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[jumpei]

Assuming that there are three mass points(called A, B, C), I want to adjust the displacement of B after fixing A (pre-loading),

and then fixing C, and then adjusting the displacement of B again.

How to set this progress?

[SSURA]

Hello Jumpei,
You can approach the problem in many ways, two of the simple ways can be as follows - 

• Setting the boundary conditions and solving the Analysis system, then linking the Solution of System A to the new System B (which has the boundary conditions for 2nd Step you've mentioned above). Something Similar to what we do for a Prestressed Modal Analysis (Prestressed Modal Analysis | Ansys Innovation Courses)
• This can be one of the preferred methods, which is using 'Steps'. From the Analysis Settings, you can define the number of steps needed and then activate or deactivate each boundary accordingly for each step. (Multiple Step Analysis & Project Schematics | Ansys Workbench (simutechgroup.com))
  
  

Hope this helps!

Thanks,

Sahil

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