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

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Impulsive Force

GUI Familiarity Level Required: LowerEstimated Time Required: 20 minutes

MSC.ADAMS 2005 r2

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Topics CoveredTopics Covered

In this tutorial you will learn how to:

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

1. Create cylinder

2. Create frustum

3. Add revolute joint

4. Add torsional spring with stiffness and damper

5. Add single component force

6. Create point measure

7. Verify model

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Impulsive Force ProblemImpulsive 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.

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What You Should AccomplishWhat You Should Accomplish

When you complete this tutorial you will have an ADAMS model illustrating

impulse force.

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Create CylinderCreate Cylindera. Start ADAMS

b. Create a New Model (Model Name = Impulsive_Force, Gravity = Earth Normal (-Y), Units = MMKS)

c. Select Cylinder from Rigid Body tool stack

d. Turn on Length check box and enter (300mm) in text field

e. Turn on Radius check box and enter (37.5mm) in text field

f. Click point (150, 0, 0)

g. Click in the Global positive Y direction

c

d

e f

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Create FrustumCreate Frustuma. Click Frustum from rigid body tool stack

b. Select Add to Part from Frustum pull down menu

c. Turn on Length check box and enter (150.0mm) in text field

d. Turn on Bottom radius check box and enter (CYLINDER_1.radius) in text field

e. Turn on Top radius check box and enter (5mm) in text field

f. Click Part 2 PART_2.CTLINDER_1.E1 (center) Click in Global Positive Y direction

a

b

c

d

e

f

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Add Revolute JointAdd Revolute Joint

a. Select Revolute joint from joint tool stack

b. Select 1 Location from Construction pull down menu

c. Click PART_2.MARKER_1

a

b

c

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Add Torsional Spring with Stiffness and DamperAdd Torsional Spring with Stiffness and Dampera. Select Torsional Spring from forces tool stack

b. Select 1 Location from Construction pull down menu

c. Turn on Stiffness Coefficient (KT) checkbox and enter (4.0E+004(newton-mm/deg)) in text field

d. Turn on Damping Coefficient (CT) checkbox and enter (10(newton-mm-sec/deg)) in text field

e. Click PART_2.MARKER_1

a a

aa

a

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Add Single Component ForceAdd Single Component Forcea. Select Force (Single-Component) from force tool stack

b. Click PART_2 PART_2.FRUSTRUM_2.E2 (center) (250, 450, 0)

b

a

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Modify ForceModify Force

a. Right click force, select Force: SFORCE_1 Modify

b. Click button next to Function text field

c. Enter

STEP(TIME, 2.0, 0.0, 2.1, +500) + STEP(TIME, 2.1, 0.0, 2.2, -500)

d. Click OK

a

b

c

d

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Create Point MeasureCreate Point Measure

a. Right click tip of frustum, select Marker: MARKER_7 Measure

b. Select Force on Point from Characteristic pull down menu

c. Select mag radio button for Component

d. Click OK

a

b

c

d

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ModelModel

This is what your screen should look like whenyour model is complete

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Verify Your ModelVerify Your Model

Run simulation (Duration = 3, Step Size = 0.1)

Verify your model, should have 1 degrees of freedom and no redundant constraints

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ResultsResults

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Topics CoveredTopics Covered

In this tutorial you will learn how to:

1. Create cylinder

2. Create frustum

3. Add revolute joint

4. Add torsional spring with stiffness and damper

5. Add single component force

6. Create point measure

7. Verify model

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Best PracticesBest 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