1. 1 Short-Long Arm Suspension GUI Familiarity Level Required: Lower Estimated Time Required: 40 minutes MSC.ADAMS 2005 r2

2. 2 Topics Covered In this tutorial you will learn how to: You will need to download SLA_Suspension_start.cmd to begin this tutorial If you have any difficulties, import the “SLA_Suspension_shortcut_1.cmd” file and proceed from pg 11 If you have any difficulties, import the “SLA_Suspension_shortcut_2.cmd” file and proceed from pg 13 If you have any difficulties, import the “SLA_Suspension_shortcut_3.cmd” file and proceed from pg 15 If you have any difficulties, import the “SLA_Suspension_shortcut_4.cmd” file and proceed from pg 17 If you have any difficulties, import the “SLA_Suspension_complete.cmd” file and proceed from pg 24 1.Create three-component force vector 2.Modify force vector 3.Create simple harmonic function 4.Create force vector 5.Create preloaded translational spring damper 6.Deactivate joint 7.Create bushings

3. 3 Short-Long Arm Suspension Problem Add bushings, translational spring damper and forces to a short-long arm suspension mechanism.

4. 4 What You Should Accomplish When you complete this tutorial you will have a working ADAMS model of a short-long arm suspension system.

5. 5 Importing Model a.Select Import a file radio button b.Click OK File Import window will open c.Right-click File To Read text field, select Browse d.Locate saved file SLA_Suspension_start.cmd e.Click Open f.Click OK a c d e f b

6. 6 Create Force Vector (Three-Component Force) a.Select Force Vector (Three-Component Force) from Forces tool stack b.Turn on damping coefficient (K) checkbox and enter (0.525Ne/m/sec ) c.Turn on stiffness coefficient (C) check box and enter (375Ne/mm) d.Click spindle  right click on center of tire and select patch  right click on center of tire and select patch.MAR130 a b d c

7. 7 Modify Marker a.Right-click force, select Marker: MARKER_151  Modify b.Enter 0.0, 0.0, 0.0 in Orientation text field c.Click OK c ba

8. 8Rename a.Right-click on force, select Force_Vector: VFORCE_1  Rename b.Enter.sla_complete.tire_compliance in New Name text field c.Click OK b a c

9. 9 Modify Force Vector a.Right Click on force, select Force_Vector: tire_compliance  Modify b.Enter 0 in X Force and Y Force text field c.Click button next to Z Force text field a b c

10. 10 Create Impact Function a.Enter: impact(DZ(vert_ref,contact_surface,ground.contact_patch), VZ(vert_ref,contact_surface,ground.contact_patch),290,375.0,1.01,0.525,3) into Define a runtime function text field b.Click OK a b

11. 11 Add Translational Joint Motion a.Select Translational Joint Motion from Motion Driver tool stack b.Click patch_to_ground (translational joint) c.Right-click on motion, select Motion: road_motion  Modify d.Click button next to Function (time) text field a b c d

12. 12 Create a Simple Harmonic Function a.Select Math Function from pull down menu b.Select Simple Harmonic c.Click Assist button d.Enter time in X text field e.Enter 0 in Shift text field f.Enter 3500d in Frequency text field g.Enter 90.0d in Phase Shift text field h.Enter 50 in Amplitude and Average value of Displacement text field i.Click OK j.Make sure the Define a runtime function text field reads: SHF(time, 0.0, 50.0, 3500.0d, 90.0d, 50.0) k.Click OK a b c j d e f g h i k

13. 13 Create Force (Single Component) a.Select force (Single Component) from Force tool stack b.Select Two Bodies from Run-time Direction pull down menu c.Click ground  lca  ground.POINT_7  lca.POINT_8 a b c

14. 14 Modify Force a.Rename force to.sla_complete.bump_stop b.Modify Force, click button next to Function text field c.Enter impact(DM(point_8, point_7),VR(point_8, point_7),51,5779,1.01,5.8,0.5) In Define a runtime function text field d.Click OK e.Click OK a d c b e

15. 15 Create Translational Spring Damper a.Select Translational Spring Damper from Force text field b.Click lca.POINT_6  ground_POINT_5 a b

16. 16 Modify Spring Damper a.Right-click spring, select Spring: SPRING_1  Modify b.Enter (60(newton/mm)) in Stiffness Coefficient text field c.Enter (0.46(nextown-sec/mm)) in Damping Coefficient d.Enter 0.0 Preload text field e.Enter (404mm) in Length at Preload text field f.Click OK a b c d e f

17. 17 Deactivate Joint a.Right-click revolute joint, select Joint: lca_to_ground  (De)activate b.Turn off Object Active and Object’s Dependents Active checkbox c.Click OK d.Repeat for Joint: uca_to_ground a b c d

18. 18 Create Bushing a.Select Bushings from forces tool stack b.Click uca  ground  ground.POINT_1 a b

19. 19 Modify Bushing a.Right click bushing, select Bushing: BUSHING_1  Modify b.Enter 2627.0, 2627.0, 876.0 in Stiffness text field c.Enter 1.75, 1.75,0. 875 in Damping text field d.Enter 0.0, 0.0, 0.0 in Preload, Stiffness, Damping and Preload text field e.Click OK a b c d e

20. 20 Create Bushings Create 3 more Bushings Bushing 1 & 2 Stiffness: 2627.0, 2627.0, 876.0 Damping: 1.75, 1.75, 0.875 Bushing 3 & 4 Stiffness: 3503.0, 3503.0, 1401.0 Damping: 2.62, 2.62, 1.4 1 2 3 4

21. 21Model This is what your screen should look like when your model is complete

22. 22 Create Point-to-Point Measure a.Click Build menu  Measure  Point-to-Point  New b.Right-click in To Point text field, select Marker  Browse c.Select sla_complete  spindle  wheel center d.Click OK a b c d

23. 23 Create Point-to-Point Measure a.Enter wheel_height in Measure Name text field b.Select spindle.wheel_center in To Point text field c.Select ground.wheel_center in From Point text field d.Verify that Translational displacement is selected from Characteristic pull down menu e.Select Z radio button from Component menu f.Click OK f e d c b a

24. 24 Verify Your Model Run simulation (Duration = 10, Step Size = 0.1) Verify your model, should have 11 degrees of freedom and no redundant constraints

25. 25 Topics Covered In this tutorial you will learn how to: 1.Create three-component force vector 2.Modify force vector 3.Create simple harmonic function 4.Create force vector 5.Create preloaded translational spring damper 6.Deactivate joint 7.Create bushings

26. 26 Best Practices Make sure all forces, joints and bushings are correctly oriented Make sure the functions are correctly set Verify the positions of joints, forces, bushings Check values of bushings, spring and force