CN102567580A - Wet-type friction plate characteristic analysis method based on computational fluid dynamics - Google Patents
Wet-type friction plate characteristic analysis method based on computational fluid dynamics Download PDFInfo
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Abstract
The invention discloses a wet-type friction plate characteristic analysis method based on computational fluid dynamics, which includes the following steps: 1 drawing a three-dimensional structure graph of a wet-type friction plate on a computer, namely, utilizing computer-aided design (CAD) mapping software to draw a complete planar graph of the wet-type friction plate and utilizing unigraphics (UG) three-dimensional mapping software to draw a complete three-dimensional part structure graph of the wet-type friction plate; 2 dividing grids for the three-dimensional part structure graph on the computer; and 3 utilizing the computational fluid dynamics software FLUENT to make fluid field characteristic analysis on the computer: (1) defining, hypothesizing and setting parameters for a wet-type friction plate oil duct model of generating tetrahedron grid cells in the computational fluid dynamics software FLUENT; (2) after the step (1), enabling the FLUENT software to run on the computer to obtain a whole streamlined diagram, a simulated whole static pressure diagram and a simulated whole dynamic pressure diagram of the wet-type friction plate, and (3) analyzing and processing simulation results.
Description
Technical field
The present invention relates to the dynamic analysis method of a kind of wet friction sheet in design process, more particularly, the present invention relates to the wet friction sheet characteristic analysis method based on Fluid Mechanics Computation of a kind of friction disc shape the wet clutch properties influence.
Background technology
Clutch module in the wet-type double-clutch automatic speed-change device is owing to work in the space of a sealing; Because the friction and the effect of other heat energy make the temperature of system in continuous rising, so the assurance system is a factor weighing this system performance quality in suitable temperature range work in this process.Moreover because the chip that frequent combination divides defection to make friction disc wear produce also can influence the performance of system, so hydraulic transmission oil not only will take away the heat that produces, but also will take the chip that system produces in the filtration unit of system to.Like this hydraulic transmission oil can be in friction disc glibly circulation be exactly the emphasis of solution, the shape convection cell of friction disc mobile plays critical effect.
The research of friction disc performance is a problem that enjoys the researcher to pay close attention to all the time.All be on the basis of practical experience to the friction disc The Characteristic Study at present, manufacture experimently out needed friction disc,, see the actual demand that to satisfy product through calculating contrast again through the relevant data of special-purpose test bed testing in conjunction with the certain theory basic engineering.
But like the performance that the discontented foot of fruit product is wanted, will change wherein correlation parameter and again trial-production do experiment.Therefore, this method needs great amount of manpower, financial resources and material resources.
Summary of the invention
Technical matters to be solved by this invention is to have overcome the problem that prior art exists, and a kind of wet friction sheet characteristic analysis method based on Fluid Mechanics Computation is provided.
For solving the problems of the technologies described above, the present invention adopts following technical scheme to realize: described wet friction sheet characteristic analysis method based on Fluid Mechanics Computation comprises the steps:
1. the tomograph of wet friction sheet on computers draws:
1) utilize the CAD mapping software to draw the planimetric map of complete wet friction sheet on computers.
2), utilize the three-dimensional part structural drawing of the wet friction sheet that UG three-dimensional drawing software draws complete on computers, and the three-dimensional part structural drawing is simplified and supposed according to the planimetric map of complete wet friction sheet.
2. on computers the three-dimensional part structural drawing is carried out grid dividing:
1) utilizes the IGES file of general format on computers, the three-dimensional part structural drawing of the wet friction sheet that utilizes UG three-dimensional drawing software to set up is imported among the pre-processing software GAMBIT of cfdrc FLUENT.
2) utilize software GAMBIT to set up the oil duct model of wet friction sheet.
3) utilize software GAMBIT on computers wet friction sheet oil duct model to be carried out grid dividing, generate the tetrahedral grid unit that meets calculation requirement, form a wet friction sheet oil duct model that comprises the tetrahedral grid unit.
3. utilize cfdrc FLUENT to carry out the flow field characteristic analysis on computers:
1) the wet friction sheet oil duct model that generates the tetrahedral grid unit is defined, supposes in cfdrc FLUENT and the parameter setting:
A. import the wet friction sheet oil duct model that contains the tetrahedral grid unit
The wet friction sheet oil duct model that comprises the tetrahedral grid unit that utilizes software GAMBIT to generate is imported among the cfdrc FLUENT.
B. check whether the wet friction sheet oil duct model that contains the tetrahedral grid unit has problems
Must check the grid model of wet friction sheet after the wet friction sheet oil duct model that will contain the tetrahedral grid unit imports cfdrc FLUENT, can directly adopt CFD to find the solution so that determine whether.
C. select solver and running environment
It all is that the default setting of cfdrc FLUENT is the separate type solver that solver that the analysis of wet friction sheet flow field is adopted and running environment are provided with.
D. confirm computation model
It is turbulence model that wet friction sheet flow field is selected in analysis of the present invention, the k-ε model of turbulence model selection standard, and k is the turbulent flow pulse energy, unit. joule, ε is the dissipative shock wave of turbulent flow pulse energy;
E. define material
The hydraulic transmission oil that wet friction sheet flow field uses is the wheel box transmission oil.
F., boundary condition is set
What the import border was chosen is the speed inlet, and what export boundary definition is pressure export, and other boundary setting is the wall border.
G. be provided with and find the solution controlled variable
Discrete scheme is set and owes relaxation factor all according to default setting among the cfdrc FLUENT.
H., the monitored parameter of solution procedure is set
In the solver computation process, divide the convergence and the current result of calculation of parameter dynamic surveillance calculating through residual error, statistical value, power, area branch and the volume of inspection variable.
I. the initialization flow field separates
Before beginning wet friction sheet flow field found the solution, the user must provide the initial guess of separating to wet friction sheet flow field to cfdrc FLUENT.
J. wet friction sheet flow field iterative computation
The calculation requirement of the stable state that wet friction sheet flow field analysis of the present invention is selected, the iteration step number is 1000.
2), move whole static pressure figure of bulk flow line chart, the emulation of wet friction sheet and the whole dynamic pressure figure of wet friction sheet emulation that FLUENT software has obtained wet friction sheet fluid on computers through the step of a to j that associates.
3) simulation result is carried out analyzing and processing:
A. the motion pattern of wet friction sheet fluid is that massless particle mobility status in the computational fields is visual, and these particles discharge on the surface of appointment, particle is discharged in the oil groove porch, thereby accomplished the mobility status in whole flow field.
B. the whole static pressure figure of wet friction sheet emulation all is regarded as isogram with wet friction sheet emulation integral body dynamic pressure figure, isogram be on specified surface through the line of some spots, variable such as pressure are definite value on this line.
The three-dimensional part structural drawing is simplified and hypothesis is meant described in the technical scheme:
1) inner flow passage of looking on the wet friction sheet is desirable runner, disregards inner flow passage on the wet friction sheet to the influence of runner internal characteristic.
2) according to of the requirement of SAE standard to hydraulic transmission oil; Its density and viscosity change very little in the course of the work; Confirm as constant; The density of getting hydraulic transmission oil respectively is that ρ=880kg/m3 and hydrodynamic drive oil viscosity are μ=0.012936Ns/m2, and promptly the hydraulic transmission oil in the wet friction sheet is an incompressible viscous fluid.
3) be in the oil circuit of continuous cool cycles owing to hydraulic transmission oil is actual, so the temperature variation of hydraulic transmission oil is little, ignores the influence of temperature to hydraulic transmission oil, only studies the speed and the pressure distribution in flow field.
The oil duct model that utilizes software GAMBIT to set up the wet friction sheet described in the technical scheme is meant:
1) under the situation that does not influence result of calculation, for saving computational resource and improving counting yield, in GAMBIT, need some minor faces be left out, the part of not participating in analyzing also will be left out, and also needs not merge and the part of participating in analyzing is merged into an integral body.
2) utilize the inside/outside diameter size of wet friction sheet and the thickness of wet friction sheet, create one and comprise the wet friction sheet,, the entity of wet friction sheet is plucked out from torus, set up wet friction sheet oil duct model through Boolean calculation at interior torus.
Compared with prior art the invention has the beneficial effects as follows:
1. the wet friction sheet characteristic analysis method based on Fluid Mechanics Computation of the present invention is that the inventor utilizes the three-dimensional graphics software of UG; The size of formulating according to design drawing; Create the wet friction sheet three-dimensional model that can be used for cfdrc (CFD) analysis, utilized the pre-processing software of CFD to carry out carrying out simulation analysis after the corresponding grid dividing.Before trial production and test, can carry out numerical simulation and performance prediction to product in the short period of time; And it is visual that sightless flow field in the clutch coupling is changed realization; And through the change correlation parameter reach the optimal design effect; For the exploitation of entire product saves time, raise the efficiency.This method has played certain facilitation to traditional design method.
