How can I plot the engine order (EO) lines in a Campbell diagram? If I know the modes, how to plot the forward and backward whirl (FW/BW) modes?

I am working on a simple rotor disc model. I am aware of how to use software plotting. But I need the fundamental theory behind the Campbell diagram and how to plot the engine order lines. Please...

12 September 2020 2,945 1 View