汽车车身结构cae分析报告.docx

BODY CAE Loadcase Description BIW 1.1 BIW static bending stiffness Model setup The model comprises BIW with CMS front (in blue), front sub frame (in red), CMS rear (in yellow). 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 Software Nastran. Targets The bending rocker stiffness is 11 200N/mm. Post Calculation of deflection from vertical displacement indicated by reading points at 4000N: wi=A,B = max. vertical displacement of reading points A and B (on rocker); wi=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 Model setup The model comprises BIW with CMS front (in blue), front sub frame (in red), CMS rear (in yellow). 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 Software Nastran. Targets The bending rocker stiffness is 16 000N/mm. Post Calculation of angular distorsion from vertical displacement indicated by reading points A, B, C and D. wi=A,B,C,D = vertical displacement of reading points (on outer longitudinal member at X of front and rear axle); Ii=1,2 = distance between A and B, C and D Torsion stiffness at 1500N.m: 1.3 Front towing and shipping strength Model setup The model comprises hook, front bumper and the BIW related. Load and constraints The load follows the PSA standard, the information in detail is shown below. Software Abaqus Targets No permanent deformation (plastic strain 0.5 %) Post Check the PEEQ against the target, and check whether there is inter