Description of drawings
Below in conjunction with accompanying drawing the present invention is further described:
Fig. 1 is the FB(flow block) of the wet friction sheet characteristic analysis method based on Fluid Mechanics Computation of the present invention;
Fig. 2 is the two-dimensional design figure based on friction disc among the embodiment in the wet friction sheet characteristic analysis method of Fluid Mechanics Computation of the present invention;
Fig. 3 is the tomograph based on friction disc among the embodiment in the wet friction sheet characteristic analysis method of Fluid Mechanics Computation of the present invention;
Fig. 4 is the tomograph that amplifies based on the part of friction disc among the embodiment in the wet friction sheet characteristic analysis method of Fluid Mechanics Computation of the present invention;
Fig. 5 is the oil duct model synoptic diagram based on friction disc among the embodiment in the wet friction sheet characteristic analysis method of Fluid Mechanics Computation of the present invention;
Fig. 6 is of the present invention based among the embodiment in the wet friction sheet characteristic analysis method of Fluid Mechanics Computation friction disc being divided the local enlarged diagram of wet friction sheet oil duct model behind the grid;
Fig. 7-a is the bulk flow line chart that adopts the wet friction sheet fluid after the wet friction sheet characteristic analysis method simulation calculating based on Fluid Mechanics Computation of the present invention finishes.
Fig. 7-b adopts the part of the wet friction sheet fluid after the wet friction sheet characteristic analysis method simulation calculating based on Fluid Mechanics Computation of the present invention finishes to amplify motion pattern;
Fig. 8-a adopts the whole static pressure synoptic diagram of the wet friction sheet characteristic analysis method wet friction sheet emulation based on Fluid Mechanics Computation of the present invention;
Fig. 8-b adopts the local static pressure synoptic diagram that amplifies of the wet friction sheet characteristic analysis method wet friction sheet emulation based on Fluid Mechanics Computation of the present invention;
Fig. 9-a adopts the whole dynamic pressure synoptic diagram of the wet friction sheet characteristic analysis method wet friction sheet emulation based on Fluid Mechanics Computation of the present invention;
Fig. 9-b adopts the local dynamic pressure synoptic diagram that amplifies of the wet friction sheet characteristic analysis method wet friction sheet emulation based on Fluid Mechanics Computation of the present invention;
Among the figure: the friction material that A1. is outstanding, A2. oil groove, A3. friction disc internal tooth, A4. oil groove inlet, the outlet of A5. oil groove, B1. oil duct, B2. friction material, the oil duct that is provided with on the B3. friction disc oil duct model, B4. internal tooth.
Embodiment
Below in conjunction with accompanying drawing the present invention is explained in detail:
Consult Fig. 1, the wet friction sheet characteristic analysis method based on Fluid Mechanics Computation of the present invention comprises the steps:
1. the tomograph of wet friction sheet on computers draws
1) consults Fig. 2, utilize the CAD mapping software to draw two dimension (plane) component diagram of complete wet friction sheet on computers according to design requirement;
2) consult Fig. 3,, utilize the three-dimensional part structural drawing shown in figure of the wet friction sheet that UG three-dimensional drawing software draws complete on computers according to two dimension (plane) component diagram of the complete wet friction sheet shown in the accompanying drawing 2; Consult Fig. 4, for the ease of analyzing the partial 3-D modular construction figure of the wet friction sheet of intercepting shown in figure, and the three-dimensional part structural drawing simplified and suppose:
(1) inner flow passage of looking on the wet friction sheet is desirable runner, disregards inner flow passage on the wet friction sheet to the influence of runner internal characteristic;
(2) according to the requirement of SAE standard (the SAE standard is abbreviation, the Society ofAutomotive Engineers of U.S. automotive engineer association) to hydraulic transmission oil; Its density and viscosity change very little in the course of the work; Can be assumed to be constant; The density of getting hydraulic transmission oil respectively is that ρ=880kg/m3 and hydrodynamic drive oil viscosity are μ=0.012936 Ns/m2, this means that the hydraulic transmission oil in the wet friction sheet is typical incompressible viscous fluid;
(3) be in the oil circuit of continuous cool cycles owing to hydraulic transmission oil is actual, so the temperature variation of hydraulic transmission oil is little, can ignore the influence of temperature to hydraulic transmission oil, only studies the speed and the pressure distribution in flow field.
