CN108846231A - A method of CAE analysis is carried out for automotive back upward-acting door torsion stiffness - Google Patents
A method of CAE analysis is carried out for automotive back upward-acting door torsion stiffness Download PDFInfo
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- CN108846231A CN108846231A CN201810689322.XA CN201810689322A CN108846231A CN 108846231 A CN108846231 A CN 108846231A CN 201810689322 A CN201810689322 A CN 201810689322A CN 108846231 A CN108846231 A CN 108846231A
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- torsion stiffness
- back upward
- acting door
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- load
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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
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T17/00—Three dimensional [3D] modelling, e.g. data description of 3D objects
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2111/00—Details relating to CAD techniques
- G06F2111/04—Constraint-based CAD
Abstract
The present invention relates to a kind of methods for carrying out CAE analysis for automotive back upward-acting door torsion stiffness, and this method is to establish the threedimensional model of back upward-acting door, import in CAE software and carry out several cleanings and grid dividing to threedimensional model；Boundary, constraint and load are applied to threedimensional model；Given point position, finds out corresponding displacement, goes out torsion stiffness according to displacement calculation；Calculated torsion stiffness is compared with target value, determines whether it is qualified.The present invention can obtain to high efficiency, low cost the torsion stiffness of automotive back upward-acting door, avoid being carried out preferably with material object, reduction optimization repairs a die or even the time cost and expense cost of scrap mould.
Description
Technical field
The present invention relates to a kind of field of computer aided design, specifically a kind of to reverse for automotive back upward-acting door
The method of rigidity progress CAE analysis.
Background technique
Back upward-acting door is the important component of automobile, needs to guarantee enough torsions in enabling door closing procedure in design process
The problems such as rigidity, torsion stiffness deficiency will lead to Mode Problems and big torsional deflection.Mode is unreasonable to be caused to hold on back
The resonance of door generates noise, reduces the NVH performance of automobile.Torsional deflection conference causes easily to produce between back upward-acting door and vehicle body
Raw interference is collided with.Therefore need design the back upward-acting door of strict control early period torsion stiffness, avoid later development optimize and
The expense cost and time cost to repair a die.
The prior art often through empirical evaluation automotive back upward-acting door torsion stiffness, the precise degrees of torsion stiffness value by
To the influence of designer's experience level, it is difficult to form a set of general design preliminary analysis evaluation system.
Summary of the invention
Invention provides a kind of side that CAE analysis is carried out for automotive back upward-acting door torsion stiffness in order to solve the above problem
Method, which is characterized in that include the following steps：
Step 1：Back upward-acting door threedimensional model is established, imports in CAE software and GTD model is carried out to threedimensional model, grid is drawn
Point；
Step 2：Apply boundary constraint and load；
Step 3：Given point position, finds out corresponding displacement, according to displacement calculation torsion stiffness；
Step 4：It is compared with design object value, judges whether torsion stiffness is qualified.
Further, in the step 1, average-size is used to carry out grid dividing for the hexahedron solid element of 5mm；
Further, it the boundary that applies in the step 2 and is constrained to：Back upward-acting door is adjusted into the closing to installation condition
Position, body side hinge carry out staff cultivation, back upward-acting door line 100mm From Left, lower sideline using bolt hole RBE2 unit
The obligatory point that R10mm is chosen at 50mm constrains vehicle body front-rear direction freedom degree；
Further, load loads on load(ing) point in the step 2；The loading Position is back upward-acting door apart from the right
At line 100mm, lower sideline 50mm, the node of R10mm range is chosen；The magnitude of load is 200N；
Further, the point position given in the step 3 is identical as loading Position；
Further, the correspondence displacement of measuring point can pass through processing after having added constraint, having set up load in the step 3
Device is calculated to solve and be obtained；
Further, the calculating of torsion stiffness includes in the step 3：
Torsional deflection angle is：
In formula,αFor the windup-degree of load(ing) point, unit is degree（º）；dFor the correspondence displacement of measuring point, unit is millimeter（mm）；L
For obligatory point to measuring point（That is load(ing) point）Distance, unit is millimeter（mm）；
Torsion stiffness is：
In formula,kFor the torsion stiffness of back upward-acting door, the every degree of unit ox millimeter（N.mm/deg）；FIt loads and carries for Torque analysis
Lotus, units Newtons（N）.
