discrete-time FOPD too slow in OS4, IRID s*s^-0.0115 tustin

[cnpcshangbo]

FOPD curve is numerical simulation.

[cnpcshangbo]

It is worse than IOPID. try matched.

[cnpcshangbo]

• gam=1-0.9885;

• gam=0.9885-1;