Compute Craig Bampton model reduction using structural PDE toolbox of MATLAB (FEM SuperElements - Component Mode Synthesis)

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Is it possible to extract a reduced model (also called Superelement) using Craig-Bampton technique (also called Component Mode Synthesis) from a structural model in PDE toolbox?

Accepted Answer

Alberto Mora
Alberto Mora on 24 Jun 2020
Edited: Alberto Mora on 2 Mar 2021
It seems that with the 2020a release, Mathworks introduced the superelements!
You can find the documentation here.
If you have interesting suggestion, please, share here for other users. Thank you.
Alberto Mora
Alberto Mora on 27 Mar 2021
I think that you should import your geometry using standard format (like STL or STEP), then mesh it, and finally perform craig-bampton method as in the example. Or you can also import directly the mesh if you already created it in a third-part software. Have a look around MATLAB ANSWER and MATLAB documentation that is full of these info.
Regards, A

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More Answers (1)

Ravi Kumar
Ravi Kumar on 17 Jan 2019
Hi Alberto,
I see have asked this question a while ago, hope it is still relevant to you. Could you elaborate your use case a bit more?
How would you like to set up the mode? Do you want to set up the problem using StructuralModel approach for analysis and then instead of calling solve, do you want to call some other function that would reduce the model and return an output that is not the solution for a specific loading?
What all do you expect as a part of reduced model, like Component modes, Fixed-Interface modes, degree-of-freedom mapping to boundary etc.?
Alberto Mora
Alberto Mora on 18 Jan 2019
Dear Ravi,
I'm sorry but a am not sure that I understand your question, anyhow in my opinion the superlements would be able to create for both connection to other superelements (and/or un-reduced mesh) as well as to a connection to other external system.
For example, for the first case I would like to create a superelement of each rod and then connected them toghedar to get the assembly of a car suspension. Or in the second case I would like to create a superelement of a flexible structure (e.g. a screw connected to motor) and then load the superelement in Simulink to implement the PID control of the motor.
Please tell me if you have further questions. I will be happy to help development staff to improve MATLAB performances.

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