Monday, May 8, 2017

DMU Kinematics

Assalamualaikum and very good day.

For those who are trying out DMU kinematics to complete projects or for free learning, in general, there are few different approaches that end up with the same result.

That is, if you guys have downloaded Dick Sham tutorial about excavator kinematics, it explains a different approach that also works. In such a way that, you need to have your constraints selection managed very well in Assembly Design, and then use the Automatic Conversion tool in DMU Kinematics to convert from constraints to joints in DMU Kinematics.

Another approach is to apply the contraints in DMU Kinematics. Below are the steps:

1. Open your Assembly file in Assembly Design Workbench.
2. Switch to DMU Kinematics.

3. In DMU Kinematics, select icon for Fixed Part, by creating a new mechanism in the appeared window, and selecting part that will be fixed/ not moving, and this will start with a different trees  under the history tree.

4. Next, Hide all the parts except the fixed part and part that will be connected to the fixed part which will moving related to your projects.

5. By selecting proper constraints such as (revolute, cylindrical, planar,..etc), in the Kinematics Joints use any of this command to create contraints between your moving part and your fix part. Hover your mouse and read the tips under the bottom left corner for explainations.

6. Apply commands to the constraints, usually shown by angle, or distance.

7. And when you click OK, if a window appear and saying that "Your simulation can  be simulated", so, you have succeed to simulate your first simulation.

8. Use simulation icon in DMU kinematics to manipulate your catia parts.

9. Next, use Rigid icon in constraints, and rigid the parts with either the fixed part or parts that are moving together.

10. Capture your animation with video capture software otherwise it will have a huge data to capture if use Video Capture Tool in catia software.

For a conclusion, there are few criterias that you need to accomplish that are:

1) At least 1 Fixed part is needed.
2) At least 1 Kinematics Joint is needed.
3) At least 1 Command is needed.

And start with few parts first and add other parts one at a time. You can aslo learn for how DOF (degree of freedom) effects your kinematics to success. And you also can search for CATIA V5 Kinematics Help in google as well.

Below is a good sample on how this approach is used to do kinematics in catia v5.