1. Fix Redundant Constraints With Revolute, Spherical, and Hooke Joint.
GUI Familiarity Level Required: Higher
Estimated Time Required: 10 minutes
MSC.ADAMS 2005 r2

2. Topics Covered In this tutorial you will learn how to:
Import .cmd file
Add spherical joint
Add hooke joint
Fix redundant constraints
You will need to download the file “4-bar_redundant_constraint.cmd“ to begin this tutorial
If you have any difficulties, import the “4-bar_redundant_constraint_complete.cmd” file and proceed from pg 8

3. Fix Redundant Constraints Problem
As the model is defined, there are 3 redundant restraints. The use of different types of joints yield a model with 0 DOF which allows for kinematics simulation while avoiding redundant constraints, which is good modeling practice.

4. What You Should Accomplish
If you are successful you should end up with a working ADAMS model that has no redundant constraints.

5. Importing a command file (.cmd)
Select Import a file radio button
Click OK a b
File Import window will open
Right-click File To Read text field, select Browse
Locate saved file 4-bar_redundant_constraint
Click Open
Click OK d c e f

6. Add Spherical Joint
Right-click on JOINT_2, select Joint: JOINT_2, select Delete a
Right-click Joint tool stack. Select Spherical joint
Set Construction text fields to 1 Location and Normal To Grid
Click PART_2.MARKER_2 d b c

7. Add Hooke Joint Delete JOINT_3
Right-click Joint tool stack. Select Spherical joint
Set Construction text fields to 1Location and Normal To Grid
Click PART_3.MARKER_4
Click on the cm (center of mass) of Part_2
Click on the cm of PART_3 b d e f c

8. Verify
Verify your model. There should be 0 Degrees of Freedom and no redundant constraints

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

10. Topics Covered In this tutorial, you learned how to: Import .cmd file
Add spherical joint
Add hooke joint
Fix redundant constraints

11. Best Practices
Check orientation of spherical joint
Check orientation of hooke joint, it should be along the cm of the two parts.
Remove unnecessary joints
Verify your model.