2. on computers the three-dimensional part structural drawing is carried out corresponding grid dividing
1) utilizes the IGES file of general format on computers, the three-dimensional part structural drawing of the wet friction sheet that utilizes UG three-dimensional drawing software to set up in the step 1 is imported among the pre-processing software GAMBIT of cfdrc FLUENT;
2) consult Fig. 5, utilize the corresponding command among the software GAMBIT finally to set up wet friction sheet oil duct model in conjunction with actual conditions:
The major function of GAMBIT comprises the constructive geometry model, divides grid and three aspects of specified boundary, and wherein dividing grid is its topmost function, its final grid file that includes boundary information that generates.
(1) under the situation that does not influence result of calculation, for saving computational resource and improving counting yield, in GAMBIT, need some minor faces be left out, the part of not participating in analyzing also will be left out, and also needs not merge and the part of participating in analyzing is merged into an integral body.
(2) combine actual conditions; Utilize the inside/outside diameter size of wet friction sheet and the thickness of wet friction sheet, create one and comprise the wet friction sheet at interior torus, through Boolean calculation; The entity of wet friction sheet is plucked out from torus, finally set up wet friction sheet oil duct model.
3) consult Fig. 6; After the modelling of wet friction sheet oil duct is accomplished; Utilize software GAMBIT on computers wet friction sheet oil duct model to be carried out grid dividing; Generation meets the tetrahedral grid unit of calculation requirement, finally forms a wet friction sheet oil duct model that comprises the tetrahedral grid unit;
What this model meshes adopted is tetrahedral grid, and wet friction slice graticule unit number is 795233, and size of mesh opening is 0.3mm.Shown in figure.
3. utilize cfdrc FLUENT to carry out the flow field characteristic analysis on computers, concrete steps are following:
1) the wet friction sheet oil duct model that generates the tetrahedral grid unit is defined, supposes and the parameter setting that concrete steps are following in FLUENT software:
(1) imports the wet friction sheet oil duct model that contains the tetrahedral grid unit
The wet friction sheet oil duct model that includes the tetrahedral grid unit that utilizes software GAMBIT to generate is imported among the cfdrc FLUENT;
(2) check whether the wet friction sheet oil duct model that contains the tetrahedral grid unit has problems
Must check this model after the wet friction sheet oil duct model that will contain the tetrahedral grid unit imports to cfdrc FLUENT, can directly adopt CFD to find the solution so that determine whether;
(3) select solver and running environment
Solver among the FLUENT mainly contains separate type solver and manifold type solver.But the separate type solver is mainly used in can not baric flow moving moving with little baric flow, and high speed is compressible to flow and the manifold type solver is mainly used in.Now, two kinds of solvers all are applicable to from being pressed onto flowing very on a large scale of can pressing at a high speed.It all is default settings of FLUENT that solver that wet friction sheet flow field analysis among the present invention is adopted and running environment are provided with, i.e. the separate type solver.
(4) confirm computation model
When Reynolds number during greater than critical value, a series of complicated the variation can appear, finally cause the essential change of flow performance.It is turbulence model that wet friction sheet flow field is selected in analysis of the present invention, and the k-ε model of turbulence model selection standard, k are turbulent flow pulse energy (joules), and ε is the dissipative shock wave (%) of turbulent flow pulse energy.
(5) definition material
The hydraulic transmission oil that wet friction sheet flow field uses is the wheel box transmission oil, and the parameter of wheel box transmission oil is as shown in table 1.
The parameter of table 1 wheel box transmission oil
| The superfine black overlord 15W-40 of Mobil | |
| The SAE viscosity grade | 15W-40 |
| Viscosity, ASTM D 445 | |
| cSt ?40℃ | 107 |
| cSt ?100℃ | 14.7 |
| Viscosity index, ASTM D 2270 | 135 |
| The sulfuration ash content, wt%, ASTM D 874 | 1.1 |
| Total base number, mg KOH/g, ASTM D 2896 | 10.0 |
| Pour point, ℃, ASTM D 97 | -27 |
| Flash-point, ℃, ASTM D 92 | 220 |
| 15 ℃ of density, kg/1, ASTM D 4052 | 0.88 |
(6) boundary condition is set
What oil groove inlet A4 chose on the border is speed inlet (being used to define the flow speed of import boundary and other scalar type variablees that flow); What oil groove exported the A5 boundary definition is pressure export (being used to define flow outlet boundary stagnation pressure and other scalar type variablees), and other boundary setting is the wall border.
