CN104573174B - A kind of body stiffness analysis method based on CAE - Google Patents
A kind of body stiffness analysis method based on CAE Download PDFInfo
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Abstract
The present invention relates to computer-aided engineering (CAE) technical field, and in particular to a kind of body stiffness analysis method based on CAE, for analyzing the front longitudinal of vehicle body, threshold and the bending stiffness and torsional rigidity of floor side member, including：Establish vehicle body FEM mesh and coordinate system, simulation test is carried out by applying loading and constraint, obtain result, and formation curve, then judge whether result meets to require, result is preserved if meeting to require, otherwise re-establishes vehicle body FEM mesh to re-start simulation test.In the present invention, by the displacement and windup-degree of vehicle body FEM mesh analysis node to carry out stiffness analysis, calculated without choosing node by experience, it is as a result more accurate；Analysis result is automatically obtained, alleviates the workload of engineer, saves the project development time；Result can be zeroed, make result specification, as a result compatibility is strong, is easy to comparative analysis.
Description
Technical field
The present invention relates to computer-aided engineering (CAE) technical field, and in particular to a kind of body stiffness based on CAE point
Analysis method, for analyzing the front longitudinal of vehicle body, threshold and the bending stiffness and torsional rigidity of floor side member.
Background technology
The bending stiffness and torsional rigidity of passenger vehicle body are the resistance bending and turn round that vehicle body is shown in static stand under load
Change the ability of shape, for weighing license deformation of the vehicle in normally travel.The modern passenger cars overwhelming majority uses bearing-type
Body structure, the various load during use are born, such as torsion, bending and impact load.In the effect of these load
Under, the stiffness characteristics of vehicle body have very important effect.If body stiffness is insufficient, doorframe, window frame, hood can be caused
Mouthful and the deformation such as luggage case opening it is big, cause stuck car door, glass breaking, it is poorly sealed phenomena such as.Therefore, in the design process
It must take into consideration the deformation of vehicle body integral rigidity and key position.Due to body stiffness attribute testing can not be carried out in the early stage of the project
When, so sunykatuib analysis must be carried out by CAE simulation meanses, to ensure the rigidity property of vehicle body.
The process of traditional body stiffness CAE linear analysis methods is：Car body model is established based on CAE；Modeling is completed
Car body model afterwards is loaded and constrained, to simulate time of day of the Car body model in vehicle；Rule of thumb choose section
Point；Car body model is applied and loaded, the displacement of analysis node and windup-degree；Then in order to obtain the maximum displacement value of node,
Whether deformation extent and investigation Car body model tiled configuration are symmetrical, it is desirable to the curve of the left and right sides is established, including for bending
Rigidity establishes displacement curve, and windup-degree curve is established for torsional rigidity.
There are the following problems for this method：If choosing less node, the reduction of curve precision can be made, cusp be present, simultaneously
Maximum displacement point may be missed, causes Rigidity Calculation result inaccurate；If chosen compared with multinode, need to choose vehicle body longitudinal direction
A cribbing point, number of nodes about at 800 to 1000 or so, it is necessary to engineer rule of thumb manually choose and count one by one
Calculate, not only increase project development time, and waste of manpower cost；The loading Position that operation is chosen every time is different, during operation
The result recorded after the information of record and operation is lack of standardization.These problems cause cost height, result poor compatibility, are not easy to
Same vehicle body contrasts between measurement result and different automobile types measurement result for several times.
The content of the invention
The present invention solves the existing body stiffness analysis method cost height based on CAE, result poor compatibility, is not easy to
The problem of same vehicle body contrasts between measurement result and different automobile types measurement result for several times.
