Relay feedback tuning of robust PID controllers with iso-damping property Chen Y.
A new tuning method for PID controller design is proposed for a class of unknown, stable, and minimum phase plants We are able to design a PID controller to ensure that the phase Bode plot is flat, ie, the phase derivative wrt the frequency is zero, at a given frequency called the "tangent frequency" so that the closed-loop system is robust to gain variations and the step responses exhibit an iso-damping property
Robust PID controller autotuning with a phase shaper Chen Y.
In our previous work (Chen et al, 2003a), a robust PID autotuning method was proposed by using the idea of "flat phase", ie, the phase derivative wrt the frequency is zero at a given frequency called the "tangent frequency" so that the closed-loop system is robust to gain variations and the step responses exhibit an iso-damping property
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