CN108763846A - A kind of conical friction element Temperature Distribution predictor method - Google Patents
A kind of conical friction element Temperature Distribution predictor method Download PDFInfo
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- CN108763846A CN108763846A CN201810992829.2A CN201810992829A CN108763846A CN 108763846 A CN108763846 A CN 108763846A CN 201810992829 A CN201810992829 A CN 201810992829A CN 108763846 A CN108763846 A CN 108763846A
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- friction element
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/08—Thermal analysis or thermal optimisation
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Abstract
The present invention relates to a kind of conical friction element Temperature Distribution predictor methods, include mainly that heat transfer process is analyzed, temperature diffusion term determines, heat conduction model is established, Temperature Distribution prediction model amendment.The method is directed to novel tapered friction element in mechanical variable speed device, frictional heat mechanism of production and thermal diffusion boundary condition during consideration conical friction element taper-face contact, conical friction element cone of friction temperature distributing rule is obtained by establishing heat conduction model, and prediction model is corrected by temperature test.This method can estimate the conical friction element temperature boundary under the conditions of typical condition, as the foundation of conical friction element thermal capacity design, can also estimate different structure form conical friction element temperature distributing rule, complete the structure optimization of conical friction element.
Description
Technical field
The present invention relates to the technical fields of conical friction element Temperature Prediction, and in particular to a kind of conical friction element temperature
It is distributed predictor method, is estimated suitable for conical friction element Temperature Distribution and thermal capacity designs.
Background technology
Generally use wet friction element as shifting element in mechanical variable speed device, in order to improve torque-transfer capability,
Mostly use multi-disc disk-type friction element.Conical friction element is a kind of novel friction element transmitting torque by the conical surface, and flat
Face friction pair is compared, and conical surface friction element has the torque-transfer capability of bigger；Bringing friction element simultaneously, there are axial temperature ladders
The problem of spending needs accurate evaluation contact surface Temperature Distribution.
During wet friction element manipulation, since there are cooling oil, thermal capacity is higher than dry friction element, but
It slides and rubs or continuous gear shift operation when occasionally having long in vehicle torque transmittance process, it is more that friction element surface generates heat, needs pre-
Estimate cone of friction Temperature Distribution, ensures effective fluid cooling, friction element is avoided to fail because temperature is excessively high.
Conical friction element cone of friction Temperature Distribution predictor method is by the heat flow density, right under the conditions of typical condition
Heat transfer boundary and conical friction element structure size are flowed as variable, cone of friction distribution prediction model are established, in cone of friction
Output node, assessment contact conical surface heat distribution rule are set.Model is modified by the measured value under typical condition, is formed
Effective Temperature Distribution predictor method.
Invention content
The technical problem to be solved in the present invention is：For novel tapered friction element frictional behaviour design requirement, cone is proposed
Shape friction element cone of friction Temperature Distribution predictor method, to typical condition inferior pyramidal friction element cone of friction Temperature Distribution into
Row evaluation provides design considerations for the design of conical friction element thermal capacity and Optimal Structure Designing.
The technical solution adopted by the present invention is：A kind of conical friction element Temperature Distribution predictor method, the method pass through
Typical condition condition is analyzed, pyramidal structure configuration characteristic, load, rotating speed, friction material friction coefficient is specified, determines total frictional heat
Flow；By analyzing oil lubrication condition, conical friction element cylindrical wall face heat convection is specified, annular oil groove wall surface convection current is changed
The temperature diffusion conditions such as heat；Conical friction element Temperature Prediction model is established, determines contact conical surface temperature change, and pass through temperature
Test corrects Temperature Distribution prediction model, forms effective conical friction element Temperature Distribution predictor method.
The principle of the present invention is：For conical friction element in friction process, most mechanical energy is converted to heat
Can, a part of heat is transmitted by itself heat transfer, and a part of heat is conducted by the heat convection with fluid.Determination rubs
Wipe material properties and converctive heat transfer boundary, then can accurate assessment conical friction element conical surface Temperature Distribution, pass through actual measurement
Temperature can be modified the hot distribution coefficient of contact surface, form accurate Temperature Distribution predictor method.