In order to solve the above technical problems, the present invention provides following technical scheme：
A kind of body stiffness analysis method based on CAE, for analyzing the bending stiffness and torsional rigidity of vehicle body, including：
Step 101：Vehicle body FEM mesh is established, establishes three-dimensional system of coordinate so that the X-axis of three-dimensional system of coordinate is parallel
In vehicle body FEM mesh Longitudinal extending direction, Y-axis extends laterally direction parallel to vehicle body FEM mesh；
Step 102：Symmetrical two grid lines are chosen from vehicle body FEM mesh, every grid lines is indulged in the past
Liang Qi, floor side member is reached after threshold, and using each node on two selected grid lines as test point；
Step 103：Each Seat-fixed point into vehicle body FEM mesh applies loading, while limited to vehicle body
Four shock absorber mounting points in first grid model apply free degree constraint, then record X-coordinate and the Z axis side of each test point
To displacement as the first result；
Step 104：Two front damper mount points into vehicle body FEM mesh apply moment of torsion, while to vehicle body
Y-coordinate is that zero node, two rear shock absorber mount points apply frees degree constraint on front beam in FEM mesh, then
Record X-coordinate, the Y-coordinate l of each test pointy, Z-direction displacement dzWith windup-degree α as second processing result, wherein, α
=tan-1(dz/ly)；
Step 105：X-coordinate-Z-direction displacement curve is established according to the first result；Built according to second processing result
Vertical X-coordinate-windup-degree curve；
Step 106：Judge whether the first result meets to require, judge whether second processing result meets to require；Such as
Fruit is satisfied by, then performs step 107, otherwise exports X-coordinate-Z-direction displacement curve and X-coordinate-windup-degree curve, so as to
The lookup of carry out problem；
Step 107：Preserve the first result and second processing result.
X-coordinate-Z-direction displacement curve is established in preferable scheme, in step 105 to specifically include：
Carry out a rezero operation so that test point i has new shift value Zni, new shift value Zni, test point i zero before Z
Direction of principal axis displacement ZiAnd front damper corresponds to the Z-direction displacement Z of test point0Between relation be：Zni=Zi-Z0, wherein,
The X-coordinate that front damper corresponds to test point is identical with the X-coordinate of front damper mount point, a net in two grid lines
On ruling；
Then, secondary rezero operation is carried out to all test points so that test point i X-coordinate is Pmi, Z-direction displacement
For Zmi, meet Zmi=Znicosα1-Pxisinα1And Pmi=Pxicosα1+Znisinα1；Wherein α1=tan-1(dr/Pr), drTo be rear
Damper corresponds to the Z-direction displacement of test point, and rear shock absorber corresponds to the X-coordinate P of test pointrWith the X of rear shock absorber mount point
Coordinate is identical, on a grid lines in two grid lines, PxiFor X-coordinate of the test point i before a rezero operation；Before
Damper corresponds to test point and rear shock absorber corresponds to test point on same grid lines is carried；
Then, draw X using X-coordinate and Z-direction displacement as reference axis according to the result of secondary rezero operation and sit
Mark-Z-direction displacement curve.
Judge whether the first result meets that requirement specifically includes in preferable scheme, in step 106：
Current test point i bending stiffness BS is calculated according to the result of secondary rezero operationi, then judge when front curve is firm
Spend BSiWhether satisfaction allows bending stiffness to require, wherein, BSi=F/ (fi+fj), F be loading size, fiFor test point i Z
Direction of principal axis maximum displacement；fjFor with Z-direction maximum displacements of the test point i on the symmetrical test point j of X-axis.
X-coordinate-windup-degree curve is established in preferable scheme, in step 105 to specifically include：
Return-to-zero is carried out to the windup-degree in second processing result so that the torsion of the test point i after return-to-zero
Angle [alpha]miFor αmi=αni-αr, wherein, αniFor the windup-degree before return-to-zero, αrThe zero of test point is corresponded to for rear shock absorber
The windup-degree of before processing, rear shock absorber corresponds to the X-coordinate of test point and the X of rear shock absorber mount point in second processing result
Coordinate is identical, and on a grid lines in two grid lines.
In preferable scheme, whether second processing result meets that requirement specifically includes in step 106：
Current test point i torsional rigidity TS is calculated according to the result of windup-degree return-to-zeroi, then judge current turn round
Turn whether rigidity meets to allow torsional rigidity to require, wherein, TSi=T/ (αi1+αj2), T be apply torque, αi1To survey
Pilot i windup-degree, αj2For with windup-degrees of the test point i on the symmetrical test point j of X-axis.
