1. Flexible Link in Four-Bar
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 a Marker
Create a Link
Create a Revolute joint
Add a Motion
Replace a Rigid Link with a Flexible Link
Reposition part
If you have any difficulties, import the “flexible_link_shortcut.cmd” file and proceed from pg 10
If you have any difficulties, import the “flexible_four_bar_complete.cmd” file and proceed from pg 13

3. Flexible Link in Four Bar Problem
Replace a flexible link in the four bar mechanism so that the driver link is able to move 360°

4. What You Should Accomplish
If you are successful you should end up with a working ADAMS model that has a flexible link, that has a driver link is able to rotate 360°

5. Create New Model Getting Started:
a. Under the heading "How would you like to proceed", select the Create a new model radio button.
b. Choose a Location to save your files
c. Choose Model Name as model_1 (default)
d. Verify the Gravity text field is set to Earth Normal (-Global Y).
e. Verify that the Units text field is set to MMKS - mm,kg,N,s,deg.
f. Select OK. a b c d e f

6. Create Marker Click on the View menu, select Coordinate Window
Right-click Rigid Body tool stack. Select the Marker tool
Click on the point (-300,0,0) b c a
Create Markers at:
d. (-250, 250, 0)
e. (250, 250, 0)
f. (250, 100, 0) d e f

7. Create Link Right-click Rigid Body tool stack. Select the Link tool
Click ground.Marker_1
Click ground.Marker_2 a c b d
Create Link between Marker_2 and Marker_3
Create Link between Marker_3 and Marker_4 e

8. Add a Revolute Joint
Right-click on the Joint tool stack in the Main Toolbox, select Joint: Revolute tool.
Set the Construction option menu to 1 Location and Normal to Grid.
Left-click on the marker ground.MARKER_1 .
A joint between the cylinder and the ground is created at that location. a b c d
Create a revolute joint at:
e. Marker_2
f. Marker_3
g. Marker_4 f e g

9. Add Motion
Add a rotational motion driver to the revolute joint that specifies a constant cam rotation of one revolution per second.
Select Rotational Joint Motion from the Motion Driver tool stack
In the Speed text field, enter (30.0d) to set the motion displacement to be 30 degrees/second.
Left-click on the Joint_4. a c b

10. Replacing Rigid Link with Flexible Link
Click Build menu, select Flexible Bodies, select Rigid To Flex
Right-click in Current part text field, select Part  Pick
Click on PART_3 b c a
Right click in MNF File text field  Click Browse  search for link.mnf d

11. Reposition
Right-click on flexible body, select Flexible_Body: PART_3_flex  Modify
Click Location button
Enter ({-250.0, 250.0, 0.0} + {0.0, 0.0, 0.0}) in location text field
Click OK a b a c d

12. Revolute Joint
Replace revolute joints at MARKER_2 and MARKER_3, because the joint is not aligned properly when you swap in the flexible link 2 3

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

14. Topics Covered In this tutorial you will learn how to: Create a Marker
Create a Link
Create a Revolute joint
Add a Motion
Replace a Rigid Link with a Flexible Link
Reposition part

15. Best Practices
Check the position of the links
Check the orientation of the joints
Make sure the joints are correctly connected
Check the orientation of the flexible body
Check the speed of the added motion
For C++ solver this model works fine
For Fortran solver needed to change solver setting, select corrector as “modified” in Dynamics category