Impulsive Force GUI Familiarity Level Required: Lower Estimated Time Required: 20 minutes

1. Impulsive Force GUI Familiarity Level Required: Lower Estimated Time Required: 20 minutes MSC.ADAMS 2005 r2

2. Topics Covered In this tutorial you will learn how to: • Create cylinder • Create frustum • Add revolute joint • Add torsional spring with stiffness and damper • Add single component force • Create point measure • Verify model If you have any difficulties, import the “Impulsive_Force_shortcut.cmd” file and proceed from pg 8 If you have any difficulties, import the “Impulsive_Force_complete.cmd” file and proceed from pg 13

3. Impulsive Force Problem This example uses an inverted pendulum to show the effects of an impulsive force. A torsional spring-damper supports the pendulum while a single-component force acting on the free end contains an impulse approximation.

4. What You Should Accomplish When you complete this tutorial you will have an ADAMS model illustrating impulse force.

5. Create Cylinder • Start ADAMS • Create a New Model (Model Name = Impulsive_Force, Gravity = Earth Normal (-Y), Units = MMKS) • Select Cylinder from Rigid Body tool stack • Turn on Length check box and enter (300mm) in text field • Turn on Radius check box and enter (37.5mm) in text field • Click point (150, 0, 0) • Click in the Global positive Y direction c d f e

6. Create Frustum • Click Frustum from rigid body tool stack • Select Add to Part from Frustum pull down menu • Turn on Length check box and enter (150.0mm) in text field • Turn on Bottomradius check box and enter (CYLINDER_1.radius) in text field • Turn on Top radius check box and enter (5mm) in text field • Click Part 2  PART_2.CTLINDER_1.E1 (center) Click in Global Positive Y direction a f b c d e

7. Add Revolute Joint • Select Revolute joint from joint tool stack • Select 1 Location from Construction pull down menu • Click PART_2.MARKER_1 a b c

8. Add Torsional Spring with Stiffness and Damper • Select Torsional Spring from forces tool stack • Select 1 Location from Construction pull down menu • Turn on Stiffness Coefficient (KT) checkbox and enter (4.0E+004(newton-mm/deg)) in text field • Turn on Damping Coefficient (CT) checkbox and enter (10(newton-mm-sec/deg)) in text field • Click PART_2.MARKER_1 a a a a a

9. Add Single Component Force • Select Force (Single-Component) from force tool stack • Click PART_2  PART_2.FRUSTRUM_2.E2 (center)  (250, 450, 0) b a

10. Modify Force a b • Right click force, select Force: SFORCE_1  Modify • Click button next to Function text field • Enter • STEP(TIME, 2.0, 0.0, 2.1, +500) + STEP(TIME, 2.1, 0.0, 2.2, -500) • Click OK c d

11. Create Point Measure b c a d • Right click tip of frustum, select Marker: MARKER_7  Measure • Select Force on Point from Characteristic pull down menu • Select mag radio button for Component • Click OK

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

13. Verify Your Model Verify your model, should have 1 degrees of freedom and no redundant constraints Run simulation (Duration = 3, Step Size = 0.1)

14. Results

15. Topics Covered In this tutorial you will learn how to: • Create cylinder • Create frustum • Add revolute joint • Add torsional spring with stiffness and damper • Add single component force • Create point measure • Verify model

16. Best Practices • Make sure units are mmks • Make sure dimensions are correct • Make sure that the revolute joint and torsional spring are have correct location and orientation • Make sure that the force is in the right direction • Make sure that the force function is correct • Verify your model