The invention provides the body stiffness analysis method based on CAE, vehicle body FEM mesh is carried out loading and
Constraint, the displacement of analysis node and windup-degree, calculated without choosing node by experience, it is as a result more accurate；Automatically
Analysis result is obtained, alleviates the workload of engineer, saves the project development time；Result can be zeroed, make result
Standardization, as a result compatibility is strong, is easy to same vehicle body to be contrasted for several times between measurement result and different automobile types measurement result.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, it will use below required in embodiment
Accompanying drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for ability
For the those of ordinary skill of domain, on the premise of not paying creative work, it can also be obtained according to these accompanying drawings other attached
Figure.
Fig. 1 is the flow chart of body stiffness analysis method of the embodiment of the present invention based on CAE.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.Based on this
Embodiment in invention, the every other reality that those of ordinary skill in the art are obtained under the premise of creative work is not made
Example is applied, belongs to the scope of protection of the invention.
Flow chart shown in Figure 1, the present embodiment are provided by means of MSC/NASTRAN softwares and HyperWorks softwares
Second development interface, based on TCL (Tool Command Language) language, there is provided a kind of body stiffness analysis method based on CAE, be used for
The bending stiffness and torsional rigidity of vehicle body are analyzed, including：
Step 101：Vehicle body FEM mesh is established, establishes three-dimensional system of coordinate so that the X-axis of three-dimensional system of coordinate is parallel
In vehicle body FEM mesh Longitudinal extending direction, Y-axis extends laterally direction parallel to vehicle body FEM mesh；
Step 102：Symmetrical two grid lines are chosen from vehicle body FEM mesh, every grid lines is indulged in the past
Liang Qi, floor side member is reached after threshold, and using each node on two selected grid lines as test point；Two
Node on grid lines is symmetrical on X-axis；
Step 103：Each Seat-fixed point into vehicle body FEM mesh applies loading, while limited to vehicle body
Four shock absorber mounting points in first grid model apply free degree constraint, then record X-coordinate and the Z axis side of each test point
To displacement as the first result；For example, each Seat-fixed point applies the loading that size is 1000N；Two preceding dampings
Device mount point is symmetrical on X-axis, and two rear shock absorber mount points are symmetrical on X-axis；
Step 104：Two front damper mount points into vehicle body FEM mesh apply moment of torsion, while to vehicle body
Y-coordinate is that zero node, two rear shock absorber mount points apply frees degree constraint on front beam in FEM mesh, then
Record X-coordinate, the Y-coordinate l of each test pointy, Z-direction displacement dzWith windup-degree α as second processing result, wherein, α
=tan-1(dz/ly)；Loading and constraint in step 103 are independent of each other independently of the loading and constraint in step 104；For example,
Apply the moment of torsion that size is 1500N/m to each front damper；
Step 105：X-coordinate-Z-direction displacement curve is established according to the first result；Built according to second processing result
Vertical X-coordinate-windup-degree curve；I.e.：Curve is established as reference axis using X-coordinate and Z-direction displacement, or with X-coordinate and torsion
Gyration establishes curve as reference axis；
Step 106：Judge whether the first result meets to require, judge whether second processing result meets to require；Such as
Fruit is satisfied by, then performs step 107, otherwise exports X-coordinate-Z-direction displacement curve and X-coordinate-windup-degree curve, so as to
The lookup of carry out problem；I.e.：Judge Z-direction displacement and windup-degree α whether in defined displacement range and windup-degree model
In enclosing, or judged after calculating bending stiffness and torsional rigidity as described below；
Step 107：Preserve the first result and second processing result.
