汽车 车身结构CAE 分析报告

BODY CAE Loadcase Description1. BIW1.1 BIW static bending stiffness1)Model setupThe model comprises BIW with CMS front (in blue), front sub frame (in red), CMS rear (in yellow).2)Load and constraintsThe 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 member3) Software Nastran. 4) TargetsThe bending rocker stiffness is 11 200N/mm. 5)PostCalculation 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 fw 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 stiffness1)Model setupThe model comprises BIW with CMS front (in blue), front sub frame (in red), CMS rear (in yellow).2)Load and constraintsPair 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 member3) Software Nastran. 4) TargetsThe bending rocker stiffness is 16 000N/mm. 5)PostCalculation 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 longitudinalmember at X of front and rear axle);I i=1,2 = distance between A and B, C and DTorsion stiffness at 1500N.m:fF C z Bs 2=⎪⎪⎭⎫⎝⎛--⎪⎪⎭⎫⎝⎛-=21arctan arctan I w w I w w D C B A ααtT M C =1.3 Front towing and shipping strength1)Model setupThe model comprises hook, front bumper and the BIW related.2)Load and constraintsThe load follows the PSA standard, the information in detail is shown below.3)SoftwareAbaqus4)TargetsNo permanent deformation (plastic strain < 0.5 %)5)PostCheck the PEEQ against the target, and check whether there is interference betweenthe hook and the front bumper during the towing and shipping process.1.4 Rear towing and shipping strength1)Model setupThe model comprises hook, rear bumper and the BIW related.2)Load and constraintsThe load follows the PSA standard, the information in detail is shown below.3)SoftwareAbaqus4)TargetsNo permanent deformation (plastic strain < 0.5 %)5)PostCheck the PEEQ against the target, and check whether there is interference betweenthe hook and the rear bumper during the towring and shipping process.1.5 BIW hanging strength1)Model setupThere are three sub load cases considered in the painting shop, the angle respected tothe paringting line is 0º, -45ºand 45º, separately, the models for the front and rearattachment points are shown below:2)Load and constraintsThe load is calculated by MBS, considered the input for the MBS calculation, the mass of the model, which includes BIW, front & rear door, hood and trunk lid.3)SoftwareAbaqus4)TargetsNo permanent deformation (0.2%)5)PostCheck the PEEQ against the target.1.6 BIW jack strength1)Model setupCut BIW model to build up the models accordingly:BIW rear jack strength See picture 9150N Z+3)SoftwareAbaqus4)TargetsThe permanent displacement: <2mm5)PostCheck the permanent displacement against the target.1.7 BIW local stiffnessThere are three load cases needed to perform, fender Y local stiffness, fender Z localstiffness and the effect due to lamp fixation in the inner pannel.1.7.1 Fender Y local stiffness1)Model setup2)Load and constraints3)Software4)Targets5)Post1.7.2 Fender Z local stiffness1)Model setup2)Load and constraints3)Software4)Targets5)Post1.7.3 The effect due to lamp fixation in the inner pannel1)Model setupThe load case is performed based on the trunk lid with the equipment mass(shownbelow)2)Load and constraintsThe load due to the lamp fixation is added onto the model in the way of the torque,3)SoftwareAbaqus4)TargetsNot defined5)PostReview the stress due to the rear lamp fixation1.8 View mirrorFront vier mirror stiffness1)Model setup2)Load and constraints3)Software4)Targets5)Post。