Vibration Fatigue Testing
Vibration Fatigue Testing
(OP)
I'm getting ready to send a part out for vibration fatigue testing, but I've never done this before and I'm a little unsure how to set the parameters. The part is being mounted on an engine and I've already run a test and collected vibration data for the mounting location. Now from that, how exactly do I go about scaling the data to simulate the lifetime fatigue from the vibration? Is there a way to scale the PSD? Do I take an FFT and just increase the amplitude? I'm a little unclear of how to do this, so any help is greatly appreciated!





RE: Vibration Fatigue Testing
if you're looking for finite life, i'd use a rainflow algorithim to reduce your measured spectrum to a manageable bunch of max/min cycles; use miner's rule to determine the damage accumulated in your test ... sum(n/N); then the life = (test duration)/sum(n/N)
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