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Thanks Nicolas, your info is helpful. I'll have a look into those methods.

Looking at the data sheets for the Bruel & Kjaer 2635 it seems that as you say, it wouldn't be adequate. The displacement gain has already rolled off significantly at 1 hz. I should explain that I've also been asked to measure lateral movement (~2 Hz) and vertical bounce (~1 hz) of the wagon...

I'm new to vibration analysis and I'm interested in measuring the dynamics of a rail vehicle. I'm proposing to use a fibre optic gyroscope to measure roll acceleration (of approx 1 hz), but I need to be able to calculate roll displacement. I understand the usual method is to integrate...