Hello all,

I am working on an analysis of a large chassis frame for an autonomous vehicle. We are validating the performance capabilities of the system using vehicle-mounted accelerometers. The raw data that we are collecting is filled with intermittent high-amplitude noise, most likely due to vibrations when the vehicle drives over rough patches in the concrete floor. This system follows a motion command array, but the system's true performance capabilities are not currently known.

The intention is to take the collected data, and feed it into static load cases for an FEA study. The current plan is to filter the data to remove "non-commanded" motion, and then use the peak filtered results for the static analysis. My question is this: how do I interpret the high-frequency vibrations in terms of structural analysis? In another way, at what frequency can dynamic loading be modeled as static loading? I am of course not looking for a numerical or concrete answer, but maybe for some guidance from anyone who had similar experience. It seems fair to say that 100Hz frequency components on a structure similar to a truck are not static. The vehicle design and hardware are vibration-tolerant, so I am really just looking at this from a structural standpoint.

Thanks very much