On Wed, 08 Jul 2009 17:25:19 +0800, Bruce Varley wrote:
On the other hand, if you're working on a product in a lab then getting a
frequency response sweep is often quite easy. Usually just a few sweeps
will do to get your initial data, although you'll find yourself doing
multiple sweeps as details change. If you have a resonance then either
do the entire sweep with a very small frequency step, or do a sweep right
around the resonance to pick up the detail.
But Bruce is correct -- doing a frequency sweep on an entire oil refinery
is a bit of a stretch, particularly when you're using expensive raw
ingredients to produce out-of-spec crap that has to be thrown away as
hazardous waste. Ditto for same on a new jet airliner.
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