Page 41 - Shock and Vibration Overview
P. 41
Analysis Overview
at some data captured by a Slam Stick X when it was being excited with these vibration
levels; all this data is available to download.
Figure 23: Raw acceleration data from Slam Stick when exposed to random jet aircraft cargo
vibration levels.
Obviously the raw data in the time domain doesn’t tell us much although the amplitude
of the vibration in the time domain of nearly 20g is surprising. Let’s compute both FFTs
and PSDs of these signals to see how the signal length affects the amplitude for the FFT
but not the PSD.
41 of 69
