Dr. Abner Mallity has a problem. His graduate students took some
data on a system. While the data (shown below) is extremely noise-free,
he doesn't know the system's transfer function. His graduate students
are still on fall break. Chatting with his Russian chauffeur (Picup
Andropov) on the drive to campus, his chauffeur claims that you don't need
to know the transfer function. He told Mallity "Just plot the Nyquist
plot for the *&^%$#@ thing from the Bode' plot." Here's the Bode'
plot they are chatting about.
This Bode' plot is the plot for G(s) in the diagram below. The vertical axis is in degrees for the phase (dotted blue plot) and the magnitude plot (red line) is in db. In other words,
You need to help out Prof. Mallity. On the plot below, sketch the Nyquist plot for this system (G(s)). Determine the range of gains for which the system is stable.
