CN107967387A - A kind of Finite Element Design of automobile flexural pivot work torque - Google Patents
A kind of Finite Element Design of automobile flexural pivot work torque Download PDFInfo
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- CN107967387A CN107967387A CN201711212749.2A CN201711212749A CN107967387A CN 107967387 A CN107967387 A CN 107967387A CN 201711212749 A CN201711212749 A CN 201711212749A CN 107967387 A CN107967387 A CN 107967387A
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- flexural pivot
- finite element
- automobile
- ball pin
- torque
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/15—Vehicle, aircraft or watercraft design
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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
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
Abstract
The present invention provides a kind of Finite Element Design of automobile flexural pivot work torque, includes the following steps：S1, creates automobile flexural pivot geometrical model in finite element software；S2, the material parameter of the ball pin seat defined in finite element software；S3, definition ball pin is interarea, ball pin seat is from face, defines friction coefficient according to flexural pivot lubricating grease cone penetration, sets minimum axial direction power size；S4, grid division, solves to obtain rotating torque analog result and shaking moment analog result by finite element software；S5, carries out work torque test experiments to the actual automobile flexural pivot of similarity condition, obtains rotating torque experimental result and shaking moment experimental result；S6, the correctness of verification automobile flexural pivot work torque finite element model.The present invention can shorten the construction cycle of automobile flexural pivot product, save the making of flexural pivot laboratory sample and test repeatedly, have and improve development efficiency, effectively reduce outstanding advantages of development cost.
Description
Technical field
The present invention relates to automobile flexural pivot technology of new products design and exploder field, more particularly, to a kind of automobile flexural pivot work torque
Finite Element Design.
Background technology
The structure of automobile flexural pivot is as shown in Figure 1, mainly include ball pin 1, ball pin seat 2 and ball pin set 3, the work of automobile flexural pivot
Torque includes shaking moment and rotating torque, is the important performance characteristic of automobile flexural pivot.
At present, designing and developing for automobile flexural pivot class product, in terms of being also concentrated mainly on Experience Design, i.e., by a large amount of
Test data analyzed and optimized structure.This work torque and the experiment designed and developed mode and cause to simulate
Having a long way to go between data, it is differed 200%, even more, and acceptable typical set value is typically 7% left
It is right.Therefore, construction cycle and the development cost of automobile flexural pivot class product are necessarily increased, reduces opening for automobile flexural pivot class product
Send out efficiency.
The content of the invention
The technical problem to be solved in the present invention is：In view of the problems of the existing technology, there is provided a kind of automobile flexural pivot work
The Finite Element Design of torque, shortens the construction cycle of automobile flexural pivot product, reduces development cost.
The technical problem to be solved in the present invention is realized using following technical scheme：A kind of automobile flexural pivot work torque has
Meta design method is limited, the automobile flexural pivot includes ball pin, ball pin seat and ball pin set, includes the following steps：
S1, creates the geometrical model of automobile flexural pivot in finite element software；
S2, the material parameter of the ball pin seat defined in finite element software, the material parameter include density, surrender pressure resistance
Degree, elasticity modulus and Poisson's ratio；
S3, definition ball pin is interarea, ball pin seat is from face, defines friction coefficient according to flexural pivot lubricating grease cone penetration, sets
Minimum axial direction power size；
S4, the grid division in finite element software, solves automobile flexural pivot work torque by finite element software, is rotated
Torque analog result and shaking moment analog result；
S5, according to the parameter set when being simulated in finite element software to automobile flexural pivot, to the reality under similarity condition
Automobile flexural pivot carry out work torque test experiments, obtain rotating torque experimental result and shaking moment experimental result；
S6, according to flexural pivot work torque analog result and experimental result between relative error whether setting range with
It is interior, the correctness of verification automobile flexural pivot work torque finite element model.
Preferably, the geometrical model of the automobile flexural pivot is directly to carry out threedimensional model in ABAQUS finite element softwares to build
Mould.
Preferably, the geometrical model of the automobile flexural pivot is that to first pass through Solidworks or Inventor three dimensional designs soft
Part is modeled, then the modeler model is imported into ABAQUS finite element softwares.
Preferably, when setting minimum axial direction power size, carry out as follows：
Before ball pin set sleeving and riveting closes up, its outside diameter r is surveyed1, after sleeving and riveting closing in, survey its border outside diameter r2, calculate
Axially loaded area S during ball pin set sleeving and riveting closing in, the S calculation formula are：
S=π (r1 2-r2 2)；
The calculation formula of minimum axial direction power is：
F=σ S；
Wherein, σ is the yield strength of ball pin set.
Preferably, the ball pin seat grid uses C3D8R.
Preferably, the ball pin seat grid is arranged to adaptive mesh.