Preferably, X-coordinate-Z-direction displacement curve is established in step 105 to specifically include：
Carry out a rezero operation so that test point i has new shift value Zni, new shift value Zni, test point i once returns
Z-direction displacement Z before Z-operationiAnd front damper corresponds to the Z-direction displacement Z of test point0Between relation be：Zni=Zi-
Z0, wherein, the X-coordinate that front damper corresponds to test point is identical with the X-coordinate of front damper mount point, in two grid lines
A grid lines on；Within a context, i, j number for test point, can be natural numbers；It is corresponding with front damper mount point
Test point has two, and selection here is one of to be corresponded to test point as front damper and calculated, equally from rear shock absorber
One is selected in test point corresponding to mount point as rear shock absorber and corresponds to test point；Once-through operation position translation；
Then, secondary rezero operation is carried out to all test points so that test point i X-coordinate is Pmi, Z-direction displacement
For Zmi, meet Zmi=Znicosα1-Pxisinα1And Pmi=Pxicosα1+Znisinα1；Wherein α1=tan-1(dr/Pr), drTo be rear
Damper corresponds to the Z-direction displacement of test point, and rear shock absorber corresponds to the X-coordinate P of test pointrWith the X of rear shock absorber mount point
Coordinate is identical, on a grid lines in two grid lines, PxiFor X-coordinate of the test point i before a rezero operation；Before
Damper corresponds to test point and rear shock absorber corresponds to test point on same grid lines is carried；Secondary behaviour's rezero operation position rotation behaviour
Make；
Then, draw X using X-coordinate and Z-direction displacement as reference axis according to the result of secondary rezero operation and sit
Mark-Z-direction displacement curve.
Preferably, judge whether the first result meets that requirement specifically includes in step 106：
Current test point i bending stiffness BS is calculated according to the result of secondary rezero operationi, then judge when front curve is firm
Spend BSiWhether satisfaction allows bending stiffness to require, wherein, BSi=F/ (fi+fj), F be loading size, fiFor test point i Z
Direction of principal axis maximum displacement；fjFor with Z-direction maximum displacements of the test point i on the symmetrical test point j of X-axis.
Preferably, X-coordinate-windup-degree curve is established in step 105 to specifically include：
Return-to-zero is carried out to the windup-degree in second processing result so that the torsion of the test point i after return-to-zero
Angle [alpha]miFor αmi=αni-αr, wherein, αniFor the windup-degree before return-to-zero, αrThe zero of test point is corresponded to for rear shock absorber
The windup-degree of before processing, rear shock absorber corresponds to the X-coordinate of test point and the X of rear shock absorber mount point in second processing result
Coordinate is identical, and on a grid lines in two grid lines.
Preferably, whether second processing result meets that requirement specifically includes in step 106：
Current test point i torsional rigidity TS is calculated according to the result of windup-degree return-to-zeroi, then judge current turn round
Turn whether rigidity meets to allow torsional rigidity to require, wherein, TSi=T/ (αi1+αj2), T be apply torque, αi1To survey
Pilot i windup-degree, αj2For with windup-degrees of the test point i on the symmetrical test point j of X-axis.
In summary, the present invention efficiently can easily realize that vehicle body bending stiffness, torsional rigidity automatically analyze, and shorten
In the project development cycle, important foundation is provided for project preliminary evaluation body stiffness performance, has been prevented due to body stiffness not
The deformations such as foot, caused doorframe, window frame, hood mouth and luggage case opening are big, cause stuck car door, glass breaking, sealing
Not tight phenomenon.
The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited thereto, any
Those familiar with the art the invention discloses technical scope in, change or replacement can be readily occurred in, should all be contained
Cover within protection scope of the present invention.
