Is the bode plot easy to get ?

In practice, is the bode plot easy to get? How many experiments have to be conducted in most cases? What if a resonant frequency exist in
the actual plants?
Thanks in advance!
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I can only speak for process plants, but there the answer is *no*. For all sorts of reasons, some technical, some organisational.
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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.
--
http://www.wescottdesign.com

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Got it! Thanks for all!
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