Nichols Plot GeneratorDescription| How it works| Gain and Phase Margins
This app will generate the Nichols Plot given a transfer function of the form
F(s) = (a + bs) e-ts / (g + hs).
Nichols plot shows open loop gain in decibels against open loop phase shift. It allows easy determination of robustness margins.
Download.xlsx file (42 KB)
How to useThe use of this app is quite straightforward, simply key in the values of a, b, g, h and t into the cells B6 through B10. Key in the frequency range into the cells B13 and B14. Note that the units of frequency is rad/time. The Nichols plot is generated.
Lets say we wish to obtain the Nichols plot of 2e-3s/(1 + 5s), from 0.01 rad/s to 100 rad/s. We have
a = 2,
b = 0,
h = 5 and
t = 3.
Key in these values and the range. If done correctly, you should see the screen below.
Also See:PID Loop Simulator
Laplace to Time Domain Converter
Nyquist Plot Generator
PI Control of First Order Process
PI Control of Integrating Process