(7) controlled variable is found the solution in setting
Discrete scheme is set and owes relaxation factor all according to default setting among the FLUENT.
(8) monitored parameter of solution procedure is set
Calculate in (iteration) process at solver, grade through residual error, statistical value, power, area branch and the volume of checking variable, the user can keep watch on the convergence and the current result of calculation of calculating dynamically.After each step iteration, solver can calculate and preserve lift, and the residual error of resistance or moment coefficient and each variable is created the convergent historical record.Also can print and draw the convergent historical record, also can they be saved in external file.The analysis precision of setting of the present invention is 0.001 to be that relevant variable reaches and then thinks after this value to calculate and restrain.
(9) the initialization flow field separates
Before beginning wet friction sheet flow field found the solution, the user must provide the initial guess of separating to wet friction sheet flow field to cfdrc FLUENT.This initial guess has significant effects to the convergence of separating, with final actual separating more near good more.Have two kinds of methods to come separating of initialization flow field:
A. come all borders in the whole wet friction sheet of the initialization flow field with identical flow field variate-value;
Cover a value or function b. in selected unit area, for the flow field variable of selecting.What the present invention analyzed selection is that first method is come separating of initialization flow field.
(10) wet friction sheet flow field iterative computation
The calculation requirement of the stable state that wet friction sheet flow field analysis of the present invention is selected, the iteration step number is 1000.
2) consult Fig. 7 to Fig. 9; Step through above (1) to (10); Move the bulk flow line chart that FLUENT software has obtained wet friction sheet fluid as shown in Figure 7 on computers, whole static pressure figure of wet friction sheet emulation shown in Figure 8 and the whole dynamic pressure figure of wet friction sheet emulation as shown in Figure 9.
3) simulation result is carried out analyzing and processing:
Whole hydraulic transmission oil be from wet friction sheet center to internal tooth, flow into through oil groove inlet A4, oil groove outlet A5 flows out and reaches flowing of fluid, and plays lubricated effect.
Consult Fig. 7, the motion pattern of wet friction sheet fluid is that massless particle mobility status in the computational fields is visual.These particles discharge on the surface of appointment.In conjunction with this analysis, we discharge particle at oil groove inlet A4 place, thereby have accomplished the mobility status in whole flow field.The wet friction sheet tangible whirlpool occurs at the place, space of adjacent two internal tooths, and then because the wet friction sheet rotates, and fluid receives action of centrifugal force, and the fluid of doing swirl flow continues to be dumped into oil duct, A5 flows out from the oil groove outlet.
Consult Fig. 8 and Fig. 9; Can also obtain whole static pressure figure of wet friction sheet emulation as shown in Figure 8 and the whole dynamic pressure figure of wet friction sheet emulation as shown in Figure 9 through computing, whole static pressure figure of wet friction sheet emulation and the whole dynamic pressure figure of wet friction sheet emulation all are regarded as isogram.Isogram be on specified surface through the line of some spots, variable on this line (like pressure) is a definite value.Isogram is the figure of on physical region, being made up of many isoline of same variable.Fig. 8-b carries out the local static pressure figure that amplifies for simulation result is more clearly analyzed with Fig. 8-a; As can be seen from the figure the wet friction sheet has high pressure in the oil duct lower right corner of between cog in adjacent; Be because the wet friction sheet rotates around Z axle positive dirction, and the oil duct between the adjacent internal tooth is an enclosed cavity, fluid receives centrifugal action; Impact the right side wall, thereby form the high pressure of right side wall.
Can change each other between dynamic pressure and the static pressure, both equal total head at sum, dynamic pressure and velocity correlation.We are not difficult to find out on Fig. 9; Dynamic pressure value in the wet friction sheet oil duct in the adjacent relatively interior between cog oil groove of dynamic pressure value will exceed a lot, and reason is the rotation of oil duct inner fluid through the wet friction sheet, flows out from the oil groove exit with higher speed; And the oil groove fluid at adjacent internal tooth place receives stopping of peripheral wall surface; Eddy-currents occurs, speed reduces or is static, so dynamic pressure is on the low side.In conjunction with the static pressure map analysis, the static pressure here is the highest.Can see the mobility status of hydraulic transmission oil in whole wet friction sheet confined space significantly, hydraulic transmission oil can flow out from the oil groove exit swimmingly, for the characteristic of further studying the wet friction sheet provides a kind of new method.
