Lateral-Directional HQ Criteria

Due to the importance of the flight at HAOA, lateral-directional (LD) criteria are also used [8].

10.4.2.1 Lower-Order Equivalent TF

LOTFs are computed as follows [21,22]:

f(s) Ke—TS ; Ke—TS ;

8a(s) s(s + 1fTRy 8r(s) s2 + 2Zd(Bds + w2d ’

f(s) _ LSa(s2 + 2£фШфs + vf)e—;

8a(s) (s ± 1fTs)(s + 1fTr)(s2 + 2Zd(Bds + (B2d) ’

b(s) Nda(s + 1/Tp1)(s + 1/Tp2)(s + 1/Tb3)e—Ts

8r(s) (s ± 1fTs)(s + 1fTr)(s2 + 2ZdBds + uj)

The values of the gains and time delay could be different for each TF. Poles and zeros of the open loop TF are computed. The roll angle and sideslip TF could be fitted independently to the given HODS frequency responses. From the LOTF model several modal characteristics are computed and are dealt with in the description of other criteria [6,8].