Engine vibration units
I'm going through some reports related to the FDR on a BAe-146.
There's a parameter for engine vibration - fine. It measures it in inches per second, with test points at 0 and 2 in/sec.
Can anybody explain that to me? I'm used to vibration being expressed in terms of frequency, amplitude and damping ratio. Distance over time doesn't make a lot of sense to me.
G