A method is shown for the design of series compensators for type 1 and type 0 control systems. It is based on the use of the contour of constant closed loop phase angle, α = - 90°, and assumes second order response specifications such as closed loop relative damping. The compensator parameters are determined from the intersection point of the open loop frequency response locus and a design curve which originates at a design point. The method yields directly an equivalent second order model which may be used to approximate the transient response of the compensated closed loop system.
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References
1.
Raven, F.H.Automatic control engineering, 2nd ed, McGraw-Hill, New York, 1968, pp 316-335.
2.
Hind, E.C. 'Closed loop transient response from the open loop frequency response ', Measurement and Control, August 1978, 11, 302-308.
3.
Hind, E.C. 'Gain settings for specified time responses', Measurement and Control, December 1978, 11, 461-468.
