Before revision: Iso-damping is a desirable system property refering to a state, where the phase Bode plot is flat, i.e., the phase derivative with respect to the frequency is zero, at a given frequency called the "tangent frequency" , .
After revision: open-loopIso-damping is a desirable system property refering to a state, where the phase Bode plot is flat, i.e., the phase derivative with respect to the frequency is zero, at a given frequency called the "tangent frequency" , .