Claims (5)
1. a kind of body stiffness analysis method based on CAE, for analyzing the bending stiffness and torsional rigidity of vehicle body, its feature exists
In, including：
Step 101：Vehicle body FEM mesh is established, establishes three-dimensional system of coordinate so that the X-axis of three-dimensional system of coordinate is parallel to car
Body FEM mesh Longitudinal extending direction, Y-axis extend laterally direction parallel to vehicle body FEM mesh；
Step 102：Symmetrical two grid lines are chosen from vehicle body FEM mesh, every grid lines is from front longitudinal
Rise, floor side member is reached after threshold, and using each node on two selected grid lines as test point；
Step 103：Each Seat-fixed point into vehicle body FEM mesh applies loading, while to vehicle body finite element net
Four shock absorber mounting points in lattice model apply free degree constraint, then record X-coordinate and the Z-direction position of each test point
Shifting is used as the first result；
Step 104：Two front damper mount points into vehicle body FEM mesh apply moment of torsion, while limited to vehicle body
Y-coordinate is zero node, two rear shock absorber mount points application free degree constraints on front beam in first grid model, is then recorded
X-coordinate, Y-coordinate ly, Z-direction displacement dz and the windup-degree α of each test point as second processing result, wherein, α=
tan-1(dz/ly)；
Step 105：X-coordinate-Z-direction displacement curve is established according to the first result；X is established according to second processing result to sit
Mark-windup-degree curve；
Step 106：Judge whether the first result meets to require, judge whether second processing result meets to require；If
Meet, then perform step 107, X-coordinate-Z-direction displacement curve and X-coordinate-windup-degree curve are otherwise exported, to carry out
The lookup of problem；
Step 107：Preserve the first result and second processing result.
2. the body stiffness analysis method based on CAE according to claim 1, it is characterised in that X seats are established in step 105
Mark-Z-direction displacement curve specifically includes：
Carry out a rezero operation so that test point i has new shift value Zni, new shift value Zni, test point i zero before Z axis side
The Z-direction displacement Z of test point is corresponded to displacement Zi and front damper0Between relation be：Zni=Zi-Z0, wherein,
The X-coordinate that front damper corresponds to test point is identical with the X-coordinate of front damper mount point, and one in two grid lines
On bar grid lines；
Then, secondary rezero operation is carried out to all test points so that test point i X-coordinate is Pmi, Z-direction displacement is Zmi,
Meet Zmi=Znicosα1-Pxisinα1And Pmi=Pxicosα1+Znisinα1；Wherein α1=tan-1(dr/Pr), dr is rear shock absorber
The Z-direction displacement of corresponding test point, rear shock absorber correspond to the X-coordinate P of test pointrWith the X-coordinate phase of rear shock absorber mount point
Together, on a grid lines in two grid lines, Pxi is X-coordinate of the test point i before a rezero operation；Preceding damping
Device corresponds to test point and rear shock absorber corresponds to test point on same grid lines；
Then, X-coordinate-Z is drawn using X-coordinate and Z-direction displacement as reference axis according to the result of secondary rezero operation
Direction of principal axis displacement curve.
3. the body stiffness analysis method based on CAE according to claim 2, it is characterised in that first is judged in step 106
Whether result meets that requirement specifically includes：
Current test point i bending stiffness BS is calculated according to the result of secondary rezero operationi, then judge current flexural stiffness BSi
Whether satisfaction allows bending stiffness to require, wherein, BSi=F/ (fi+fj), F be loading size, fiFor test point i Z axis side
To maximum displacement；fjFor with Z-direction maximum displacements of the test point i on the symmetrical test point j of X-axis.
4. the body stiffness analysis method based on CAE according to claim 1, it is characterised in that X seats are established in step 105
Mark-windup-degree curve specifically includes：Return-to-zero is carried out to the windup-degree in second processing result so that after return-to-zero
Test point i windup-degree αmiFor αmi=αni-αr, wherein, αniFor the windup-degree before return-to-zero, αrFor rear shock absorber
Windup-degree before the return-to-zero of corresponding test point, in second processing result rear shock absorber correspond to test point X-coordinate and
The X-coordinate of rear shock absorber mount point is identical, and on a grid lines in two grid lines.
5. the body stiffness analysis method based on CAE according to claim 4, it is characterised in that second processing in step 106
As a result whether meet that requirement specifically includes：
Current test point i torsional rigidity TS is calculated according to the result of windup-degree return-to-zeroi, then judge current reverse just
Spend and whether meet to allow torsional rigidity to require, wherein, TSi=T/ (αi1+αj2), T be apply torque, αi1For test point i
Windup-degree, αj2For with windup-degrees of the test point i on the symmetrical test point j of X-axis.
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