Preferably, the ball pin is arranged to rigid body, its grid uses C3D4.
Preferably, if the rotating torque experimental result and shaking moment experimental result is by being carried out to automobile flexural pivot
Dry group of work torque experiment, records corresponding machine survey i.e. survey rotating torque, machine and surveys i.e. survey shaking moment, then obtain respectively respectively
Its average value, respectively as rotating torque experimental result when finally verifying, shaking moment experimental result.
Compared with prior art, the beneficial effects of the invention are as follows：The automobile flexural pivot finite element model established by the present invention,
Simulation calculation can be carried out to automobile flexural pivot work torque according to finite element model parameter, then according to simulation result optimization design
Carry out Optimized model size, until meeting the requirement of automobile flexural pivot design performance, so as to shorten the exploitation of automobile flexural pivot product week
Phase, saves the making of flexural pivot laboratory sample and tests repeatedly, drastically increase the development efficiency of automobile flexural pivot class product, and have
Reduce development cost to effect.
Brief description of the drawings
Fig. 1 is the tectonic model schematic diagram of automobile flexural pivot.
Axially loaded areal calculation schematic diagram (ball pin set forced area schematic diagram) when Fig. 2 is automobile flexural pivot sleeving and riveting.
Marked in figure：1- ball pins, 2- ball pin seats, 3- ball pin sets.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, below in conjunction with the accompanying drawings and specific implementation
The present invention is described in detail for example.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, not
For limiting the present invention.
A kind of Finite Element Design of automobile flexural pivot work torque, the structure of automobile flexural pivot therein is as shown in Figure 1, bag
Include ball pin 1, ball pin seat 2 and ball pin set 3.Specifically,
1st step, creates automobile flexural pivot geometrical model.Threedimensional model can be directly carried out in the finite element softwares such as ABAQUS
Modeling, can also first pass through the special Three-dimensional Design Software of such as Solidworks, Inventor and be modeled, then this is modeled
Model is imported into the finite element softwares such as ABAQUS.
2nd step, definition material parameter.Ball pin seat 2 is arranged to flexible body, ball pin 1 is arranged to rigid body, and ball pin set 3 is set
For display body, it is not involved in calculating.
In the present embodiment, the material of the ball pin 1 is 40Cr, and the material of ball pin set 3 is 20# steel, the ball pin seat 2
It is the formant of stress analysis, its material is polyformaldehyde, its material parameter is：Density is 1.42g/cm3, surrender compression strength
For 123.48MPa, elasticity modulus 3050MPa, Poisson's ratio 0.2.
3rd step, definition contact attribute.Required according to the definition of contact surface, rigidity is big for interarea, therefore defines ball pin 1
For interarea, ball pin seat 2 is from face.According to the actual conditions of automobile Spherical Joint Motion, ball pin 1 has the rotation and swing of larger angle,
Its sphere-contact attribute uses limited sliding.Friction coefficient μ is defined according to flexural pivot lubricating grease cone penetration, for example, flexural pivot lubricates
When fat cone penetration is 265~295, its corresponding friction coefficient μ is set as 0.043.
4th step, sets the size of minimum axial direction power.In view of in flexural pivot product final assemble, sleeving and riveting receipts are carried out to ball pin set 3
Mouth is exactly the process for applying axial load to ball pin seat 2 and 1 spherical pair of ball pin, therefore, can ignore work of the radial load to torque
With influence, and only consider effect of the axial force to torque.According to the actual conditions of flexural pivot sleeving and riveting closing in process, and pass through power transmission
Conservation is calculated, the size of the minimum axial direction power thus set.The size of minimum axial direction power obtained by the calculating, is having
It is used to define boundary condition in limit meta software.
The sleeving and riveting of flexural pivot, which closes up, is divided into three processes：Sleeving and riveting, pressurize, backhaul, wherein, pressure maintaining period is just to maintain minimum axis
Xiang Li.Calculating for minimum axial direction power, is to cover 3 sleeving and riveting closing in actual conditions according to ball pin, transmits conservation by power and is counted
Calculate.
Specifically, as shown in Fig. 2, ball pin set 3 surveys its outside diameter r before sleeving and riveting closing in1, it is real after sleeving and riveting closing in
Survey its border outside diameter r2.Then the axially loaded areal calculation formula during the closing in of 3 sleeving and rivetings of ball pin set is：
S=π (r1 2-r2 2)
The calculation formula of minimum axial direction power is：
F=σ S
Wherein, σ is the yield strength of ball pin set.
After the specific material of setting ball pin set 3, by consulting the corresponding material properties of the specific material, you can learn it
Yield strength σ.For example, set ball pin set 3 specific material as 20# steel, by the material properties for consulting 20# steel, you can learn
Its yield strength is that σ is 245Mpa.