Advantages of the present invention and effect are：The principle of the invention is simple, and computational efficiency and precision are high, can efficiently obtain vapour
The torsion stiffness of vehicle back upward-acting door avoids being carried out preferably with material object, and reduction optimization repairs a die or even the time cost of scrap mould
And expense cost.
Detailed description of the invention
Fig. 1 is flow chart of the invention；
Fig. 2 is back upward-acting door CAE analysis model；
Description of symbols：1, obligatory point, 2, load(ing) point, 3, bolt hole RBE2 unit.
Specific embodiment
The embodiments described below with reference to the accompanying drawings are exemplary, for explaining only the invention, and cannot be construed to
Limitation of the present invention：
S1：One piece of automotive back upward-acting door as shown in Figure 2, first established model, then established model is not being influenced
Simplify processing under the premise of analyzing result, imports in CAE software and carry out the division of GTD model and grid to threedimensional model, adopt
Grid dividing is carried out with the hexahedron solid element that average-size is 5mm.
S2：Back upward-acting door is adjusted into the closed position to installation condition, as shown in Fig. 2, body side hinge uses spiral shell
Keyhole RBE2 unit（3）Carry out staff cultivation, the pact of back upward-acting door line 100mm From Left, lower sideline 50mm place's selection R10mm
Beam spot（1）Constrain vehicle body front-rear direction freedom degree.
S3：Load(ing) point（2）Position is back upward-acting door at right side bearing 100mm, lower sideline 50mm, chooses R10mm model
The load(ing) point enclosed（2）Apply the outwardly directed concentrfated load F=200N of vehicle body front-rear direction.
S4：Point position is chosen, point position is and load(ing) point（2）Position is identical.
S5：It added constraint, set up after load is submitted through processor calculating solution, obtained measuring point corresponding displacement amountd。
S6：According to displacementdFind out torsion stiffness：
The Rigidity Calculation formula of back upward-acting door torsion stiffness analysis is calculated by the way of loading moment/deformation angle.
Torsional deflection angle is：
Wherein,αFor load(ing) point（2）Windup-degree, unit be degree（º）；dFor the correspondence displacement of measuring point, unit is millimeter
（mm）；LFor obligatory point（1）To measuring point（That is load(ing) point（2））Distance, unit is millimeter（mm）；
Torsion stiffness calculation formula is：
Wherein,kFor the torsion stiffness of back upward-acting door, the every degree of unit ox millimeter（N.mm/deg）；FIt loads and carries for Torque analysis
Lotus, units Newtons（N）.
S7：By calculated torsion stiffness and target value, judge whether torsion stiffness is qualified.
To keep the purposes, technical schemes and advantages of the embodiment of the present invention clearer, below with reference to the embodiment of the present invention
In attached drawing, technical solution in the embodiment of the present invention carries out clear and complete description：As shown in Figure 1：One kind being used for automobile
The method that back upward-acting door torsion stiffness carries out CAE analysis, mainly includes the following steps：Step 1：It is three-dimensional to establish back upward-acting door
Model imports in CAE software and carries out GTD model to threedimensional model, grid breaks up；Step 2：To model apply boundary, constraint and
Load；Step 3：Give one and load load(ing) point in step 2（2）The identical measuring point in position calculates through processor and obtains measuring point
Corresponding displacement amount, torsion stiffness is calculated according to corresponding displacement amount；Step 4：The torsion stiffness and target that calculating is acquired
Value compares, and judges whether qualification.Pass through empirical evaluation automotive back upward-acting door torsion stiffness, the present invention compared to traditional
Principle is simple, and computational efficiency and precision are high, carries out sunykatuib analysis to automotive back upward-acting door using the present invention, can be formed a set of logical
Design preliminary analysis evaluation system, avoid with material object carries out preferably, reduce optimization repair a die in addition scrap mould time at
Sheet and expense cost.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (7)
1. a kind of method for carrying out CAE analysis for automotive back upward-acting door torsion stiffness, which is characterized in that including following step
Suddenly：
Step 1：Back upward-acting door threedimensional model is established, imports in CAE software and GTD model is carried out to threedimensional model, grid is drawn
Point；
Step 2：Apply boundary constraint and load；
Step 3：Given point position, finds out corresponding displacement, according to displacement calculation torsion stiffness；
Step 4：It is compared with design object value, judges whether torsion stiffness is qualified.
