I am trying to simulate a bump test on an electronic enclosure. I have been given the shape of the pulse (half sine), the peak acceleration and the pulse duration. So I think the most likely study will be a linear dynamic modal time history analysis. I have also been given the number of bumps (around 4000) and that the repetition rate will be 1 to 3 bumps per second. My question is how do I incorporate the number of bumps and the repetition rate in the study?
The only thing I can think of is to plot a very long graph on excel showing each pulse and copy and paste it into the uniform base excitation curve and then run the study. But that would take a lot of computing time and space. Is there a better way to do it?
Atif,
I would try simulating one bump. The reason that people choose to do 1 to 3 bumps per second is that they want it done in a reasonably short period of time and they don't believe that the system is going to move in such a way that the bumps interact with one another. If you run your simulation for a total time of a few times the bump period and everything is damping out quickly, then you are pretty sure that the assumptions were correct. Of course, this all assumes that you have a good handle on the damping in your system, which is often not true.
Jerry S.