Differences between Assembly Design and DMU Kinematics

The main difference between Assembly Design and Digital Mockup (DMU) Kinematics in CATIA is that Assembly Design is used to create static assemblies, while DMU Kinematics is used to create dynamic assemblies.

In Assembly Design, the parts are constrained together using geometric constraints, such as coincident, parallel, and perpendicular. This allows the assembly to be moved and rotated, but it does not allow the parts to move relative to each other.

In DMU Kinematics, the parts are connected together using kinematic joints, such as revolute, prismatic, and cylindrical joints. These joints allow the parts to move relative to each other in a specific way.

  1. Step 1: Side by Side view

    If you want to download the case study 3D models, you can find them at:


    I have created a Side by Side View to present the differences between these two workbenches.

    In general, Assembly Design is used for the early stages of the design process, when the focus is on creating a functional assembly. DMU Kinematics is used for the later stages of the design process, when the focus is on optimizing the performance of the assembly.

    The DMU Kinematics workbench also includes a number of tools for simulating the motion of assemblies. These tools can be used to analyze the kinematics of an assembly, to create animations of the assembly, and to perform clash detection.