Wet friction sheet characteristic analysis method based on Fluid Mechanics Computation of the present invention passes through the simulation analysis to wet friction sheet interior oil flow field internal characteristic; Draw the operating characteristic of wet friction sheet; Not only can observe the flow field simulation characteristic in the wet friction sheet intuitively, and strong basis is provided the optimization analysis of product.Wet friction sheet characteristic analysis method based on Fluid Mechanics Computation of the present invention can be predicted performance of products in the short period of time; Exploitation to new product plays a positive role, and can practice thrift great amount of time, manpower; Material resources and financial resources improve Products Development efficient.
Claims (3)
1. the wet friction sheet characteristic analysis method based on Fluid Mechanics Computation is characterized in that, described wet friction sheet characteristic analysis method based on Fluid Mechanics Computation comprises the steps:
1) draw the on computers tomograph of wet friction sheet:
(1) utilize the CAD mapping software to draw the planimetric map of complete wet friction sheet on computers;
(2), utilize the three-dimensional part structural drawing of the wet friction sheet that UG three-dimensional drawing software draws complete on computers, and the three-dimensional part structural drawing is simplified and supposed according to the planimetric map of complete wet friction sheet;
2) on computers the three-dimensional part structural drawing is carried out grid dividing:
(1) utilizes the I GES file of general format on computers, the three-dimensional part structural drawing of the wet friction sheet that utilizes UG three-dimensional drawing software to set up is imported among the pre-processing software GAMBIT of cfdrc FLUENT;
(2) utilize software GAMBIT to set up the oil duct model of wet friction sheet;
(3) utilize software GAMBIT on computers wet friction sheet oil duct model to be carried out grid dividing, generate the tetrahedral grid unit that meets calculation requirement, form a wet friction sheet oil duct model that comprises the tetrahedral grid unit;
3) utilize cfdrc FLUENT to carry out the flow field characteristic analysis on computers:
(1) the wet friction sheet oil duct model that generates the tetrahedral grid unit is defined, supposes in cfdrc FLUENT and the parameter setting:
A. import the wet friction sheet oil duct model that contains the tetrahedral grid unit
The wet friction sheet oil duct model that comprises the tetrahedral grid unit that utilizes software GAMBIT to generate is imported among the cfdrc FLUENT;
B. check whether the wet friction sheet oil duct model that contains the tetrahedral grid unit has problems
Must check the grid model of wet friction sheet after the wet friction sheet oil duct model that will contain the tetrahedral grid unit imports cfdrc FLUENT, can directly adopt CFD to find the solution so that determine whether;
C. select solver and running environment
It all is that the default setting of cfdrc FLUENT is the separate type solver that solver that the analysis of wet friction sheet flow field is adopted and running environment are provided with;
D. confirm computation model
It is turbulence model that wet friction sheet flow field is selected in analysis of the present invention, the k-ε model of turbulence model selection standard, and k is the turbulent flow pulse energy, unit. joule, ε is the dissipative shock wave of turbulent flow pulse energy;
E. define material
The hydraulic transmission oil that wet friction sheet flow field uses is the wheel box transmission oil;
F., boundary condition is set
What the import border was chosen is the speed inlet, and what export boundary definition is pressure export, and other boundary setting is the wall border;
G. be provided with and find the solution controlled variable
Discrete scheme is set and owes relaxation factor all according to default setting among the cfdrc FLUENT;
H., the monitored parameter of solution procedure is set
In the solver computation process, divide the convergence and the current result of calculation of parameter dynamic surveillance calculating through residual error, statistical value, power, area branch and the volume of inspection variable;
I. the initialization flow field separates
Before beginning wet friction sheet flow field found the solution, the user must provide the initial guess of separating to wet friction sheet flow field to cfdrc FLUENT;
J. wet friction sheet flow field iterative computation
The calculation requirement of the stable state that wet friction sheet flow field analysis of the present invention is selected, the iteration step number is 1000;
(2), move whole static pressure figure of bulk flow line chart, the emulation of wet friction sheet and the whole dynamic pressure figure of wet friction sheet emulation that FLUENT software has obtained wet friction sheet fluid on computers through the step of a to j that associates;
(3) simulation result is carried out analyzing and processing:
A. the motion pattern of wet friction sheet fluid is that massless particle mobility status in the computational fields is visual, and these particles discharge on the surface of appointment, particle is located to discharge at oil groove inlet (A4), thereby accomplished the mobility status in whole flow field;
B. the whole static pressure figure of wet friction sheet emulation all is regarded as isogram with wet friction sheet emulation integral body dynamic pressure figure, isogram be on specified surface through the line of some spots, variable such as pressure are definite value on this line.