σ, S are substituted into the calculation formula of minimum axial direction power, you can obtain minimum axial direction power F, minimum axial direction power F passes through coupling
Close to set and act on the contact surface of ball pin seat 2 and ball pin 1.Automobile flexural pivot is under preferable mated condition, the bulb contact of ball pin 1
Region is consistent with 2 contact area of ball pin seat.
It should be noted that since drawing for minimum axial direction power F is actually calculated as a result, rather than soft by finite element
Part is drawn.Therefore, the 4th above-mentioned step, the actual order of the 3rd step can be adjusted according to custom.
5th step, grid division.2 grid cell of ball pin seat is the main stress element that finite element solving calculates, and needs emphasis point
Analysis.2 grid of ball pin seat uses C3D8R, i.e. Three-Dimensional 8-node Reduced Integral unit, size of mesh opening 0.3mm.Ball pin 1 and ball pin seat
The range of movement of 2 Contact Pairs is larger, and to prevent mesh torsion, 2 grid of ball pin seat is arranged to adaptive mesh.Ball pin 1 is set
For rigid body, its grid uses C3D4, i.e., three-dimensional 4 node units.
6th step, submits JOB, solves automobile flexural pivot work torque by finite element software, respectively obtains rotating torque simulation
As a result with shaking moment analog result.The rotating torque analog result, shaking moment analog result are exactly simulated automotive ball
Cut with scissors the work torque in practical work process.
In automobile flexural pivot practical work process, the velocity of rotation of ball pin 1, swing speed are usually 15-30 °/s, therefore,
When carrying out flexural pivot work simulation using finite element software, it is 2.40Nm to obtain corresponding rotating torque numerical value, is obtained corresponding
Shaking moment numerical value is 1.85Nm.
7th step, according to the parameter set when being simulated in finite element software to automobile flexural pivot, to the reality under similarity condition
The automobile flexural pivot on border carries out work torque test experiments, respectively obtains rotating torque experimental result and shaking moment experimental result.
In order to ensure rotating torque experimental result, the reliability of shaking moment experimental result, accuracy, typically to some
Actual automobile flexural pivot under the similarity condition of group carries out work torque experiment, records corresponding machine respectively and surveys i.e. survey rotatory force
Square, machine, which are surveyed, surveys shaking moment, then obtains its average value respectively, to test knot as rotating torque during final verification
Fruit, shaking moment experimental result.
In the present embodiment, select the actual automobile flexural pivot under 8 groups of similarity conditions and carry out work torque experiment, test experiments
Data are referring to following table：
8th step, interpretation of result, whether the relative error between the analog result and experimental result of analysis flexural pivot work torque
Within 7%, to verify the correctness of automobile flexural pivot work torque finite element model.It should be noted that：When calculating, simulation
As a result the difference between experimental result should take its absolute value.
If relative error, the analog result of shaking moment and reality between the analog result and experimental result of rotating torque
The relative error between result is tested within 7%, that is, demonstrates the correctness of automobile flexural pivot work torque finite element model.
1st, the analog result of rotating torque differs percentage K1 with experimental result and is：
2nd, the analog result of shaking moment differs percentage K2 with experimental result and is：
It can be seen from the above that K1, K2 be within 7%, i.e. phase between the analog result and experimental result of flexural pivot work torque
To error within 7%, the correctness of automobile flexural pivot work torque finite element model is demonstrated.
After automobile flexural pivot performance parameter determines, minimum axial direction power just has determined.For setting for automobile flexural pivot class product
Meter exploitation, the work torque that the automobile flexural pivot finite element model established using the present invention can be to automobile flexural pivot, which optimizes, to be set
Meter, without coordinating flexural pivot sample experiments to carry out the design of the work torque of automobile flexural pivot by Experience Design.
, can be according to identified finite element model parameter to vapour in the automobile flexural pivot finite element model that the present invention establishes
Car flexural pivot work torque carries out simulation calculation；Then, according to simulation result optimization design come Optimized model size, work after such as emulating
Make torque and be more than performance requirement, the small grease of replaceable friction coefficient or increase ball pin, ball pin seat, ball pin Analysis of Nested Design size,
Flexural pivot geometrical model is re-established, emulation meter is carried out to automobile flexural pivot work torque again according to definite finite element model parameter
Calculate, continuous iteration, until meeting the requirement of automobile flexural pivot design performance.
It can be seen from the above that being optimized using work torque of the present invention to automobile flexural pivot, it can not only shorten automobile
The construction cycle of flexural pivot product, and save the making of flexural pivot laboratory sample and test repeatedly, therefore, drastically increase vapour
The development efficiency of car flexural pivot class product, and significantly reduce development cost.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, it is noted that all
All any modification, equivalent and improvement made within the spirit and principles in the present invention etc., should be included in the guarantor of the present invention
Within the scope of shield.
