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!
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!
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 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.
Got it! Thanks for all=EF=BC=81
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