Can the "base excitation" module be controlled to achieve the specified displacement in transient analysis?

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Dear Forum:

Specifically, I used a two-dimensional symmetrical fluid structure coupling module. Due to the strong nonlinearity of the structure, I attempted to use resonant transient analysis for multiple periods.

I derived the sine displacement function twice from t and used it as the acceleration of the fixed direction base vibration. However, the calculated displacement of the base, expressed as solid.u_maseZ, shows a curve of increasing sine function plus linear function.

After searching, the help documentation for the "base excitation" module shows that its acceleration, velocity, and displacement are all relative to a fixed coordinate system. How to make the base displacement become a sine curve with only acceleration input? What is the relationship between the incentive application of "base excitation" and fixed boundary conditions?


1 Reply Last Post Sep 3, 2024, 8:19 a.m. EDT
Acculution ApS Certified Consultant

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Posted: 2 months ago Sep 3, 2024, 8:19 a.m. EDT

Maybe there is some inspiration to find in the description of frames in comsol https://doc.comsol.com/5.5/doc/com.comsol.help.comsol/comsol_ref_deformedmeshes.25.05.html

-------------------
René Christensen, PhD
Acculution ApS
www.acculution.com
info@acculution.com
Maybe there is some inspiration to find in the description of frames in comsol https://doc.comsol.com/5.5/doc/com.comsol.help.comsol/comsol_ref_deformedmeshes.25.05.html

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