the lubricating flow field;
8) According to the simulation result of the wet friction pair lubricating flow field, the flow velocity distribution cloud chart and the pressure distribution cloud chart of the lubricating oil flow field have a corresponding relation, the flow velocity of oil liquid at the oil outlet of the oil groove is larger, the pressure is smaller, the flow velocity of the oil liquid in the oil groove of the inner ring is smaller, the pressure is larger, the flow velocity and the pressure distribution of the flow field have increasing trends of different degrees along with the increase of time, and the phenomenon of obvious uneven distribution exists; the lubricating flow field has a small influence on the wet friction pair; the flow velocity and the pressure of the wet friction pair lubrication flow field are increased along with the increase of the rotating speed of the wet friction pair at the same moment under the same lubrication oil pressure condition, and the change trends are consistent.
2. The method of claim 1, wherein: in the step 1), a simplified wet friction pair solid model with four radial oil grooves is established according to the actual sizes of the inner diameter and the outer diameter of a wet friction pair, the model type is standard & explicit, the wet friction pair is drawn into a whole, imaginary surface cutting is carried out on the contact surface of a friction plate and a steel sheet, and then the friction pair oil grooves are drawn according to the size of the wet friction pair model oil grooves.
3. The method of claim 1 or 2, wherein: in the step 1), a lubricating flow field model with a model type of CFD is drawn according to the size of the oil groove of the wet friction pair model, and the material attribute of the lubricating flow field model is set according to the physical property of lubricating oil.
4. The method of claim 1, wherein: in the step 4), a field output variable is selected according to the calculated quantity to be obtained by model calculation, the calculated quantity of the flow field flow velocity and the flow field pressure is required to be obtained for the lubrication flow field, and the stress strain variation quantity of the wet friction pair is concerned.
5. The method of claim 1, wherein: in the step 5), the boundary conditions of the lubrication flow field solid model include an inlet oil pressure and an outlet oil pressure, the boundary conditions of the wet friction pair solid model include degrees of freedom in six directions, the displacements of the back surfaces of the friction plates in the x, y and z directions are set to be zero, the rotations of the friction plates around the x axis and the y axis are set to be zero, and the rotation speed of the wet friction pair around the z axis is 700r/min, which is about 72.8rad/s.
6. The method of claim 1, wherein: in the step 6), setting the mutual coupling action between the wet friction pair solid model and the lubrication flow field solid model: the method comprises the steps of respectively setting interaction surfaces in respective model areas, selecting surfaces which are mutually contacted, setting the interaction type to be Fluid-structured Co-simulation, carrying out real-time data exchange between a solid domain and a Fluid domain, driving lubricating oil between friction pair pieces to rotate by a friction pair in the sliding process of a wet friction pair, and meanwhile, enabling the lubricating oil to have certain reaction on the friction pair, and enabling the wet friction pair and the lubricating oil to interact in the sliding process.
7. The method of claim 1, wherein: in the step 7), analyzing flow field characteristics: and setting corresponding lubricating oil inlet oil pressure and the rotating speed of the wet friction pair at the boundary condition of the model according to the actual working condition of the wet friction pair, and further analyzing the flow speed and pressure change conditions of the lubricating flow field of the wet friction pair under different working conditions.
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