2. a kind of method for carrying out CAE analysis for automotive back upward-acting door torsion stiffness according to claim 1, special
Sign is：In the step 1, average-size is used to carry out grid dividing for the hexahedron solid element of 5mm.
3. a kind of method for carrying out CAE analysis for automotive back upward-acting door torsion stiffness according to claim 2, special
Sign is：It the boundary that applies in the step 2 and is constrained to：Back upward-acting door is adjusted into the closed position to installation condition,
Body side hinge uses bolt hole RBE2 unit（3）Carry out staff cultivation, back upward-acting door line 100mm From Left, lower sideline
The obligatory point of R10mm is chosen at 50mm（1）Constrain vehicle body front-rear direction freedom degree.
4. a kind of method for carrying out CAE analysis for automotive back upward-acting door torsion stiffness according to claim 3, special
Sign is：Load loads on load(ing) point in the step 2（2）On；The load(ing) point（2）Position is back upward-acting door apart from the right
At line 100mm, lower sideline 50mm, the node of R10mm range is chosen；The magnitude of load is 200N.
5. a kind of method for carrying out CAE analysis for automotive back upward-acting door torsion stiffness according to claim 4, special
Sign is：The point position and load(ing) point given in the step 3（2）Position is identical.
6. a kind of method for carrying out CAE analysis for automotive back upward-acting door torsion stiffness according to claim 5, special
Sign is：The correspondence displacement of measuring point can be calculated after having added constraint, having set up load by processor in the step 3
Solution obtains.
7. a kind of method for carrying out CAE analysis for automotive back upward-acting door torsion stiffness according to claim 6, special
Sign is：The calculating of torsion stiffness includes in the step 3：
Torsional deflection angle is：
In formula,αFor load(ing) point（2）Windup-degree, unit be degree（º）；dFor the correspondence displacement of measuring point, unit is millimeter
（mm）；LFor obligatory point（1）To measuring point（That is load(ing) point（2））Distance, unit is millimeter（mm）；
Torsion stiffness is：
In formula,kFor the torsion stiffness of back upward-acting door, the every degree of unit ox millimeter（N.mm/deg）；FIt loads and carries for Torque analysis
Lotus, units Newtons（N）.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109829188A (en) * | 2018-12-19 | 2019-05-31 | 苏州奥杰汽车技术股份有限公司 | A kind of automotive back door opening force analysis method based on ADAMS |
| CN110008614A (en) * | 2019-04-15 | 2019-07-12 | 威马智慧出行科技（上海）有限公司 | White body torsion stiffness optimization method |
| CN114491815A (en) * | 2022-01-25 | 2022-05-13 | 岚图汽车科技有限公司 | Rigidity judgment method and device for automobile steering system, terminal device and medium |
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| CN104573174A (en) * | 2014-11-20 | 2015-04-29 | 华晨汽车集团控股有限公司 | CAE (computer aided engineering)-based car body rigidity analysis method |
| CN107247838A (en) * | 2017-06-07 | 2017-10-13 | 奇瑞汽车股份有限公司 | The light weight method and device of automotive back door |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109829188A (en) * | 2018-12-19 | 2019-05-31 | 苏州奥杰汽车技术股份有限公司 | A kind of automotive back door opening force analysis method based on ADAMS |
| CN110008614A (en) * | 2019-04-15 | 2019-07-12 | 威马智慧出行科技（上海）有限公司 | White body torsion stiffness optimization method |
| CN110008614B (en) * | 2019-04-15 | 2023-06-20 | 威马智慧出行科技（上海）有限公司 | Method for optimizing torsional rigidity of white car body |
| CN114491815A (en) * | 2022-01-25 | 2022-05-13 | 岚图汽车科技有限公司 | Rigidity judgment method and device for automobile steering system, terminal device and medium |
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Application publication date: 20181120 |