Abstract
Among the several graphical means being used in the frequency domain, Bode diagrams and Nichols charts are often adopted. Bode's straight-line approximation to a log-magnitude curve is popular because of its simplicity; the correspondingly simple approximation for phase angle has a couple of versions, among which Vogt and Younis' approach is quite elegant. However, there are no straight-line approximations on the Nichols chart, although the chart is so important in designing a control system. This note is to offer a procedure to do the approximation. The result, after routine corrections, is more accurate than that obtained by Bode's diagram. It is, therefore, quite useful in synthesis.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
