— Function File: ord2 (nfreq, damp, gain)

Creates a continuous 2nd order system with parameters:

Inputs

nfreq

natural frequency [Hz]. (not in rad/s)

damp

damping coefficient

gain

dc-gain This is steady state value only for damp > 0. gain is assumed to be 1.0 if omitted.

Output

outsys

system data structure has representation with w = 2 * pi * nfreq:

               /                                        \
               | / -2w*damp -w \  / w \                 |
               G = | |             |, |   |, [ 0  gain ], 0 |
               | \   w       0 /  \ 0 /                 |
               \                                        /

See also jet707 (MIMO example, Boeing 707-321 aircraft model)