Acceleration

[valib]

Dear all,

I need your support. I am a beginner, and I use Ansys.
I have to excite a structure in its support with a crash signal in a transient analysis, and extract the response in a certain node. The crash signal is a measured acceleration in structure supports with a specific frequency. Because the structure is prestressed before excitation, and there are already displacement constraints into the model, I need this excitation as displacement vs time.
I would like to know how I could obtain displacement vs time excitation from the crash signal to get the same acceleration in supports after analysis.
I know that it is possible to extract directly the acceleration after transient analysis (msup or full), but I could not. Is somebody uses it? Can somebody give me a hint?
Thanks!

 

[EricZhao]

First do an inverse Fourier transform. This bring the signal to time domain. Then integrate the signal over time twice, which will change the acceleration to displacement.

 

[valib]

Hello Eric,

I will try that.
Thanks for your support.