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1、Structural Analysis CapabilitiesNormal ModesDynamicLinear&Nonlinear StaticBucklingFatigueCrashworthiness第1页/共36页Examples:第2页/共36页Base 4-Link Lower Control Arm 3,2 kg 56 kN/mm stiffness61 kN bucklingthickness:2,5 mmmaterial:S 355 MC 2,4 kg(low weight)3,2 kg(cost optimized)50 kN/mm stiffness 35 kN buc
2、kling第3页/共36页Boundary conditions Stiffness/BucklingStress analysisConstrained indof 1-3Constrained indof 2-4Forces and/or Moments第4页/共36页Lateral ForceAccelerationBrakingCorner第5页/共36页Base 4-Link Trailing Arm/Wheel Carrier 5,4 kg(low weight)6,2 kg(cost optimized)6,9 kg第6页/共36页Boundary conditions Stif
3、fnessStress analyseConstrained indof 1-3Constrained indof 2Constrained indof 2Constrained indof 2-3Forces and/or Moments第7页/共36页647 MPa579 MPaCornerVertical Force第8页/共36页Base 4-Link Upper Control Arm 2,1 kg(low weight)2,7 kg(cost optimized)30 kN/mm stiffness 20 kN buckling 1,94 kg 28 kN/mm stiffness
4、27 kN bucklingthickness:3,0 mm shell2,0 mm bushingmaterial:S 355 MC第9页/共36页Boundary conditions Stiffness/BucklingStress analysisConstrained indof 1-3Constrained indof 2-4Forces and/or Moments第10页/共36页Calculated with linear elastic behavior of the material561 MPaPotholeTwist第11页/共36页Base 4-Link Addit
5、ional Control Arm 0,28 kg(low weight)0,36 kg(cost optimized)100 kN/mm stiffness 39 kN buckling 0,34 kg 177 kN/mm stiffness38,6 kN bucklingthickness:1,5 mm material:S 355 MC第12页/共36页Calculated with linear elastic behavior of the material694 MPaPotholeCorner turn第13页/共36页Boundary conditions Stiffness/
6、BucklingStress analysisConstrained indof 1-3Constrained indof 2-4Forces and/or Moments第14页/共36页 1,3 kg(low weight)1,7 kg(cost optimized)25 kN/mm stiffness x 15 kN/mm stiffness yBase 4-Link Bracket 1,23 kg33 kN/mm stiffness x50 kN/mm stiffness ythickness:4,0 mm material:S 355 MC第15页/共36页Boundary cond
7、itions Stiffness/BucklingStress analyseConstrained indof 1-6Constrained indof 1-6Forces and/or MomentsConstrained indof 1-6Constrained indof 1-6第16页/共36页CornerBraking第17页/共36页Uplevel H-Arm Lower Control Arm 6,8 kg(low weight)9,5 kg(cost optimized)8,74 kg thickness:3 mm upper shell 2,5 mm lower shell
8、material:S 420 MC upper shellS 355 MC lower shell第18页/共36页Boundary conditions StiffnessStress analysisConstrained indof 3Constrained indof 3Forces and/or MomentsConstrained indof 2-3Constrained indof 1-3第19页/共36页Longitudinal ForceLateral ForceBraking第20页/共36页Validation RequirementsFront Suspension L
9、ower Control ArmsMethod for Computing Static Stiffness(Front Lower Control Arm):Reported at ball joint center at x-and y-directionbetween two connection points第21页/共36页For All Cradles:Report at all bushing and ball joint centersSteering stiffness shall be computed at the tie-relay ball with a rigid
10、bodyFor Non-Isolated Cradles:Steering should be attached rigid to the crossmemberFront crossmember to body interface center points should be pinned to ground allowing rotation about the(X,Y,Z)axis and no translation from these pointsFor Isolated Cradles:Use GM Cradle on Mount Differential Stiffness
