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Projectile

Estimated time required: 20 min

GUI familiarity level required: Higher

MSC.ADAMS 2005 r2

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Topics CoveredTopics Covered

If you have any difficulties, import the “projectile_complete.cmd” file and proceed from pg 10

In this tutorial, you will learn how to:

1. Set initial translational velocities

2. Creating point-to-point measure

3. Create an angle measure

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A projectile is launched with an initial speed of 200 m/s at an angle of 60 degrees with respect to the horizontal. Compute the range R as measured up the incline.

Problem 2/79 from J. L. Meriam and L. G. Kraige, Engineering Mechanics: Volume 2, Dynamics 3rd edition. John Wiley & Sons, Inc.

Copyright © 1992, by John Wiley & Sons, Inc. This material is used by permission of John Wiley & Sons, Inc.

ProjectileProjectile

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If you are successful, you should end up with a ADAMS model of a projectile.

What You Should AccomplishWhat You Should Accomplish

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a. Start ADAMS.

b. Create a new model. (Model Name = projectile, Units = mks, Gravity = -y earth)

c. Reset working grid to 2000m x 1500m with spacing of 50m and zoom out.

d. Create incline (box, length = 3500 m, rotated 20 degrees, on ground)

e. Create projectile (sphere, radius = 1 m), place at lower end of incline. Rename .projectile.SPHERE

Creating the ModelCreating the Model

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a. Right-click on sphere, select Part: SPHERE Modifty

b. Select User Input from Define Mass By drop down menu

c. Enter 10.0 for Mass, Ixx, Iyy and Izz

d. Click Apply

e. Select Velocity Initial Conditions from Category drop down menu

f. Turn on X axis check box and enter (200 * COS(60))

g. Turn on Y axis check box and enter (200 * SIN(60))

h. Click OK

Set Initial Translational VelocitySet Initial Translational Velocity

a

b

c

d

f

e

gd

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Set a point-to-point measure between the projectile and the end of the incline.

a. Click Build Measure Point-to-Point New

b. Enter Range_along_Incline in Measure Name text field

c. In To Point text field select MARKER_2

d. In From Point text field select MARKER_1

e. Verify that Translational displacement is selected for the Characteristic drop down menu

f. Select mag radio button for Component

g. Click OK

Create a Point-to-Point MeasureCreate a Point-to-Point Measure

a

b

cd

e

f

g

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Create an Angle MeasureCreate an Angle Measure

a. Select Included angle between two vectors tool from Measures tool stack

b. Click SPHERE.cm ground.MARKER_1 (0.0, 0.0, 0.0)

c. Click Edit menu Rename

d. Select MEA_ANGLE_1

e. Enter .projectile.Height_of_Projectile

f. Click OK

a

c d

e

f

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

ModelModel

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TestTest

a. Run simulation (Duration = 30, Step Size = 0.01)

b. Determine the time step when the projectile encounters the inclined plane using the animation tool.

c. Transfer small plot to full plot and go to the ADAMS plotting screen.

d. On the full plot, use the display plot statistics function and X value on the Height_of_Projectile curve when Y=0, then find the Y value on the Range_Along_Incline curve to determine the range.

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Theoretical Solution ADAMS solution

ResultsResults

Flight Time = 27.91s

Range = 2969.7

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In this tutorial you learned how to:

Topics CoveredTopics Covered

1. Set initial translational velocities

2. Creating point-to-point measure

3. Create an angle measure

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Best PracticesBest Practices

• Make sure correct units are set to mks and the viewing area is zoomed out enough to see the model.

• Make sure gravity is on and in the -y direction and set to 9.80615.

• Make sure the inclined plane is rotated in the correct direction (z, counterclockwise).

• Make sure the inclined plane is locked to the ground.

• Check dimensions of the part to make sure they are correct.

• Make sure the measures are set correctly. Make sure the plot is displaying the correct set of results.

• Make sure there are enough output steps to observe the contact between the projectile and the inclined plane.