Compared with the prior art, the invention has the advantages that：The present invention provides one kind being used for novel tapered friction element
The method that Temperature Distribution is estimated can be used for the design of conical friction element thermal capacity, while can analyze different oil lubrication items
Temperature Distribution under part and friction element structure type, optimizes friction element, reduces the experimental test time, shortens
Design cycle.
Description of the drawings
Fig. 1 is the method for the present invention implementation flow chart；
Fig. 2 is heat transfer process analytic process figure in the present invention；
Fig. 3 is temperature diffusion term figure in the present invention；
Fig. 4 is temperature distribution model Establishing process figure in the present invention；
Fig. 5 is temperature distribution node hum pattern in the present invention；
Fig. 6 is conical friction element conical surface temperature profile in the present invention.
Specific implementation mode
The implementation process of the method for the present invention is illustrated below in conjunction with the accompanying drawings.After conical friction element structure determination, temperature
Degree distribution predictor method includes mainly that heat transfer process is analyzed, and temperature diffusion term determines, heat conduction model is established, Temperature Distribution
Prediction model amendment.
Step (1)：Conical friction element heat transfer process is analyzed；Conical friction element contact process is that a mechanical energy turns
Turn to the process of frictional heat.The total amount of heat of the contact conical surface can be obtained by formula：
qt=μ pr ω
Wherein qt(W/m2) heat flow in friction process, the friction coefficient between μ friction materials, p-contact load (Pa), ω
Friction element relative rotation speed (rad/s), the radius (m) of r friction elements.
Heat flow and conical surface radius are linear relationships.Friction element material, structure, lubricating condition, contact under typical condition
Pressure determines, measures the friction coefficient between friction material by experiment, then can determine the heat flow under the conditions of typical condition.It presses
Heat flow is proportionately distributed to the contact conical surface according to material properties.
Step (2)：Conical friction element temperature diffusion term determines；Conical friction element heat transfer process is mainly by material
Attribute itself determines.The sliding heat exchange rubbed between the process conical surface and cooling oil is the main temperature diffusion of conical friction element
Boundary is mainly determined by fluid and friction element contact interface convection transfer rate.And convection transfer rate is mainly first with friction
Part architectural characteristic is related with lubricating condition.The calculating of friction element heat convection is affected to Temperature Distribution.Conical friction element
Fuel system is axle center fuel feeding, belongs to forced-convection heat transfer mode.According to design feature, converctive heat transfer boundary can be divided into circle
Post jamb face heat convection, annular oil groove wall surface heat convection.Cylinder wall surface is mainly the inside and outside anchor ring of friction element, can be according to
Horizontal to plunder the calculating of cylinder forced-convection heat transfer, groove wall surface can be calculated according to forced-convection heat transfer.
Step (3)：Conical friction element heat conduction model is established；Determine conical friction element structure and parameter material category
Property, threedimensional model is established, mesh generation is carried out to model, applies thermal force and converctive heat transfer boundary, defines output node, is solved
Equation obtains profiling temperatures.
Step (4)：Conical friction element Temperature Distribution prediction model amendment.
Using thermocouple temperature measurement method, multiple thermocouple measuring points are installed, measures sliding operating mode contact interface temperature of rubbing, is connect
Interface temperature gradient is touched, evaluation temperature is distributed prediction model accuracy, and hot-fluid allocation proportion, thermal force item are corrected by measured value
Part and converctive heat transfer boundary form reliable conical friction element Temperature Distribution prediction model.