Claims (8)
1. a kind of Finite Element Design of automobile flexural pivot work torque, the automobile flexural pivot include ball pin (1), ball pin seat (2)
With ball pin set (3), it is characterised in that：Include the following steps：
S1, creates the geometrical model of automobile flexural pivot in finite element software；
S2, the material parameter of the ball pin seat defined in finite element software (2), the material parameter include density, surrender pressure resistance
Degree, elasticity modulus and Poisson's ratio；
S3, definition ball pin (1) is interarea, ball pin seat (2) is from face, and friction coefficient is defined according to flexural pivot lubricating grease cone penetration, if
Determine minimum axial direction power size；
S4, the grid division in finite element software, solves automobile flexural pivot work torque by finite element software, obtains rotating torque
Analog result and shaking moment analog result；
S5, according to the parameter set when being simulated in finite element software to automobile flexural pivot, to the actual vapour under similarity condition
Car flexural pivot carries out work torque test experiments, obtains rotating torque experimental result and shaking moment experimental result；
S6, according to the relative error between the analog result and experimental result of flexural pivot work torque whether within setting range,
Verify the correctness of automobile flexural pivot work torque finite element model.
2. the Finite Element Design of automobile flexural pivot work torque according to claim 1, it is characterised in that：The automobile
The geometrical model of flexural pivot is that threedimensional model modeling is directly carried out in ABAQUS finite element softwares.
3. the Finite Element Design of automobile flexural pivot work torque according to claim 1, it is characterised in that：The automobile
The geometrical model of flexural pivot is to first pass through Solidworks or Inventor Three-dimensional Design Softwares to be modeled, then by the modeling mould
Type is imported into ABAQUS finite element softwares.
4. the Finite Element Design of automobile flexural pivot work torque according to claim 1, it is characterised in that：In setting most
During small axial force size, carry out as follows：
Before the closing in of ball pin set (3) sleeving and riveting, its outside diameter r is surveyed1, after sleeving and riveting closing in, survey its border outside diameter r2, calculate
Axially loaded area S during the closing in of ball pin set (3) sleeving and riveting, the S calculation formula are：
S=π (r1 2-r2 2)；
The calculation formula of minimum axial direction power is：
F=σ S；
Wherein, σ is the yield strength of ball pin set.
5. the Finite Element Design of automobile flexural pivot work torque according to claim 1, it is characterised in that：The ball
Key seat (2) grid uses C3D8R.
6. the Finite Element Design of automobile flexural pivot work torque according to claim 1, it is characterised in that：The ball
Key seat (2) grid is arranged to adaptive mesh.
7. the Finite Element Design of automobile flexural pivot work torque according to claim 1, it is characterised in that：The ball
Pin (1) is arranged to rigid body, its grid uses C3D4.
8. the Finite Element Design of automobile flexural pivot work torque according to claim 1, it is characterised in that：Described turns
Kinetic moment experimental result and shaking moment experimental result are tested by carrying out some groups of work torques to automobile flexural pivot, are remembered respectively
Record corresponding machine and survey i.e. survey rotating torque, machine survey i.e. survey shaking moment, its average value is then obtained respectively, respectively as most final acceptance inspection
Rotating torque experimental result, shaking moment experimental result during card.
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Cited By (2)
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| CN109408891A (en) * | 2018-09-25 | 2019-03-01 | 浙江工业大学 | A kind of automobile spherical hinge structure design method merging production technology |
| CN112685925A (en) * | 2019-10-18 | 2021-04-20 | 比亚迪股份有限公司 | Method and device for establishing model, storage medium and electronic equipment |
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| CN107203668A (en) * | 2017-05-23 | 2017-09-26 | 四川望锦机械有限公司 | A kind of automobile spherical hinge structure design method based on CAE |
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- 2017-11-28 CN CN201711212749.2A patent/CN107967387A/en active Pending
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| CN107203668A (en) * | 2017-05-23 | 2017-09-26 | 四川望锦机械有限公司 | A kind of automobile spherical hinge structure design method based on CAE |
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| 花荣: "汽车转向拉杆球头摩擦系统的特种润滑剂研究", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》 * |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109408891A (en) * | 2018-09-25 | 2019-03-01 | 浙江工业大学 | A kind of automobile spherical hinge structure design method merging production technology |
| CN112685925A (en) * | 2019-10-18 | 2021-04-20 | 比亚迪股份有限公司 | Method and device for establishing model, storage medium and electronic equipment |
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Application publication date: 20180427 |