A Campbell diagram, also known as a Campbell plot, is a graphical representation used primarily in the field of vibration analysis and rotating machinery diagnostics. It is named after the engineer who developed it, D. Campbell. The diagram displays the relationship between the frequency of vibration and the rotational frequency of a machine, allowing engineers and analysts to visualize how vibration frequencies change in relation to the speed of the rotating equipment, such as turbines, engines, or pumps.
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