Claims (5)
1. a kind of conical friction element Temperature Distribution predictor method, it is characterised in that realize that steps are as follows：
Include mainly that heat transfer process is analyzed, temperature diffusion term determines, heat conduction model is established, and Temperature Distribution prediction model is repaiied
Just；
Step (1)：Conical friction element heat transfer process is analyzed；
Step (2)：Conical friction element temperature diffusion term determines；
Step (3)：Conical friction element heat conduction model is established；
Step (4)：Conical friction element Temperature Distribution prediction model amendment.
2. a kind of conical friction element Temperature Distribution predictor method according to claims, it is characterised in that：The step
Suddenly conical friction element heat conduction analysis in (1) mainly includes the effect definition of radius, the determination of load, friction coefficient really
Fixed, speed discrepancy determination, the determination for the heat flow that rubs.
3. a kind of conical friction element Temperature Distribution predictor method according to claims, it is characterised in that：The step
Suddenly conical friction element temperature diffusion term determines in (2), includes mainly cylindrical wall face converctive heat transfer boundary, annular oil groove wall surface
Converctive heat transfer boundary.
4. a kind of conical friction element Temperature Distribution predictor method according to claims, it is characterised in that：The step
Suddenly in (3) conical friction element heat conduction model establish, mainly include conical friction element three-dimension modeling, mesh generation,
Hot-fluid load applies, the setting of temperature diffusion term condition.
5. a kind of conical friction element Temperature Distribution predictor method according to claims, it is characterised in that：The step
Suddenly conical friction element Temperature Distribution prediction model amendment in (4) includes mainly the test of conical friction element node temperature, friction
The hot distribution coefficient amendment of contact surface.
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| CN201810992829.2A CN108763846A (en) | 2018-08-29 | 2018-08-29 | A kind of conical friction element Temperature Distribution predictor method |
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| CN201810992829.2A CN108763846A (en) | 2018-08-29 | 2018-08-29 | A kind of conical friction element Temperature Distribution predictor method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104200034A (en) * | 2014-09-10 | 2014-12-10 | 清华大学 | Dry sliding friction-heat-stress-abrasion sequential coupling simulation method |
| CN104268343A (en) * | 2014-09-28 | 2015-01-07 | 北京理工大学 | Method of cutting force prediction and temperature prediction for end-milling cutting |
| CN105956264A (en) * | 2016-04-28 | 2016-09-21 | 辽宁科技学院 | Temperature field simulated analysis method applied to multi-disk dry brake under comprehensive action of multiple physical fields |
| US20180142954A1 (en) * | 2015-06-05 | 2018-05-24 | Itt Italia S.R.L. | Method and plant for the thermal treatment of friction elements, in particular brake pads |
| CN108414105A (en) * | 2018-01-29 | 2018-08-17 | 北京航空航天大学 | A kind of dynamic temperature measurement method that the emulation secondary for dry friction is coupled with experiment |
-
2018
- 2018-08-29 CN CN201810992829.2A patent/CN108763846A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104200034A (en) * | 2014-09-10 | 2014-12-10 | 清华大学 | Dry sliding friction-heat-stress-abrasion sequential coupling simulation method |
| CN104268343A (en) * | 2014-09-28 | 2015-01-07 | 北京理工大学 | Method of cutting force prediction and temperature prediction for end-milling cutting |
| US20180142954A1 (en) * | 2015-06-05 | 2018-05-24 | Itt Italia S.R.L. | Method and plant for the thermal treatment of friction elements, in particular brake pads |
| CN105956264A (en) * | 2016-04-28 | 2016-09-21 | 辽宁科技学院 | Temperature field simulated analysis method applied to multi-disk dry brake under comprehensive action of multiple physical fields |
| CN108414105A (en) * | 2018-01-29 | 2018-08-17 | 北京航空航天大学 | A kind of dynamic temperature measurement method that the emulation secondary for dry friction is coupled with experiment |
Non-Patent Citations (1)
| Title |
|---|
| 陈遥飞: "湿式多片离合器热失效及摩擦特性研究", 《中国优秀博硕士学位论文全文数据库(硕士) 工程科技Ⅱ辑》 * |
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