汽車底盤零部件PPT課件

1、Structural Analysis Capabilities Normal Modes Dynamic Linear & Nonlinear Static Buckling Fatigue Crashworthiness第1頁/共36頁Examples:第2頁/共36頁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 sti

2、ffness 35 kN buckling第3頁/共36頁Boundary conditions Stiffness / BucklingStress analysisConstrained indof 1-3Constrained indof 2-4Forces and / or Moments第4頁/共36頁Lateral ForceAccelerationBrakingCorner第5頁/共36頁Base 4-Link Trailing Arm/ Wheel Carrier 5,4 kg (low weight) 6,2 kg (cost optimized) 6,9 kg第6頁/共36

3、頁Boundary conditions StiffnessStress analyseConstrained indof 1-3Constrained indof 2Constrained indof 2Constrained indof 2-3Forces and / or Moments第7頁/共36頁647 MPa579 MPaCornerVertical Force第8頁/共36頁Base 4-Link Upper Control Arm 2,1 kg (low weight) 2,7 kg (cost optimized) 30 kN/mm stiffness 20 kN buck

4、ling 1,94 kg 28 kN/mm stiffness27 kN bucklingthickness:3,0 mm shell2,0 mm bushingmaterial:S 355 MC第9頁/共36頁Boundary conditions Stiffness / BucklingStress analysisConstrained indof 1-3Constrained indof 2-4Forces and / or Moments第10頁/共36頁Calculated with linear elastic behavior of the material561 MPaPot

5、holeTwist第11頁/共36頁Base 4-Link Additional 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頁/共36頁Calculated with linear elastic behavior of the material694 MPaPotholeCorner turn

6、第13頁/共36頁Boundary conditions Stiffness / BucklingStress analysisConstrained indof 1-3Constrained indof 2-4Forces and / or Moments第14頁/共36頁 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

7、:4,0 mm material:S 355 MC第15頁/共36頁Boundary conditions Stiffness / BucklingStress analyseConstrained indof 1-6Constrained indof 1-6Forces and / or MomentsConstrained indof 1-6Constrained indof 1-6第16頁/共36頁CornerBraking第17頁/共36頁Uplevel H-Arm Lower Control Arm 6,8 kg (low weight) 9,5 kg (cost optimized

8、) 8,74 kg thickness:3 mm upper shell 2,5 mm lower shellmaterial:S 420 MC upper shellS 355 MC lower shell第18頁/共36頁Boundary conditions StiffnessStress analysisConstrained indof 3Constrained indof 3Forces and / or MomentsConstrained indof 2-3Constrained indof 1-3第19頁/共36頁Longitudinal ForceLateral Force

9、Braking第20頁/共36頁Validation RequirementsFront Suspension Lower 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頁/共36頁For All Cradles:Report at all bushing and ball joint centersSteering stif

10、fness shall be computed at the tie-relay ball with a rigid 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 Is

11、olated Cradles:Use GM Cradle on Mount Differential Stiffness 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 stif

12、fness.Validation RequirementsFront Suspension CrossmembersMethod for Computing Static Stiffness:DOF (1,2,3) locked第22頁/共36頁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

13、Crossmember 2.3mm HSLA 360 Engine support Front 2.5mm stw22 Re. Control Arm support 3mm stw22 第23頁/共36頁2. FEA Linear Load Cases ResultsREF. 132 190 65Units: MpaStanding Car1GVertical Load3.5GLongitudinal Load 2GLateral Load2GAccelerating0.5GBraking1.1GCornering1.2GBraking Turn1.05GFront Tube46.376.8

14、307.217.61.1270.233.264.Lateral Tubes22.064.6385.239.62.2395.246.240.Front Control 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 Front

15、121.073.1104.178.133.77.1196.80.Engine Support Rear45.673.1314.297.74.9332.328.162.第24頁/共36頁3. FEA Linear Load Cases PlotsLoad Case: 1G Standing CarREF. 132 190 65第25頁/共36頁Load Case: 3.5G Vertical Load3. FEA Linear Load Cases PlotsREF. 132 190 65第26頁/共36頁Load Case: 2G Longitudinal Load3. FEA Linear

16、Load Cases PlotsREF. 132 190 65第27頁/共36頁Load Case: 2G Lateral Load3. FEA Linear Load Cases PlotsREF. 132 190 65第28頁/共36頁Load Case: 0.5G Accelerating3. FEA Linear Load Cases PlotsREF. 132 190 65第29頁/共36頁Load Case: 1.1G Braking3. FEA Linear Load Cases PlotsREF. 132 190 65第30頁/共36頁Load Case: 1.2G Corne

17、ring3. FEA Linear Load Cases PlotsREF. 132 190 65第31頁/共36頁Load Case: 1.05G Braking Turn3. FEA Linear Load Cases PlotsREF. 132 190 65第32頁/共36頁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 Brac

18、ket Right.20.205.12.5614.4.295.Rear Control Arm Bracket Left27.7720.59.8820.5.295.Rear Control Arm Bracket 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 Stiffness Measurement Non Isolated BracketsREF. 132 190 65第33頁/共36頁Frequency (Hz.)DescriptionMo