汽车 车身结构CAE 分析报告
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BODY CAE Loadcase Description
1. BIW
1.1 BIW static bending stiffness
1)
Model setup
The model comprises BIW with CMS front (in blue), front sub frame (in red), CMS rear (in yellow).
2)
Load and constraints
The force Fz creats a total of 4000N, and applied at the H points. Constraints location: 1) Middle of the crash beam;
2) Front suspension supports;
3) Rear subframe mouting points on the side member
3) Software Nastran. 4) Targets
The bending rocker stiffness is 11 200N/mm. 5)
Post
Calculation of deflection from vertical displacement indicated by reading points at 4000N:
w i=A,B = max. vertical displacement of reading points A and B (on rocker);
⎪
⎭
⎫ ⎝⎛+++-⎪⎭⎫ ⎝⎛+=42F E D C B A w w w w w w f
w i=C,D,E,F = vertical displacement of reading points C,D,E and F (on outer longitudinal member at X of front and rear axle).
1.2 BIW static torsion stiffness
1)
Model setup
The model comprises BIW with CMS front (in blue), front sub frame (in red), CMS rear (in yellow).
2)
Load and constraints
Pair of forces Fz creates a moment 1500N.m, and applied at front suspension supports. Constraints location: 1)Middle of the crash beam;
2)Rear subframe mouting points on the side member
3) Software Nastran. 4) Targets
The bending rocker stiffness is 16 000N/mm. 5)
Post
Calculation of angular distorsion from vertical displacement indicated by reading points A, B, C and D.
w i=A,B,C,D = vertical displacement of reading points (on outer longitudinal
member at X of front and rear axle);
I i=1,2 = distance between A and B, C and D
Torsion stiffness at 1500N.m:
f
F C z Bs 2=
⎪⎪⎭
⎫
⎝⎛--⎪⎪⎭⎫
⎝⎛-=21arctan arctan I w w I w w D C B A αα
t
T M C =
1.3 Front towing and shipping strength
1)Model setup
The model comprises hook, front bumper and the BIW related.
2)Load and constraints
The load follows the PSA standard, the information in detail is shown below.
3)Software
Abaqus
4)Targets
No permanent deformation (plastic strain < 0.5 %)
5)Post
Check the PEEQ against the target, and check whether there is interference between
the hook and the front bumper during the towing and shipping process.
1.4 Rear towing and shipping strength
1)Model setup
The model comprises hook, rear bumper and the BIW related.
2)Load and constraints
The load follows the PSA standard, the information in detail is shown below.
3)Software
Abaqus
4)Targets
No permanent deformation (plastic strain < 0.5 %)
5)Post
Check the PEEQ against the target, and check whether there is interference between
the hook and the rear bumper during the towring and shipping process.
1.5 BIW hanging strength
1)Model setup
There are three sub load cases considered in the painting shop, the angle respected to
the paringting line is 0º, -45ºand 45º, separately, the models for the front and rear
attachment points are shown below: