Discussion Forum

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?