Synthesis of feedback control systems by gain-contour and root-contour methods

The root-locus method for synthesis of servo systems is modified and extended to cover systems having adjustable time constants. Root-locus and gain-contour methods permit studies of effects upon transient response resulting from variations in gain and variations in time constants to be made independently. The root-contour method facilitates the synthesis of servo systems in which gain is a function of a time constant. Methods for development of gain-contour and root-contour equations for basic servo systems are presented. Feedback charts and illustrative examples are included.