11、Method with bushing rates(x=2KN/mm,y=2KN/mm,z=2KN/mm)Use steering bushing rates (x=10KN/mm,y=10KN/mm,z=1KN/mm).First calculation with an elastic cradle,second with a rigid cradle.Subtract the two displacements and calculate the stiffness.Validation RequirementsFront Suspension CrossmembersMethod for
12、 Computing Static Stiffness:DOF(1,2,3)locked第22页/共36页TOTAL MASS=21.85 Kg.Lateral Tubes 2.6mm DP500 Front Tube 2.25mm DP500 Fr.Control Arm brackets 3mm HR60 Attachments to Body 3.2mm stw22 Upper Crossmember 2.5mm HSLA 360 Lower Crossmember 2.3mm HSLA 360 Engine support Front 2.5mm stw22 Re.Control Ar
13、m support 3mm stw22 第23页/共36页2.FEA Linear Load Cases ResultsREF.132 190 65Units:MpaStanding Car1GVertical Load3.5GLongitudinal Load 2GLateral Load2GAccelerating0.5GBraking1.1GCornering1.2GBraking Turn1.05GFront Tube46.376.8307.217.61.1270.233.264.Lateral Tubes22.064.6385.239.62.2395.246.240.Front Co
14、ntrol Arm Bracket24.876.8568.213.96.3694.233.472.Upper Crossmember35.8134.465.334.73.1382.309.396.Lower Crossmember34.9189.530.541.146.493.566.438.Rear Control Arm Bracket11.747.0178.37.941.4255.55.1188.Engine Support Front121.073.1104.178.133.77.1196.80.Engine Support Rear45.673.1314.297.74.9332.32
15、8.162.第24页/共36页3.FEA Linear Load Cases PlotsLoad Case:1G Standing CarREF.132 190 65第25页/共36页Load Case:3.5G Vertical Load3.FEA Linear Load Cases PlotsREF.132 190 65第26页/共36页Load Case:2G Longitudinal Load3.FEA Linear Load Cases PlotsREF.132 190 65第27页/共36页Load Case:2G Lateral Load3.FEA Linear Load Cas
16、es PlotsREF.132 190 65第28页/共36页Load Case:0.5G Accelerating3.FEA Linear Load Cases PlotsREF.132 190 65第29页/共36页Load Case:1.1G Braking3.FEA Linear Load Cases PlotsREF.132 190 65第30页/共36页Load Case:1.2G Cornering3.FEA Linear Load Cases PlotsREF.132 190 65第31页/共36页Load Case:1.05G Braking Turn3.FEA Linear
17、 Load Cases PlotsREF.132 190 65第32页/共36页Units:KN/mmX DirectionTarget X Dir.Y DirectionTarget Y Dir.Z DirectionTarget Z Dir.Front Control Arm Bracket Left19.945.12.2614.4.065.Front Control Arm Bracket Right.20.205.12.5614.4.295.Rear Control Arm Bracket Left27.7720.59.8820.5.295.Rear Control Arm Brack
18、et Right27.5420.60.9720.5.5.Engine Support Front9.439.5.155.2.013.5Engine Support Rear33.3310.18.115.2.393.5Rack house Mount Left50.7625.55.2425.8.408.Rack house Mount Right48.6825.55.5525.7.468.Stabilizer Bar Mount Left52.6310.34.485.13.4216.Stabilizer Bar Mount Right51.2810.30.585.12.8816.4.Static
19、 Stiffness Measurement Non Isolated BracketsREF.132 190 65第33页/共36页Frequency(Hz.)DescriptionMode 1 to 60.Rigid Body MovesMode 793.2First Torsion ModeMode 8153.85-Mode 9169.86First Crossmember bending ModeMode 10253.65First Lateral Tubes bending ModeMode 11321.0-Mode 12329.9-Mode 13366.9-6.Modal Analysis FREE FREE ConfigurationREF.132 190 65第34页/共36页Thank you!第35页/共36页感谢您的观看。第36页/共36页