CODAS

CODAS for Windows is a highly integrated software package for the design and simulation of control systems. CODAS provides time-domain, frequency domain and s-plane environments for the study of linear continuous time systems. Discrete time systems are handled too by defining transfer functions in terms of the z-operator. Non-linearities can be defined interactively with the effects on the system time response being simulated and its describing functions plotted in the frequency domain.
 
CODAS of Windows features: Automated lead/lag compensator design, Automated pole-placement and optimisation, Wide range of mappings, rectangular rule, bi-linear transformers, z-transformers, Polynomial simplification tools, Disturbance (load) inputs and measurement noise.
 
Transfer functions are entered using the built-in editor with systems described in pole-zero form or as polynomials or as both. The transient response of the open or closed loop system can be drawn with both the control effort and plant output displayed on-screen. Root loci are produced using an efficient branch following method. The frequency responses of the open and closed loop system are available in Nyquist form, Nichols plt or as bode gain and phase curves. Closed loop gain contours (M-Contours) are drawn.
 
A demo version of this software can be found below.