2. according to the described wet friction sheet characteristic analysis method of claim 1, it is characterized in that, described the three-dimensional part structural drawing simplified and hypothesis is meant based on Fluid Mechanics Computation:
1) inner flow passage of looking on the wet friction sheet is desirable runner, disregards inner flow passage on the wet friction sheet to the influence of runner internal characteristic;
2) according to of the requirement of SAE standard to hydraulic transmission oil; Its density and viscosity change very little in the course of the work; Confirm as constant; The density of getting hydraulic transmission oil respectively is that ρ=880kg/m3 and hydrodynamic drive oil viscosity are μ=0.012936Ns/m2, and promptly the hydraulic transmission oil in the wet friction sheet is an incompressible viscous fluid;
3) be in the oil circuit of continuous cool cycles owing to hydraulic transmission oil is actual, so the temperature variation of hydraulic transmission oil is little, ignores the influence of temperature to hydraulic transmission oil, only studies the speed and the pressure distribution in flow field.
3. according to the described wet friction sheet characteristic analysis method of claim 1, it is characterized in that the described oil duct model that utilizes software GAMBIT to set up the wet friction sheet is meant based on Fluid Mechanics Computation:
1) under the situation that does not influence result of calculation, for saving computational resource and improving counting yield, in GAMBIT, need some minor faces be left out, the part of not participating in analyzing also will be left out, and also needs not merge and the part of participating in analyzing is merged into an integral body;
2) utilize the inside/outside diameter size of wet friction sheet and the thickness of wet friction sheet, create one and comprise the wet friction sheet,, the entity of wet friction sheet is plucked out from torus, set up wet friction sheet oil duct model through Boolean calculation at interior torus.
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| CN109214128A (en) * | 2018-10-25 | 2019-01-15 | 北京信息科技大学 | A kind of sliding process lubrication flow Field distribution characteristic modeling method of rubbing of wet friction pair |
| CN109388815A (en) * | 2017-08-04 | 2019-02-26 | 中车大同电力机车有限公司 | A kind of micro-positive pressure of machinery chamber of locomotive calculation method |
| CN111090917A (en) * | 2018-10-24 | 2020-05-01 | 上汽通用汽车有限公司 | Automatic analysis method for whole vehicle air intake and exhaust system based on computational fluid dynamics |
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| 韩勇: "基于CFD技术的湿式摩擦片仿真分析研究", 《中国优秀硕士学位论文全文数据库 工程技术II辑》 * |
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| CN106814029A (en) * | 2017-01-13 | 2017-06-09 | 北京航空航天大学 | A kind of many band integration disk-type friction pair frictional behaviour Forecasting Methodologies |
| CN106814029B (en) * | 2017-01-13 | 2019-05-17 | 北京航空航天大学 | A kind of mostly band integral disk-type friction pair frictional behaviour prediction technique |
| CN109388815A (en) * | 2017-08-04 | 2019-02-26 | 中车大同电力机车有限公司 | A kind of micro-positive pressure of machinery chamber of locomotive calculation method |
| CN111090917A (en) * | 2018-10-24 | 2020-05-01 | 上汽通用汽车有限公司 | Automatic analysis method for whole vehicle air intake and exhaust system based on computational fluid dynamics |
| CN109214128A (en) * | 2018-10-25 | 2019-01-15 | 北京信息科技大学 | A kind of sliding process lubrication flow Field distribution characteristic modeling method of rubbing of wet friction pair |
| CN109214128B (en) * | 2018-10-25 | 2023-02-28 | 北京信息科技大学 | Wet friction pair sliding friction process lubrication flow field distribution characteristic modeling method |
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