This free, world-class tool has been in development for over 22 years, and is a very robust teaching, learning, and analysis tool. The Student Version, OR Professional Version with Controls Toolbox, is required.
NEW: PZgui now also includes the "Hopkins Demos", a suite of 13 GUI-based demos related to fundamental math and science concepts, including the world's best demo of convolution.
PZgui creates a unified environment to study continuous-time and discrete-time inter-relationships among pole/zero locations, the various frequency-response plots, the root locus, and the various time-domain plots.
The main interface is the Pole/Zero map, from which about 20 other highly integrated and interactive plots can be created, in the continuous-time domain as well as the discrete-time domain. All plots are extensively interactive.
For example, in the zero/pole map (which is the main user-interface), when a pole or zero is dragged-and-dropped to a new location, the associated Bode, Nichols, Nyquist, and time-response plots are updated in real-time as the location is changed. This provides tremendous insight into the effects of poles and zeros in a transfer function.
Nyquist plotting includes the ability to run "Nyquist movies", showing the relationship between the Nyquist contour and the various other frequency-response plots. It easily handles poles and zeros on the stability boundary, automatically "detouring" the Nyquist contour around them.
The continuous-time and discrete-time tools can be "linked" to each other by a choice of ZOH-equivalent or bilinear transformation.
Easily create open-loop Bode plots, closed-loop Bode plots, time-response plots, root-locus plots, Nichols plots, Nyquist and Nyquist-contour plots, and output sensitivity plots. All plots are extraordinarily inter-linked graphically, to enhance understanding of the various relationships among them. All plots can be customized for printing purposes.
Includes special tools for designing and studying pure-gain, lead, lag, and PID controllers.
Includes the ability to specify pure delay (uses 4th-order Pade approximant, where appropriate, in continuous-time domain).
Easily handles models having hundreds of poles and zeros, and can generate generate random high-order (up to 500 poles) models that are typical of flexible structures.
Regularly updated with enhancements and bug-fixes.